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strstr: replace GPLv2-only implementation from Linux by LGPLv2.1 from uclibc

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27393 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-07-11 19:55:18 +00:00
parent 145a89fc0b
commit 6aff55b202
1 changed files with 23 additions and 22 deletions
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45
firmware/libc/strstr.c
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@ -5,34 +5,35 @@
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id: $
*
* Copyright (C) 1991, 1992 Linus Torvalds
* (from linux/lib/string.c)
* Copyright (C) 2002 Manuel Novoa III
* Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, code originally in uclibc
*
****************************************************************************/
#include <string.h>
/**
* strstr - Find the first substring in a %NUL terminated string
* @s1: The string to be searched
* @s2: The string to search for
*/
/* NOTE: This is the simple-minded O(len(s1) * len(s2)) worst-case approach. */
char *strstr(const char *s1, const char *s2)
{
int l1, l2;
register const char *s = s1;
register const char *p = s2;
l2 = strlen(s2);
if (!l2)
return (char *)s1;
l1 = strlen(s1);
while (l1 >= l2) {
l1--;
if (!memcmp(s1, s2, l2))
return (char *)s1;
s1++;
}
return NULL;
do {
if (!*p) {
return (char *) s1;;
}
if (*p == *s) {
++p;
++s;
} else {
p = s2;
if (!*s) {
return NULL;
}
s = ++s1;
}
} while (1);
}