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92b3138b83
Updated dependencies: * GMP 6.2.1 * ISL 0.24 * MPL 1.2.1 * MPFR 4.1.0 The dependencies were pulled in by running the ./contrib/download_prerequisites script and then manually removing the symbolic links and archives, and renaming the directories (i.e mv isl-0.24 to isl)
41 lines
953 B
C
41 lines
953 B
C
/* Simple implementation of strstr for systems without it.
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This function is in the public domain. */
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/*
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@deftypefn Supplemental char* strstr (const char *@var{string}, const char *@var{sub})
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This function searches for the substring @var{sub} in the string
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@var{string}, not including the terminating null characters. A pointer
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to the first occurrence of @var{sub} is returned, or @code{NULL} if the
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substring is absent. If @var{sub} points to a string with zero
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length, the function returns @var{string}.
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@end deftypefn
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*/
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#include <stddef.h>
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extern char *strchr (const char *, int);
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extern int strncmp (const void *, const void *, size_t);
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extern size_t strlen (const char *);
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char *
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strstr (const char *s1, const char *s2)
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{
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const char *p = s1;
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const size_t len = strlen (s2);
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if (!len)
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return s1;
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for (; (p = strchr (p, *s2)) != 0; p++)
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{
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if (strncmp (p, s2, len) == 0)
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return (char *)p;
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}
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return (0);
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}
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