gas/strstr.c

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