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#include <u.h>
2 
#include <libc.h>
3 
 
4 
#define	TZSIZE	150
5 
static	void	readtimezone(void);
6 
static	int	rd_name(char**, char*);
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static	int	rd_long(char**, long*);
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static
9 
struct
10 
{
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	char	stname[4];
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	char	dlname[4];
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	long	stdiff;
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	long	dldiff;
15 
	long	dlpairs[TZSIZE];
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} timezone;
17 
 
18 
#define SEC2MIN 60L
19 
#define SEC2HOUR (60L*SEC2MIN)
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#define SEC2DAY (24L*SEC2HOUR)
21 
 
22 
/*
23 
 *  days per month plus days/year
24 
 */
25 
static	int	dmsize[] =
26 
{
27 
	365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
29 
static	int	ldmsize[] =
30 
{
31 
	366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
32 
};
33 
 
34 
/*
35 
 *  return the days/month for the given year
36 
 */
37 
static int *
38 
yrsize(int y)
39 
{
40 
	if((y%4) == 0 && ((y%100) != 0 || (y%400) == 0))
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		return ldmsize;
42 
	else
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		return dmsize;
44 
}
45 
 
46 
/*
47 
 * compute seconds since Jan 1 1970 GMT
48 
 * and convert to our timezone.
49 
 */
50 
long
51 
tm2sec(Tm *tm)
52 
{
53 
	long secs;
54 
	int i, yday, year, *d2m;
55 
 
56 
	if(strcmp(tm->zone, "GMT") != 0 && timezone.stname[0] == 0)
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		readtimezone();
58 
	secs = 0;
59 
 
60 
	/*
61 
	 *  seconds per year
62 
	 */
63 
	year = tm->year + 1900;
64 
	for(i = 1970; i < year; i++){
65 
		d2m = yrsize(i);
66 
		secs += d2m[0] * SEC2DAY;
67 
	}
68 
 
69 
	/*
70 
	 *  if mday is set, use mon and mday to compute yday
71 
	 */
72 
	if(tm->mday){
73 
		yday = 0;
74 
		d2m = yrsize(year);
75 
		for(i=0; i<tm->mon; i++)
76 
			yday += d2m[i+1];
77 
		yday += tm->mday-1;
78 
	}else{
79 
		yday = tm->yday;
80 
	}
81 
	secs += yday * SEC2DAY;
82 
 
83 
	/*
84 
	 * hours, minutes, seconds
85 
	 */
86 
	secs += tm->hour * SEC2HOUR;
87 
	secs += tm->min * SEC2MIN;
88 
	secs += tm->sec;
89 
 
90 
	/*
91 
	 * Only handles zones mentioned in /env/timezone,
92 
	 * but things get too ambiguous otherwise.
93 
	 */
94 
	if(strcmp(tm->zone, timezone.stname) == 0)
95 
		secs -= timezone.stdiff;
96 
	else if(strcmp(tm->zone, timezone.dlname) == 0)
97 
		secs -= timezone.dldiff;
98 
	if(secs < 0)
99 
		secs = 0;
100 
	return secs;
101 
}
102 
 
103 
static
104 
void
105 
readtimezone(void)
106 
{
107 
	char buf[TZSIZE*11+30], *p;
108 
	int i;
109 
 
110 
	memset(buf, 0, sizeof(buf));
111 
	i = open("/env/timezone", 0);
112 
	if(i < 0)
113 
		goto error;
114 
	if(read(i, buf, sizeof(buf)) >= sizeof(buf))
115 
		goto error;
116 
	close(i);
117 
	p = buf;
118 
	if(rd_name(&p, timezone.stname))
119 
		goto error;
120 
	if(rd_long(&p, &timezone.stdiff))
121 
		goto error;
122 
	if(rd_name(&p, timezone.dlname))
123 
		goto error;
124 
	if(rd_long(&p, &timezone.dldiff))
125 
		goto error;
126 
	for(i=0; i<TZSIZE; i++) {
127 
		if(rd_long(&p, &timezone.dlpairs[i]))
128 
			goto error;
129 
		if(timezone.dlpairs[i] == 0)
130 
			return;
131 
	}
132 
 
133 
error:
134 
	timezone.stdiff = 0;
135 
	strcpy(timezone.stname, "GMT");
136 
	timezone.dlpairs[0] = 0;
137 
}
138 
 
139 
static int
140 
rd_name(char **f, char *p)
141 
{
142 
	int c, i;
143 
 
144 
	for(;;) {
145 
		c = *(*f)++;
146 
		if(c != ' ' && c != '\n')
147 
			break;
148 
	}
149 
	for(i=0; i<3; i++) {
150 
		if(c == ' ' || c == '\n')
151 
			return 1;
152 
		*p++ = c;
153 
		c = *(*f)++;
154 
	}
155 
	if(c != ' ' && c != '\n')
156 
		return 1;
157 
	*p = 0;
158 
	return 0;
159 
}
160 
 
161 
static int
162 
rd_long(char **f, long *p)
163 
{
164 
	int c, s;
165 
	long l;
166 
 
167 
	s = 0;
168 
	for(;;) {
169 
		c = *(*f)++;
170 
		if(c == '-') {
171 
			s++;
172 
			continue;
173 
		}
174 
		if(c != ' ' && c != '\n')
175 
			break;
176 
	}
177 
	if(c == 0) {
178 
		*p = 0;
179 
		return 0;
180 
	}
181 
	l = 0;
182 
	for(;;) {
183 
		if(c == ' ' || c == '\n')
184 
			break;
185 
		if(c < '0' || c > '9')
186 
			return 1;
187 
		l = l*10 + c-'0';
188 
		c = *(*f)++;
189 
	}
190 
	if(s)
191 
		l = -l;
192 
	*p = l;
193 
	return 0;
194 
}