gas/strstr.c

   1 /* strstr - find first occurrence of wanted in s
   2
   3    Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to
  19    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* If your compiler is really ansi, then you don't need this. */
  22
  23 #if __STDC__ != 1
  24
  25 #define SIZET int
  26
  27 #define NULL    0
  28
  29 #include <string.h>
  30
  31 char *                          /* found string, or NULL if none */
  32     strstr(s, wanted)
  33 char *s;
  34 char *wanted;
  35 {
  36         register char *scan;
  37         register SIZET len;
  38         register char firstc;
  39
  40         /*
  41          * The odd placement of the two tests is so "" is findable.
  42          * Also, we inline the first char for speed.
  43          * The ++ on scan has been moved down for optimization.
  44          */
  45         firstc = *wanted;
  46         len = strlen(wanted);
  47         for (scan = s; *scan != firstc || strncmp(scan, wanted, len) != 0; )
  48             if (*scan++ == '\0')
  49                 return(NULL);
  50         return(scan);
  51 } /* strstr() */
  52
  53 #endif /* not __STDC__ */
  54
  55 /* end of strstr.c */