#if 0
static const char ident[] = "@(#) $Header: /cvstrac/cvstrac/makeheaders.c,v 1.4 2005/03/16 22:17:51 drh Exp $";
#endif
/*
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
**
** Copyright 1993 D. Richard Hipp. All rights reserved.
**
** Redistribution and use in source and binary forms, with or
** without modification, are permitted provided that the following
** conditions are met:
**
**   1. Redistributions of source code must retain the above copyright
**      notice, this list of conditions and the following disclaimer.
**
**   2. Redistributions in binary form must reproduce the above copyright
**      notice, this list of conditions and the following disclaimer in
**      the documentation and/or other materials provided with the
**      distribution.
**
** This software is provided "as is" and any express or implied warranties,
** including, but not limited to, the implied warranties of merchantability
** and fitness for a particular purpose are disclaimed.  In no event shall
** the author or contributors be liable for any direct, indirect, incidental,
** special, exemplary, or consequential damages (including, but not limited
** to, procurement of substitute goods or services; loss of use, data or
** profits; or business interruption) however caused and on any theory of
** liability, whether in contract, strict liability, or tort (including
** negligence or otherwise) arising in any way out of the use of this
** software, even if advised of the possibility of such damage.
**
** This program is distributed in the hope that it will be useful,
** but without any warranty; without even the implied warranty of
** merchantability or fitness for a particular purpose.
** appropriate header files.
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <memory.h>
#include <sys/stat.h>
#include <assert.h>
#if defined( __MINGW32__) ||  defined(__DMC__) || defined(_MSC_VER) || defined(__POCC__)
#  ifndef WIN32
#    define WIN32
#  endif
# include <string.h>
#else
# include <unistd.h>
#endif

/*
** Macros for debugging.
*/
#ifdef DEBUG
static int debugMask = 0;
# define debug0(F,M)       if( (F)&debugMask ){ fprintf(stderr,M); }
# define debug1(F,M,A)     if( (F)&debugMask ){ fprintf(stderr,M,A); }
# define debug2(F,M,A,B)   if( (F)&debugMask ){ fprintf(stderr,M,A,B); }
# define debug3(F,M,A,B,C) if( (F)&debugMask ){ fprintf(stderr,M,A,B,C); }
# define PARSER      0x00000001
# define DECL_DUMP   0x00000002
# define TOKENIZER   0x00000004
#else
# define debug0(Flags, Format)
# define debug1(Flags, Format, A)
# define debug2(Flags, Format, A, B)
# define debug3(Flags, Format, A, B, C)
#endif

/*
** The following macros are purely for the purpose of testing this
** program on itself.  They don't really contribute to the code.
*/
#define INTERFACE 1
#define EXPORT_INTERFACE 1
#define EXPORT

/*
** Each token in a source file is represented by an instance of
** the following structure.  Tokens are collected onto a list.
*/
typedef struct Token Token;
struct Token {
  const char *zText;      /* The text of the token */
  int nText;              /* Number of characters in the token's text */
  int eType;              /* The type of this token */
  int nLine;              /* The line number on which the token starts */
  Token *pComment;        /* Most recent block comment before this token */
  Token *pNext;           /* Next token on the list */
  Token *pPrev;           /* Previous token on the list */
};

/*
** During tokenization, information about the state of the input
** stream is held in an instance of the following structure
*/
typedef struct InStream InStream;
struct InStream {
  const char *z;          /* Complete text of the input */
  int i;                  /* Next character to read from the input */
  int nLine;              /* The line number for character z[i] */
};

/*
** Each declaration in the C or C++ source files is parsed out and stored as
** an instance of the following structure.
**
** A "forward declaration" is a declaration that an object exists that
** doesn't tell about the objects structure.  A typical forward declaration
** is:
**
**          struct Xyzzy;
**
** Not every object has a forward declaration.  If it does, thought, the
** forward declaration will be contained in the zFwd field for C and
** the zFwdCpp for C++.  The zDecl field contains the complete 
** declaration text.  
*/
typedef struct Decl Decl;
struct Decl {
  char *zName;       /* Name of the object being declared.  The appearance
                     ** of this name is a source file triggers the declaration
                     ** to be added to the header for that file. */
  char *zFile;       /* File from which extracted.  */
  char *zIf;         /* Surround the declaration with this #if */
  char *zFwd;        /* A forward declaration.  NULL if there is none. */
  char *zFwdCpp;     /* Use this forward declaration for C++. */
  char *zDecl;       /* A full declaration of this object */
  char *zExtra;      /* Extra declaration text inserted into class objects */
  int extraType;     /* Last public:, protected: or private: in zExtraDecl */
  struct Include *pInclude;   /* #includes that come before this declaration */
  int flags;         /* See the "Properties" below */
  Token *pComment;   /* A block comment associated with this declaration */
  Token tokenCode;   /* Implementation of functions and procedures */
  Decl *pSameName;   /* Next declaration with the same "zName" */
  Decl *pSameHash;   /* Next declaration with same hash but different zName */
  Decl *pNext;       /* Next declaration with a different name */
};

/*
** Properties associated with declarations.
**
** DP_Forward and DP_Declared are used during the generation of a single
** header file in order to prevent duplicate declarations and definitions.
** DP_Forward is set after the object has been given a forward declaration
** and DP_Declared is set after the object gets a full declarations.
** (Example:  A forward declaration is "typedef struct Abc Abc;" and the
** full declaration is "struct Abc { int a; float b; };".)
**
** The DP_Export and DP_Local flags are more permanent.  They mark objects
** that have EXPORT scope and LOCAL scope respectively.  If both of these
** marks are missing, then the object has library scope.  The meanings of
** the scopes are as follows:
**
**    LOCAL scope         The object is only usable within the file in
**                        which it is declared.
**
**    library scope       The object is visible and usable within other
**                        files in the same project.  By if the project is
**                        a library, then the object is not visible to users
**                        of the library.  (i.e. the object does not appear
**                        in the output when using the -H option.)
**
**    EXPORT scope        The object is visible and usable everywhere.
**
** The DP_Flag is a temporary use flag that is used during processing to
** prevent an infinite loop.  It's use is localized.  
**
** The DP_Cplusplus, DP_ExternCReqd and DP_ExternReqd flags are permanent
** and are used to specify what type of declaration the object requires.
*/
#define DP_Forward      0x001   /* Has a forward declaration in this file */
#define DP_Declared     0x002   /* Has a full declaration in this file */
#define DP_Export       0x004   /* Export this declaration */
#define DP_Local        0x008   /* Declare in its home file only */
#define DP_Flag         0x010   /* Use to mark a subset of a Decl list
                                ** for special processing */
#define DP_Cplusplus    0x020   /* Has C++ linkage and cannot appear in a
                                ** C header file */
#define DP_ExternCReqd  0x040   /* Prepend 'extern "C"' in a C++ header.
                                ** Prepend nothing in a C header */
#define DP_ExternReqd   0x080   /* Prepend 'extern "C"' in a C++ header if
                                ** DP_Cplusplus is not also set. If DP_Cplusplus
                                ** is set or this is a C header then
                                ** prepend 'extern' */

/*
** Convenience macros for dealing with declaration properties
*/
#define DeclHasProperty(D,P)    (((D)->flags&(P))==(P))
#define DeclHasAnyProperty(D,P) (((D)->flags&(P))!=0)
#define DeclSetProperty(D,P)    (D)->flags |= (P)
#define DeclClearProperty(D,P)  (D)->flags &= ~(P)

/*
** These are state properties of the parser.  Each of the values is
** distinct from the DP_ values above so that both can be used in
** the same "flags" field.
**
** Be careful not to confuse PS_Export with DP_Export or
** PS_Local with DP_Local.  Their names are similar, but the meanings
** of these flags are very different.
*/
#define PS_Extern        0x000800    /* "extern" has been seen */
#define PS_Export        0x001000    /* If between "#if EXPORT_INTERFACE" 
                                     ** and "#endif" */
#define PS_Export2       0x002000    /* If "EXPORT" seen */
#define PS_Typedef       0x004000    /* If "typedef" has been seen */
#define PS_Static        0x008000    /* If "static" has been seen */
#define PS_Interface     0x010000    /* If within #if INTERFACE..#endif */
#define PS_Method        0x020000    /* If "::" token has been seen */
#define PS_Local         0x040000    /* If within #if LOCAL_INTERFACE..#endif */
#define PS_Local2        0x080000    /* If "LOCAL" seen. */
#define PS_Public        0x100000    /* If "PUBLIC" seen. */
#define PS_Protected     0x200000    /* If "PROTECTED" seen. */
#define PS_Private       0x400000    /* If "PRIVATE" seen. */
#define PS_PPP           0x700000    /* If any of PUBLIC, PRIVATE, PROTECTED */

/*
** The following set of flags are ORed into the "flags" field of
** a Decl in order to identify what type of object is being
** declared.
*/
#define TY_Class         0x00100000
#define TY_Subroutine    0x00200000
#define TY_Macro         0x00400000
#define TY_Typedef       0x00800000
#define TY_Variable      0x01000000
#define TY_Structure     0x02000000
#define TY_Union         0x04000000
#define TY_Enumeration   0x08000000
#define TY_Defunct       0x10000000  /* Used to erase a declaration */

/*
** Each nested #if (or #ifdef or #ifndef) is stored in a stack of 
** instances of the following structure.
*/
typedef struct Ifmacro Ifmacro;
struct Ifmacro {
  int nLine;         /* Line number where this macro occurs */
  char *zCondition;  /* Text of the condition for this macro */
  Ifmacro *pNext;    /* Next down in the stack */
  int flags;         /* Can hold PS_Export, PS_Interface or PS_Local flags */
};

/*
** When parsing a file, we need to keep track of what other files have
** be #include-ed.  For each #include found, we create an instance of
** the following structure.
*/
typedef struct Include Include;
struct Include {
  char *zFile;       /* The name of file include.  Includes "" or <> */
  char *zIf;         /* If not NULL, #include should be enclosed in #if */
  char *zLabel;      /* A unique label used to test if this #include has
                      * appeared already in a file or not */
  Include *pNext;    /* Previous include file, or NULL if this is the first */
};

/*
** Identifiers found in a source file that might be used later to provoke
** the copying of a declaration into the corresponding header file are
** stored in a hash table as instances of the following structure.
*/
typedef struct Ident Ident;
struct Ident {
  char *zName;        /* The text of this identifier */
  Ident *pCollide;    /* Next identifier with the same hash */
  Ident *pNext;       /* Next identifier in a list of them all */
};

/*
** A complete table of identifiers is stored in an instance of
** the next structure.
*/
#define IDENT_HASH_SIZE 2237
typedef struct IdentTable IdentTable;
struct IdentTable {
  Ident *pList;                     /* List of all identifiers in this table */
  Ident *apTable[IDENT_HASH_SIZE];  /* The hash table */
};

/*
** The following structure holds all information for a single
** source file named on the command line of this program.
*/
typedef struct InFile InFile;
struct InFile {
  char *zSrc;              /* Name of input file */
  char *zHdr;              /* Name of the generated .h file for this input.
                           ** Will be NULL if input is to be scanned only */
  int flags;               /* One or more DP_, PS_ and/or TY_ flags */
  InFile *pNext;           /* Next input file in the list of them all */
  IdentTable idTable;      /* All identifiers in this input file */
};

/* 
** An unbounded string is able to grow without limit.  We use these
** to construct large in-memory strings from lots of smaller components.
*/
typedef struct String String;
struct String {
  int nAlloc;      /* Number of bytes allocated */
  int nUsed;       /* Number of bytes used (not counting null terminator) */
  char *zText;     /* Text of the string */
};

/*
** The following structure contains a lot of state information used
** while generating a .h file.  We put the information in this structure
** and pass around a pointer to this structure, rather than pass around
** all of the information separately.  This helps reduce the number of
** arguments to generator functions.
*/
typedef struct GenState GenState;
struct GenState {
  String *pStr;          /* Write output to this string */
  IdentTable *pTable;    /* A table holding the zLabel of every #include that
                          * has already been generated.  Used to avoid
                          * generating duplicate #includes. */
  const char *zIf;       /* If not NULL, then we are within a #if with
                          * this argument. */
  int nErr;              /* Number of errors */
  const char *zFilename; /* Name of the source file being scanned */
  int flags;             /* Various flags (DP_ and PS_ flags above) */
};

/*
** The following text line appears at the top of every file generated
** by this program.  By recognizing this line, the program can be sure
** never to read a file that it generated itself.
*/
const char zTopLine[] = 
  "/* \aThis file was automatically generated.  Do not edit! */\n";
#define nTopLine (sizeof(zTopLine)-1)

/*
** The name of the file currently being parsed.
*/
static char *zFilename;

/*
** The stack of #if macros for the file currently being parsed.
*/
static Ifmacro *ifStack = 0;

/*
** A list of all files that have been #included so far in a file being
** parsed.
*/
static Include *includeList = 0;

/*
** The last block comment seen.
*/
static Token *blockComment = 0;

/*
** The following flag is set if the -doc flag appears on the
** command line.
*/
static int doc_flag = 0;

/*
** If the following flag is set, then makeheaders will attempt to
** generate prototypes for static functions and procedures.
*/
static int proto_static = 0;

/*
** A list of all declarations.  The list is held together using the
** pNext field of the Decl structure.
*/
static Decl *pDeclFirst;    /* First on the list */
static Decl *pDeclLast;     /* Last on the list */

/*
** A hash table of all declarations
*/
#define DECL_HASH_SIZE 3371
static Decl *apTable[DECL_HASH_SIZE];

/*
** The TEST macro must be defined to something.  Make sure this is the
** case.
*/
#ifndef TEST
# define TEST 0
#endif

