21 lines
523 B
C
21 lines
523 B
C
#undef __STRICT_ANSI__
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#include <_ansi.h>
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#include <string.h>
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/*
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* Find the first occurrence of find in s, where the search is limited to the
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* first slen characters of s.
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*/
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char *
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strnstr(const char *haystack, const char *needle, size_t haystack_len)
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{
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size_t needle_len = strnlen(needle, haystack_len);
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if (needle_len < haystack_len || !needle[needle_len]) {
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char *x = memmem(haystack, haystack_len, needle, needle_len);
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if (x && !memchr(haystack, 0, x - haystack))
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return x;
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}
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return NULL;
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}
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