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strnacmp.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * ccmapc(c, CC_NATIVE, CC_ASCII) and strncmp
 */

#include <ast.h>
#include <ccode.h>

#if _lib_strnacmp

NoN(strnacmp)

#else

#include <ctype.h>

int
strnacmp(const char* a, const char* b, size_t n)
{
#if CC_NATIVE == CC_ASCII
      return strncmp(a, b, n);
#else
      register unsigned char* ua = (unsigned char*)a;
      register unsigned char* ub = (unsigned char*)b;
      register unsigned char* ue;
      register unsigned char* m;
      register int            c;
      register int            d;

      m = ccmap(CC_NATIVE, CC_ASCII);
      ue = ua + n;
      while (ua < ue)
      {
            c = m[*ua++];
            if (d = c - m[*ub++])
                  return d;
            if (!c)
                  return 0;
      }
      return 0;
#endif
}

#endif

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