strptime.c revision 1.12
1 /* $NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code was contributed to The NetBSD Foundation by Klaus Klein. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 #if defined(LIBC_SCCS) && !defined(lint) 40 __RCSID("$NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 mycroft Exp $"); 41 #endif 42 43 #include "namespace.h" 44 #include <sys/localedef.h> 45 #include <ctype.h> 46 #include <locale.h> 47 #include <string.h> 48 #include <time.h> 49 #include <tzfile.h> 50 51 #ifdef __weak_alias 52 __weak_alias(strptime,_strptime); 53 #endif 54 55 #define _ctloc(x) __CONCAT(_CurrentTimeLocale->,x) 56 57 /* 58 * We do not implement alternate representations. However, we always 59 * check whether a given modifier is allowed for a certain conversion. 60 */ 61 #define _ALT_E 0x01 62 #define _ALT_O 0x02 63 #define _LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } 64 65 66 static int _conv_num __P((const char **, int *, int, int)); 67 68 69 char * 70 strptime(buf, fmt, tm) 71 const char *buf, *fmt; 72 struct tm *tm; 73 { 74 char c; 75 const char *bp; 76 int alt_format, i, len; 77 78 bp = buf; 79 80 while ((c = *fmt) != '\0') { 81 /* Clear `alternate' modifier prior to new conversion. */ 82 alt_format = 0; 83 84 /* Eat up white-space. */ 85 if (isspace(c)) { 86 while (isspace(*bp)) 87 bp++; 88 89 fmt++; 90 continue; 91 } 92 93 if ((c = *fmt++) != '%') 94 goto literal; 95 96 97 again: switch (c = *fmt++) { 98 case '%': /* "%%" is converted to "%". */ 99 literal: 100 if (c != *bp++) 101 return (0); 102 103 break; 104 105 /* 106 * "Alternative" modifiers. Just set the appropriate flag 107 * and start over again. 108 */ 109 case 'E': /* "%E?" alternative conversion modifier. */ 110 _LEGAL_ALT(0); 111 alt_format |= _ALT_E; 112 goto again; 113 114 case 'O': /* "%O?" alternative conversion modifier. */ 115 _LEGAL_ALT(0); 116 alt_format |= _ALT_O; 117 goto again; 118 119 /* 120 * "Complex" conversion rules, implemented through recursion. 121 */ 122 case 'c': /* Date and time, using the locale's format. */ 123 _LEGAL_ALT(_ALT_E); 124 if (!(bp = strptime(bp, _ctloc(d_t_fmt), tm))) 125 return (0); 126 break; 127 128 case 'D': /* The date as "%m/%d/%y". */ 129 _LEGAL_ALT(0); 130 if (!(bp = strptime(bp, "%m/%d/%y", tm))) 131 return (0); 132 break; 133 134 case 'R': /* The time as "%H:%M". */ 135 _LEGAL_ALT(0); 136 if (!(bp = strptime(bp, "%H:%M", tm))) 137 return (0); 138 break; 139 140 case 'r': /* The time in 12-hour clock representation. */ 141 _LEGAL_ALT(0); 142 if (!(bp = strptime(bp, _ctloc(t_fmt_ampm), tm))) 143 return (0); 144 break; 145 146 case 'T': /* The time as "%H:%M:%S". */ 147 _LEGAL_ALT(0); 148 if (!(bp = strptime(bp, "%H:%M:%S", tm))) 149 return (0); 150 break; 151 152 case 'X': /* The time, using the locale's format. */ 153 _LEGAL_ALT(_ALT_E); 154 if (!(bp = strptime(bp, _ctloc(t_fmt), tm))) 155 return (0); 156 break; 157 158 case 'x': /* The date, using the locale's format. */ 159 _LEGAL_ALT(_ALT_E); 160 if (!(bp = strptime(bp, _ctloc(d_fmt), tm))) 161 return (0); 162 break; 163 164 /* 165 * "Elementary" conversion rules. 