gcc/scan.c

   1 /* Utility functions for scan-decls and fix-header programs.
   2    Copyright (C) 1993, 1994 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 2, or (at your option) any
   7 later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include "hconfig.h"
  19 #include "system.h"
  20 #include "scan.h"
  21
  22 int lineno = 1;
  23 int source_lineno = 1;
  24 sstring source_filename;
  25
  26 void
  27 make_sstring_space (str, count)
  28      sstring *str;
  29      int count;
  30 {
  31   int cur_pos = str->ptr - str->base;
  32   int cur_size = str->limit - str->base;
  33   int new_size = cur_pos + count + 100;
  34
  35   if (new_size <= cur_size)
  36     return;
  37
  38   if (str->base == NULL)
  39     str->base = xmalloc (new_size);
  40   else
  41     str->base = xrealloc (str->base, new_size);
  42   str->ptr = str->base + cur_size;
  43   str->limit = str->base + new_size;
  44 }
  45
  46 void
  47 sstring_append (dst, src)
  48      sstring *dst;
  49      sstring *src;
  50 {
  51   register char *d, *s;
  52   register int count = SSTRING_LENGTH(src);
  53   MAKE_SSTRING_SPACE(dst, count + 1);
  54   d = dst->ptr;
  55   s = src->base;
  56   while (--count >= 0) *d++ = *s++;
  57   dst->ptr = d;
  58   *d = 0;
  59 }
  60
  61 int
  62 scan_ident (fp, s, c)
  63      register FILE *fp;
  64      register sstring *s;
  65      int c;
  66 {
  67   s->ptr = s->base;
  68   if (ISALPHA(c) || c == '_')
  69     {
  70       for (;;)
  71         {
  72           SSTRING_PUT(s, c);
  73           c = getc (fp);
  74           if (c == EOF || !(ISALNUM(c) || c == '_'))
  75             break;
  76         }
  77     }
  78   MAKE_SSTRING_SPACE(s, 1);
  79   *s->ptr = 0;
  80   return c;
  81 }
  82
  83 int
  84 scan_string (fp, s, init)
  85      register FILE *fp;
  86      register sstring *s;
  87      int init;
  88 {
  89   int c;
  90   for (;;)
  91     {
  92       c = getc (fp);
  93       if (c == EOF || c == '\n')
  94         break;
  95       if (c == init)
  96         {
  97           c = getc (fp);
  98           break;
  99         }
 100       if (c == '\\')
 101         {
 102           c = getc (fp);
 103           if (c == EOF)
 104             break;
 105           if (c == '\n')
 106             continue;
 107         }
 108       SSTRING_PUT(s, c);
 109     }
 110   MAKE_SSTRING_SPACE(s, 1);
 111   *s->ptr = 0;
 112   return c;
 113 }
 114
 115 /* Skip horizontal white spaces (spaces, tabs, and C-style comments).  */
 116
 117 int
 118 skip_spaces (fp, c)
 119      register FILE *fp;
 120      int c;
 121 {
 122   for (;;)
 123     {
 124       if (c == ' ' || c == '\t')
 125         c = getc (fp);
 126       else if (c == '/')
 127         {
 128           c = getc (fp);
 129           if (c != '*')
 130             {
 131               ungetc (c, fp);
 132               return '/';
 133             }
 134           c = getc (fp);
 135           for (;;)
 136             {
 137               if (c == EOF)
 138                 return EOF;
 139               else if (c != '*')
 140                 {
 141                   if (c == '\n')
 142                     source_lineno++, lineno++;
 143                   c = getc (fp);
 144                 }
 145               else if ((c = getc (fp)) == '/')
 146                 return getc (fp);
 147             }
 148         }
 149       else
 150         break;
 151     }
 152   return c;
 153 }
 154
 155 int
 156 read_upto (fp, str, delim)
 157      FILE *fp;
 158      sstring *str;
 159      int delim;
 160 {
 161   int ch;
 162   for (;;)
 163     {
 164       ch = getc (fp);
 165       if (ch == EOF || ch == delim)
 166         break;
 167       SSTRING_PUT(str, ch);
 168     }
 169   MAKE_SSTRING_SPACE(str, 1);
 170   *str->ptr = 0;
 171   return ch;
 172 }
 173
 174 int
 175 get_token (fp, s)
 176      register FILE *fp;
 177      register sstring *s;
 178 {
 179   int c;
 180   s->ptr = s->base;
 181  retry:
 182   c = ' ';
 183   c = skip_spaces (fp, c);
 184   if (c == '\n')
 185     {
 186       source_lineno++;
 187       lineno++;
 188       goto retry;
 189     }
 190   if (c == '#')
 191     {
 192       c = get_token (fp, s);
 193       if (c == INT_TOKEN)
 194         {
 195           source_lineno = atoi (s->base) - 1; /* '\n' will add 1 */
 196           get_token (fp, &source_filename);
 197         }
 198       for (;;)
 199         {
 200           c = getc (fp);
 201           if (c == EOF)
 202             return EOF;
 203           if (c == '\n')
 204             {
 205             source_lineno++;
 206             lineno++;
 207             goto retry;
 208             }
 209         }
 210     }
 211   if (c == EOF)
 212     return EOF;
 213   if (ISDIGIT (c))
 214     {
 215       do
 216         {
 217           SSTRING_PUT(s, c);
 218           c = getc (fp);
 219         } while (c != EOF && ISDIGIT(c));
 220       ungetc (c, fp);
 221       c = INT_TOKEN;
 222       goto done;
 223     }
 224   if (ISALPHA (c) || c == '_')
 225     {
 226       c = scan_ident (fp, s, c);
 227       ungetc (c, fp);
 228       return IDENTIFIER_TOKEN;
 229     }
 230   if (c == '\'' || c == '"')
 231     {
 232       c = scan_string (fp, s, c);
 233       ungetc (c, fp);
 234       return c == '\'' ? CHAR_TOKEN : STRING_TOKEN;
 235     }
 236   SSTRING_PUT(s, c);
 237  done:
 238   MAKE_SSTRING_SPACE(s, 1);
 239   *s->ptr = 0;
 240   return c;
 241 }