newlib-cygwin/newlib/libc/string/strncasecmp.c

54 lines
1.2 KiB
C
Raw Normal View History

2000-02-18 03:39:52 +08:00
/*
FUNCTION
<<strncasecmp>>---case-insensitive character string compare
2000-02-18 03:39:52 +08:00
INDEX
strncasecmp
SYNOPSIS
#include <strings.h>
2000-02-18 03:39:52 +08:00
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
2000-02-18 03:39:52 +08:00
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>
2000-02-18 03:39:52 +08:00
#include <ctype.h>
int
strncasecmp (const char *s1,
const char *s2,
2000-02-18 03:39:52 +08:00
size_t n)
{
int d = 0;
for ( ; n != 0; n--)
2000-02-18 03:39:52 +08:00
{
const int c1 = tolower(*s1++);
const int c2 = tolower(*s2++);
if (((d = c1 - c2) != 0) || (c2 == '\0'))
break;
2000-02-18 03:39:52 +08:00
}
return d;
2000-02-18 03:39:52 +08:00
}