5.35 strnstr—find string segment

Synopsis

#include <string.h>
size_t strnstr(const char *s1, const char *s2, size_t n);

Description
Locates the first occurrence in the string pointed to by s1 of the sequence of limited to the n characters in the string pointed to by s2

Returns
Returns a pointer to the located string segment, or a null pointer if the string s2 is not found. If s2 points to a string with zero length, s1 is returned.

Portability
strnstr is a BSD extension.

strnstr requires no supporting OS subroutines.