1 /* strindex.c - Find if one string appears as a substring of another string,
2 without regard to case. */
4 /* Copyright (C) 2000 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Bash is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Bash. If not, see <http://www.gnu.org/licenses/>.
25 #include <chartypes.h>
29 /* Determine if s2 occurs in s1. If so, return a pointer to the
30 match in s1. The compare is case insensitive. This is a
31 case-insensitive strstr(3). */
37 register int i, l, len, c;
39 c = TOLOWER ((unsigned char)s2[0]);
42 for (i = 0; (len - i) >= l; i++)
43 if ((TOLOWER ((unsigned char)s1[i]) == c) && (strncasecmp (s1 + i, s2, l) == 0))
44 return ((char *)s1 + i);