53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
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/* strindex.c - Find if one string appears as a substring of another string,
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without regard to case. */
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/* Copyright (C) 2000
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Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#include <config.h>
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#include "bashansi.h"
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#include <ctype.h>
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#include <stdc.h>
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#ifndef to_upper
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# define to_upper(c) (islower(c) ? toupper(c) : (c))
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# define to_lower(c) (isupper(c) ? tolower(c) : (c))
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#endif
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/* Determine if s2 occurs in s1. If so, return a pointer to the
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match in s1. The compare is case insensitive. This is a
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case-insensitive strstr(3). */
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char *
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strindex (s1, s2)
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const char *s1;
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const char *s2;
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{
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register int i, l, len, c;
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c = to_upper (s2[0]);
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len = strlen (s1);
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l = strlen (s2);
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for (i = 0; (len - i) >= l; i++)
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if ((to_upper (s1[i]) == c) && (strncasecmp (s1 + i, s2, l) == 0))
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return ((char *)s1 + i);
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return ((char *)0);
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}
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