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/*

FUNCTION

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

INDEX

        strcasecmp

ANSI_SYNOPSIS

        #include <string.h>

        int strcasecmp(const char *<[a]>, const char *<[b]>);

TRAD_SYNOPSIS

        #include <string.h>

        int strcasecmp(<[a]>, <[b]>)

        char *<[a]>;

        char *<[b]>;

DESCRIPTION

        <<strcasecmp>> compares 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), <<strcasecmp>> returns a

        number greater than zero.  If the two strings match,

        <<strcasecmp>> returns zero.  If <<*<[a]>>> sorts

        lexicographically before <<*<[b]>>>, <<strcasecmp>> returns a

        number less than zero.

PORTABILITY

<<strcasecmp>> is in the Berkeley Software Distribution.

<<strcasecmp>> requires no supporting OS subroutines. It uses

tolower() from elsewhere in this library.

QUICKREF

        strcasecmp

*/

#include <string.h>

#include <ctype.h>

int

_DEFUN (strcasecmp, (s1, s2),

        _CONST char *s1 _AND

        _CONST char *s2)

{

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

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

  int d = 0;

  for ( ; ; )

    {

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

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

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

        break;

    }

  return d;

}