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/*
FUNCTION
<<strncasecmp>>---case-insensitive character string compare
INDEX
strncasecmp
SYNOPSIS
#include <strings.h>
int strncasecmp(const char *<[a]>, const char * <[b]>, size_t <[length]>);
DESCRIPTION
<<strncasecmp>> compares up to <[length]> characters
from the string at <[a]> to the string at <[b]> in a
case-insensitive manner.
RETURNS
If <<*<[a]>>> sorts lexicographically after <<*<[b]>>> (after
both are converted to lowercase), <<strncasecmp>> returns a
number greater than zero. If the two strings are equivalent,
<<strncasecmp>> returns zero. If <<*<[a]>>> sorts
lexicographically before <<*<[b]>>>, <<strncasecmp>> returns a
number less than zero.
PORTABILITY
<<strncasecmp>> is in the Berkeley Software Distribution.
<<strncasecmp>> requires no supporting OS subroutines. It uses
tolower() from elsewhere in this library.
QUICKREF
strncasecmp
*/
#include <strings.h>
#include <ctype.h>
int
strncasecmp (const char *s1,
const char *s2,
size_t n)
{
int d = 0;
for ( ; n != 0; n--)
{
const int c1 = tolower(*s1++);
const int c2 = tolower(*s2++);
if (((d = c1 - c2) != 0) || (c2 == '\0'))
break;
}
return d;
}
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