NAME
strstr, strcasestr
— locate a substring in a
string
SYNOPSIS
#include
<string.h>
char *
strstr(const
char *big, const char
*little);
char *
strcasestr(const
char *big, const char
*little);
DESCRIPTION
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.
RETURN VALUES
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.
SEE ALSO
memchr(3), memmem(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strtok(3), wcsstr(3)
STANDARDS
The strstr() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
HISTORY
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.