STRSTR(3)						   BSD Library Functions Manual 						 STRSTR(3)

NAME

     strstr, strcasestr, strnstr -- locate a substring in a string

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 charac-
     ters are searched.  Characters that appear after a '' 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'').

BSD
								 October 11, 2001							       BSD