tail head cat sleep
QR code linking to this page

Manual Pages  — STRSTR

NAME

strstr – locate a substring in a string

CONTENTS

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <string.h>

char *
strstr(const char *big, const char *little);

char *
strcasestr(const char *big, const char *little);

char *
strnstr(const char *big, const char *little, size_t len);
#include <string.h>
#include <xlocale.h>

char *
strcasestr_l(const char *big, const char *little, locale_t loc);

DESCRIPTION

The strstr() function locates the first occurrence of the null-terminated string little in the null-terminated string big.

The strcasestr() function is similar to strstr(), but ignores the case of both strings.

The strcasestr_l() function does the same as strcasestr() but takes an explicit locale rather than using the current locale.

The strnstr() function locates the first occurrence of the null-terminated string little in the string big, where not more than len characters are searched. Characters that appear after a ‘\0’ character are not searched. Since the strnstr() function is a FreeBSD specific API, it should only be used when portability is not a concern.

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.

EXAMPLES

The following sets the pointer ptr to the "Bar Baz" portion of largestring:
const char *largestring = "Foo Bar Baz";
const char *smallstring = "Bar";
char *ptr;

ptr = strstr(largestring, smallstring);

The following sets the pointer ptr to NULL, because only the first 4 characters of largestring are searched:

const char *largestring = "Foo Bar Baz";
const char *smallstring = "Bar";
char *ptr;

ptr = strnstr(largestring, smallstring, 4);

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 ISO/IEC 9899:1990 ("ISO C90").

STRSTR (3) October 11, 2001

tail head cat sleep
QR code linking to this page


Please direct any comments about this manual page service to Ben Bullock. Privacy policy.

Unix...best if used before: Tue Jan 19 03:14:08 GMT 2038