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
44 int
tmgoff(register const char * s,char ** e,int d)45 tmgoff(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