#ifdef NOT_USED
/*
** We do our own assertion macro so that we can have more control
** over debugging.
*/
#define Assert(X)    if(!(X)){ CantHappen(__LINE__); }
#define CANT_HAPPEN  CantHappen(__LINE__)
static void CantHappen(int iLine){
  fprintf(stderr,"Assertion failed on line %d\n",iLine);
  *(char*)1 = 0;  /* Force a core-dump */
}
#endif

/*
** Memory allocation functions that are guaranteed never to return NULL.
*/
static void *SafeMalloc(int nByte){
  void *p = malloc( nByte );
  if( p==0 ){
    fprintf(stderr,"Out of memory.  Can't allocate %d bytes.\n",nByte);
    exit(1);
  }
  return p;
}
static void SafeFree(void *pOld){
  if( pOld ){
    free(pOld);
  }
}
static void *SafeRealloc(void *pOld, int nByte){
  void *p;
  if( pOld==0 ){
    p = SafeMalloc(nByte);
  }else{
    p = realloc(pOld, nByte);
    if( p==0 ){
      fprintf(stderr,
        "Out of memory.  Can't enlarge an allocation to %d bytes\n",nByte);
      exit(1);
    }
  }
  return p;
}
static char *StrDup(const char *zSrc, int nByte){
  char *zDest;
  if( nByte<=0 ){
    nByte = strlen(zSrc);
  }
  zDest = SafeMalloc( nByte + 1 );
  strncpy(zDest,zSrc,nByte);
  zDest[nByte] = 0;
  return zDest;
}

/*
** Return TRUE if the character X can be part of an identifier
*/
#define ISALNUM(X)  ((X)=='_' || isalnum(X))

/*
** Routines for dealing with unbounded strings.
*/
static void StringInit(String *pStr){
  pStr->nAlloc = 0;
  pStr->nUsed = 0;
  pStr->zText = 0;
}
static void StringReset(String *pStr){
  SafeFree(pStr->zText);
  StringInit(pStr);
}
static void StringAppend(String *pStr, const char *zText, int nByte){
  if( nByte<=0 ){
    nByte = strlen(zText);
  }
  if( pStr->nUsed + nByte >= pStr->nAlloc ){
    if( pStr->nAlloc==0 ){
      pStr->nAlloc = nByte + 100;
      pStr->zText = SafeMalloc( pStr->nAlloc );
    }else{
      pStr->nAlloc = pStr->nAlloc*2 + nByte;
      pStr->zText = SafeRealloc(pStr->zText, pStr->nAlloc);
    }
  }
  strncpy(&pStr->zText[pStr->nUsed],zText,nByte);
  pStr->nUsed += nByte;
  pStr->zText[pStr->nUsed] = 0;
}
#define StringGet(S) ((S)->zText?(S)->zText:"")

/*
** Compute a hash on a string.  The number returned is a non-negative
** value between 0 and 2**31 - 1
*/
static int Hash(const char *z, int n){
  int h = 0;
  if( n<=0 ){
    n = strlen(z);
  }
  while( n-- ){
    h = h ^ (h<<5) ^ *z++;
  }
  return h & 0x7fffffff;
}

/*
** Given an identifier name, try to find a declaration for that
** identifier in the hash table.  If found, return a pointer to
** the Decl structure.  If not found, return 0.
*/
static Decl *FindDecl(const char *zName, int len){
  int h;
  Decl *p;

  if( len<=0 ){
    len = strlen(zName);
  }
  h = Hash(zName,len) % DECL_HASH_SIZE;
  p = apTable[h];
  while( p && (strncmp(p->zName,zName,len)!=0 || p->zName[len]!=0) ){
    p = p->pSameHash;
  }
  return p;
}

/*
** Install the given declaration both in the hash table and on
** the list of all declarations.
*/
static void InstallDecl(Decl *pDecl){
  int h;
  Decl *pOther;

  h = Hash(pDecl->zName,0) % DECL_HASH_SIZE;
  pOther = apTable[h];
  while( pOther && strcmp(pDecl->zName,pOther->zName)!=0 ){
    pOther = pOther->pSameHash;
  }
  if( pOther ){
    pDecl->pSameName = pOther->pSameName;
    pOther->pSameName = pDecl;
  }else{
    pDecl->pSameName = 0;
    pDecl->pSameHash = apTable[h];
    apTable[h] = pDecl;
  }
  pDecl->pNext = 0;
  if( pDeclFirst==0 ){
    pDeclFirst = pDeclLast = pDecl;
  }else{
    pDeclLast->pNext = pDecl;
    pDeclLast = pDecl;
  }
}

/*
** Look at the current ifStack.  If anything declared at the current
** position must be surrounded with
**
**      #if   STUFF
**      #endif
**
** Then this routine computes STUFF and returns a pointer to it.  Memory
** to hold the value returned is obtained from malloc().
*/
static char *GetIfString(void){
  Ifmacro *pIf;
  char *zResult = 0;
  int hasIf = 0;
  String str;

  for(pIf = ifStack; pIf; pIf=pIf->pNext){
    if( pIf->zCondition==0 || *pIf->zCondition==0 ) continue;
    if( !hasIf ){
      hasIf = 1;
      StringInit(&str);
    }else{
      StringAppend(&str," && ",4);
    }
    StringAppend(&str,pIf->zCondition,0);
  }
  if( hasIf ){
    zResult = StrDup(StringGet(&str),0);
    StringReset(&str);
  }else{
    zResult = 0;
  }
  return zResult;
}

/*
** Create a new declaration and put it in the hash table.  Also
** return a pointer to it so that we can fill in the zFwd and zDecl
** fields, and so forth.
*/
static Decl *CreateDecl(
  const char *zName,       /* Name of the object being declared. */
  int nName                /* Length of the name */
){
  Decl *pDecl;

  pDecl = SafeMalloc( sizeof(Decl) + nName + 1);
  memset(pDecl,0,sizeof(Decl));
  pDecl->zName = (char*)&pDecl[1];
  sprintf(pDecl->zName,"%.*s",nName,zName);
  pDecl->zFile = zFilename;
  pDecl->pInclude = includeList;
  pDecl->zIf = GetIfString();
  InstallDecl(pDecl);
  return pDecl;
}

/*
** Insert a new identifier into an table of identifiers.  Return TRUE if
** a new identifier was inserted and return FALSE if the identifier was
** already in the table.
*/
static int IdentTableInsert(
  IdentTable *pTable,       /* The table into which we will insert */
  const char *zId,          /* Name of the identifiers */
  int nId                   /* Length of the identifier name */
){
  int h;
  Ident *pId;

  if( nId<=0 ){
    nId = strlen(zId);
  }
  h = Hash(zId,nId) % IDENT_HASH_SIZE;
  for(pId = pTable->apTable[h]; pId; pId=pId->pCollide){
    if( strncmp(zId,pId->zName,nId)==0 && pId->zName[nId]==0 ){
      /* printf("Already in table: %.*s\n",nId,zId); */
      return 0;
    }
  }
  pId = SafeMalloc( sizeof(Ident) + nId + 1 );
  pId->zName = (char*)&pId[1];
  sprintf(pId->zName,"%.*s",nId,zId);
  pId->pNext = pTable->pList;
  pTable->pList = pId;
  pId->pCollide = pTable->apTable[h];
  pTable->apTable[h] = pId;
  /* printf("Add to table: %.*s\n",nId,zId); */
  return 1;
}

/*
** Check to see if the given value is in the given IdentTable.  Return
** true if it is and false if it is not.
*/
static int IdentTableTest(
  IdentTable *pTable,       /* The table in which to search */
  const char *zId,          /* Name of the identifiers */
  int nId                   /* Length of the identifier name */
){
  int h;
  Ident *pId;

  if( nId<=0 ){
    nId = strlen(zId);
  }
  h = Hash(zId,nId) % IDENT_HASH_SIZE;
  for(pId = pTable->apTable[h]; pId; pId=pId->pCollide){
    if( strncmp(zId,pId->zName,nId)==0 && pId->zName[nId]==0 ){
      return 1;
    }
  }
  return 0;
}

/*
** Remove every identifier from the given table.   Reset the table to
** its initial state.
*/
static void IdentTableReset(IdentTable *pTable){
  Ident *pId, *pNext;

  for(pId = pTable->pList; pId; pId = pNext){
    pNext = pId->pNext;
    SafeFree(pId);
  }
  memset(pTable,0,sizeof(IdentTable));
}

#ifdef DEBUG
/*
** Print the name of every identifier in the given table, one per line
*/
static void IdentTablePrint(IdentTable *pTable, FILE *pOut){
  Ident *pId;

  for(pId = pTable->pList; pId; pId = pId->pNext){
    fprintf(pOut,"%s\n",pId->zName);
  }
}
#endif

/*
** Read an entire file into memory.  Return a pointer to the memory.
**
** The memory is obtained from SafeMalloc and must be freed by the
** calling function.
**
** If the read fails for any reason, 0 is returned.
*/
static char *ReadFile(const char *zFilename){
  struct stat sStat;
  FILE *pIn;
  char *zBuf;
  int n;

  if( stat(zFilename,&sStat)!=0 
#ifndef WIN32
    || !S_ISREG(sStat.st_mode)
#endif
  ){
    return 0;
  }
  pIn = fopen(zFilename,"r");
  if( pIn==0 ){
    return 0;
  }
  zBuf = SafeMalloc( sStat.st_size + 1 );
  n = fread(zBuf,1,sStat.st_size,pIn);
  zBuf[n] = 0;
  fclose(pIn);
  return zBuf;
}

/*
** Write the contents of a string into a file.  Return the number of
** errors
*/
static int WriteFile(const char *zFilename, const char *zOutput){
  FILE *pOut;
  pOut = fopen(zFilename,"w");
  if( pOut==0 ){
    return 1;
  }
  fwrite(zOutput,1,strlen(zOutput),pOut);
  fclose(pOut);
  return 0;
}

/*
** Major token types
*/
#define TT_Space           1   /* Contiguous white space */
#define TT_Id              2   /* An identifier */
#define TT_Preprocessor    3   /* Any C preprocessor directive */
#define TT_Comment         4   /* Either C or C++ style comment */
#define TT_Number          5   /* Any numeric constant */
#define TT_String          6   /* String or character constants. ".." or '.' */
#define TT_Braces          7   /* All text between { and a matching } */
#define TT_EOF             8   /* End of file */
#define TT_Error           9   /* An error condition */
#define TT_BlockComment    10  /* A C-Style comment at the left margin that
                                * spans multple lines */
#define TT_Other           0   /* None of the above */

/*
** Get a single low-level token from the input file.  Update the
** file pointer so that it points to the first character beyond the
** token.
**
** A "low-level token" is any token except TT_Braces.  A TT_Braces token
** consists of many smaller tokens and is assembled by a routine that
** calls this one.
**
** The function returns the number of errors.  An error is an
** unterminated string or character literal or an unterminated
** comment.
**
** Profiling shows that this routine consumes about half the
** CPU time on a typical run of makeheaders.
*/
static int GetToken(InStream *pIn, Token *pToken){
  int i;
  const char *z;
  int cStart;
  int c;
  int startLine;   /* Line on which a structure begins */
  int nlisc = 0;   /* True if there is a new-line in a ".." or '..' */
  int nErr = 0;    /* Number of errors seen */

  z = pIn->z;
  i = pIn->i;
  pToken->nLine = pIn->nLine;
  pToken->zText = &z[i];
  switch( z[i] ){
    case 0:
      pToken->eType = TT_EOF;
      pToken->nText = 0;
      break;

    case '#':
      if( i==0 || z[i-1]=='\n' || (i>1 && z[i-1]=='\r' && z[i-2]=='\n')){
        /* We found a preprocessor statement */
        pToken->eType = TT_Preprocessor;
        i++;
        while( z[i]!=0 && z[i]!='\n' ){
          if( z[i]=='\\' ){
            i++;
            if( z[i]=='\n' ) pIn->nLine++;
          }
          i++;
        }
        pToken->nText = i - pIn->i;
      }else{
        /* Just an operator */
        pToken->eType = TT_Other;
        pToken->nText = 1;
      }
      break;

    case ' ':
    case '\t':
    case '\r':
    case '\f':
    case '\n':
      while( isspace(z[i]) ){
        if( z[i]=='\n' ) pIn->nLine++;
        i++;
      }
      pToken->eType = TT_Space;
      pToken->nText = i - pIn->i;
      break;

    case '\\':
      pToken->nText = 2;
      pToken->eType = TT_Other;
      if( z[i+1]=='\n' ){
        pIn->nLine++;
        pToken->eType = TT_Space;
      }else if( z[i+1]==0 ){
        pToken->nText = 1;
      }
      break;

    case '\'':
    case '\"':
      cStart = z[i];
      startLine = pIn->nLine;
      do{
        i++;
        c = z[i];
        if( c=='\n' ){
          if( !nlisc ){
            fprintf(stderr,
              "%s:%d: (warning) Newline in string or character literal.\n",
              zFilename, pIn->nLine);
            nlisc = 1;
          }
          pIn->nLine++;
        }
        if( c=='\\' ){
          i++;
          c = z[i];
          if( c=='\n' ){
            pIn->nLine++;
          }
        }else if( c==cStart ){
          i++;
          c = 0;
        }else if( c==0 ){
          fprintf(stderr, "%s:%d: Unterminated string or character literal.\n",
             zFilename, startLine);
          nErr++;
        }
      }while( c );
      pToken->eType = TT_String;
      pToken->nText = i - pIn->i;
      break;

