xref: /titanic_50/usr/src/lib/libast/common/string/stresc.c (revision 3e14f97f673e8a630f076077de35afdd43dc1587)
1da2e3ebdSchin /***********************************************************************
2da2e3ebdSchin *                                                                      *
3da2e3ebdSchin *               This software is part of the ast package               *
4*3e14f97fSRoger A. Faulkner *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5da2e3ebdSchin *                      and is licensed under the                       *
6da2e3ebdSchin *                  Common Public License, Version 1.0                  *
77c2fbfb3SApril Chin *                    by AT&T Intellectual Property                     *
8da2e3ebdSchin *                                                                      *
9da2e3ebdSchin *                A copy of the License is available at                 *
10da2e3ebdSchin *            http://www.opensource.org/licenses/cpl1.0.txt             *
11da2e3ebdSchin *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12da2e3ebdSchin *                                                                      *
13da2e3ebdSchin *              Information and Software Systems Research               *
14da2e3ebdSchin *                            AT&T Research                             *
15da2e3ebdSchin *                           Florham Park NJ                            *
16da2e3ebdSchin *                                                                      *
17da2e3ebdSchin *                 Glenn Fowler <gsf@research.att.com>                  *
18da2e3ebdSchin *                  David Korn <dgk@research.att.com>                   *
19da2e3ebdSchin *                   Phong Vo <kpv@research.att.com>                    *
20da2e3ebdSchin *                                                                      *
21da2e3ebdSchin ***********************************************************************/
22da2e3ebdSchin #pragma prototyped
23da2e3ebdSchin /*
24da2e3ebdSchin  * Glenn Fowler
25da2e3ebdSchin  * AT&T Research
26da2e3ebdSchin  *
27da2e3ebdSchin  * convert \X character constants in s in place
28da2e3ebdSchin  * the length of the converted s is returned (may have embedded \0's)
29da2e3ebdSchin  */
30da2e3ebdSchin 
31da2e3ebdSchin #include <ast.h>
32da2e3ebdSchin 
33da2e3ebdSchin int
stresc(register char * s)34da2e3ebdSchin stresc(register char* s)
35da2e3ebdSchin {
36da2e3ebdSchin 	register char*		t;
37da2e3ebdSchin 	register unsigned int	c;
38da2e3ebdSchin 	char*			b;
39da2e3ebdSchin 	char*			e;
40da2e3ebdSchin 
41da2e3ebdSchin 	b = t = s;
42da2e3ebdSchin 	while (c = *s++)
43da2e3ebdSchin 	{
44da2e3ebdSchin 		if (c == '\\')
45da2e3ebdSchin 		{
46da2e3ebdSchin 			c = chresc(s - 1, &e);
47da2e3ebdSchin 			s = e;
48da2e3ebdSchin 			if (c > UCHAR_MAX)
49da2e3ebdSchin 			{
50*3e14f97fSRoger A. Faulkner 				t += mbconv(t, c);
51da2e3ebdSchin 				continue;
52da2e3ebdSchin 			}
53da2e3ebdSchin 		}
54da2e3ebdSchin 		*t++ = c;
55da2e3ebdSchin 	}
56da2e3ebdSchin 	*t = 0;
57da2e3ebdSchin 	return t - b;
58da2e3ebdSchin }
59