Import Dev86src-0.16.6.tar.gzv0.16.6

1 files changed, 1427 insertions, 0 deletions

diff --git a/cpp/cpp.c b/cpp/cpp.c
new file mode 100644
index 0000000..542a709
--- /dev/null
+++ b/cpp/cpp.c
@@ -0,0 +1,1427 @@
+
+#include <stdio.h>
+#include <string.h>
+#include <malloc.h>
+#ifdef __STDC__
+#include <stdlib.h>
+#endif
+#include "cc.h"
+
+#define CPP_DEBUG 0	/* LOTS of junk to stdout. */
+
+/*
+ * This file comprises the 'guts' of a C preprocessor.
+ *
+ * Functions exported from this file:
+ *   gettok() Returns the next token from the source
+ *            curword contains the text of the token
+ *
+ * Variables
+ *   curword  Contains the text of the last token parsed.
+ *   curfile  Currently open primary file
+ *   c_fname  Name of file being parsed
+ *   c_lineno Current line number in file being parsed.
+ *
+ *   in_asm   Control flag for the kind of tokens you want (C or assembler)
+ *   ansi_c   Control flag to change the preprocessor for Ansi C.
+ *
+ */
+
+char curword[WORDSIZE];
+int  in_asm = 0;
+int  ansi_c = 0;
+
+FILE * curfile;
+char * c_fname;
+int    c_lineno = 0;
+
+typedef int int_type;		/* Used for preprocessor expressions */
+static int  curtok = 0;		/* Used for preprocessor expressions */
+
+static int    fi_count = 0;
+static FILE * saved_files[MAX_INCLUDE];
+static char * saved_fname[MAX_INCLUDE];
+static int    saved_lines[MAX_INCLUDE];
+
+static char * def_ptr = 0;
+static char * def_start = 0;
+static struct define_item * def_ref = 0;
+
+static int    def_count =0;
+static char * saved_def[MAX_DEFINE];
+static char * saved_start[MAX_DEFINE];
+static long   saved_unputc[MAX_DEFINE];
+static struct define_item * saved_ref[MAX_DEFINE];
+ 
+static long unputc = 0;
+
+static int last_char = '\n';
+static int in_preproc = 0;
+static int dont_subst = 0;
+static int quoted_str = 0;
+
+static int if_count = 0;
+static int if_false = 0;
+static int if_has_else = 0;
+static int if_hidden = 0;
+static int if_stack = 0;
+
+struct arg_store {
+   char * name;
+   char * value;
+   int  in_define;
+};
+
+static int  chget _P((void));
+static void unchget _P((int));
+static int  gettok_nosub _P((void));
+static int  get_onetok _P((void));
+static int  pgetc _P((void));
+static int  do_preproc _P((void));
+static int  do_proc_copy_hashline _P((void));
+static int  do_proc_if _P((int));
+static void do_proc_include _P((void));
+static void do_proc_define _P((void));
+static void do_proc_undef _P((void));
+static void do_proc_else _P((void));
+static void do_proc_endif _P((void));
+static void do_proc_tail _P((void));
+static int  get_if_expression _P((void));
+static int_type get_expression _P((int));
+static int_type get_exp_value _P((void));
+static int  gen_substrings _P((char *, char *, int));
+static char * insert_substrings _P((char *, struct arg_store *, int));
+
+int
+gettok()
+{
+   int ch;
+
+   for(;;) 
+   {
+      /* Normal C Preprocessor decoding */
+      if (in_asm) {
+	 *curword = 0;
+	 if (quoted_str) ch = chget();
+	 else            ch = pgetc();
+	 if (ch > 0xFF || ch == EOF) return ch;
+
+	 if(!quoted_str && 
+	       ( (ch >= 'A' && ch <= 'Z')
+	       || (ch >= 'a' && ch <= 'z')
+	       || ch == '_' || ch == '$' ) ) {
+	    unchget(ch);
+	 }
+	 else
+	 {
+	    curword[0] = ch;
+	    curword[1] = 0;
+	    if (quoted_str==2)
+	       quoted_str=1;
+	    else {
+	       if (ch == '"') {
+		  quoted_str = !quoted_str;
+		  return '"';
+	       }
+	       if (quoted_str == 1 && ch == '\\')
+		  quoted_str = 2;
+	       else if (quoted_str && ch == '\n') {
+		  quoted_str = 0;
+		  unchget(ch);
+		  return '\n';
+	       }
+	    }
+
+	    if (ch == '\n') continue;
+	    return TK_STR;
+	 }
+      }
+
+      /* Tokenised C-Preprocessing */
+      if (!quoted_str)
+      {
+	 ch = get_onetok();
+
+	 /* Erase meaningless backslashes */
+	 if( ch == '\\' ) {
+	    int ch1 = chget();
+	    if (ch1 == '\n') continue;
+	    unchget(ch1);
+	 }
+
+	 if( ch == '"' )
+	    quoted_str = 1;
+	 return ch;
+      }
+
+      /* Special for quoted strings */
+      *curword = 0;
+      ch = chget();
+      if( ch == EOF ) return ch;
+
+      *curword = ch;
+      curword[1] = '\0';
+
+      if( quoted_str == 2 ) {
+	 quoted_str = 1;
+	 return TK_STR;
+      }
+
+      if( ch == '"' )
+      {
+	 /* Found a terminator '"' check for ansi continuation */
+	 while( (ch = pgetc()) <= ' ' && ch != EOF) ;
+	 if( ch == '"' ) continue;
+	 quoted_str = 0;
+	 unchget(ch);
+
+	 *curword = '"';
+	 curword[1] = '\0';
+	 return '"';
+      }
+      if( ch == '\n' ) {
+	 quoted_str = 0;
+	 unchget(ch);