    case '/':
      if( z[i+1]=='/' ){
        /* C++ style comment */
        while( z[i] && z[i]!='\n' ){ i++; }
        pToken->eType = TT_Comment;
        pToken->nText = i - pIn->i;
      }else if( z[i+1]=='*' ){
        /* C style comment */
        int isBlockComment = i==0 || z[i-1]=='\n';
        i += 2;
        startLine = pIn->nLine;
        while( z[i] && (z[i]!='*' || z[i+1]!='/') ){
          if( z[i]=='\n' ){
            pIn->nLine++;
            if( isBlockComment ){
              if( z[i+1]=='*' || z[i+2]=='*' ){
                 isBlockComment = 2;
              }else{
                 isBlockComment = 0;
              }
            }
          }
          i++;
        }
        if( z[i] ){ 
          i += 2; 
        }else{
          isBlockComment = 0;
          fprintf(stderr,"%s:%d: Unterminated comment\n",
            zFilename, startLine);
          nErr++;
        }
        pToken->eType = isBlockComment==2 ? TT_BlockComment : TT_Comment;
        pToken->nText = i - pIn->i;
      }else{
        /* A divide operator */
        pToken->eType = TT_Other;
        pToken->nText = 1 + (z[i+1]=='+');
      }
      break;

    case '0': 
      if( z[i+1]=='x' || z[i+1]=='X' ){
        /* A hex constant */
        i += 2;
        while( isxdigit(z[i]) ){ i++; }
      }else{
        /* An octal constant */
        while( isdigit(z[i]) ){ i++; }
      }
      pToken->eType = TT_Number;
      pToken->nText = i - pIn->i;
      break;

    case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9':
      while( isdigit(z[i]) ){ i++; }
      if( (c=z[i])=='.' ){
         i++;
         while( isdigit(z[i]) ){ i++; }
         c = z[i];
         if( c=='e' || c=='E' ){
           i++;
           if( ((c=z[i])=='+' || c=='-') && isdigit(z[i+1]) ){ i++; }
           while( isdigit(z[i]) ){ i++; }
           c = z[i];
         }
         if( c=='f' || c=='F' || c=='l' || c=='L' ){ i++; }
      }else if( c=='e' || c=='E' ){
         i++;
         if( ((c=z[i])=='+' || c=='-') && isdigit(z[i+1]) ){ i++; }
         while( isdigit(z[i]) ){ i++; }
      }else if( c=='L' || c=='l' ){
         i++;
         c = z[i];
         if( c=='u' || c=='U' ){ i++; }
      }else if( c=='u' || c=='U' ){
         i++;
         c = z[i];
         if( c=='l' || c=='L' ){ i++; }
      }
      pToken->eType = TT_Number;
      pToken->nText = i - pIn->i;
      break;

    case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g':
    case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
    case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u':
    case 'v': case 'w': case 'x': case 'y': case 'z': case 'A': case 'B':
    case 'C': case 'D': case 'E': case 'F': case 'G': case 'H': case 'I':
    case 'J': case 'K': case 'L': case 'M': case 'N': case 'O': case 'P':
    case 'Q': case 'R': case 'S': case 'T': case 'U': case 'V': case 'W':
    case 'X': case 'Y': case 'Z': case '_':
      while( isalnum(z[i]) || z[i]=='_' ){ i++; };
      pToken->eType = TT_Id;
      pToken->nText = i - pIn->i;
      break;

    case ':': 
      pToken->eType = TT_Other;
      pToken->nText = 1 + (z[i+1]==':');
      break;

    case '=':
    case '<':
    case '>':
    case '+':
    case '-':
    case '*':
    case '%':
    case '^':
    case '&':
    case '|': 
      pToken->eType = TT_Other;
      pToken->nText = 1 + (z[i+1]=='=');
      break;

    default:
      pToken->eType = TT_Other;
      pToken->nText = 1;
      break;
  }
  pIn->i += pToken->nText;
  return nErr;
}

/*
** This routine recovers the next token from the input file which is
** not a space or a comment or any text between an "#if 0" and "#endif".
**
** This routine returns the number of errors encountered.  An error
** is an unterminated token or unmatched "#if 0".
**
** Profiling shows that this routine uses about a quarter of the
** CPU time in a typical run.
*/
static int GetNonspaceToken(InStream *pIn, Token *pToken){
  int nIf = 0;
  int inZero = 0;
  const char *z;
  int value;
  int startLine;
  int nErr = 0;

  startLine = pIn->nLine;
  while( 1 ){
    nErr += GetToken(pIn,pToken);
    /* printf("%04d: Type=%d nIf=%d [%.*s]\n",
       pToken->nLine,pToken->eType,nIf,pToken->nText,
       pToken->eType!=TT_Space ? pToken->zText : "<space>"); */
    pToken->pComment = blockComment;
    switch( pToken->eType ){
      case TT_Comment:
      case TT_Space:
        break;

      case TT_BlockComment:
        if( doc_flag ){
          blockComment = SafeMalloc( sizeof(Token) );
          *blockComment = *pToken;
        }
        break;

      case TT_EOF:
        if( nIf ){
          fprintf(stderr,"%s:%d: Unterminated \"#if\"\n",
             zFilename, startLine);
          nErr++;
        }
        return nErr;

      case TT_Preprocessor:
        z = &pToken->zText[1];
        while( *z==' ' || *z=='\t' ) z++;
        if( sscanf(z,"if %d",&value)==1 && value==0 ){
          nIf++;
          inZero = 1;
        }else if( inZero ){
          if( strncmp(z,"if",2)==0 ){
            nIf++;
          }else if( strncmp(z,"endif",5)==0 ){
            nIf--;
            if( nIf==0 ) inZero = 0;
          }
        }else{
          return nErr;
        }
        break;

      default:
        if( !inZero ){
          return nErr;
        }
        break;
    }
  }
  /* NOT REACHED */
}

/* 
** This routine looks for identifiers (strings of contiguous alphanumeric
** characters) within a preprocessor directive and adds every such string
** found to the given identifier table
*/
static void FindIdentifiersInMacro(Token *pToken, IdentTable *pTable){
  Token sToken;
  InStream sIn;
  int go = 1;

  sIn.z = pToken->zText;
  sIn.i = 1;
  sIn.nLine = 1;
  while( go && sIn.i < pToken->nText ){
    GetToken(&sIn,&sToken);
    switch( sToken.eType ){
      case TT_Id:
        IdentTableInsert(pTable,sToken.zText,sToken.nText);
        break;

      case TT_EOF:
        go = 0;
        break;

      default:
        break;
    }
  }
}

/*
** This routine gets the next token.  Everything contained within
** {...} is collapsed into a single TT_Braces token.  Whitespace is
** omitted.
**
** If pTable is not NULL, then insert every identifier seen into the
** IdentTable.  This includes any identifiers seen inside of {...}.
**
** The number of errors encountered is returned.  An error is an
** unterminated token.
*/
static int GetBigToken(InStream *pIn, Token *pToken, IdentTable *pTable){
  const char *z, *zStart;
  int iStart;
  int nBrace;
  int c;
  int nLine;
  int nErr;

  nErr = GetNonspaceToken(pIn,pToken);
  switch( pToken->eType ){
    case TT_Id:
      if( pTable!=0 ){
        IdentTableInsert(pTable,pToken->zText,pToken->nText);
      }
      return nErr;

    case TT_Preprocessor:
      if( pTable!=0 ){
        FindIdentifiersInMacro(pToken,pTable);
      }
      return nErr;

    case TT_Other:
      if( pToken->zText[0]=='{' ) break;
      return nErr;

    default:
      return nErr;
  }

  z = pIn->z;
  iStart = pIn->i;
  zStart = pToken->zText;
  nLine = pToken->nLine;
  nBrace = 1;
  while( nBrace ){
    nErr += GetNonspaceToken(pIn,pToken);
    /* printf("%04d: nBrace=%d [%.*s]\n",pToken->nLine,nBrace,
       pToken->nText,pToken->zText); */
    switch( pToken->eType ){
      case TT_EOF:
        fprintf(stderr,"%s:%d: Unterminated \"{\"\n",
           zFilename, nLine);
        nErr++;
        pToken->eType = TT_Error;
        return nErr;

      case TT_Id:
        if( pTable ){
          IdentTableInsert(pTable,pToken->zText,pToken->nText);
        }
        break;
  
      case TT_Preprocessor:
        if( pTable!=0 ){
          FindIdentifiersInMacro(pToken,pTable);
        }
        break;

      case TT_Other:
        if( (c = pToken->zText[0])=='{' ){
          nBrace++;
        }else if( c=='}' ){
          nBrace--;
        }
        break;

      default:
        break;
    }
  }
  pToken->eType = TT_Braces;
  pToken->nText = 1 + pIn->i - iStart;
  pToken->zText = zStart;
  pToken->nLine = nLine;
  return nErr;
}

/*
** This routine frees up a list of Tokens.  The pComment tokens are
** not cleared by this.  So we leak a little memory when using the -doc
** option.  So what.
*/
static void FreeTokenList(Token *pList){
  Token *pNext;
  while( pList ){
    pNext = pList->pNext;
    SafeFree(pList);
    pList = pNext;
  }
}

/*
** Tokenize an entire file.  Return a pointer to the list of tokens.
**
** Space for each token is obtained from a separate malloc() call.  The
** calling function is responsible for freeing this space.
**
** If pTable is not NULL, then fill the table with all identifiers seen in
** the input file.
*/
static Token *TokenizeFile(const char *zFile, IdentTable *pTable){
  InStream sIn;
  Token *pFirst = 0, *pLast = 0, *pNew;
  int nErr = 0;

  sIn.z = zFile;
  sIn.i = 0;
  sIn.nLine = 1;
  blockComment = 0;

  while( sIn.z[sIn.i]!=0 ){
    pNew = SafeMalloc( sizeof(Token) );
    nErr += GetBigToken(&sIn,pNew,pTable);
    debug3(TOKENIZER, "Token on line %d: [%.*s]\n",
       pNew->nLine, pNew->nText<50 ? pNew->nText : 50, pNew->zText);
    if( pFirst==0 ){
      pFirst = pLast = pNew;
      pNew->pPrev = 0;
    }else{
      pLast->pNext = pNew;
      pNew->pPrev = pLast;
      pLast = pNew;
    }
    if( pNew->eType==TT_EOF ) break;
  }
  if( pLast ) pLast->pNext = 0;
  blockComment = 0;
  if( nErr ){
    FreeTokenList(pFirst);
    pFirst = 0;
  }

  return pFirst;
}

#if TEST==1
/*
** Use the following routine to test or debug the tokenizer.
*/
void main(int argc, char **argv){
  char *zFile;
  Token *pList, *p;
  IdentTable sTable;

  if( argc!=2 ){
    fprintf(stderr,"Usage: %s filename\n",*argv);
    exit(1);
  }
  memset(&sTable,0,sizeof(sTable));
  zFile = ReadFile(argv[1]);
  if( zFile==0 ){
    fprintf(stderr,"Can't read file \"%s\"\n",argv[1]);
    exit(1);
  }
  pList = TokenizeFile(zFile,&sTable);
  for(p=pList; p; p=p->pNext){
    int j;
    switch( p->eType ){ 
      case TT_Space:
        printf("%4d: Space\n",p->nLine);
        break;
      case TT_Id:
        printf("%4d: Id           %.*s\n",p->nLine,p->nText,p->zText);
        break;
      case TT_Preprocessor:
        printf("%4d: Preprocessor %.*s\n",p->nLine,p->nText,p->zText);
        break;
      case TT_Comment:
        printf("%4d: Comment\n",p->nLine);
        break;
      case TT_BlockComment:
        printf("%4d: Block Comment\n",p->nLine);
        break;
      case TT_Number:
        printf("%4d: Number       %.*s\n",p->nLine,p->nText,p->zText);
        break;
      case TT_String:
        printf("%4d: String       %.*s\n",p->nLine,p->nText,p->zText);
        break;
      case TT_Other:
        printf("%4d: Other        %.*s\n",p->nLine,p->nText,p->zText);
        break;
      case TT_Braces:
        for(j=0; j<p->nText && j<30 && p->zText[j]!='\n'; j++){}
        printf("%4d: Braces       %.*s...}\n",p->nLine,j,p->zText);
        break;
      case TT_EOF:
        printf("%4d: End of file\n",p->nLine);
        break;
      default:
        printf("%4d: type %d\n",p->nLine,p->eType);
        break;
    }
  }
  FreeTokenList(pList);
  SafeFree(zFile);
  IdentTablePrint(&sTable,stdout);
}
#endif

#ifdef DEBUG
/*
** For debugging purposes, write out a list of tokens.
*/
static void PrintTokens(Token *pFirst, Token *pLast){
  int needSpace = 0;
  int c;

  pLast = pLast->pNext;
  while( pFirst!=pLast ){
    switch( pFirst->eType ){
      case TT_Preprocessor:
        printf("\n%.*s\n",pFirst->nText,pFirst->zText);
        needSpace = 0;
        break;

      case TT_Id:
      case TT_Number:
        printf("%s%.*s", needSpace ? " " : "", pFirst->nText, pFirst->zText);
        needSpace = 1;
        break;

      default:
        c = pFirst->zText[0];
        printf("%s%.*s", 
          (needSpace && (c=='*' || c=='{')) ? " " : "",
          pFirst->nText, pFirst->zText);
        needSpace = pFirst->zText[0]==',';
        break;
    }
    pFirst = pFirst->pNext;
  }
}
#endif

/*
** Convert a sequence of tokens into a string and return a pointer
** to that string.  Space to hold the string is obtained from malloc()
** and must be freed by the calling function.
**
** Certain keywords (EXPORT, PRIVATE, PUBLIC, PROTECTED) are always
** skipped.
**
** If pSkip!=0 then skip over nSkip tokens beginning with pSkip.
**
** If zTerm!=0 then append the text to the end.
*/
static char *TokensToString(
  Token *pFirst,    /* First token in the string */
  Token *pLast,     /* Last token in the string */
  char *zTerm,      /* Terminate the string with this text if not NULL */
  Token *pSkip,     /* Skip this token if not NULL */
  int nSkip         /* Skip a total of this many tokens */
){
  char *zReturn;
  String str;
  int needSpace = 0;
  int c;
  int iSkip = 0;
  int skipOne = 0;

