/* strindex.c - Find if one string appears as a substring of another string, without regard to case. */ /* Copyright (C) 2000 Free Software Foundation, Inc. This file is part of GNU Bash, the Bourne Again SHell. Bash is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. Bash 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. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Bash; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ #include <config.h> #include <bashansi.h> #include <chartypes.h> #include <stdc.h> /* Determine if s2 occurs in s1. If so, return a pointer to the match in s1. The compare is case insensitive. This is a case-insensitive strstr(3). */ char * strindex (s1, s2) const char *s1; const char *s2; { register int i, l, len, c; c = TOLOWER ((unsigned char)s2[0]); len = strlen (s1); l = strlen (s2); for (i = 0; (len - i) >= l; i++) if ((TOLOWER ((unsigned char)s1[i]) == c) && (strncasecmp (s1 + i, s2, l) == 0)) return ((char *)s1 + i); return ((char *)0); }