+	 return ch;
+      }
+      if( ch != '\\' ) return TK_STR;
+
+      /* Deal with backslash; NB this could interpret all the \X codes */
+      ch = chget();
+
+      if( ch != '\n' ) { quoted_str++; unchget(ch); return TK_STR; }
+   }
+}
+
+static int
+gettok_nosub()
+{ int rv; dont_subst++; rv=get_onetok(); dont_subst--; return rv; }
+
+static int
+get_onetok()
+{
+   char * p;
+   int state;
+   int ch, cc;
+
+Try_again:
+   *(p=curword) = '\0';
+   state=cc=ch=0;
+
+   while( (ch = pgetc()) != EOF)
+   {
+      if( ch > ' ' ) break;
+      if( in_preproc && ch == '\n') break;
+      if( (!in_preproc) && in_asm && (ch == ' ' || ch == '\t') ) break;
+   }
+   if( ch > 0xFF ) return ch;
+   for(;;)
+   {
+      switch(state)
+      {
+      case 0: if( (ch >= 'A' && ch <= 'Z')
+               || (ch >= 'a' && ch <= 'z')
+               || ch == '_' || ch == '$' )
+                 state = 1;
+              else if(ch == '0')
+                 state = 2;
+              else if(ch >= '1' && ch <= '9')
+                 state = 5;
+              else
+                 goto break_break;
+              break;
+      case 1: if( (ch >= '0' && ch <= '9')
+               || (ch >= 'A' && ch <= 'Z')
+               || (ch >= 'a' && ch <= 'z')
+               || ch == '_' || ch == '$' )
+                 break;
+              else
+                 goto break_break;
+      case 2: if( ch >= '0' && ch <= '7')
+                 state = 3;
+              else if( ch == 'x' || ch == 'X' )
+                 state = 4;
+              else
+                 goto break_break;
+              break;
+      case 3: if( ch >= '0' && ch <= '7')
+                 break;
+              else
+                 goto break_break;
+      case 4: if( (ch >= '0' && ch <= '9')
+               || (ch >= 'A' && ch <= 'F')
+               || (ch >= 'a' && ch <= 'f') )
+                 break;
+              else
+                 goto break_break;
+      case 5:
+      case 6: if( ch >= '0' && ch <= '9')
+                 ;
+              else if( ch == '.' && state != 6 )
+                 state = 6;
+              else if( ch == 'e' || ch == 'E' )
+                 state = 7;
+              else
+                 goto break_break;
+              break;
+      case 7: if( ch == '+' || ch == '-' )
+                 break;
+              state = 8;
+              /* FALLTHROUGH */
+      case 8: if( ch >= '0' && ch <= '9')
+                 break;
+              else
+                 goto break_break;
+      }
+      if( cc < WORDSIZE-1 ) *p++ = ch;	/* Clip to WORDSIZE */
+      *p = '\0'; cc++;
+      ch = pgetc();
+   }
+break_break:
+   if( state == 1 )
+   {
+      struct define_item * ptr;
+      unchget(ch);
+      if( !dont_subst
+         && (ptr = read_entry(0, curword)) != 0
+	 && !ptr->in_use
+	 )
+      {
+	 if ( def_count >= MAX_DEFINE ) {
+	    cerror("Preprocessor recursion overflow");
+	    goto oops_keep_going;
+	 } else
+         /* Add in the arguments if they're there */
+	 if( ptr->arg_count >= 0 )
+	 {
+	    /* We have arguments to process so lets do so. */
+	    if( !gen_substrings(ptr->name, ptr->value, ptr->arg_count) )
+	       goto oops_keep_going;
+	    def_ref = ptr;
+	    ptr->in_use = 1;
+	 }
+	 else if (ptr->value[0])
+	 {
+            saved_ref[def_count] = def_ref;
+            saved_def[def_count] = def_ptr;
+            saved_start[def_count] = def_start;
+            saved_unputc[def_count] = unputc;
+            def_count++;
+            unputc = 0;
+	    def_ref = ptr;
+            def_ptr = ptr->value;
+	    def_start = 0;
+	    ptr->in_use = 1;
+	 }
+         goto Try_again;
+      }
+oops_keep_going:
+      if( !in_preproc )
+      {
+         struct token_trans *p;
+	 if( p=is_ckey(curword, cc) )
+	    return p->token;
+      }
+      return TK_WORD;
+   }
+   if( state >= 2 )
+   {
+      if( state < 6 )
+      {
+         if( ch == 'l' || ch == 'L' )
+         {
+            if( cc < WORDSIZE-1 ) *p++ = ch;	/* Clip to WORDSIZE */
+            *p = '\0'; cc++;
+         }
+         else unchget(ch);
+         return TK_NUM;
+      }
+      unchget(ch);
+      return TK_FLT;
+   }
+
+   /* More tokeniser for C like stuff */
+   if(!in_asm || in_preproc)
+   {
+      /* Quoted char (NOT strings!) */
+      if (ch == '\'' )
+      {
+	 *p++ = ch; ch = chget();
+	 for(;;)
+	 {
+	    if( cc < WORDSIZE-1 ) *p++ = ch;	/* Clip to WORDSIZE */
+	    *p = '\0'; cc++;
+	    if( ch == '\'' || ch == '\n' ) break;
+
+	    if( ch == '\\' )
+	    {
+	       ch = chget();