  StringInit(&str);
  pLast = pLast->pNext;
  while( pFirst!=pLast ){
    if( pFirst==pSkip ){ iSkip = nSkip; }
    if( iSkip>0 ){ 
      iSkip--;
      pFirst=pFirst->pNext; 
      continue;
    }
    switch( pFirst->eType ){
      case TT_Preprocessor:
        StringAppend(&str,"\n",1);
        StringAppend(&str,pFirst->zText,pFirst->nText);
        StringAppend(&str,"\n",1);
        needSpace = 0;
        break;

      case TT_Id: 
        switch( pFirst->zText[0] ){
          case 'E':        
            if( pFirst->nText==6 && strncmp(pFirst->zText,"EXPORT",6)==0 ){
              skipOne = 1;
            }
            break;
          case 'P':
            switch( pFirst->nText ){
              case 6:  skipOne = !strncmp(pFirst->zText,"PUBLIC", 6);    break;
              case 7:  skipOne = !strncmp(pFirst->zText,"PRIVATE",7);    break;
              case 9:  skipOne = !strncmp(pFirst->zText,"PROTECTED",9);  break;
              default: break;
            }
            break;
          default:
            break;
        }
        if( skipOne ){
          pFirst = pFirst->pNext;
          continue;
        }
        /* Fall thru to the next case */
      case TT_Number:
        if( needSpace ){
          StringAppend(&str," ",1);
        }
        StringAppend(&str,pFirst->zText,pFirst->nText);
        needSpace = 1;
        break;

      default:
        c = pFirst->zText[0];
        if( needSpace && (c=='*' || c=='{') ){
          StringAppend(&str," ",1);
        }
        StringAppend(&str,pFirst->zText,pFirst->nText);
        /* needSpace = pFirst->zText[0]==','; */
        needSpace = 0;
        break;
    }
    pFirst = pFirst->pNext;
  }
  if( zTerm && *zTerm ){
    StringAppend(&str,zTerm,strlen(zTerm));
  }
  zReturn = StrDup(StringGet(&str),0);
  StringReset(&str);
  return zReturn;
}

/*
** This routine is called when we see one of the keywords "struct",
** "enum", "union" or "class".  This might be the beginning of a
** type declaration.  This routine will process the declaration and
** remove the declaration tokens from the input stream.
**
** If this is a type declaration that is immediately followed by a
** semicolon (in other words it isn't also a variable definition)
** then set *pReset to ';'.  Otherwise leave *pReset at 0.  The
** *pReset flag causes the parser to skip ahead to the next token
** that begins with the value placed in the *pReset flag, if that
** value is different from 0.
*/
static int ProcessTypeDecl(Token *pList, int flags, int *pReset){
  Token *pName, *pEnd;
  Decl *pDecl;
  String str;
  int need_to_collapse = 1;
  int type = 0;

  *pReset = 0;
  if( pList==0 || pList->pNext==0 || pList->pNext->eType!=TT_Id ){
    return 0;
  }
  pName = pList->pNext;

  /* Catch the case of "struct Foo;" and skip it. */
  if( pName->pNext && pName->pNext->zText[0]==';' ){
    *pReset = ';';
    return 0;
  }

  for(pEnd=pName->pNext; pEnd && pEnd->eType!=TT_Braces; pEnd=pEnd->pNext){
    switch( pEnd->zText[0] ){
      case '(':
      case '*':
      case '[':
      case '=':
      case ';':
        return 0;
    }
  }
  if( pEnd==0 ){
    return 0;
  }

  /*
  ** At this point, we know we have a type declaration that is bounded
  ** by pList and pEnd and has the name pName.
  */

  /*
  ** If the braces are followed immedately by a semicolon, then we are
  ** dealing a type declaration only.  There is not variable definition
  ** following the type declaration.  So reset...
  */
  if( pEnd->pNext==0 || pEnd->pNext->zText[0]==';' ){
    *pReset = ';';
    need_to_collapse = 0;
  }else{
    need_to_collapse = 1;
  }

  if( proto_static==0 && (flags & (PS_Local|PS_Export|PS_Interface))==0 ){
    /* Ignore these objects unless they are explicitly declared as interface,
    ** or unless the "-local" command line option was specified. */
    *pReset = ';';
    return 0;
  }

#ifdef DEBUG
  if( debugMask & PARSER ){
    printf("**** Found type: %.*s %.*s...\n",
      pList->nText, pList->zText, pName->nText, pName->zText);
    PrintTokens(pList,pEnd);
    printf(";\n");
  }
#endif

  /*
  ** Create a new Decl object for this definition.  Actually, if this
  ** is a C++ class definition, then the Decl object might already exist,
  ** so check first for that case before creating a new one.
  */
  switch( *pList->zText ){
    case 'c':  type = TY_Class;        break;
    case 's':  type = TY_Structure;    break;
    case 'e':  type = TY_Enumeration;  break;
    case 'u':  type = TY_Union;        break;
    default:   /* Can't Happen */      break;
  }
  if( type!=TY_Class ){
    pDecl = 0;
  }else{
    pDecl = FindDecl(pName->zText, pName->nText);
    if( pDecl && (pDecl->flags & type)!=type ) pDecl = 0;
  }
  if( pDecl==0 ){
    pDecl = CreateDecl(pName->zText,pName->nText);
  }
  if( (flags & PS_Static) || !(flags & (PS_Interface|PS_Export)) ){
    DeclSetProperty(pDecl,DP_Local);
  }
  DeclSetProperty(pDecl,type);

  /* The object has a full declaration only if it is contained within
  ** "#if INTERFACE...#endif" or "#if EXPORT_INTERFACE...#endif" or
  ** "#if LOCAL_INTERFACE...#endif".  Otherwise, we only give it a
  ** forward declaration.
  */
  if( flags & (PS_Local | PS_Export | PS_Interface)  ){
    pDecl->zDecl = TokensToString(pList,pEnd,";\n",0,0);
  }else{
    pDecl->zDecl = 0;
  }
  pDecl->pComment = pList->pComment;
  StringInit(&str);
  StringAppend(&str,"typedef ",0);
  StringAppend(&str,pList->zText,pList->nText);
  StringAppend(&str," ",0);
  StringAppend(&str,pName->zText,pName->nText);
  StringAppend(&str," ",0);
  StringAppend(&str,pName->zText,pName->nText);
  StringAppend(&str,";\n",2);
  pDecl->zFwd = StrDup(StringGet(&str),0);
  StringReset(&str);
  StringInit(&str);
  StringAppend(&str,pList->zText,pList->nText);
  StringAppend(&str," ",0);
  StringAppend(&str,pName->zText,pName->nText);
  StringAppend(&str,";\n",2);
  pDecl->zFwdCpp = StrDup(StringGet(&str),0);
  StringReset(&str);
  if( flags & PS_Export ){
    DeclSetProperty(pDecl,DP_Export);
  }else if( flags & PS_Local ){
    DeclSetProperty(pDecl,DP_Local);
  }

  /* Here's something weird.  ANSI-C doesn't allow a forward declaration
  ** of an enumeration.  So we have to build the typedef into the
  ** definition.
  */
  if( pDecl->zDecl && DeclHasProperty(pDecl, TY_Enumeration) ){
    StringInit(&str);
    StringAppend(&str,pDecl->zDecl,0);
    StringAppend(&str,pDecl->zFwd,0);
    SafeFree(pDecl->zDecl);
    SafeFree(pDecl->zFwd);
    pDecl->zFwd = 0;
    pDecl->zDecl = StrDup(StringGet(&str),0);
    StringReset(&str);
  }

  if( pName->pNext->zText[0]==':' ){
    DeclSetProperty(pDecl,DP_Cplusplus);
  }
  if( pName->nText==5 && strncmp(pName->zText,"class",5)==0 ){
    DeclSetProperty(pDecl,DP_Cplusplus);
  }

  /*
  ** Remove all but pList and pName from the input stream.
  */
  if( need_to_collapse ){
    while( pEnd!=pName ){
      Token *pPrev = pEnd->pPrev;
      pPrev->pNext = pEnd->pNext;
      pEnd->pNext->pPrev = pPrev;
      SafeFree(pEnd);
      pEnd = pPrev;
    }
  }
  return 0;
}

/*
** Given a list of tokens that declare something (a function, procedure,
** variable or typedef) find the token which contains the name of the
** thing being declared.
**
** Algorithm:
**
**   The name is:
**
**     1.  The first identifier that is followed by a "[", or
**
**     2.  The first identifier that is followed by a "(" where the
**         "(" is followed by another identifier, or
**
**     3.  The first identifier followed by "::", or
**
**     4.  If none of the above, then the last identifier.
**
**   In all of the above, certain reserved words (like "char") are
**   not considered identifiers.
*/
static Token *FindDeclName(Token *pFirst, Token *pLast){
  Token *pName = 0;
  Token *p;
  int c;

  if( pFirst==0 || pLast==0 ){
    return 0;
  }
  pLast = pLast->pNext;
  for(p=pFirst; p && p!=pLast; p=p->pNext){
    if( p->eType==TT_Id ){
      static IdentTable sReserved;
      static int isInit = 0;
      static char *aWords[] = { "char", "class", 
       "const", "double", "enum", "extern", "EXPORT", "ET_PROC", 
       "float", "int", "long",
       "PRIVATE", "PROTECTED", "PUBLIC",
       "register", "static", "struct", "sizeof", "signed", "typedef", 
       "union", "volatile", "virtual", "void", };
  
      if( !isInit ){
        int i;
        for(i=0; i<sizeof(aWords)/sizeof(aWords[0]); i++){
          IdentTableInsert(&sReserved,aWords[i],0);
        }
        isInit = 1;
      }
      if( !IdentTableTest(&sReserved,p->zText,p->nText) ){
        pName = p;
      }
    }else if( p==pFirst ){
      continue;
    }else if( (c=p->zText[0])=='[' && pName ){
      break;
    }else if( c=='(' && p->pNext && p->pNext->eType==TT_Id && pName ){
      break;
    }else if( c==':' && p->zText[1]==':' && pName ){
      break;
    }
  }
  return pName;
}

/*
** This routine is called when we see a method for a class that begins
** with the PUBLIC, PRIVATE, or PROTECTED keywords.  Such methods are
** added to their class definitions.
*/
static int ProcessMethodDef(Token *pFirst, Token *pLast, int flags){
  Token *pCode;
  Token *pClass;
  char *zDecl;
  Decl *pDecl;
  String str;
  int type;

  pCode = pLast;
  pLast = pLast->pPrev;
  while( pFirst->zText[0]=='P' ){
    int rc = 1;
    switch( pFirst->nText ){
      case 6:  rc = strncmp(pFirst->zText,"PUBLIC",6); break;
      case 7:  rc = strncmp(pFirst->zText,"PRIVATE",7); break;
      case 9:  rc = strncmp(pFirst->zText,"PROTECTED",9); break;
      default:  break;
    }
    if( rc ) break;
    pFirst = pFirst->pNext;
  }
  pClass = FindDeclName(pFirst,pLast);
  if( pClass==0 ){
    fprintf(stderr,"%s:%d: Unable to find the class name for this method\n",
       zFilename, pFirst->nLine);
    return 1;
  }
  pDecl = FindDecl(pClass->zText, pClass->nText);
  if( pDecl==0 || (pDecl->flags & TY_Class)!=TY_Class ){
    pDecl = CreateDecl(pClass->zText, pClass->nText);
    DeclSetProperty(pDecl, TY_Class);
  }
  StringInit(&str);
  if( pDecl->zExtra ){
    StringAppend(&str, pDecl->zExtra, 0);
    SafeFree(pDecl->zExtra);
    pDecl->zExtra = 0;
  }
  type = flags & PS_PPP;
  if( pDecl->extraType!=type ){
    if( type & PS_Public ){
      StringAppend(&str, "public:\n", 0);
      pDecl->extraType = PS_Public;
    }else if( type & PS_Protected ){
      StringAppend(&str, "protected:\n", 0);
      pDecl->extraType = PS_Protected;
    }else if( type & PS_Private ){
      StringAppend(&str, "private:\n", 0);
      pDecl->extraType = PS_Private;
    }
  }
  StringAppend(&str, "  ", 0);
  zDecl = TokensToString(pFirst, pLast, ";\n", pClass, 2);
  StringAppend(&str, zDecl, 0);
  SafeFree(zDecl);
  pDecl->zExtra = StrDup(StringGet(&str), 0);
  StringReset(&str);
  return 0;
}

/*
** This routine is called when we see a function or procedure definition.
** We make an entry in the declaration table that is a prototype for this
** function or procedure.
*/
static int ProcessProcedureDef(Token *pFirst, Token *pLast, int flags){
  Token *pName;
  Decl *pDecl;
  Token *pCode;

  if( pFirst==0 || pLast==0 ){
    return 0;
  }
  if( flags & PS_Method ){
    if( flags & PS_PPP ){
      return ProcessMethodDef(pFirst, pLast, flags);
    }else{
      return 0;
    }
  }
  if( (flags & PS_Static)!=0 && !proto_static ){
    return 0;
  }
  pCode = pLast;
  while( pLast && pLast!=pFirst && pLast->zText[0]!=')' ){
    pLast = pLast->pPrev;
  }
  if( pLast==0 || pLast==pFirst || pFirst->pNext==pLast ){
    fprintf(stderr,"%s:%d: Unrecognized syntax.\n", 
      zFilename, pFirst->nLine);
    return 1;
  }
  if( flags & (PS_Interface|PS_Export|PS_Local) ){
    fprintf(stderr,"%s:%d: Missing \"inline\" on function or procedure.\n",
      zFilename, pFirst->nLine);
    return 1;
  }
  pName = FindDeclName(pFirst,pLast);
  if( pName==0 ){
    fprintf(stderr,"%s:%d: Malformed function or procedure definition.\n",
      zFilename, pFirst->nLine);
    return 1;
  }

