network_cmds-543.200.16.tar.gz
[apple/network_cmds.git] / unbound / compat / strptime.c
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89c4ed63
A
1/** strptime workaround (for oa macos leopard)
2 * This strptime follows the man strptime (2001-11-12)
3 * conforming to SUSv2, POSIX.1-2001
4 *
5 * This very simple version of strptime has no:
6 * - E alternatives
7 * - O alternatives
8 * - Glibc additions
9 * - Does not process week numbers
10 * - Does not properly processes year day
11 *
12 * LICENSE
13 * Copyright (c) 2008, NLnet Labs, Matthijs Mekking
14 * All rights reserved.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions are met:
18 * * Redistributions of source code must retain the above copyright notice,
19 * this list of conditions and the following disclaimer.
20 * * Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * * Neither the name of NLnetLabs nor the names of its
24 * contributors may be used to endorse or promote products derived from this
25 * software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 **/
39
40#include "config.h"
41
42#ifndef HAVE_CONFIG_H
43#include <time.h>
44#endif
45
46#ifndef STRPTIME_WORKS
47
48#define TM_YEAR_BASE 1900
49
50#include <ctype.h>
51#include <string.h>
52
53static const char *abb_weekdays[] = {
54 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL
55};
56static const char *full_weekdays[] = {
57 "Sunday", "Monday", "Tuesday", "Wednesday",
58 "Thursday", "Friday", "Saturday", NULL
59};
60static const char *abb_months[] = {
61 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
62 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", NULL
63};
64static const char *full_months[] = {
65 "January", "February", "March", "April", "May", "June",
66 "July", "August", "September", "October", "November", "December", NULL
67};
68static const char *ampm[] = {
69 "am", "pm", NULL
70};
71
72static int
73match_string(const char **buf, const char **strs)
74{
75 int i = 0;
76
77 for (i = 0; strs[i] != NULL; i++) {
78 int len = strlen(strs[i]);
79 if (strncasecmp (*buf, strs[i], len) == 0) {
80 *buf += len;
81 return i;
82 }
83 }
84 return -1;
85}
86
87static int
88str2int(const char **buf, int max)
89{
90 int ret=0, count=0;
91
92 while (*buf[0] != '\0' && isdigit((unsigned char)*buf[0]) && count<max) {
93 ret = ret*10 + (*buf[0] - '0');
94 (*buf)++;
95 count++;
96 }
97
98 if (!count)
99 return -1;
100 return ret;
101}
102
103/** Converts the character string s to values which are stored in tm
104 * using the format specified by format
105 **/
106char *
107unbound_strptime(const char *s, const char *format, struct tm *tm)
108{
109 int c, ret;
110 int split_year = 0;
111
112 while ((c = *format) != '\0') {
113 /* whitespace, literal or format */
114 if (isspace((unsigned char)c)) { /* whitespace */
115 /** whitespace matches zero or more whitespace characters in the
116 * input string.
117 **/
118 while (isspace((unsigned char)*s))
119 s++;
120 }
121 else if (c == '%') { /* format */
122 format++;
123 c = *format;
124 switch (c) {
125 case '%': /* %% is converted to % */
126 if (*s != c) {
127 return NULL;
128 }
129 s++;
130 break;
131 case 'a': /* weekday name, abbreviated or full */
132 case 'A':
133 ret = match_string(&s, full_weekdays);
134 if (ret < 0)
135 ret = match_string(&s, abb_weekdays);
136 if (ret < 0) {
137 return NULL;
138 }
139 tm->tm_wday = ret;
140 break;
141 case 'b': /* month name, abbreviated or full */
142 case 'B':
143 case 'h':
144 ret = match_string(&s, full_months);
145 if (ret < 0)
146 ret = match_string(&s, abb_months);
147 if (ret < 0) {
148 return NULL;
149 }
150 tm->tm_mon = ret;
151 break;
152 case 'c': /* date and time representation */
153 if (!(s = unbound_strptime(s, "%x %X", tm))) {
154 return NULL;
155 }
156 break;
157 case 'C': /* century number */
158 ret = str2int(&s, 2);
159 if (ret < 0 || ret > 99) { /* must be in [00,99] */
160 return NULL;
161 }
162
163 if (split_year) {
164 tm->tm_year = ret*100 + (tm->tm_year%100);
165 }
166 else {
167 tm->tm_year = ret*100 - TM_YEAR_BASE;
168 split_year = 1;
169 }
170 break;
171 case 'd': /* day of month */
172 case 'e':