+	       if( cc < WORDSIZE-1 ) *p++ = ch;	/* Clip to WORDSIZE */
+	       *p = '\0'; cc++;
+	    }
+	    ch = chget();
+	 }
+	 ch = TK_QUOT;
+      }
+      /* Composite tokens */
+      if( ch > ' ' && ch <= '~' )
+      {
+	 struct token_trans *p;
+	 *curword = cc = ch;
+
+	 for(state=1; ; state++)
+	 {
+	    curword[state] = ch = chget();
+	    if( !(p=is_ctok(curword, state+1)) )
+	    {
+	       unchget(ch);
+	       curword[state] = '\0';
+	       return cc;
+	    }
+	    cc=p->token;
+	 }
+      }
+   } else {
+      *curword = ch;
+      curword[1] = 0;
+   }
+   return ch;
+}
+
+static int
+pgetc()
+{
+   int ch, ch1;
+
+   for(;;)
+   {
+      /* This loop is repeated if the current char is not suitable
+	 either because of a comment or a false #if condition
+       */
+
+      ch = chget();
+
+      if( ch == EOF ) return ch;
+      if( in_preproc && ch == '\\' )
+      {
+	 ch1 = chget();
+	 if( ch1 == '\n' ) ch = chget();
+	 else              unchget(ch1);
+      }
+
+      /* Ansi trigraphs -- Ewww, anyway this doesn't work, it needs lots
+       * of 'unchget' space too. */
+      if (ansi_c && ch == '?') {
+	 ch1 = chget();
+	 if (ch1 != '?')
+	    unchget(ch1);
+	 else {
+	    static char trig1[] = "()<>/!'-=";
+	    static char trig2[] = "[]{}\\|^~#";
+	    char * s;
+	    ch1 = chget();
+	    s = strchr(trig1, ch1);
+	    if (s) ch = trig2[s-trig1];
+	    else {
+	       unchget(ch1);
+	       unchget('?');
+	    }
+	 }
+      }
+
+      if( !in_preproc && last_char == '\n' && ch == '#' )
+      {
+	 in_preproc = 1;
+	 ch = do_preproc();
+	 in_preproc = 0;
+	 last_char = '\n';
+	 if(if_false) continue;
+	 return ch;
+      }
+      if( last_char != '\n' || (ch != ' ' && ch != '\t') )
+	 last_char = ch;
+
+      /* Remove comments ... */
+      if( ch != '/' )
+         { if(if_false && !in_preproc) continue; return ch; }
+      ch1 = chget();
+
+      if( ch1 == '/' ) /* Double slash style comments */
+      {
+	 do
+	 {
+	    ch = chget();
+	    if( ch == EOF ) return EOF;
+	    if( ch == '\\' ) {
+	       ch1 = chget();
+	       if( ch1 == EOF ) return EOF;
+	    }
+	 }
+	 while(ch != '\n');
+	 continue;
+      }
+
+      if( ch1 != '*' )
+      {
+	 unchget(ch1);
+	 if(if_false && !in_preproc) continue;
+	 return ch;
+      }
+
+      for(;;)
+      {
+	 if( ch == '*' )
+	 {
+	    ch = chget();
+	    if( ch == EOF ) return EOF;
+	    if( ch == '/' ) break;
+	 }
+	 else ch = chget();
+      }
+      if (ansi_c)
+	 return ' ';	/* If comments become " " */
+
+      /* Comments become nulls */
+   }
+}
+
+static void 
+unchget(ch)
+{
+#if CPP_DEBUG
+   fprintf(stderr, "\b", ch);
+#endif
+   if(ch == EOF) ch=26; /* EOF is pushed back as ^Z */
+   ch &= 0xFF;
+
+   if(unputc&0xFF000000) 
+      cerror("Internal character pushback stack overflow");
+   else       unputc = (unputc<<8) + (ch);
+   if( ch == '\n' ) c_lineno--;
+}
+
+static int 
+chget()
+#if CPP_DEBUG
+{
+   int ch;
+static int last_def = 0;
+static int last_fi = 0;
+   if (last_fi != fi_count)   fprintf(stderr, "<INC%d>", fi_count);
+   if (last_def != def_count) fprintf(stderr, "<DEF%d>", def_count);
+   last_def = def_count; last_fi = fi_count;
+
+   ch = realchget();
+   if (ch == EOF) fprintf(stderr, "<EOF>"); else fprintf(stderr, "%c", ch);
+
+   if (last_def != def_count) fprintf(stderr, "<DEF%d>", def_count);
+   if (last_fi != fi_count)   fprintf(stderr, "<INC%d>", fi_count);
+   last_def = def_count; last_fi = fi_count;
+
+   return ch;
+}
+
+static int 
+realchget()
+#endif
+{
+   int ch;
+   for(;;)
+   {
+      if( unputc )
+      {
+	 if((unputc&0xFF)==26 && in_preproc) return '\n';
+	 ch=(unputc&0xFF); unputc>>=8;
+	 if( ch == 26 ) ch = EOF;
+	 if( ch == '\n' ) c_lineno++;
+	 return ch;
+      }
+
+      if( def_ptr )
+      {
+	 ch = *def_ptr++; if(ch) return (unsigned char)ch;
+	 if( def_start ) free(def_start);
+	 if( def_ref ) def_ref->in_use = 0;
+
+	 def_count--;
+	 def_ref   = saved_ref[def_count];
+	 def_ptr   = saved_def[def_count];
+	 def_start = saved_start[def_count];
+	 unputc    = saved_unputc[def_count];
+	 continue;
+      }
+
+      ch = getc(curfile);
+      if( ch == EOF && fi_count != 0)
+      {
+	 fclose(curfile);
+	 fi_count--;
+	 curfile  = saved_files[fi_count];
+	 if(c_fname) free(c_fname);
+	 c_fname  = saved_fname[fi_count];
+	 c_lineno = saved_lines[fi_count];
+	 ch = '\n'; /* Ensure end of line on end of file */
+      }
+      else if( ch == '\n' ) c_lineno++;
+
+      /* Treat all control characters, except the standard whitespace
+       * characters of TAB and NL as completely invisible. 
