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/*

FUNCTION

        <<strncasecmp>>---case-insensitive character string compare

INDEX

        strncasecmp

ANSI_SYNOPSIS

        #include <string.h>

        int strncasecmp(const char *<[a]>, const char * <[b]>, size_t <[length]>);

TRAD_SYNOPSIS

        #include <string.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 <string.h>

#include <ctype.h>

int

_DEFUN (strncasecmp, (s1, s2, n),

        _CONST char *s1 _AND

        _CONST char *s2 _AND

        size_t n)

{

  _CONST unsigned char *ucs1 = (_CONST unsigned char *) s1;

  _CONST unsigned char *ucs2 = (_CONST unsigned char *) s2;

  int d = 0;

  for ( ; n != 0; n--)

    {

      _CONST int c1 = tolower(*ucs1++);

      _CONST int c2 = tolower(*ucs2++);

      if (((d = c1 - c2) != 0) || (c2 == '\0'))

        break;

    }

  return d;

}