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STRSTR(3)		     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 ex-
     plicit 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  char-
     acters 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").

HISTORY
     The strnstr() function was introduced by FreeBSD 4.5 and is non-standard.

FreeBSD ports 15.quarterly	October 11, 2001		       STRSTR(3)

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