+       */
+      if( ch >= 0 && ch < ' ' && ch!='\n' && ch!='\t' && ch!=EOF ) continue;
+
+      if( ch == EOF ) { unchget(ch); return '\n'; } /* Ensure EOL before EOF */
+      return (unsigned char)ch;
+   }
+}
+
+static int
+do_preproc()
+{
+   int val, no_match=0;
+
+   if( (val=get_onetok()) == TK_WORD )
+   {
+      if( strcmp(curword, "ifdef") == 0 )
+         do_proc_if(0);
+      else if( strcmp(curword, "ifndef") == 0 )
+         do_proc_if(1);
+      else if( strcmp(curword, "if") == 0 )
+         do_proc_if(2);
+      else if( strcmp(curword, "elif") == 0 )
+         do_proc_if(3);
+      else if( strcmp(curword, "else") == 0 )
+         do_proc_else();
+      else if( strcmp(curword, "endif") == 0 )
+         do_proc_endif();
+      else if(if_false)
+         no_match=1;
+      else
+      {
+         if( strcmp(curword, "include") == 0 )
+            do_proc_include();
+         else if( strcmp(curword, "define") == 0 )
+            do_proc_define();
+         else if( strcmp(curword, "undef") == 0 )
+            do_proc_undef();
+         else if( strcmp(curword, "error") == 0 )
+            return do_proc_copy_hashline();
+         else if( strcmp(curword, "warning") == 0 )
+            return do_proc_copy_hashline();
+         else if( strcmp(curword, "asm") == 0 ) {
+	    in_asm |= 1;
+            return do_proc_copy_hashline();
+	 } else if( strcmp(curword, "endasm") == 0 ) {
+	    in_asm &= ~1;
+            return do_proc_copy_hashline();
+	 } else 
+	    no_match=1;
+      }
+   }
+   else if( val == '#' )  /* This is a comment, it's used as a marker */
+                          /* for compiler specific header files */
+   {
+      while((val = pgetc()) != '\n');
+   }
+   else no_match=1;
+   
+   if( no_match )
+   {
+      if(!if_false) cerror("Unknown preprocessor directive");
+      while( val != '\n' ) val = pgetc();
+   }
+
+   strcpy(curword, "\n");
+   return '\n';
+}
+
+static int
+do_proc_copy_hashline()
+{
+   int off, ch;
+
+   off = strlen(curword);
+
+   while( (ch=pgetc()) != '\n' )
+   {
+      if( off < WORDSIZE ) curword[off++] = ch;
+   }
+   if( off == WORDSIZE )
+   {
+      cerror("Preprocessor directive too long");
+      curword[WORDSIZE-1] = '\0';
+   }
+   else
+      curword[off] = '\0';
+
+   unchget('\n');
+   return TK_COPY;
+}
+
+static void do_proc_include()
+{
+   int ch, ch1;
+   char * p;
+   FILE * fd;
+
+   ch = get_onetok();
+   if( ch == '<' || ch == '"' )
+   {
+      if( ch == '"' ) ch1 = ch; else ch1 = '>';
+      p = curword;
+      while(p< curword+sizeof(curword)-1)
+      {
+         ch = pgetc();
+         if( ch == '\n' ) break;
+         if( ch == ch1 )
+         {
+            *p = '\0';
+
+            fd = open_include(curword, "r", (ch=='"'));
+            if( fd == 0 )
+               cerror("Cannot open include file");
+	    do { ch = pgetc(); } while(ch == ' ' || ch == '\t'); unchget(ch);
+            do_proc_tail();
+
+            if( fd )
+            {
+               saved_files[fi_count] = curfile;
+               saved_fname[fi_count] = c_fname;
+               saved_lines[fi_count] = c_lineno;
+               fi_count++;
+
+               curfile = fd;
+               c_fname = malloc(strlen(curword)+1);
+               if( c_fname == 0 ) cfatal("Preprocessor out of memory");
+               strcpy(c_fname, curword);
+               c_lineno = 1;
+            }
+            return;
+         }
+         *p++ = ch;
+      }
+   }
+   cerror("Bad #include command");
+   while(ch != '\n') ch = pgetc();
+   return;
+}
+
+static void do_proc_define()
+{
+   int ch, ch1;
+   struct define_item * ptr, * old_value = 0;
+   int  cc, len;
+   char name[sizeof(curword)];
+
+   if( (ch=gettok_nosub()) == TK_WORD )
+   {
+      strcpy(name, curword);
+      ptr = read_entry(0, name);
+      if(ptr)
+      {
+         set_entry(0, name, (void*)0); /* Unset var */
+         if (ptr->in_use) 
+	    ; /* Eeeek! This shouldn't happen; so just let it leak. */
+	 else
+	    old_value = ptr;
+      }
+      for(ch=ch1=pgetc(); ch == ' ' || ch == '\t' ; ch=pgetc()) ;
+
+      /* If #define with no substitute */
