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[thirdparty/gcc.git] / libiberty / strstr.c
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1/* Simple implementation of strstr for systems without it.
2 This function is in the public domain. */
3
4/*
5
aaa5f039 6@deftypefn Supplemental char* strstr (const char *@var{string}, const char *@var{sub})
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aaa5f039 8This function searches for the substring @var{sub} in the string
e922f978 9@var{string}, not including the terminating null characters. A pointer
7f8fa05d 10to the first occurrence of @var{sub} is returned, or @code{NULL} if the
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11substring is absent. If @var{sub} points to a string with zero
12length, the function returns @var{string}.
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aaa5f039 14@end deftypefn
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16
17*/
18
19
20/* FIXME: The above description is ANSI compiliant. This routine has not
21 been validated to comply with it. -fnf */
22
23char *
24strstr (s1, s2)
25 char *s1, *s2;
26{
27 register char *p = s1;
28 extern char *strchr ();
29 extern int strncmp ();
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30#if __GNUC__ >= 2
31 extern __SIZE_TYPE__ strlen (const char *);
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32#endif
33 register int len = strlen (s2);
34
35 for (; (p = strchr (p, *s2)) != 0; p++)
36 {
37 if (strncmp (p, s2, len) == 0)
38 {
39 return (p);
40 }
41 }
42 return (0);
43}