1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                 Eclipse Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*          http://www.eclipse.org/org/documents/epl-v10.html           *
11*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
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
33NoN(strnacmp)
34
35#else
36
37#include <ctype.h>
38
39int
40strnacmp(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
67