+      if( ch == '\n' )
+      {
+#if CPP_DEBUG
+	 fprintf(stderr, "\n### Define '%s' as null\n", name);
+#endif
+         ptr = malloc(sizeof(struct define_item));
+         if(ptr==0) cfatal("Preprocessor out of memory");
+         ptr->name = set_entry(0, name, ptr);
+         ptr->value[0] = '\0';
+	 ptr->arg_count = -1;
+	 ptr->in_use = 0;
+         ptr->next = 0;
+	 if (old_value) {
+	    if (strcmp(old_value->value, ptr->value) != 0)
+	       cwarn("#define redefined macro");
+	    free(old_value);
+	 }
+         return;
+      }
+      len = WORDSIZE; 
+      ptr = malloc(sizeof(struct define_item) + WORDSIZE);
+      if(ptr==0) cfatal("Preprocessor out of memory");
+      ptr->value[cc=0] = 0;
+
+      /* Add in arguments */
+      if( ch1 == '(' )
+      {
+         ptr->arg_count=0;
+	 for(;;)
+	 {
+	    ch=gettok_nosub();
+	    if( ptr->arg_count==0 && ch == ')' ) break;
+	    if( ch == TK_WORD ) 
+	    {
+	       if( cc+strlen(curword)+4 >= len)
+	       {
+		  len = cc + WORDSIZE;
+		  ptr = (struct define_item *) realloc(ptr, sizeof(struct define_item) + len);
+		  if(ptr==0) cfatal("Preprocessor out of memory");
+	       }
+	       if( cc+strlen(curword) < len)
+	       {
+		  strcpy(ptr->value+cc, curword);
+		  cc+=strlen(curword);
+		  strcpy(ptr->value+cc, ",");
+		  cc++;
+		  ptr->arg_count++;
+		  ch=gettok_nosub();
+		  if( ch == ')' ) break;
+		  if( ch == ',' ) continue;
+	       }
+	    }
+            cerror("Bad #define command");
+	    free(ptr);
+            while(ch != '\n') ch = pgetc();
+	    set_entry(0, name, (void*)old_value); /* Return var to old. */
+	    return;
+	 }
+	 while((ch=pgetc())==' ' || ch=='\t');
+      }
+      else ptr->arg_count = -1;
+
+      /* And the substitution string */
+      while(ch != '\n')
+      {
+         if( cc+4 > len )
+         {
+            len = cc + WORDSIZE;
+            ptr = (struct define_item *) realloc(ptr, sizeof(struct define_item) + len);
+            if(ptr==0) cfatal("Preprocessor out of memory");
+         }
+         ptr->value[cc++] = ch;
+         ch = pgetc();
+      }
+      ptr->value[cc++] = ' ';	/* Byte of lookahead for recursive macros */
+      ptr->value[cc++] = 0;
+
+#if CPP_DEBUG
+      if (ptr->arg_count<0)
+	 fprintf(stderr, "\n### Define '%s' as '%s'\n", 
+		 name, ptr->value);
+      else
+	 fprintf(stderr, "\n### Define '%s' as %d args '%s'\n", 
+		 name, ptr->arg_count, ptr->value);
+#endif
+
+      /* Clip to correct size and save */
+      ptr = (struct define_item *) realloc(ptr, sizeof(struct define_item) + cc);
+      ptr->name = set_entry(0, name, ptr);
+      ptr->in_use = 0;
+      ptr->next = 0;
+
+      if (old_value) {
+	 if (strcmp(old_value->value, ptr->value) != 0)
+	    cwarn("#define redefined macro");
+	 free(old_value);
+      }
+   }
+   else cerror("Bad #define command");
+   while(ch != '\n') ch = pgetc();
+}
+
+static void do_proc_undef()
+{
+   int ch;
+   struct define_item * ptr;
+   if( (ch=gettok_nosub()) == TK_WORD )
+   {
+      ptr = read_entry(0, curword);
+      if(ptr)
+      {
+         set_entry(0, curword, (void*)0); /* Unset var */
+         if (ptr->in_use) 
+	    ; /* Eeeek! This shouldn't happen; so just let it leak. */
+	 else
+	    free(ptr);
+      }
+      do_proc_tail();
+   }
+   else
+   {
+      cerror("Bad #undef command");
+      while(ch != '\n') ch = pgetc();
+   }
+}
+
+static int do_proc_if(type)
+int type;
+{
+   int ch = 0;
+   if( type == 3 )
+   {
+      if( if_count == 0 )
+	 cerror("#elif without matching #if");
+      else
+      {
+	 if( if_has_else )
+	    cerror("#elif following #else for one #if");
+	 if( if_has_else || if_false != 1 )
+	 {
+	    if_false=2;
+	    while(ch != '\n') ch = pgetc();
+	    return 0;
+	 }
+	 if_false=0;
+      }
+      if_has_else = 0;
+   }
+   if(if_false)
+   {
+      if( type != 3 ) if_hidden++;
+      do_proc_tail();
+   }
+   else
+   {
+      if( type != 3 )
+      {
+         if_count++;
+         if_stack <<= 1;
+         if_stack |= if_has_else;
+         if_has_else = 0;
+      }
+      if(type > 1)
+      {
+	 ch = get_if_expression();
