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 * Glenn Fowler
25 * AT&T Bell Laboratories
26 *
27 * time conversion support
28 */
29
30#include <ast.h>
31#include <tm.h>
32#include <ctype.h>
33
34/*
35 * return minutes offset from absolute timezone expression
36 *
37 *	[[-+]hh[:mm[:ss]]]
38 *	[-+]hhmm
39 *
40 * if e is non-null then it points to the first unrecognized char in s
41 * d returned if no offset in s
42 */
43
44int
45tmgoff(register const char* s, char** e, int d)
46{
47	register int	n = d;
48	int		east;
49	const char*	t = s;
50
51	if ((east = *s == '+') || *s == '-')
52	{
53		s++;
54		if (isdigit(*s) && isdigit(*(s + 1)))
55		{
56			n = ((*s - '0') * 10 + (*(s + 1) - '0')) * 60;
57			s += 2;
58			if (*s == ':')
59				s++;
60			if (isdigit(*s) && isdigit(*(s + 1)))
61			{
62				n += ((*s - '0') * 10 + (*(s + 1) - '0'));
63				s += 2;
64				if (*s == ':')
65					s++;
66				if (isdigit(*s) && isdigit(*(s + 1)))
67					s += 2;
68			}
69			if (east)
70				n = -n;
71			t = s;
72		}
73	}
74	if (e)
75		*e = (char*)t;
76	return n;
77}
78