  /*
  ** At this point we've isolated a procedure declaration between pFirst
  ** and pLast with the name pName.
  */
#ifdef DEBUG
  if( debugMask & PARSER ){
    printf("**** Found routine: %.*s on line %d...\n", pName->nText,
       pName->zText, pFirst->nLine);
    PrintTokens(pFirst,pLast);
    printf(";\n");
  }
#endif
  pDecl = CreateDecl(pName->zText,pName->nText);
  pDecl->pComment = pFirst->pComment;
  if( pCode && pCode->eType==TT_Braces ){
    pDecl->tokenCode = *pCode;
  }
  DeclSetProperty(pDecl,TY_Subroutine);
  pDecl->zDecl = TokensToString(pFirst,pLast,";\n",0,0);
  if( (flags & (PS_Static|PS_Local2))!=0 ){
    DeclSetProperty(pDecl,DP_Local);
  }else if( (flags & (PS_Export2))!=0 ){
    DeclSetProperty(pDecl,DP_Export);
  }

  if( flags & DP_Cplusplus ){
    DeclSetProperty(pDecl,DP_Cplusplus);
  }else{
    DeclSetProperty(pDecl,DP_ExternCReqd);
  }

  return 0;
}

/*
** This routine is called whenever we see the "inline" keyword.  We
** need to seek-out the inline function or procedure and make a
** declaration out of the entire definition.
*/
static int ProcessInlineProc(Token *pFirst, int flags, int *pReset){
  Token *pName;
  Token *pEnd;
  Decl *pDecl;

  for(pEnd=pFirst; pEnd; pEnd = pEnd->pNext){
    if( pEnd->zText[0]=='{' || pEnd->zText[0]==';' ){
      *pReset = pEnd->zText[0];
      break;
    }
  }
  if( pEnd==0 ){
    *pReset = ';';
    fprintf(stderr,"%s:%d: incomplete inline procedure definition\n",
      zFilename, pFirst->nLine);
    return 1;
  }
  pName = FindDeclName(pFirst,pEnd);
  if( pName==0 ){
    fprintf(stderr,"%s:%d: malformed inline procedure definition\n",
      zFilename, pFirst->nLine);
    return 1;
  }

#ifdef DEBUG
  if( debugMask & PARSER ){
    printf("**** Found inline routine: %.*s on line %d...\n", 
       pName->nText, pName->zText, pFirst->nLine);
    PrintTokens(pFirst,pEnd);
    printf("\n");
  }
#endif
  pDecl = CreateDecl(pName->zText,pName->nText);
  pDecl->pComment = pFirst->pComment;
  DeclSetProperty(pDecl,TY_Subroutine);
  pDecl->zDecl = TokensToString(pFirst,pEnd,";\n",0,0);
  if( (flags & (PS_Static|PS_Local|PS_Local2)) ){
    DeclSetProperty(pDecl,DP_Local);
  }else if( flags & (PS_Export|PS_Export2) ){
    DeclSetProperty(pDecl,DP_Export);
  }

  if( flags & DP_Cplusplus ){
    DeclSetProperty(pDecl,DP_Cplusplus);
  }else{
    DeclSetProperty(pDecl,DP_ExternCReqd);
  }

  return 0;
}

/*
** Determine if the tokens between pFirst and pEnd form a variable
** definition or a function prototype.  Return TRUE if we are dealing
** with a variable defintion and FALSE for a prototype.
**
** pEnd is the token that ends the object.  It can be either a ';' or
** a '='.  If it is '=', then assume we have a variable definition.
**
** If pEnd is ';', then the determination is more difficult.  We have
** to search for an occurance of an ID followed immediately by '('.
** If found, we have a prototype.  Otherwise we are dealing with a
** variable definition.
*/
static int isVariableDef(Token *pFirst, Token *pEnd){
  if( pEnd && pEnd->zText[0]=='=' && 
    (pEnd->pPrev->nText!=8 || strncmp(pEnd->pPrev->zText,"operator",8)!=0)
  ){
    return 1;
  }
  while( pFirst && pFirst!=pEnd && pFirst->pNext && pFirst->pNext!=pEnd ){
    if( pFirst->eType==TT_Id && pFirst->pNext->zText[0]=='(' ){
      return 0;
    }
    pFirst = pFirst->pNext;
  }
  return 1;
}


/*
** This routine is called whenever we encounter a ";" or "=".  The stuff
** between pFirst and pLast constitutes either a typedef or a global
** variable definition.  Do the right thing.
*/
static int ProcessDecl(Token *pFirst, Token *pEnd, int flags){
  Token *pName;
  Decl *pDecl;
  int isLocal = 0;
  int isVar;
  int nErr = 0;

  if( pFirst==0 || pEnd==0 ){
    return 0;
  }
  if( flags & PS_Typedef ){
    if( (flags & (PS_Export2|PS_Local2))!=0 ){
      fprintf(stderr,"%s:%d: \"EXPORT\" or \"LOCAL\" ignored before typedef.\n",
        zFilename, pFirst->nLine);
      nErr++;
    }
    if( (flags & (PS_Interface|PS_Export|PS_Local|DP_Cplusplus))==0 ){
      /* It is illegal to duplicate a typedef in C (but OK in C++).
      ** So don't record typedefs that aren't within a C++ file or
      ** within #if INTERFACE..#endif */
      return nErr;
    }
    if( (flags & (PS_Interface|PS_Export|PS_Local))==0 && proto_static==0 ){
      /* Ignore typedefs that are not with "#if INTERFACE..#endif" unless
      ** the "-local" command line option is used. */
      return nErr;
    }
    if( (flags & (PS_Interface|PS_Export))==0 ){
      /* typedefs are always local, unless within #if INTERFACE..#endif */
      isLocal = 1;
    }
  }else if( flags & (PS_Static|PS_Local2) ){
    if( proto_static==0 && (flags & PS_Local2)==0 ){
      /* Don't record static variables unless the "-local" command line
      ** option was specified or the "LOCAL" keyword is used. */
      return nErr;
    }
    while( pFirst!=0 && pFirst->pNext!=pEnd &&
       ((pFirst->nText==6 && strncmp(pFirst->zText,"static",6)==0)
        || (pFirst->nText==5 && strncmp(pFirst->zText,"LOCAL",6)==0))
    ){
      /* Lose the initial "static" or local from local variables. 
      ** We'll prepend "extern" later. */
      pFirst = pFirst->pNext;
      isLocal = 1;
    }
    if( pFirst==0 || !isLocal ){
      return nErr;
    }
  }else if( flags & PS_Method ){
    /* Methods are declared by their class.  Don't declare separately. */
    return nErr;
  }
  isVar =  (flags & (PS_Typedef|PS_Method))==0 && isVariableDef(pFirst,pEnd);
  if( isVar && (flags & (PS_Interface|PS_Export|PS_Local))!=0 
  && (flags & PS_Extern)==0 ){
    fprintf(stderr,"%s:%d: Can't define a variable in this context\n",
      zFilename, pFirst->nLine);
    nErr++;
  }
  pName = FindDeclName(pFirst,pEnd->pPrev);
  if( pName==0 ){
    fprintf(stderr,"%s:%d: Can't find a name for the object declared here.\n",
      zFilename, pFirst->nLine);
    return nErr+1;
  }

#ifdef DEBUG
  if( debugMask & PARSER ){
    if( flags & PS_Typedef ){
      printf("**** Found typedef %.*s at line %d...\n",
        pName->nText, pName->zText, pName->nLine);
    }else if( isVar ){
      printf("**** Found variable %.*s at line %d...\n",
        pName->nText, pName->zText, pName->nLine);
    }else{
      printf("**** Found prototype %.*s at line %d...\n",
        pName->nText, pName->zText, pName->nLine);
    }
    PrintTokens(pFirst,pEnd->pPrev);
    printf(";\n");
  }
#endif

  pDecl = CreateDecl(pName->zText,pName->nText);
  if( (flags & PS_Typedef) ){
    DeclSetProperty(pDecl, TY_Typedef);
  }else if( isVar ){
    DeclSetProperty(pDecl,DP_ExternReqd | TY_Variable);
    if( !(flags & DP_Cplusplus) ){
      DeclSetProperty(pDecl,DP_ExternCReqd);
    }
  }else{
    DeclSetProperty(pDecl, TY_Subroutine);
    if( !(flags & DP_Cplusplus) ){
      DeclSetProperty(pDecl,DP_ExternCReqd);
    }
  }
  pDecl->pComment = pFirst->pComment;
  pDecl->zDecl = TokensToString(pFirst,pEnd->pPrev,";\n",0,0);
  if( isLocal || (flags & (PS_Local|PS_Local2))!=0 ){
    DeclSetProperty(pDecl,DP_Local);
  }else if( flags & (PS_Export|PS_Export2) ){
    DeclSetProperty(pDecl,DP_Export);
  }
  if( flags & DP_Cplusplus ){
    DeclSetProperty(pDecl,DP_Cplusplus);
  }
  return nErr;
}

/*
** Push an if condition onto the if stack
*/
static void PushIfMacro(
  const char *zPrefix,      /* A prefix, like "define" or "!" */
  const char *zText,        /* The condition */
  int nText,                /* Number of characters in zText */
  int nLine,                /* Line number where this macro occurs */
  int flags                 /* Either 0, PS_Interface, PS_Export or PS_Local */
){
  Ifmacro *pIf;
  int nByte;

  nByte = sizeof(Ifmacro);
  if( zText ){
    if( zPrefix ){
      nByte += strlen(zPrefix) + 2;
    }
    nByte += nText + 1;
  }
  pIf = SafeMalloc( nByte );
  if( zText ){
    pIf->zCondition = (char*)&pIf[1];
    if( zPrefix ){
      sprintf(pIf->zCondition,"%s(%.*s)",zPrefix,nText,zText);
    }else{
      sprintf(pIf->zCondition,"%.*s",nText,zText);
    }
  }else{
    pIf->zCondition = 0;
  }
  pIf->nLine = nLine;
  pIf->flags = flags;
  pIf->pNext = ifStack;
  ifStack = pIf;
}

/*
** This routine is called to handle all preprocessor directives.
**
** This routine will recompute the value of *pPresetFlags to be the
** logical or of all flags on all nested #ifs.  The #ifs that set flags
** are as follows:
**
**        conditional                   flag set
**        ------------------------      --------------------
**        #if INTERFACE                 PS_Interface
**        #if EXPORT_INTERFACE          PS_Export
**        #if LOCAL_INTERFACE           PS_Local
**
** For example, if after processing the preprocessor token given
** by pToken there is an "#if INTERFACE" on the preprocessor
** stack, then *pPresetFlags will be set to PS_Interface.
*/
static int ParsePreprocessor(Token *pToken, int flags, int *pPresetFlags){
  const char *zCmd;
  int nCmd;
  const char *zArg;
  int nArg;
  int nErr = 0;
  Ifmacro *pIf;

  zCmd = &pToken->zText[1];
  while( isspace(*zCmd) && *zCmd!='\n' ){
    zCmd++;
  }
  if( !isalpha(*zCmd) ){
    return 0;
  }
  nCmd = 1;
  while( isalpha(zCmd[nCmd]) ){
    nCmd++;
  }

  if( nCmd==5 && strncmp(zCmd,"endif",5)==0 ){
    /*
    ** Pop the if stack 
    */
    pIf = ifStack;
    if( pIf==0 ){
      fprintf(stderr,"%s:%d: extra '#endif'.\n",zFilename,pToken->nLine);
      return 1;
    }
    ifStack = pIf->pNext;
    SafeFree(pIf);
  }else if( nCmd==6 && strncmp(zCmd,"define",6)==0 ){
    /*
    ** Record a #define if we are in PS_Interface or PS_Export 
    */
    Decl *pDecl;
    if( !(flags & (PS_Local|PS_Interface|PS_Export)) ){ return 0; }
    zArg = &zCmd[6];
    while( *zArg && isspace(*zArg) && *zArg!='\n' ){
      zArg++;
    }
    if( *zArg==0 || *zArg=='\n' ){ return 0; }
    for(nArg=0; ISALNUM(zArg[nArg]); nArg++){}
    if( nArg==0 ){ return 0; }
    pDecl = CreateDecl(zArg,nArg);
    pDecl->pComment = pToken->pComment;
    DeclSetProperty(pDecl,TY_Macro);
    pDecl->zDecl = SafeMalloc( pToken->nText + 2 );
    sprintf(pDecl->zDecl,"%.*s\n",pToken->nText,pToken->zText);
    if( flags & PS_Export ){
      DeclSetProperty(pDecl,DP_Export);
    }else if( flags & PS_Local ){
      DeclSetProperty(pDecl,DP_Local);
    }
  }else if( nCmd==7 && strncmp(zCmd,"include",7)==0 ){
    /*
    ** Record an #include if we are in PS_Interface or PS_Export 
    */
    Include *pInclude;
    char *zIf;

