usr/src/lib/libast/common/string/strnacmp.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 /*
  25  * ccmapc(c, CC_NATIVE, CC_ASCII) and strncmp
  26  */
  27
  28 #include <ast.h>
  29 #include <ccode.h>
  30
  31 #if _lib_strnacmp
  32
  33 NoN(strnacmp)
  34
  35 #else
  36
  37 #include <ctype.h>
  38
  39 int
  40 strnacmp(const char* a, const char* b, size_t n)
  41 {
  42 #if CC_NATIVE == CC_ASCII
  43         return strncmp(a, b, n);
  44 #else
  45         register unsigned char* ua = (unsigned char*)a;
  46         register unsigned char* ub = (unsigned char*)b;
  47         register unsigned char* ue;
  48         register unsigned char* m;
  49         register int            c;
  50         register int            d;
  51
  52         m = ccmap(CC_NATIVE, CC_ASCII);
  53         ue = ua + n;
  54         while (ua < ue)
  55         {
  56                 c = m[*ua++];
  57                 if (d = c - m[*ub++])
  58                         return d;
  59                 if (!c)
  60                         return 0;
  61         }
  62         return 0;
  63 #endif
  64 }
  65
  66 #endif