source: trunk/minix/lib/ansi/strftime.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a
File size: 3.7 KB
Line 
1/*
2 * strftime - convert a structure to a string, controlled by an argument
3 */
4/* $Header: /cvsup/minix/src/lib/ansi/strftime.c,v 1.1.1.1 2005/04/21 14:56:06 beng Exp $ */
5
6#include <time.h>
7#include "loc_time.h"
8
9/* The width can be -1 in both s_prnt() as in u_prnt(). This
10 * indicates that as many characters as needed should be printed.
11 */
12static char *
13s_prnt(char *s, size_t maxsize, const char *str, int width)
14{
15 while (width > 0 || (width < 0 && *str)) {
16 if (!maxsize) break;
17 *s++ = *str++;
18 maxsize--;
19 width--;
20 }
21 return s;
22}
23
24static char *
25u_prnt(char *s, size_t maxsize, unsigned val, int width)
26{
27 int c;
28
29 c = val % 10;
30 val = val / 10;
31 if (--width > 0 || (width < 0 && val != 0))
32 s = u_prnt(s, (maxsize ? maxsize - 1 : 0), val, width);
33 if (maxsize) *s++ = c + '0';
34 return s;
35}
36
37size_t
38strftime(char *s, size_t maxsize,
39 const char *format, const struct tm *timeptr)
40{
41 size_t n;
42 char *firsts, *olds;
43
44 if (!format) return 0;
45
46 _tzset(); /* for %Z conversion */
47 firsts = s;
48 while (maxsize && *format) {
49 while (maxsize && *format && *format != '%') {
50 *s++ = *format++;
51 maxsize--;
52 }
53 if (!maxsize || !*format) break;
54 format++;
55
56 olds = s;
57 switch (*format++) {
58 case 'a':
59 s = s_prnt(s, maxsize,
60 _days[timeptr->tm_wday], ABB_LEN);
61 maxsize -= s - olds;
62 break;
63 case 'A':
64 s = s_prnt(s, maxsize, _days[timeptr->tm_wday], -1);
65 maxsize -= s - olds;
66 break;
67 case 'b':
68 s = s_prnt(s, maxsize,
69 _months[timeptr->tm_mon], ABB_LEN);
70 maxsize -= s - olds;
71 break;
72 case 'B':
73 s = s_prnt(s, maxsize, _months[timeptr->tm_mon], -1);
74 maxsize -= s - olds;
75 break;
76 case 'c':
77 n = strftime(s, maxsize,
78 "%a %b %d %H:%M:%S %Y", timeptr);
79 if (n) maxsize -= n;
80 else maxsize = 0;
81 s += n;
82 break;
83 case 'd':
84 s = u_prnt(s, maxsize, timeptr->tm_mday, 2);
85 maxsize -= s - olds;
86 break;
87 case 'H':
88 s = u_prnt(s, maxsize, timeptr->tm_hour, 2);
89 maxsize -= s - olds;
90 break;
91 case 'I':
92 s = u_prnt(s, maxsize,
93 (timeptr->tm_hour + 11) % 12 + 1, 2);
94 maxsize -= s - olds;
95 break;
96 case 'j':
97 s = u_prnt(s, maxsize, timeptr->tm_yday + 1, 3);
98 maxsize -= s - olds;
99 break;
100 case 'm':
101 s = u_prnt(s, maxsize, timeptr->tm_mon + 1, 2);
102 maxsize -= s - olds;
103 break;
104 case 'M':
105 s = u_prnt(s, maxsize, timeptr->tm_min, 2);
106 maxsize -= s - olds;
107 break;
108 case 'p':
109 s = s_prnt(s, maxsize,
110 (timeptr->tm_hour < 12) ? "AM" : "PM", 2);
111 maxsize -= s - olds;
112 break;
113 case 'S':
114 s = u_prnt(s, maxsize, timeptr->tm_sec, 2);
115 maxsize -= s - olds;
116 break;
117 case 'U':
118 s = u_prnt(s, maxsize, /* ??? */
119 (timeptr->tm_yday + 7 - timeptr->tm_wday) / 7, 2);
120 maxsize -= s - olds;
121 break;
122 case 'w':
123 s = u_prnt(s, maxsize, timeptr->tm_wday, 1);
124 maxsize -= s - olds;
125 break;
126 case 'W':
127 s = u_prnt(s, maxsize, /* ??? */
128 (timeptr->tm_yday+7-(timeptr->tm_wday+6)%7)/7,2);
129 maxsize -= s - olds;
130 break;
131 case 'x':
132 n = strftime(s, maxsize, "%a %b %d %Y", timeptr);
133 if (n) maxsize -= n;
134 else maxsize = 0;
135 s += n;
136 break;
137 case 'X':
138 n = strftime(s, maxsize, "%H:%M:%S", timeptr);
139 if (n) maxsize -= n;
140 else maxsize = 0;
141 s += n;
142 break;
143 case 'y':
144 s = u_prnt(s, maxsize, timeptr->tm_year % 100, 2);
145 maxsize -= s - olds;
146 break;
147 case 'Y':
148 s = u_prnt(s, maxsize, timeptr->tm_year + YEAR0, -1);
149 maxsize -= s - olds;
150 break;
151 case 'Z':
152 s = s_prnt(s, maxsize,
153 _tzname[(timeptr->tm_isdst > 0)], -1);
154 maxsize -= s - olds;
155 break;
156 case '%':
157 *s++ = '%';
158 maxsize--;
159 break;
160 default:
161 /* A conversion error. Leave the loop. */
162 while (*format) format++;
163 break;
164 }
165
166 }
167 if (maxsize) {
168 *s = '\0';
169 return s - firsts;
170 }
171 return 0; /* The buffer is full */
172}
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