+	 if_false=!ch;
+      }
+      else
+      {
+         ch = gettok_nosub();
+         if( ch == TK_WORD )
+         {
+            do_proc_tail();
+            if_false = (read_entry(0, curword) == 0);
+            if(type == 1) if_false = !if_false;
+         }
+         else
+         {
+            cerror("Bad #if command");
+            if_false = 0;
+            while(ch != '\n') ch = pgetc();
+         }
+      }
+   }
+   return 0;
+}
+
+static void do_proc_else()
+{
+   if( if_hidden == 0 )
+   {
+      if( if_count == 0 )
+         cerror("#else without matching #if");
+      else
+         if_false = (if_false^1);
+      if( if_has_else )
+         cerror("Multiple #else's for one #if");
+      if_has_else = 1;
+   }
+   do_proc_tail();
+}
+
+static void do_proc_endif()
+{
+   if( if_hidden )
+      if_hidden--;
+   else
+   {
+      if( if_count == 0 )
+         cerror("Unmatched #endif");
+      else
+      {
+         if_count--;
+         if_false=0;
+         if_has_else = (if_stack&1);
+         if_stack >>=1;
+      }
+   }
+   do_proc_tail();
+}
+
+static void
+do_proc_tail()
+{
+   int ch, flg=1;
+   while((ch = pgetc()) != '\n') if(ch > ' ')
+   {
+      if (!if_false && flg)
+         cwarn("Unexpected text following preprocessor command");
+      flg=0;
+   }
+}
+
+static int
+get_if_expression()
+{
+   int value = get_expression(0);
+
+   if (curtok != '\n')
+      do_proc_tail();
+
+   return value;
+}
+
+static int_type
+get_expression(prio)
+int prio;
+{
+   int_type lvalue;
+   int_type rvalue;
+   int no_op = 0;
+
+   curtok = get_onetok();
+   lvalue = get_exp_value();
+
+   do
+   {
+      switch(curtok)
+      {
+	 case '*': case '/': case '%':
+	    if (prio >= 10) return lvalue;
+	    break;
+	 case '+': case '-':
+	    if (prio >= 9) return lvalue;
+	    break;
+	 case TK_RIGHT_OP: case TK_LEFT_OP:
+	    if (prio >= 8) return lvalue;
+	    break;
+	 case '<': case '>': case TK_LE_OP: case TK_GE_OP:
+	    if (prio >= 7) return lvalue;
+	    break;
+	 case TK_EQ_OP: case TK_NE_OP:
+	    if (prio >= 6) return lvalue;
+	    break;
+	 case '&':
+	    if (prio >= 5) return lvalue;
+	    break;
+	 case '^':
+	    if (prio >= 4) return lvalue;
+	    break;
+	 case '|':
+	    if (prio >= 3) return lvalue;
+	    break;
+	 case TK_AND_OP:
+	    if (prio >= 2) return lvalue;
+	    break;
+	 case TK_OR_OP:
+	    if (prio >= 1) return lvalue;
+	    break;
+      }
+      switch(curtok)
+      {
+	 case '*':
+	    rvalue = get_expression(10);
+	    lvalue *= rvalue;
+	    break;
+	 case '/':
+	    rvalue = get_expression(10);
+	    if (rvalue)
+	       lvalue /= rvalue;
+	    break;
+	 case '%':
+	    rvalue = get_expression(10);
+	    if (rvalue)
+	       lvalue %= rvalue;
+	    break;
+	 case '+':
+	    rvalue = get_expression(9);
+	    lvalue += rvalue;
+	    break;
+	 case '-':
+	    rvalue = get_expression(9);
+	    lvalue -= rvalue;
+	    break;
+	 case TK_RIGHT_OP:
+	    rvalue = get_expression(8);
+	    lvalue >>= rvalue;
+	    break;
+	 case TK_LEFT_OP:
+	    rvalue = get_expression(8);
+	    lvalue <<= rvalue;
+	    break;
+	 case '<':
+	    rvalue = get_expression(7);
+	    lvalue = (lvalue < rvalue);
+	    break;
+	 case '>':
+	    rvalue = get_expression(7);
+	    lvalue = (lvalue > rvalue);
+	    break;
+	 case TK_LE_OP:
+	    rvalue = get_expression(7);
+	    lvalue = (lvalue <= rvalue);
+	    break;
+	 case TK_GE_OP:
+	    rvalue = get_expression(7);
+	    lvalue = (lvalue >= rvalue);
+	    break;
+	 case TK_EQ_OP:
+	    rvalue = get_expression(6);
+	    lvalue = (lvalue == rvalue);
+	    break;
+	 case TK_NE_OP:
+	    rvalue = get_expression(6);
+	    lvalue = (lvalue != rvalue);
+	    break;
+	 case '&':
+	    rvalue = get_expression(5);
+	    lvalue = (lvalue & rvalue);
+	    break;
+	 case '^':
+	    rvalue = get_expression(4);
+	    lvalue = (lvalue ^ rvalue);
+	    break;
+	 case '|':
+	    rvalue = get_expression(3);
+	    lvalue = (lvalue | rvalue);
+	    break;
+	 case TK_AND_OP:
+	    rvalue = get_expression(2);
+	    lvalue = (lvalue && rvalue);
+	    break;
+	 case TK_OR_OP:
+	    rvalue = get_expression(1);
