62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
/*
|
|
FUNCTION
|
|
<<strncasecmp>>---case-insensitive character string compare
|
|
|
|
INDEX
|
|
strncasecmp
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <strings.h>
|
|
int strncasecmp(const char *<[a]>, const char * <[b]>, size_t <[length]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <strings.h>
|
|
int strncasecmp(<[a]>, <[b]>, <[length]>)
|
|
char *<[a]>;
|
|
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
|
|
_DEFUN (strncasecmp, (s1, s2, n),
|
|
_CONST char *s1 _AND
|
|
_CONST char *s2 _AND
|
|
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;
|
|
}
|