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1.1 nbrk 1: /*
2: * Copyright (c) 1989, 1993
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the University nor the names of its contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #include <sys/types.h>
31: #include <sys/time.h>
32: #include <tzfile.h>
33: #include <string.h>
34:
35: static const char *afmt[] = {
36: "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
37: };
38: static const char *Afmt[] = {
39: "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
40: "Saturday",
41: };
42: static const char *bfmt[] = {
43: "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
44: "Oct", "Nov", "Dec",
45: };
46: static const char *Bfmt[] = {
47: "January", "February", "March", "April", "May", "June", "July",
48: "August", "September", "October", "November", "December",
49: };
50:
51: static size_t gsize;
52: static char *pt;
53: static int _add(const char *);
54: static int _conv(int, int, int);
55: static int _secs(const struct tm *);
56: static size_t _fmt(const char *, const struct tm *);
57:
58: size_t
59: strftime(s, maxsize, format, t)
60: char *s;
61: size_t maxsize;
62: const char *format;
63: const struct tm *t;
64: {
65:
66: pt = s;
67: if ((gsize = maxsize) < 1)
68: return(0);
69: if (_fmt(format, t)) {
70: *pt = '\0';
71: return(maxsize - gsize);
72: }
73: return(0);
74: }
75:
76: static size_t
77: _fmt(format, t)
78: const char *format;
79: const struct tm *t;
80: {
81: for (; *format; ++format) {
82: if (*format == '%')
83: switch(*++format) {
84: case '\0':
85: --format;
86: break;
87: case 'A':
88: if (t->tm_wday < 0 || t->tm_wday > 6)
89: return(0);
90: if (!_add(Afmt[t->tm_wday]))
91: return(0);
92: continue;
93: case 'a':
94: if (t->tm_wday < 0 || t->tm_wday > 6)
95: return(0);
96: if (!_add(afmt[t->tm_wday]))
97: return(0);
98: continue;
99: case 'B':
100: if (t->tm_mon < 0 || t->tm_mon > 11)
101: return(0);
102: if (!_add(Bfmt[t->tm_mon]))
103: return(0);
104: continue;
105: case 'b':
106: case 'h':
107: if (t->tm_mon < 0 || t->tm_mon > 11)
108: return(0);
109: if (!_add(bfmt[t->tm_mon]))
110: return(0);
111: continue;
112: case 'C':
113: if (!_fmt("%a %b %e %H:%M:%S %Y", t))
114: return(0);
115: continue;
116: case 'c':
117: if (!_fmt("%m/%d/%y %H:%M:%S", t))
118: return(0);
119: continue;
120: case 'D':
121: if (!_fmt("%m/%d/%y", t))
122: return(0);
123: continue;
124: case 'd':
125: if (!_conv(t->tm_mday, 2, '0'))
126: return(0);
127: continue;
128: case 'e':
129: if (!_conv(t->tm_mday, 2, ' '))
130: return(0);
131: continue;
132: case 'H':
133: if (!_conv(t->tm_hour, 2, '0'))
134: return(0);
135: continue;
136: case 'I':
137: if (!_conv(t->tm_hour % 12 ?
138: t->tm_hour % 12 : 12, 2, '0'))
139: return(0);
140: continue;
141: case 'j':
142: if (!_conv(t->tm_yday + 1, 3, '0'))
143: return(0);
144: continue;
145: case 'k':
146: if (!_conv(t->tm_hour, 2, ' '))
147: return(0);
148: continue;
149: case 'l':
150: if (!_conv(t->tm_hour % 12 ?
151: t->tm_hour % 12 : 12, 2, ' '))
152: return(0);
153: continue;
154: case 'M':
155: if (!_conv(t->tm_min, 2, '0'))
156: return(0);
157: continue;
158: case 'm':
159: if (!_conv(t->tm_mon + 1, 2, '0'))
160: return(0);
161: continue;
162: case 'n':
163: if (!_add("\n"))
164: return(0);
165: continue;
166: case 'p':
167: if (!_add(t->tm_hour >= 12 ? "PM" : "AM"))
168: return(0);
169: continue;
170: case 'R':
171: if (!_fmt("%H:%M", t))
172: return(0);
173: continue;
174: case 'r':
175: if (!_fmt("%I:%M:%S %p", t))
176: return(0);
177: continue;
178: case 'S':
179: if (!_conv(t->tm_sec, 2, '0'))
180: return(0);
181: continue;
182: case 's':
183: if (!_secs(t))
184: return(0);
185: continue;
186: case 'T':
187: case 'X':
188: if (!_fmt("%H:%M:%S", t))
189: return(0);
190: continue;
191: case 't':
192: if (!_add("\t"))
193: return(0);
194: continue;
195: case 'U':
196: if (!_conv((t->tm_yday + 7 - t->tm_wday) / 7,
197: 2, '0'))
198: return(0);
199: continue;
200: case 'W':
201: if (!_conv((t->tm_yday + 7 -
202: (t->tm_wday ? (t->tm_wday - 1) : 6))
203: / 7, 2, '0'))
204: return(0);
205: continue;
206: case 'w':
207: if (!_conv(t->tm_wday, 1, '0'))
208: return(0);
209: continue;
210: case 'x':
211: if (!_fmt("%m/%d/%y", t))
212: return(0);
213: continue;
214: case 'y':
215: if (!_conv((t->tm_year + TM_YEAR_BASE)
216: % 100, 2, '0'))
217: return(0);
218: continue;
219: case 'Y':
220: if (!_conv(t->tm_year + TM_YEAR_BASE, 4, '0'))
221: return(0);
222: continue;
223: /*
224: case 'Z':
225: if (!t->tm_zone || !_add(t->tm_zone))
226: return(0);
227: continue;
228: */
229: case '%':
230: /*
231: * X311J/88-090 (4.12.3.5): if conversion char is
232: * undefined, behavior is undefined. Print out the
233: * character itself as printf(3) does.
234: */
235: default:
236: break;
237: }
238: if (!gsize--)
239: return(0);
240: *pt++ = *format;
241: }
242: return(gsize);
243: }
244:
245: static int
246: _secs(t)
247: const struct tm *t;
248: {
249: static char buf[15];
250: time_t s;
251: char *p;
252: struct tm tmp;
253:
254: /* Make a copy, mktime(3) modifies the tm struct. */
255: tmp = *t;
256: s = mktime(&tmp);
257: for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10)
258: *p-- = s % 10 + '0';
259: return(_add(++p));
260: }
261:
262: static int
263: _conv(n, digits, pad)
264: int n, digits, pad;
265: {
266: static char buf[10];
267: char *p;
268:
269: for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits)
270: *p-- = n % 10 + '0';
271: while (p > buf && digits-- > 0)
272: *p-- = pad;
273: return(_add(++p));
274: }
275:
276: static int
277: _add(str)
278: const char *str;
279: {
280: for (;; ++pt, --gsize) {
281: if (!gsize)
282: return(0);
283: if (!(*pt = *str++))
284: return(1);
285: }
286: }