+	    lvalue = (lvalue || rvalue);
+	    break;
+
+	 case '?': /* XXX: To add */
+
+	 default:
+	    no_op = 1;
+      }
+   }
+   while(prio == 0 && !no_op);
+
+   return lvalue;
+}
+
+static int_type
+get_exp_value()
+{
+   int_type value = 0;
+   int sign = 1;
+
+   if (curtok == '!') {
+      curtok = get_onetok();
+      return !get_exp_value();
+   }
+   if (curtok == '~') {
+      curtok = get_onetok();
+      return ~get_exp_value();
+   }
+
+   while (curtok == '+' || curtok == '-') {
+      if (curtok == '-') sign = -sign;
+      curtok = get_onetok();
+   }
+
+   if (curtok == TK_NUM) {
+      value = strtoul(curword, (void*)0, 0);
+      curtok = get_onetok();
+   } else if (curtok == TK_QUOT) {
+      value = curword[1];
+      if (value == '\\') {
+	 if (curword[2] >= '0' && curword[2] <= '7') {
+	    value = curword[2] - '0';
+	    if (curword[3] >= '0' && curword[3] <= '7') {
+	       value = (value<<3) + curword[3] - '0';
+	       if (curword[4] >= '0' && curword[4] <= '7') {
+		  value = (value<<3) + curword[4] - '0';
+	       }
+	    }
+	 } else switch(curword[2]) {
+	    case 'n': value = '\n'; break;
+	    case 'f': value = '\f'; break;
+	    case 't': value = '\t'; break;
+	    default:  value = curword[2]; break;
+	 }
+      }
+#ifdef NATIVE_CPP
+      value = (char) value; /* Fix range */
+#elif SIGNED_CHAR
+      value = (signed char) value;
+#else
+      value = (unsigned char) value;
+#endif
+      curtok = get_onetok();
+   } else if (curtok == TK_WORD) {
+      value = 0;
+      if (strcmp("defined", curword) == 0) {
+	 curtok = gettok_nosub();
+	 if (curtok == '(' && gettok_nosub() != TK_WORD)
+	    cerror("'defined' keyword requires argument");
+	 else {
+	    value = (read_entry(0, curword) != 0);
+	    if (curtok == '(' && gettok_nosub() != ')')
+	       cerror("'defined' keyword requires closing ')'");
+	    else
+	       curtok = get_onetok();
+	 }
+      }
+      else
+	 curtok = get_onetok();
+
+   } else if (curtok == '(') {
+      value = get_expression(0);
+      if (curtok == ')')
+	 curtok = get_onetok();
+      else
+	 curtok = '$';
+   }
+
+   return sign<0 ? -value: value;
+}
+
+static int 
+gen_substrings(macname, data_str, arg_count)
+char * macname;
+char * data_str;
+int arg_count;
+{
+   char * mac_text = 0;
+   struct arg_store *arg_list;
+   int ac, ch, cc, len;
+   int args_found = 1;	/* An empty arg still counts as one. */
+
+   int paren_count = 0;
+   int in_quote = 0;
+
+   arg_list = malloc(sizeof(struct arg_store) * arg_count);
+   memset(arg_list, 0, sizeof(struct arg_store) * arg_count);
+
+   for(ac=0; *data_str && ac < arg_count; data_str++) {
+      if( *data_str == ',' ) { ac++; continue; }
+
+      if (arg_list[ac].name == 0) cc = len = 0;
+
+      if (cc+2 >= len) {
+	 len += 20;
+	 arg_list[ac].name = realloc(arg_list[ac].name, len);
+      }
+      arg_list[ac].name[cc++] = *data_str;
+      arg_list[ac].name[cc] = 0;
+   }
+
+   while((ch = chget()) <= ' ' && ch != EOF ) ;
+
+   if( ch != '(' )
+   {
+      /* Macro name used without arguments, ignore substitution */
+      unchget(ch);
+      /* unchget(' '); 	.* This is needed incase the next thing is a word */
+      			/* to stop these two words being stuck together. */
+      return 0;
+   }
+
+   for(;;) {
+      if ((ch = chget()) == EOF) break;
+      if(in_quote == 2) {
+	 in_quote = 1;
+      } else if (in_quote) {
+	 if ( ch == '"' ) in_quote = 0;
+	 if ( ch == '\\') in_quote = 2;
+      } else {
+	 if ( ch == '(' ) paren_count++;
+	 if ( ch == '"' ) in_quote = 1;
+	 if (paren_count == 0 && ch == ',' ) {
+	    args_found++; continue;
+	 }
+	 if ( ch == ')' ) {
+	    if (paren_count == 0) break;
+	    paren_count--;
+	 }
+      }
+      /* Too many args; ignore rest */
+      if (args_found > arg_count ) continue;
+      ac = args_found-1;
+      if (arg_list[ac].value == 0) {
+	 cc = len = 0;
+	 arg_list[ac].in_define = def_count;
+      }
+
+      if (cc+2 >= len) {
+	 len += 20;
+	 arg_list[ac].value = realloc(arg_list[ac].value, len);
+      }
+      if (ch == '\n' && cc>0 && arg_list[ac].value[cc-1] == '\\' ) {
