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5.33 strncmp—character string compare

Synopsis 

     #include <string.h>
     int strncmp(const char *a, const char * b, size_t length);

Description
strncmp compares up to length characters from the string at a to the string at b.
Returns
If *a sorts lexicographically after *b, strncmp returns a number greater than zero. If the two strings are equivalent, strncmp returns zero. If *a sorts lexicographically before *b, strncmp returns a number less than zero.
Portability
strncmp is ANSI C.

strncmp requires no supporting OS subroutines.