1STRSTR(3)                  Linux Programmer's Manual                 STRSTR(3)
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NAME

6       strstr - locate a substring
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SYNOPSIS

9       #include <string.h>
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11       char *strstr(const char *haystack, const char *needle);
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13       #define _GNU_SOURCE
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15       #include <string.h>
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17       char *strcasestr(const char *haystack, const char *needle);
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DESCRIPTION

20       The  strstr() function finds the first occurrence of the substring nee‐
21       dle in the string haystack.  The terminating `\0'  characters  are  not
22       compared.
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24       The  strcasestr()  function  is  like strstr(), but ignores the case of
25       both arguments.
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RETURN VALUE

28       These functions return a pointer to the beginning of the substring,  or
29       NULL if the substring is not found.
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BUGS

32       Early  versions  of  Linux  libc (like 4.5.26) would not allow an empty
33       needle argument for strstr().  Later versions (like 4.6.27)  work  cor‐
34       rectly, and return haystack when needle is empty.
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CONFORMING TO

37       The  strstr() function conforms to C89 and C99.  The strcasestr() func‐
38       tion is a non-standard extension.
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SEE ALSO

41       index(3), memchr(3), rindex(3), strchr(3),  strcasecmp(3),  strpbrk(3),
42       strsep(3), strspn(3), strtok(3), wcsstr(3), feature_test_macros(7)
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46GNU                               2005-04-05                         STRSTR(3)
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