    if( !(flags & (PS_Interface|PS_Export)) ){ return 0; }
    zArg = &zCmd[7];
    while( *zArg && isspace(*zArg) ){ zArg++; }
    for(nArg=0; !isspace(zArg[nArg]); nArg++){}
    if( (zArg[0]=='"' && zArg[nArg-1]!='"')
      ||(zArg[0]=='<' && zArg[nArg-1]!='>')
    ){
      fprintf(stderr,"%s:%d: malformed #include statement.\n",
        zFilename,pToken->nLine);
      return 1;
    }
    zIf = GetIfString();
    if( zIf ){
      pInclude = SafeMalloc( sizeof(Include) + nArg*2 + strlen(zIf) + 10 );
      pInclude->zFile = (char*)&pInclude[1];
      pInclude->zLabel = &pInclude->zFile[nArg+1];
      sprintf(pInclude->zFile,"%.*s",nArg,zArg);
      sprintf(pInclude->zLabel,"%.*s:%s",nArg,zArg,zIf);
      pInclude->zIf = &pInclude->zLabel[nArg+1];
      SafeFree(zIf);
    }else{
      pInclude = SafeMalloc( sizeof(Include) + nArg + 1 );
      pInclude->zFile = (char*)&pInclude[1];
      sprintf(pInclude->zFile,"%.*s",nArg,zArg);
      pInclude->zIf = 0;
      pInclude->zLabel = pInclude->zFile;
    }
    pInclude->pNext = includeList;
    includeList = pInclude;
  }else if( nCmd==2 && strncmp(zCmd,"if",2)==0 ){
    /*
    ** Push an #if.  Watch for the special cases of INTERFACE
    ** and EXPORT_INTERFACE and LOCAL_INTERFACE
    */
    zArg = &zCmd[2];
    while( *zArg && isspace(*zArg) && *zArg!='\n' ){
      zArg++;
    }
    if( *zArg==0 || *zArg=='\n' ){ return 0; }
    nArg = pToken->nText + (int)(pToken->zText - zArg);
    if( nArg==9 && strncmp(zArg,"INTERFACE",9)==0 ){
      PushIfMacro(0,0,0,pToken->nLine,PS_Interface);
    }else if( nArg==16 && strncmp(zArg,"EXPORT_INTERFACE",16)==0 ){
      PushIfMacro(0,0,0,pToken->nLine,PS_Export);
    }else if( nArg==15 && strncmp(zArg,"LOCAL_INTERFACE",15)==0 ){
      PushIfMacro(0,0,0,pToken->nLine,PS_Local);
    }else{
      PushIfMacro(0,zArg,nArg,pToken->nLine,0);
    }
  }else if( nCmd==5 && strncmp(zCmd,"ifdef",5)==0 ){
    /* 
    ** Push an #ifdef.
    */
    zArg = &zCmd[5];
    while( *zArg && isspace(*zArg) && *zArg!='\n' ){
      zArg++;
    }
    if( *zArg==0 || *zArg=='\n' ){ return 0; }
    nArg = pToken->nText + (int)(pToken->zText - zArg);
    PushIfMacro("defined",zArg,nArg,pToken->nLine,0);
  }else if( nCmd==6 && strncmp(zCmd,"ifndef",6)==0 ){
    /*
    ** Push an #ifndef.
    */
    zArg = &zCmd[6];
    while( *zArg && isspace(*zArg) && *zArg!='\n' ){
      zArg++;
    }
    if( *zArg==0 || *zArg=='\n' ){ return 0; }
    nArg = pToken->nText + (int)(pToken->zText - zArg);
    PushIfMacro("!defined",zArg,nArg,pToken->nLine,0);
  }else if( nCmd==4 && strncmp(zCmd,"else",4)==0 ){
    /*
    ** Invert the #if on the top of the stack 
    */
    if( ifStack==0 ){
      fprintf(stderr,"%s:%d: '#else' without an '#if'\n",zFilename,
         pToken->nLine);
      return 1;
    }
    pIf = ifStack;
    if( pIf->zCondition ){
      ifStack = ifStack->pNext;
      PushIfMacro("!",pIf->zCondition,strlen(pIf->zCondition),pIf->nLine,0);
      SafeFree(pIf);
    }else{
      pIf->flags = 0;
    }
  }else{
    /*
    ** This directive can be safely ignored 
    */
    return 0;
  }

  /* 
  ** Recompute the preset flags 
  */
  *pPresetFlags = 0;
  for(pIf = ifStack; pIf; pIf=pIf->pNext){
    *pPresetFlags |= pIf->flags;
  }
    
  return nErr;
}

/*
** Parse an entire file.  Return the number of errors.
**
** pList is a list of tokens in the file.  Whitespace tokens have been
** eliminated, and text with {...} has been collapsed into a
** single TT_Brace token.
** 
** initFlags are a set of parse flags that should always be set for this
** file.  For .c files this is normally 0.  For .h files it is PS_Interface.
*/
static int ParseFile(Token *pList, int initFlags){
  int nErr = 0;
  Token *pStart = 0;
  int flags = initFlags;
  int presetFlags = initFlags;
  int resetFlag = 0;

  includeList = 0;
  while( pList ){
    switch( pList->eType ){
    case TT_EOF:
      goto end_of_loop;

    case TT_Preprocessor:
      nErr += ParsePreprocessor(pList,flags,&presetFlags);
      pStart = 0;
      presetFlags |= initFlags;
      flags = presetFlags;
      break;

    case TT_Other:
      switch( pList->zText[0] ){
      case ';':
        nErr += ProcessDecl(pStart,pList,flags);
        pStart = 0;
        flags = presetFlags;
        break;

      case '=':
        if( pList->pPrev->nText==8 
            && strncmp(pList->pPrev->zText,"operator",8)==0 ){
          break;
        }
        nErr += ProcessDecl(pStart,pList,flags);
        pStart = 0;
        while( pList && pList->zText[0]!=';' ){
          pList = pList->pNext;
        }
        if( pList==0 ) goto end_of_loop;
        flags = presetFlags;
        break;

      case ':':
        if( pList->zText[1]==':' ){
          flags |= PS_Method;
        }
        break;

      default:
        break;
      }
      break;

    case TT_Braces:
      nErr += ProcessProcedureDef(pStart,pList,flags);
      pStart = 0;
      flags = presetFlags;
      break;

    case TT_Id:
       if( pStart==0 ){
          pStart = pList;
          flags = presetFlags;
       }
       resetFlag = 0;
       switch( pList->zText[0] ){
       case 'c':
         if( pList->nText==5 && strncmp(pList->zText,"class",5)==0 ){
           nErr += ProcessTypeDecl(pList,flags,&resetFlag);
         }
         break;

       case 'E':
         if( pList->nText==6 && strncmp(pList->zText,"EXPORT",6)==0 ){
           flags |= PS_Export2;
           /* pStart = 0; */
         }
         break;

       case 'e':
         if( pList->nText==4 && strncmp(pList->zText,"enum",4)==0 ){
           if( pList->pNext && pList->pNext->eType==TT_Braces ){
             pList = pList->pNext;
           }else{
             nErr += ProcessTypeDecl(pList,flags,&resetFlag);
           }
         }else if( pList->nText==6 && strncmp(pList->zText,"extern",6)==0 ){
           pList = pList->pNext;
           if( pList && pList->nText==3 && strncmp(pList->zText,"\"C\"",3)==0 ){
             pList = pList->pNext;
             flags &= ~DP_Cplusplus;
           }else{
             flags |= PS_Extern;
           }
           pStart = pList;
         }
         break;

       case 'i':
         if( pList->nText==6 && strncmp(pList->zText,"inline",6)==0 ){
           nErr += ProcessInlineProc(pList,flags,&resetFlag);
         }
         break;

       case 'L':
         if( pList->nText==5 && strncmp(pList->zText,"LOCAL",5)==0 ){
           flags |= PS_Local2;
           pStart = pList;
         }
         break;

       case 'P':
         if( pList->nText==6 && strncmp(pList->zText, "PUBLIC",6)==0 ){
           flags |= PS_Public;
           pStart = pList;
         }else if( pList->nText==7 && strncmp(pList->zText, "PRIVATE",7)==0 ){
           flags |= PS_Private;
           pStart = pList;
         }else if( pList->nText==9 && strncmp(pList->zText,"PROTECTED",9)==0 ){
           flags |= PS_Protected;
           pStart = pList;
         }
         break;

       case 's':
         if( pList->nText==6 && strncmp(pList->zText,"struct",6)==0 ){
           if( pList->pNext && pList->pNext->eType==TT_Braces ){
             pList = pList->pNext;
           }else{
             nErr += ProcessTypeDecl(pList,flags,&resetFlag);
           }
         }else if( pList->nText==6 && strncmp(pList->zText,"static",6)==0 ){
           flags |= PS_Static;
         }
         break;

       case 't':
         if( pList->nText==7 && strncmp(pList->zText,"typedef",7)==0 ){
           flags |= PS_Typedef;
         }
         break;

       case 'u':
         if( pList->nText==5 && strncmp(pList->zText,"union",5)==0 ){
           if( pList->pNext && pList->pNext->eType==TT_Braces ){
             pList = pList->pNext;
           }else{
             nErr += ProcessTypeDecl(pList,flags,&resetFlag);
           }
         }
         break;

       default:
         break;
       }
       if( resetFlag!=0 ){
         while( pList && pList->zText[0]!=resetFlag ){
           pList = pList->pNext;
         }
         if( pList==0 ) goto end_of_loop;
         pStart = 0;
         flags = presetFlags;
       }
       break;

    case TT_String:
    case TT_Number:
       break;

    default:
       pStart = pList;
       flags = presetFlags;
       break;
    }
    pList = pList->pNext;
  }
  end_of_loop:

  /* Verify that all #ifs have a matching "#endif" */
  while( ifStack ){
    Ifmacro *pIf = ifStack;
    ifStack = pIf->pNext;
    fprintf(stderr,"%s:%d: This '#if' has no '#endif'\n",zFilename,
      pIf->nLine);
    SafeFree(pIf);
  }

  return nErr;
}

/*
** If the given Decl object has a non-null zExtra field, then the text
** of that zExtra field needs to be inserted in the middle of the
** zDecl field before the last "}" in the zDecl.  This routine does that.
** If the zExtra is NULL, this routine is a no-op.
**
** zExtra holds extra method declarations for classes.  The declarations
** have to be inserted into the class definition.
*/
static void InsertExtraDecl(Decl *pDecl){
  int i;
  String str;

  if( pDecl==0 || pDecl->zExtra==0 || pDecl->zDecl==0 ) return;
  i = strlen(pDecl->zDecl) - 1;
  while( i>0 && pDecl->zDecl[i]!='}' ){ i--; }
  StringInit(&str);
  StringAppend(&str, pDecl->zDecl, i);
  StringAppend(&str, pDecl->zExtra, 0);
  StringAppend(&str, &pDecl->zDecl[i], 0);
  SafeFree(pDecl->zDecl);
  SafeFree(pDecl->zExtra);
  pDecl->zDecl = StrDup(StringGet(&str), 0);
  StringReset(&str);
  pDecl->zExtra = 0;
}

/*
** Reset the DP_Forward and DP_Declared flags on all Decl structures.
** Set both flags for anything that is tagged as local and isn't 
** in the file zFilename so that it won't be printing in other files.
*/
static void ResetDeclFlags(char *zFilename){
  Decl *pDecl;

  for(pDecl = pDeclFirst; pDecl; pDecl = pDecl->pNext){
    DeclClearProperty(pDecl,DP_Forward|DP_Declared);
    if( DeclHasProperty(pDecl,DP_Local) && pDecl->zFile!=zFilename ){
      DeclSetProperty(pDecl,DP_Forward|DP_Declared);
    }
  }
}

/*
** Forward declaration of the ScanText() function.
*/
static void ScanText(const char*, GenState *pState);

/*
** The output in pStr is currently within an #if CONTEXT where context
** is equal to *pzIf.  (*pzIf might be NULL to indicate that we are
** not within any #if at the moment.)  We are getting ready to output
** some text that needs to be within the context of "#if NEW" where
** NEW is zIf.  Make an appropriate change to the context.
*/
static void ChangeIfContext(
  const char *zIf,       /* The desired #if context */
  GenState *pState       /* Current state of the code generator */
){
  if( zIf==0 ){
    if( pState->zIf==0 ) return;
    StringAppend(pState->pStr,"#endif\n",0);
    pState->zIf = 0;
  }else{
    if( pState->zIf ){
      if( strcmp(zIf,pState->zIf)==0 ) return;
      StringAppend(pState->pStr,"#endif\n",0);
      pState->zIf = 0;
    }
    ScanText(zIf, pState);
    if( pState->zIf!=0 ){
      StringAppend(pState->pStr,"#endif\n",0);
    }
    StringAppend(pState->pStr,"#if ",0);
    StringAppend(pState->pStr,zIf,0);
    StringAppend(pState->pStr,"\n",0);
    pState->zIf = zIf;
  }
}

/*
** Add to the string pStr a #include of every file on the list of
** include files pInclude.  The table pTable contains all files that
** have already been #included at least once.  Don't add any
** duplicates.  Update pTable with every new #include that is added.
*/
static void AddIncludes(
  Include *pInclude,       /* Write every #include on this list */
  GenState *pState         /* Current state of the code generator */
){
  if( pInclude ){
    if( pInclude->pNext ){
      AddIncludes(pInclude->pNext,pState);
    }
    if( IdentTableInsert(pState->pTable,pInclude->zLabel,0) ){
      ChangeIfContext(pInclude->zIf,pState);
      StringAppend(pState->pStr,"#include ",0);
      StringAppend(pState->pStr,pInclude->zFile,0);
      StringAppend(pState->pStr,"\n",1);
    }
  }
}

/*
** Add to the string pStr a declaration for the object described
** in pDecl.
**
** If pDecl has already been declared in this file, detect that
** fact and abort early.  Do not duplicate a declaration.
**
** If the needFullDecl flag is false and this object has a forward
** declaration, then supply the forward declaration only.  A later
** call to CompleteForwardDeclarations() will finish the declaration
** for us.  But if needFullDecl is true, we must supply the full
** declaration now.  Some objects do not have a forward declaration.
** For those objects, we must print the full declaration now.
**
** Because it is illegal to duplicate a typedef in C, care is taken
** to insure that typedefs for the same identifier are only issued once.
*/
static void DeclareObject(
  Decl *pDecl,        /* The thing to be declared */
  GenState *pState,   /* Current state of the code generator */
  int needFullDecl    /* Must have the full declaration.  A forward
                       * declaration isn't enough */
){
  Decl *p;               /* The object to be declared */
  int flag;
  int isCpp;             /* True if generating C++ */
  int doneTypedef = 0;   /* True if a typedef has been done for this object */