+	 /* Humm, ok */
+	 arg_list[ac].value[--cc] = 0;
+	 ch = ' ';
+	 if (!ansi_c) continue;
+      }
+
+      if (ch == '\n' && cc>0 && arg_list[ac].value[cc-1] == '\n' ) {
+	 cerror("Unquoted newline in macro arguments");
+	 break;
+      }
+
+      arg_list[ac].value[cc++] = ch;
+      arg_list[ac].value[cc] = 0;
+   }
+
+   if( arg_count != args_found )
+      cerror("Incorrect number of macro arguments");
+
+   mac_text = insert_substrings(data_str, arg_list, arg_count);
+
+   if (arg_list) {
+      for (ac=0; ac<arg_count; ac++) {
+	 if (arg_list[ac].name) free(arg_list[ac].name);
+	 if (arg_list[ac].value) free(arg_list[ac].value);
+      }
+      free(arg_list);
+   }
+
+   saved_ref[def_count] = def_ref;
+   saved_def[def_count] = def_ptr;
+   saved_start[def_count] = def_start;
+   saved_unputc[def_count] = unputc;
+   def_count++;
+   unputc = 0;
+   def_ptr = mac_text;
+   def_start = mac_text;
+#if CPP_DEBUG
+   fprintf(stderr, "\n### <DEF%d='%s'>\n", def_count, mac_text);
+#endif
+   return 1;
+}
+
+static char * 
+insert_substrings(data_str, arg_list, arg_count)
+char * data_str;
+struct arg_store *arg_list;
+int arg_count;
+{
+   int ac, ch;
+   char * p, * s;
+   char * rv = 0;
+   int    len = 0;
+   int    cc = 0;
+   int    in_quote = 0;
+   int    ansi_stringize = 0;
+
+#if CPP_DEBUG
+   fprintf(stderr, "\n### Macro substitution in '%s'\n", data_str);
+   for (ac=0; ac<arg_count; ac++) {
+      fprintf(stderr, "### Argument %d (%s) = '%s'\n", 
+	 ac+1, arg_list[ac].name, arg_list[ac].value);
+   }
+#endif
+
+   rv = malloc(4); *rv = 0; len = 4;
+
+   while(*data_str) {
+      p = curword;
+
+      if (ansi_c) {
+	 if (in_quote == 2)
+	    in_quote = 1;
+	 else if (in_quote) {
+	    if (*data_str == '"') in_quote = 0;
+	    if (*data_str == '\\') in_quote = 2;
+	 } else {
+	    if (*data_str == '"') in_quote = 1;
+	 }
+      }
+
+      if (!in_quote) for(;;) {
+	 ch = *data_str;
+         if( (ch >= '0' && ch <= '9')
+	  || (ch >= 'A' && ch <= 'Z')
+	  || (ch >= 'a' && ch <= 'z')
+	  || ch == '_' || ch == '$' )
+	    *p++ = *data_str++;
+	 else
+	    break;
+      }
+
+      if (p == curword) {
+	 /* Ansi Stringize and concat */
+	 if (*data_str == '#' && ansi_c) {
+	    if (data_str[1] == '#') {
+	       while(cc>0 && (rv[cc-1] == ' ' || rv[cc-1] == '\t'))
+		  cc--;
+	       data_str+=2;
+	       while(*data_str == ' ' || *data_str == '\t')
+		  data_str++;
+	       if (*data_str == 0) { /* Hummm */
+		  data_str--;
+		  cerror("'##' operator at end of macro");
+	       }
+	       continue;
+	    }
+	    data_str++;
+	    ansi_stringize = 1;
+	    continue;
+	 }
+
+	 if (ansi_stringize) {
+	    ansi_stringize = 0;
+	    cerror("'#' operator should be followed by a macro argument name");
+	 }
+
+	 /* Other characters ... */
+	 if (cc+2 > len) { len += 20; rv = realloc(rv, len); }
+	 rv[cc++] = *data_str++;
+	 continue;
+      }
+      *p = 0; s = curword;
+      for (ac=0; ac<arg_count; ac++) {
+	 if (*curword == arg_list[ac].name[0] &&
+	     strcmp(curword, arg_list[ac].name) == 0)
+	 {
+	    s = arg_list[ac].value;
+
+	    /* Ansi stringize operation, this is very messy! */
+	    if (ansi_stringize) {
+	       if (arg_list[ac].in_define) {
+		  struct define_item * ptr;
+                  if ((ptr = read_entry(0, s)) &&  
+		       ptr->arg_count == -1) {
+		     s = ptr->value;
+		  }
+	       }
+
+	       rv[cc++] = '"';
+	       while(*s == ' ' || *s == '\t') s++;
+	       while (*s) {
+		  if (cc+4 > len) { len += 20; rv = realloc(rv, len); }
+		  if (*s == '"') rv[cc++] = '\\';
+		  rv[cc++] = *s++;
+	       }
+	       while(cc>0 && (rv[cc-1] == ' ' || rv[cc-1] == '\t'))
+		  cc--;
+	       rv[cc++] = '"';
+	       rv[cc++] = 0;
+	       ansi_stringize = 0;
+	       s = "";
+	       break;
+	    }
+
+	    break;
+	 }
+      }
+
+      if (ansi_stringize) {
+	 ansi_stringize = 0;
+	 cerror("'#' operator should be followed by a macro argument name");
+      }
+
+      if (cc+2+strlen(s) > len) { len += strlen(s)+20; rv = realloc(rv, len); }
+      strcpy(rv+cc, s);
+      cc = strlen(rv);
+   }
+
+   rv[cc] = 0;
+   return rv;
+}