xref: /titanic_44/usr/src/lib/libast/common/string/strvcmp.c (revision a60349c89adffc0902b2353230891d8e7f2b24d9)
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 #include <ast.h>
25 #include <ctype.h>
26 
27 /*
28  * version strcmp(3)
29  */
30 
31 int
32 strvcmp(register const char* a, register const char* b)
33 {
34 	register unsigned long	na;
35 	register unsigned long	nb;
36 
37 	for (;;)
38 	{
39 		if (isdigit(*a) && isdigit(*b))
40 		{
41 			na = nb = 0;
42 			while (isdigit(*a))
43 				na = na * 10 + *a++ - '0';
44 			while (isdigit(*b))
45 				nb = nb * 10 + *b++ - '0';
46 			if (na < nb)
47 				return -1;
48 			if (na > nb)
49 				return 1;
50 		}
51 		else if (*a != *b)
52 			break;
53 		else if (!*a)
54 			return 0;
55 		else
56 		{
57 			a++;
58 			b++;
59 		}
60 	}
61 	if (*a == 0)
62 		return -1;
63 	if (*b == 0)
64 		return 1;
65 	if (*a == '.')
66 		return -1;
67 	if (*b == '.')
68 		return 1;
69 	if (*a == '-')
70 		return -1;
71 	if (*b == '-')
72 		return 1;
73 	return *a < *b ? -1 : 1;
74 }
75