  /* printf("BEGIN %s of %s\n",needFullDecl?"FULL":"PROTOTYPE",pDecl->zName);*/
  /* 
  ** For any object that has a forward declaration, go ahead and do the
  ** forward declaration first.
  */
  isCpp = (pState->flags & DP_Cplusplus) != 0;
  for(p=pDecl; p; p=p->pSameName){
    if( p->zFwd ){
      if( !DeclHasProperty(p,DP_Forward) ){
        DeclSetProperty(p,DP_Forward);
        if( strncmp(p->zFwd,"typedef",7)==0 ){
          if( doneTypedef ) continue;
          doneTypedef = 1;
        }
        ChangeIfContext(p->zIf,pState);
        StringAppend(pState->pStr,isCpp ? p->zFwdCpp : p->zFwd,0);
      }
    }
  }

  /*
  ** Early out if everything is already suitably declared.
  **
  ** This is a very important step because it prevents us from
  ** executing the code the follows in a recursive call to this
  ** function with the same value for pDecl.
  */
  flag = needFullDecl ? DP_Declared|DP_Forward : DP_Forward;
  for(p=pDecl; p; p=p->pSameName){
    if( !DeclHasProperty(p,flag) ) break;
  }
  if( p==0 ){
    return;
  }

  /*
  ** Make sure we have all necessary #includes
  */
  for(p=pDecl; p; p=p->pSameName){
    AddIncludes(p->pInclude,pState);
  }

  /*
  ** Go ahead an mark everything as being declared, to prevent an
  ** infinite loop thru the ScanText() function.  At the same time,
  ** we decide which objects need a full declaration and mark them
  ** with the DP_Flag bit.  We are only able to use DP_Flag in this
  ** way because we know we'll never execute this far into this
  ** function on a recursive call with the same pDecl.  Hence, recursive
  ** calls to this function (through ScanText()) can never change the
  ** value of DP_Flag out from under us.
  */
  for(p=pDecl; p; p=p->pSameName){
    if( !DeclHasProperty(p,DP_Declared) 
     && (p->zFwd==0 || needFullDecl) 
     && p->zDecl!=0
    ){
      DeclSetProperty(p,DP_Forward|DP_Declared|DP_Flag);
    }else{
      DeclClearProperty(p,DP_Flag);
    }
  }

  /*
  ** Call ScanText() recusively (this routine is called from ScanText())
  ** to include declarations required to come before these declarations.
  */
  for(p=pDecl; p; p=p->pSameName){
    if( DeclHasProperty(p,DP_Flag) ){
      if( p->zDecl[0]=='#' ){
        ScanText(&p->zDecl[1],pState);
      }else{
        InsertExtraDecl(p);
        ScanText(p->zDecl,pState);
      }
    }
  }

  /*
  ** Output the declarations.  Do this in two passes.  First
  ** output everything that isn't a typedef.  Then go back and
  ** get the typedefs by the same name.
  */
  for(p=pDecl; p; p=p->pSameName){
    if( DeclHasProperty(p,DP_Flag) && !DeclHasProperty(p,TY_Typedef) ){
      if( DeclHasAnyProperty(p,TY_Enumeration) ){
        if( doneTypedef ) continue;
        doneTypedef = 1;
      }
      ChangeIfContext(p->zIf,pState);
      if( !isCpp && DeclHasAnyProperty(p,DP_ExternReqd) ){
        StringAppend(pState->pStr,"extern ",0);
      }else if( isCpp && DeclHasProperty(p,DP_Cplusplus|DP_ExternReqd) ){
        StringAppend(pState->pStr,"extern ",0);
      }else if( isCpp && DeclHasAnyProperty(p,DP_ExternCReqd|DP_ExternReqd) ){
        StringAppend(pState->pStr,"extern \"C\" ",0);
      }
      InsertExtraDecl(p);
      StringAppend(pState->pStr,p->zDecl,0);
      if( !isCpp && DeclHasProperty(p,DP_Cplusplus) ){
        fprintf(stderr,
          "%s: C code ought not reference the C++ object \"%s\"\n",
          pState->zFilename, p->zName);
        pState->nErr++;
      }
      DeclClearProperty(p,DP_Flag);
    }
  }
  for(p=pDecl; p && !doneTypedef; p=p->pSameName){
    if( DeclHasProperty(p,DP_Flag) ){
      /* This has to be a typedef */
      doneTypedef = 1;
      ChangeIfContext(p->zIf,pState);
      InsertExtraDecl(p);
      StringAppend(pState->pStr,p->zDecl,0);
    }
  }
}

/*
** This routine scans the input text given, and appends to the
** string in pState->pStr the text of any declarations that must
** occur before the text in zText.
**
** If an identifier in zText is immediately followed by '*', then
** only forward declarations are needed for that identifier.  If the
** identifier name is not followed immediately by '*', we must supply
** a full declaration.
*/
static void ScanText(
  const char *zText,    /* The input text to be scanned */
  GenState *pState      /* Current state of the code generator */
){
  int nextValid = 0;    /* True is sNext contains valid data */
  InStream sIn;         /* The input text */
  Token sToken;         /* The current token being examined */
  Token sNext;          /* The next non-space token */

  /* printf("BEGIN SCAN TEXT on %s\n", zText); */

  sIn.z = zText;
  sIn.i = 0;
  sIn.nLine = 1;
  while( sIn.z[sIn.i]!=0 ){
    if( nextValid ){
      sToken = sNext;
      nextValid = 0;
    }else{
      GetNonspaceToken(&sIn,&sToken);
    }
    if( sToken.eType==TT_Id ){
      int needFullDecl;   /* True if we need to provide the full declaration,
                          ** not just the forward declaration */
      Decl *pDecl;        /* The declaration having the name in sToken */

      /*
      ** See if there is a declaration in the database with the name given
      ** by sToken.
      */
      pDecl = FindDecl(sToken.zText,sToken.nText);
      if( pDecl==0 ) continue;

      /* 
      ** If we get this far, we've found an identifier that has a 
      ** declaration in the database.  Now see if we the full declaration
      ** or just a forward declaration.
      */
      GetNonspaceToken(&sIn,&sNext);
      if( sNext.zText[0]=='*' ){
        needFullDecl = 0;
      }else{
        needFullDecl = 1;
        nextValid = sNext.eType==TT_Id;
      }

      /*
      ** Generate the needed declaration.
      */
      DeclareObject(pDecl,pState,needFullDecl);
    }else if( sToken.eType==TT_Preprocessor ){
      sIn.i -= sToken.nText - 1;
    }
  }
  /* printf("END SCANTEXT\n"); */
}

/*
** Provide a full declaration to any object which so far has had only
** a foward declaration.
*/
static void CompleteForwardDeclarations(GenState *pState){
  Decl *pDecl;
  int progress;

  do{
    progress = 0;
    for(pDecl=pDeclFirst; pDecl; pDecl=pDecl->pNext){
      if( DeclHasProperty(pDecl,DP_Forward) 
       && !DeclHasProperty(pDecl,DP_Declared) 
      ){
        DeclareObject(pDecl,pState,1);
        progress = 1;
        assert( DeclHasProperty(pDecl,DP_Declared) );
      }
    }
  }while( progress );
}

/*
** Generate an include file for the given source file.  Return the number
** of errors encountered.
**
** if nolocal_flag is true, then we do not generate declarations for
** objected marked DP_Local.
*/
static int MakeHeader(InFile *pFile, FILE *report, int nolocal_flag){
  int nErr = 0;
  GenState sState;
  String outStr;
  IdentTable includeTable;
  Ident *pId;
  char *zNewVersion;
  char *zOldVersion;

  if( pFile->zHdr==0 || *pFile->zHdr==0 ) return 0;
  sState.pStr = &outStr;
  StringInit(&outStr);
  StringAppend(&outStr,zTopLine,nTopLine);
  sState.pTable = &includeTable;
  memset(&includeTable,0,sizeof(includeTable));
  sState.zIf = 0;
  sState.nErr = 0;
  sState.zFilename = pFile->zSrc;
  sState.flags = pFile->flags & DP_Cplusplus;
  ResetDeclFlags(nolocal_flag ? "no" : pFile->zSrc);
  for(pId = pFile->idTable.pList; pId; pId=pId->pNext){
    Decl *pDecl = FindDecl(pId->zName,0);
    if( pDecl ){
      DeclareObject(pDecl,&sState,1);
    }
  }
  CompleteForwardDeclarations(&sState);
  ChangeIfContext(0,&sState);
  nErr += sState.nErr;
  zOldVersion = ReadFile(pFile->zHdr);
  zNewVersion = StringGet(&outStr);
  if( report ) fprintf(report,"%s: ",pFile->zHdr);
  if( zOldVersion==0 ){
    if( report ) fprintf(report,"updated\n");
    if( WriteFile(pFile->zHdr,zNewVersion) ){
      fprintf(stderr,"%s: Can't write to file\n",pFile->zHdr);
      nErr++;
    }
  }else if( strncmp(zOldVersion,zTopLine,nTopLine)!=0 ){
    if( report ) fprintf(report,"error!\n");
    fprintf(stderr,
       "%s: Can't overwrite this file because it wasn't previously\n"
       "%*s  generated by 'makeheaders'.\n",
       pFile->zHdr, (int)strlen(pFile->zHdr), "");
    nErr++;
  }else if( strcmp(zOldVersion,zNewVersion)!=0 ){
    if( report ) fprintf(report,"updated\n");
    if( WriteFile(pFile->zHdr,zNewVersion) ){
      fprintf(stderr,"%s: Can't write to file\n",pFile->zHdr);
      nErr++;
    }
  }else if( report ){
    fprintf(report,"unchanged\n");
  }
  SafeFree(zOldVersion); 
  IdentTableReset(&includeTable);
  StringReset(&outStr);
  return nErr;
}

/*
** Generate a global header file -- a header file that contains all
** declarations.  If the forExport flag is true, then only those
** objects that are exported are included in the header file.
*/
static int MakeGlobalHeader(int forExport){
  GenState sState;
  String outStr;
  IdentTable includeTable;
  Decl *pDecl;

  sState.pStr = &outStr;
  StringInit(&outStr);
  /* StringAppend(&outStr,zTopLine,nTopLine); */
  sState.pTable = &includeTable;
  memset(&includeTable,0,sizeof(includeTable));
  sState.zIf = 0;
  sState.nErr = 0;
  sState.zFilename = "(all)";
  sState.flags = 0;
  ResetDeclFlags(0);
  for(pDecl=pDeclFirst; pDecl; pDecl=pDecl->pNext){
    if( forExport==0 || DeclHasProperty(pDecl,DP_Export) ){
      DeclareObject(pDecl,&sState,1);
    }
  }
  ChangeIfContext(0,&sState);
  printf("%s",StringGet(&outStr));
  IdentTableReset(&includeTable);
  StringReset(&outStr);
  return 0;  
}

#ifdef DEBUG
/*
** Return the number of characters in the given string prior to the
** first newline.
*/
static int ClipTrailingNewline(char *z){
  int n = strlen(z);
  while( n>0 && (z[n-1]=='\n' || z[n-1]=='\r') ){ n--; }
  return n;
}

/*
** Dump the entire declaration list for debugging purposes
*/
static void DumpDeclList(void){
  Decl *pDecl;

  for(pDecl = pDeclFirst; pDecl; pDecl=pDecl->pNext){
    printf("**** %s from file %s ****\n",pDecl->zName,pDecl->zFile);
    if( pDecl->zIf ){
      printf("If: [%.*s]\n",ClipTrailingNewline(pDecl->zIf),pDecl->zIf);
    }
    if( pDecl->zFwd ){
      printf("Decl: [%.*s]\n",ClipTrailingNewline(pDecl->zFwd),pDecl->zFwd);
    }
    if( pDecl->zDecl ){
      InsertExtraDecl(pDecl);
      printf("Def: [%.*s]\n",ClipTrailingNewline(pDecl->zDecl),pDecl->zDecl);
    }
    if( pDecl->flags ){
      static struct {
        int mask;
        char *desc;
      } flagSet[] = {
        { TY_Class,       "class" },
        { TY_Enumeration, "enum" },
        { TY_Structure,   "struct" },
        { TY_Union,       "union" },
        { TY_Variable,    "variable" },
        { TY_Subroutine,  "function" },
        { TY_Typedef,     "typedef" },
        { TY_Macro,       "macro" },
        { DP_Export,      "export" },
        { DP_Local,       "local" },
        { DP_Cplusplus,   "C++" },
      };
      int i;
      printf("flags:");
      for(i=0; i<sizeof(flagSet)/sizeof(flagSet[0]); i++){
        if( flagSet[i].mask & pDecl->flags ){
          printf(" %s", flagSet[i].desc);
        }
      }
      printf("\n");
    }
    if( pDecl->pInclude ){
      Include *p;
      printf("includes:");
      for(p=pDecl->pInclude; p; p=p->pNext){
        printf(" %s",p->zFile);
      }
      printf("\n");
    }
  }
}
#endif