173 ret = str2int(&s, 2);
174 if (ret < 1 || ret > 31) { /* must be in [01,31] */
175 return NULL;
176 }
177 tm->tm_mday = ret;
178 break;
179 case 'D': /* equivalent to %m/%d/%y */
180 if (!(s = unbound_strptime(s, "%m/%d/%y", tm))) {
181 return NULL;
182 }
183 break;
184 case 'H': /* hour */
185 ret = str2int(&s, 2);
186 if (ret < 0 || ret > 23) { /* must be in [00,23] */
187 return NULL;
188 }
189 tm->tm_hour = ret;
190 break;
191 case 'I': /* 12hr clock hour */
192 ret = str2int(&s, 2);
193 if (ret < 1 || ret > 12) { /* must be in [01,12] */
194 return NULL;
195 }
196 if (ret == 12) /* actually [0,11] */
197 ret = 0;
198 tm->tm_hour = ret;
199 break;
200 case 'j': /* day of year */
201 ret = str2int(&s, 2);
202 if (ret < 1 || ret > 366) { /* must be in [001,366] */
203 return NULL;
204 }
205 tm->tm_yday = ret;
206 break;
207 case 'm': /* month */
208 ret = str2int(&s, 2);
209 if (ret < 1 || ret > 12) { /* must be in [01,12] */
210 return NULL;
211 }
212 /* months go from 0-11 */
213 tm->tm_mon = (ret-1);
214 break;
215 case 'M': /* minute */
216 ret = str2int(&s, 2);
217 if (ret < 0 || ret > 59) { /* must be in [00,59] */
218 return NULL;
219 }
220 tm->tm_min = ret;
221 break;
222 case 'n': /* arbitrary whitespace */
223 case 't':
224 while (isspace((unsigned char)*s))
225 s++;
226 break;
227 case 'p': /* am pm */
228 ret = match_string(&s, ampm);
229 if (ret < 0) {
230 return NULL;
231 }
232 if (tm->tm_hour < 0 || tm->tm_hour > 11) { /* %I */
233 return NULL;
234 }
235
236 if (ret == 1) /* pm */
237 tm->tm_hour += 12;
238 break;
239 case 'r': /* equivalent of %I:%M:%S %p */
240 if (!(s = unbound_strptime(s, "%I:%M:%S %p", tm))) {
241 return NULL;
242 }
243 break;
244 case 'R': /* equivalent of %H:%M */
245 if (!(s = unbound_strptime(s, "%H:%M", tm))) {
246 return NULL;
247 }
248 break;
249 case 'S': /* seconds */
250 ret = str2int(&s, 2);
251 /* 60 may occur for leap seconds */
252 /* earlier 61 was also allowed */
253 if (ret < 0 || ret > 60) { /* must be in [00,60] */
254 return NULL;
255 }
256 tm->tm_sec = ret;
257 break;
258 case 'T': /* equivalent of %H:%M:%S */
259 if (!(s = unbound_strptime(s, "%H:%M:%S", tm))) {
260 return NULL;
261 }
262 break;
263 case 'U': /* week number, with the first Sun of Jan being w1 */
264 ret = str2int(&s, 2);
265 if (ret < 0 || ret > 53) { /* must be in [00,53] */
266 return NULL;
267 }
268 /** it is hard (and not necessary for nsd) to determine time
269 * data from week number.
270 **/
271 break;
272 case 'w': /* day of week */
273 ret = str2int(&s, 1);
274 if (ret < 0 || ret > 6) { /* must be in [0,6] */
275 return NULL;
276 }
277 tm->tm_wday = ret;
278 break;
279 case 'W': /* week number, with the first Mon of Jan being w1 */
280 ret = str2int(&s, 2);
281 if (ret < 0 || ret > 53) { /* must be in [00,53] */
282 return NULL;
283 }
284 /** it is hard (and not necessary for nsd) to determine time
285 * data from week number.
286 **/
287 break;
288 case 'x': /* date format */
289 if (!(s = unbound_strptime(s, "%m/%d/%y", tm))) {
290 return NULL;
291 }
292 break;
293 case 'X': /* time format */
294 if (!(s = unbound_strptime(s, "%H:%M:%S", tm))) {
295 return NULL;
296 }
297 break;
298 case 'y': /* last two digits of a year */
299 ret = str2int(&s, 2);
300 if (ret < 0 || ret > 99) { /* must be in [00,99] */
301 return NULL;
302 }
303 if (split_year) {
304 tm->tm_year = ((tm->tm_year/100) * 100) + ret;
305 }
306 else {
307 split_year = 1;
308
309 /** currently:
310 * if in [0,68] we are in 21th century,
311 * if in [69,99] we are in 20th century.
312 **/
313 if (ret < 69) /* 2000 */
314 ret += 100;
315 tm->tm_year = ret;
316 }
317 break;
318 case 'Y': /* year */
319 ret = str2int(&s, 4);
320 if (ret < 0 || ret > 9999) {
321 return NULL;
322 }
323 tm->tm_year = ret - TM_YEAR_BASE;
324 break;
325 case '\0':
326 default: /* unsupported, cannot match format */
327 return NULL;
328 break;
329 }
330 }
331 else { /* literal */
332 /* if input cannot match format, return NULL */
333 if (*s != c)
334 return NULL;
335 s++;
336 }
337
338 format++;
339 }
340
341 /* return pointer to remainder of s */
342 return (char*) s;
343}
344
345#endif /* STRPTIME_WORKS */