strcasestr man page on CentOS

strcasestr man page on CentOS

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

NAME
       strstr - locate a substring

SYNOPSIS
       #include <string.h>

       char *strstr(const char *haystack, const char *needle);

       #define _GNU_SOURCE

       #include <string.h>

       char *strcasestr(const char *haystack, const char *needle);

DESCRIPTION
       The  strstr() function finds the first occurrence of the substring nee‐
       dle in the string haystack.  The terminating `\0'  characters  are  not
       compared.

       The  strcasestr()  function  is	like strstr(), but ignores the case of
       both arguments.

RETURN VALUE
       These functions return a pointer to the beginning of the substring,  or
       NULL if the substring is not found.

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

CONFORMING TO
       The  strstr() function conforms to C89 and C99.	The strcasestr() func‐
       tion is a non-standard extension.

SEE ALSO
       index(3), memchr(3), rindex(3), strchr(3),  strcasecmp(3),  strpbrk(3),
       strsep(3), strspn(3), strtok(3), wcsstr(3)

GNU				  2005-04-05			     STRSTR(3)

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