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STRSTR(3) Library Functions Manual STRSTR(3)

strstr, strcasestrlocate a substring in a string

#include <string.h>
char *
strstr(const char *big, const char *little);
char *
strcasestr(const char *big, const char *little);

The strstr() function locates the first occurrence of the NUL-terminated string little in the NUL-terminated string big.
The strcasestr() function is similar to strstr() but ignores the case of both strings.

If little is an empty string, big is returned; if little occurs nowhere in big, NULL is returned; otherwise a pointer to the first character of the first occurrence of little is returned.

memchr(3), memmem(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strtok(3), wcsstr(3)

The strstr() function conforms to ANSI X3.159-1989 (“ANSI C89”).

The strstr() function first appeared in 4.3BSD-Reno. The strcasestr() function appeared in glibc 2.1, was reimplemented for FreeBSD 4.5 and ported to OpenBSD 3.8.
May 11, 2016 OpenBSD-current