strstr(3) mojave man page | unix.com

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 *haystack, const char *needle);

     char *
     strcasestr(const char *haystack, const char *needle);

     char *
     strnstr(const char *haystack, const char *needle, size_t len);

     #include <string.h>
     #include <xlocale.h>

     char *
     strcasestr_l(const char *haystack, const char *needle, locale_t loc);

DESCRIPTION
     The strstr() function locates the first occurrence of the null-terminated string needle in the null-terminated string haystack.

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

     The strnstr() function locates the first occurrence of the null-terminated string needle in the string haystack, where not more than len
     characters 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.

     While the strcasestr() function uses the current locale, the strcasestr_l() function may be passed a locale directly. See xlocale(3) for more
     information.

RETURN VALUES
     If needle is an empty string, haystack is returned; if needle occurs nowhere in haystack, NULL is returned; otherwise a pointer to the first
     character of the first occurrence of needle 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), xlocale(3)

STANDARDS
     The strstr() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD
								 October 11, 2001							       BSD