1STRSTR(3bsd) LOCAL STRSTR(3bsd)
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4 strnstr — locate a substring in a string
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7 Utility functions from BSD systems (libbsd, -lbsd)
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10 #include <string.h>
11 (See libbsd(7) for include usage.)
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13 char *
14 strnstr(const char *big, const char *little, size_t len);
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17 The strnstr() function locates the first occurrence of the null-termi‐
18 nated string little in the string big, where not more than len characters
19 are searched. Characters that appear after a ‘\0’ character are not
20 searched. Since the strnstr() function is a FreeBSD specific API, it
21 should only be used when portability is not a concern.
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24 If little is an empty string, big is returned; if little occurs nowhere
25 in big, NULL is returned; otherwise a pointer to the first character of
26 the first occurrence of little is returned.
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29 The following sets the pointer ptr to NULL, because only the first 4
30 characters of largestring are searched:
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32 const char *largestring = "Foo Bar Baz";
33 const char *smallstring = "Bar";
34 char *ptr;
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36 ptr = strnstr(largestring, smallstring, 4);
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39 strstr(3), strcasestr(3), memchr(3), memmem(3), strchr(3), strcspn(3),
40 strpbrk(3), strrchr(3), strsep(3), strspn(3), strtok(3), wcsstr(3)
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42BSD October 11, 2001 BSD