NAME

       strnstr — locate a substring in a string

LIBRARY

       Utility functions from BSD systems (libbsd, -lbsd)

SYNOPSIS

       #include <string.h>
       (See libbsd(7) for include usage.)

       char *
       strnstr(const char *big, const char *little, size_t len);

DESCRIPTION

       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  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

       strstr(3), strcasestr(3), memchr(3), memmem(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3),
       strspn(3), strtok(3), wcsstr(3)

HISTORY

       The strnstr() function originated in FreeBSD.

Debian                                          October 11, 2001                                    strstr(3bsd)