/*
** When the "-doc" command-line option is used, this routine is called
** to print all of the database information to standard output.
*/
static void DocumentationDump(void){
  Decl *pDecl;
  static struct {
    int mask;
    char flag;
  } flagSet[] = {
    { TY_Class,       'c' },
    { TY_Enumeration, 'e' },
    { TY_Structure,   's' },
    { TY_Union,       'u' },
    { TY_Variable,    'v' },
    { TY_Subroutine,  'f' },
    { TY_Typedef,     't' },
    { TY_Macro,       'm' },
    { DP_Export,      'x' },
    { DP_Local,       'l' },
    { DP_Cplusplus,   '+' },
  };

  for(pDecl = pDeclFirst; pDecl; pDecl=pDecl->pNext){
    int i;
    int nLabel = 0;
    char *zDecl;
    char zLabel[50];
    for(i=0; i<sizeof(flagSet)/sizeof(flagSet[0]); i++){
      if( DeclHasProperty(pDecl,flagSet[i].mask) ){
        zLabel[nLabel++] = flagSet[i].flag;
      }
    }
    if( nLabel==0 ) continue;
    zLabel[nLabel] = 0;
    InsertExtraDecl(pDecl);
    zDecl = pDecl->zDecl;
    if( zDecl==0 ) zDecl = pDecl->zFwd;
    printf("%s %s %s %p %d %d %d %d %d\n",
       pDecl->zName,
       zLabel,
       pDecl->zFile,
       pDecl->pComment,
       pDecl->pComment ? pDecl->pComment->nText+1 : 0,
       pDecl->zIf ? (int)strlen(pDecl->zIf)+1 : 0,
       zDecl ? (int)strlen(zDecl) : 0,
       pDecl->pComment ? pDecl->pComment->nLine : 0,
       pDecl->tokenCode.nText ? pDecl->tokenCode.nText+1 : 0
    );
    if( pDecl->pComment ){
      printf("%.*s\n",pDecl->pComment->nText, pDecl->pComment->zText);
    }
    if( pDecl->zIf ){
      printf("%s\n",pDecl->zIf);
    }
    if( zDecl ){
      printf("%s",zDecl);
    }
    if( pDecl->tokenCode.nText ){
      printf("%.*s\n",pDecl->tokenCode.nText, pDecl->tokenCode.zText);
    }
  }
}

/*
** Given the complete text of an input file, this routine prints a
** documentation record for the header comment at the beginning of the
** file (if the file has a header comment.)
*/
void PrintModuleRecord(const char *zFile, const char *zFilename){
  int i;
  static int addr = 5;
  while( isspace(*zFile) ){ zFile++; }
  if( *zFile!='/' || zFile[1]!='*' ) return;
  for(i=2; zFile[i] && (zFile[i-1]!='/' || zFile[i-2]!='*'); i++){}
  if( zFile[i]==0 ) return;
  printf("%s M %s %d %d 0 0 0 0\n%.*s\n",
    zFilename, zFilename, addr, i+1, i, zFile);
  addr += 4;
}


/*
** Given an input argument to the program, construct a new InFile
** object.
*/
static InFile *CreateInFile(char *zArg, int *pnErr){
  int nSrc;
  char *zSrc;
  InFile *pFile;
  int i;

  /* 
  ** Get the name of the input file to be scanned.  The input file is
  ** everything before the first ':' or the whole file if no ':' is seen.
  **
  ** Except, on windows, ignore any ':' that occurs as the second character
  ** since it might be part of the drive specifier.  So really, the ":' has
  ** to be the 3rd or later character in the name.  This precludes 1-character
  ** file names, which really should not be a problem.
  */
  zSrc = zArg;
  for(nSrc=2; zSrc[nSrc] && zArg[nSrc]!=':'; nSrc++){}
  pFile = SafeMalloc( sizeof(InFile) );
  memset(pFile,0,sizeof(InFile));
  pFile->zSrc = StrDup(zSrc,nSrc);

  /* Figure out if we are dealing with C or C++ code.  Assume any
  ** file with ".c" or ".h" is C code and all else is C++.
  */
  if( nSrc>2 && zSrc[nSrc-2]=='.' && (zSrc[nSrc-1]=='c' || zSrc[nSrc-1]=='h')){
    pFile->flags &= ~DP_Cplusplus;
  }else{
    pFile->flags |= DP_Cplusplus;
  }

  /*
  ** If a separate header file is specified, use it
  */
  if( zSrc[nSrc]==':' ){
    int nHdr;
    char *zHdr;
    zHdr = &zSrc[nSrc+1];
    for(nHdr=0; zHdr[nHdr] && zHdr[nHdr]!=':'; nHdr++){}
    pFile->zHdr = StrDup(zHdr,nHdr);
  }

  /* Look for any 'c' or 'C' in the suffix of the file name and change
  ** that character to 'h' or 'H' respectively.  If no 'c' or 'C' is found,
  ** then assume we are dealing with a header.
  */
  else{
    int foundC = 0;
    pFile->zHdr = StrDup(zSrc,nSrc);
    for(i = nSrc-1; i>0 && pFile->zHdr[i]!='.'; i--){
      if( pFile->zHdr[i]=='c' ){
        foundC = 1;
        pFile->zHdr[i] = 'h';
      }else if( pFile->zHdr[i]=='C' ){
        foundC = 1;
        pFile->zHdr[i] = 'H';
      }
    }
    if( !foundC ){
      SafeFree(pFile->zHdr);
      pFile->zHdr = 0;
    }
  }

  /*
  ** If pFile->zSrc contains no 'c' or 'C' in its extension, it
  ** must be a header file.   In that case, we need to set the 
  ** PS_Interface flag.
  */
  pFile->flags |= PS_Interface;
  for(i=nSrc-1; i>0 && zSrc[i]!='.'; i--){
    if( zSrc[i]=='c' || zSrc[i]=='C' ){
      pFile->flags &= ~PS_Interface;
      break;
    }
  }

  /* Done! 
  */
  return pFile;
}

/* MS-Windows and MS-DOS both have the following serious OS bug:  the
** length of a command line is severely restricted.  But this program
** occasionally requires long command lines.  Hence the following
** work around.
**
** If the parameters "-f FILENAME" appear anywhere on the command line,
** then the named file is scanned for additional command line arguments.
** These arguments are substituted in place of the "FILENAME" argument
** in the original argument list.
**
** This first parameter to this routine is the index of the "-f"
** parameter in the argv[] array.  The argc and argv are passed by
** pointer so that they can be changed.
**
** Parsing of the parameters in the file is very simple.  Parameters
** can be separated by any amount of white-space (including newlines
** and carriage returns.)  There are now quoting characters of any
** kind.  The length of a token is limited to about 1000 characters.
*/
static void AddParameters(int index, int *pArgc, char ***pArgv){
  int argc = *pArgc;      /* The original argc value */
  char **argv = *pArgv;   /* The original argv value */
  int newArgc;            /* Value for argc after inserting new arguments */
  char **zNew = 0;        /* The new argv after this routine is done */
  char *zFile;            /* Name of the input file */
  int nNew = 0;           /* Number of new entries in the argv[] file */
  int nAlloc = 0;         /* Space allocated for zNew[] */
  int i;                  /* Loop counter */
  int n;                  /* Number of characters in a new argument */
  int c;                  /* Next character of input */
  int startOfLine = 1;    /* True if we are where '#' can start a comment */
  FILE *in;               /* The input file */
  char zBuf[1000];        /* A single argument is accumulated here */

  if( index+1==argc ) return;
  zFile = argv[index+1];
  in = fopen(zFile,"r");
  if( in==0 ){
    fprintf(stderr,"Can't open input file \"%s\"\n",zFile);
    exit(1);
  }
  c = ' ';
  while( c!=EOF ){
    while( c!=EOF && isspace(c) ){
      if( c=='\n' ){
        startOfLine = 1;
      }
      c = getc(in); 
      if( startOfLine && c=='#' ){
        while( c!=EOF && c!='\n' ){
          c = getc(in);
        }
      }
    }
    n = 0;
    while( c!=EOF && !isspace(c) ){
      if( n<sizeof(zBuf)-1 ){ zBuf[n++] = c; }
      startOfLine = 0;
      c = getc(in);
    }
    zBuf[n] = 0;
    if( n>0 ){
      nNew++;
      if( nNew + argc > nAlloc ){
        if( nAlloc==0 ){
          nAlloc = 100 + argc;
          zNew = malloc( sizeof(char*) * nAlloc );
        }else{
          nAlloc *= 2;
          zNew = realloc( zNew, sizeof(char*) * nAlloc );  
        }
      }
      if( zNew ){
        int j = nNew + index;
        zNew[j] = malloc( n + 1 );
        if( zNew[j] ){
          strcpy( zNew[j], zBuf );
        }
      }
    }
  }
  newArgc = argc + nNew - 1;
  for(i=0; i<=index; i++){
    zNew[i] = argv[i];
  }
  for(i=nNew + index + 1; i<newArgc; i++){
    zNew[i] = argv[i + 1 - nNew];
  }
  zNew[newArgc] = 0;
  *pArgc = newArgc;
  *pArgv = zNew;
}

#ifdef NOT_USED
/*
** Return the time that the given file was last modified.  If we can't
** locate the file (because, for example, it doesn't exist), then
** return 0.
*/
static unsigned int ModTime(const char *zFilename){
  unsigned int mTime = 0;
  struct stat sStat;
  if( stat(zFilename,&sStat)==0 ){
    mTime = sStat.st_mtime;
  }
  return mTime;
}
#endif

/*
** Print a usage comment for this program.
*/
static void Usage(const char *argv0, const char *argvN){
  fprintf(stderr,"%s: Illegal argument \"%s\"\n",argv0,argvN);
  fprintf(stderr,"Usage: %s [options] filename...\n"
    "Options:\n"
    "  -h          Generate a single .h to standard output.\n"
    "  -H          Like -h, but only output EXPORT declarations.\n"
    "  -v          (verbose) Write status information to the screen.\n"
    "  -doc        Generate no header files.  Instead, output information\n"
    "              that can be used by an automatic program documentation\n"
    "              and cross-reference generator.\n"
    "  -local      Generate prototypes for \"static\" functions and\n"
    "              procedures.\n"
    "  -f FILE     Read additional command-line arguments from the file named\n"
    "              \"FILE\".\n"
#ifdef DEBUG
    "  -! MASK     Set the debugging mask to the number \"MASK\".\n"
#endif
    "  --          Treat all subsequent comment-line parameters as filenames,\n"
    "              even if they begin with \"-\".\n",
    argv0
  );
}

/*
** The following text contains a few simple #defines that we want
** to be available to every file.
*/
static char zInit[] = 
  "#define INTERFACE 0\n"
  "#define EXPORT_INTERFACE 0\n"
  "#define LOCAL_INTERFACE 0\n"
  "#define EXPORT\n"
  "#define LOCAL static\n"
  "#define PUBLIC\n"
  "#define PRIVATE\n"
  "#define PROTECTED\n"
;

#if TEST==0
int main(int argc, char **argv){
  int i;                /* Loop counter */
  int nErr = 0;         /* Number of errors encountered */
  Token *pList;         /* List of input tokens for one file */
  InFile *pFileList = 0;/* List of all input files */
  InFile *pTail = 0;    /* Last file on the list */
  InFile *pFile;        /* for looping over the file list */
  int h_flag = 0;       /* True if -h is present.  Output unified header */
  int H_flag = 0;       /* True if -H is present.  Output EXPORT header */
  int v_flag = 0;       /* Verbose */
  int noMoreFlags;      /* True if -- has been seen. */
  FILE *report;         /* Send progress reports to this, if not NULL */

  noMoreFlags = 0;
  for(i=1; i<argc; i++){
    if( argv[i][0]=='-' && !noMoreFlags ){
      switch( argv[i][1] ){
        case 'h':   h_flag = 1;   break;
        case 'H':   H_flag = 1;   break;
        case 'v':   v_flag = 1;   break;
        case 'd':   doc_flag = 1; proto_static = 1; break;
        case 'l':   proto_static = 1; break;
        case 'f':   AddParameters(i, &argc, &argv); break;
        case '-':   noMoreFlags = 1;   break;
#ifdef DEBUG
        case '!':   i++;  debugMask = strtol(argv[i],0,0); break;
#endif
        default:    Usage(argv[0],argv[i]); return 1;
      }
    }else{
      pFile = CreateInFile(argv[i],&nErr);
      if( pFile ){
        if( pFileList ){
          pTail->pNext = pFile;
          pTail = pFile;
        }else{
          pFileList = pTail = pFile;
        }
      }
    }
  }
  if( h_flag && H_flag ){
    h_flag = 0;
  }
  if( v_flag ){
    report = (h_flag || H_flag) ? stderr : stdout;
  }else{
    report = 0;
  }
  if( nErr>0 ){
    return nErr;
  }
  for(pFile=pFileList; pFile; pFile=pFile->pNext){
    char *zFile;

    zFilename = pFile->zSrc;
    if( zFilename==0 ) continue;
    zFile = ReadFile(zFilename);
    if( zFile==0 ){
      fprintf(stderr,"Can't read input file \"%s\"\n",zFilename);
      nErr++;
      continue;
    }
    if( strncmp(zFile,zTopLine,nTopLine)==0 ){
      pFile->zSrc = 0;
    }else{
      if( report ) fprintf(report,"Reading %s...\n",zFilename);
      pList = TokenizeFile(zFile,&pFile->idTable);
      if( pList ){
        nErr += ParseFile(pList,pFile->flags);
        FreeTokenList(pList);
      }else if( zFile[0]==0 ){
        fprintf(stderr,"Input file \"%s\" is empty.\n", zFilename);
        nErr++;
      }else{
        fprintf(stderr,"Errors while processing \"%s\"\n", zFilename);
        nErr++;
      }
    }
    if( !doc_flag ) SafeFree(zFile);
    if( doc_flag ) PrintModuleRecord(zFile,zFilename);
  }
  if( nErr>0 ){
    return nErr;
  }
#ifdef DEBUG
  if( debugMask & DECL_DUMP ){
    DumpDeclList();
    return nErr;
  }
#endif
  if( doc_flag ){
    DocumentationDump();
    return nErr;
  }
  zFilename = "--internal--";
  pList = TokenizeFile(zInit,0);
  if( pList==0 ){
    return nErr+1;
  }
  ParseFile(pList,PS_Interface);
  FreeTokenList(pList);
  if( h_flag || H_flag ){
    nErr += MakeGlobalHeader(H_flag);
  }else{
    for(pFile=pFileList; pFile; pFile=pFile->pNext){
      if( pFile->zSrc==0 ) continue;
      nErr += MakeHeader(pFile,report,0);
    }
  }
  return nErr;
}
#endif
