xref: /titanic_51/usr/src/lib/libast/common/tm/tmpoff.c (revision 37714ae43602c675f9dc59b070bfdf9fa702872c)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2008 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  * Glenn Fowler
25  * AT&T Bell Laboratories
26  *
27  * time conversion support
28  */
29 
30 #include <ast.h>
31 #include <tm.h>
32 
33 /*
34  * n is minutes west of UTC
35  *
36  * append p and SHHMM part of n to s
37  * where S is + or -
38  *
39  * n ignored if n==d
40  * end of s is returned
41  */
42 
43 char*
44 tmpoff(register char* s, size_t z, register const char* p, register int n, int d)
45 {
46 	register char*	e = s + z;
47 
48 	while (s < e && (*s = *p++))
49 		s++;
50 	if (n != d && s < e)
51 	{
52 		if (n < 0)
53 		{
54 			n = -n;
55 			*s++ = '+';
56 		}
57 		else
58 			*s++ = '-';
59 		s += sfsprintf(s, e - s, "%02d%02d", n / 60, n % 60);
60 	}
61 	return s;
62 }
63