166 */ 167 case 'A': /* The day of week, using the locale's form. */ 168 case 'a': 169 _LEGAL_ALT(0); 170 for (i = 0; i < 7; i++) { 171 /* Full name. */ 172 len = strlen(_ctloc(day[i])); 173 if (strncmp(_ctloc(day[i]), bp, len) == 0) 174 break; 175 176 /* Abbreviated name. */ 177 len = strlen(_ctloc(abday[i])); 178 if (strncmp(_ctloc(abday[i]), bp, len) == 0) 179 break; 180 } 181 182 /* Nothing matched. */ 183 if (i == 7) 184 return (0); 185 186 tm->tm_wday = i; 187 bp += len; 188 break; 189 190 case 'B': /* The month, using the locale's form. */ 191 case 'b': 192 case 'h': 193 _LEGAL_ALT(0); 194 for (i = 0; i < 12; i++) { 195 /* Full name. */ 196 len = strlen(_ctloc(mon[i])); 197 if (strncmp(_ctloc(mon[i]), bp, len) == 0) 198 break; 199 200 /* Abbreviated name. */ 201 len = strlen(_ctloc(abmon[i])); 202 if (strncmp(_ctloc(abmon[i]), bp, len) == 0) 203 break; 204 } 205 206 /* Nothing matched. */ 207 if (i == 12) 208 return (0); 209 210 tm->tm_mon = i; 211 bp += len; 212 break; 213 214 case 'C': /* The century number. */ 215 _LEGAL_ALT(_ALT_E); 216 if (!(_conv_num(&bp, &i, 0, 99))) 217 return (0); 218 219 tm->tm_year = i * 100; 220 break; 221 222 case 'd': /* The day of month. */ 223 case 'e': 224 _LEGAL_ALT(_ALT_O); 225 if (!(_conv_num(&bp, &tm->tm_mday, 1, 31))) 226 return (0); 227 break; 228 229 case 'k': /* The hour (24-hour clock representation). */ 230 _LEGAL_ALT(0); 231 /* FALLTHROUGH */ 232 case 'H': 233 _LEGAL_ALT(_ALT_O); 234 if (!(_conv_num(&bp, &tm->tm_hour, 0, 23))) 235 return (0); 236 break; 237 238 case 'l': /* The hour (12-hour clock representation). */ 239 _LEGAL_ALT(0); 240 /* FALLTHROUGH */ 241 case 'I': 242 _LEGAL_ALT(_ALT_O); 243 if (!(_conv_num(&bp, &tm->tm_hour, 0, 11))) 244 return (0); 245 break; 246 247 case 'j': /* The day of year. */ 248 _LEGAL_ALT(0); 249 if (!(_conv_num(&bp, &tm->tm_yday, 1, 366))) 250 return (0); 251 break; 252 253 case 'M': /* The minute. */ 254 _LEGAL_ALT(_ALT_O); 255 if (!(_conv_num(&bp, &tm->tm_min, 0, 59))) 256 return (0); 257 break; 258 259 case 'm': /* The month. */ 260 _LEGAL_ALT(_ALT_O); 261 if (!(_conv_num(&bp, &tm->tm_mon, 1, 12))) 262 return (0); 263 break; 264 265 case 'p': /* The locale's equivalent of AM/PM. */ 266 _LEGAL_ALT(0); 267 /* AM? */ 268 if (strcmp(_ctloc(am_pm[0]), bp) == 0) { 269 if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */ 270 return (0); 271 else if (tm->tm_hour == 12) 272 tm->tm_hour = 0; 273 274 bp += strlen(_ctloc(am_pm[0])); 275 break; 276 } 277 /* PM? */ 278 else if (strcmp(_ctloc(am_pm[1]), bp) == 0) { 279 if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */ 280 return (0); 281 else if (tm->tm_hour < 12) 282 tm->tm_hour += 12; 283 284 bp += strlen(_ctloc(am_pm[1])); 285 break; 286 } 287 288 /* Nothing matched. */ 289 return (0); 290 291 case 'S': /* The seconds. */ 292 _LEGAL_ALT(_ALT_O); 293 if (!(_conv_num(&bp, &tm->tm_sec, 1, 61))) 294 return (0); 295 break; 296 297 case 'U': /* The week of year, beginning on sunday. */ 298 case 'W': /* The week of year, beginning on monday. */ 299 _LEGAL_ALT(_ALT_O); 300 /* 301 * XXX This is bogus, as we can not assume any valid 302 * information present in the tm structure at this 303 * point to calculate a real value, so just check the 304 * range for now. 305 */ 306 if (!(_conv_num(&bp, &i, 0, 53))) 307 return (0); 308 break; 309 310 case 'w': /* The day of week, beginning on sunday. */ 311 _LEGAL_ALT(_ALT_O); 312 if (!(_conv_num(&bp, &tm->tm_wday, 0, 6))) 313 return (0); 314 break; 315 316 case 'Y': /* The year. */ 317 _LEGAL_ALT(_ALT_E); 318 if (!(_conv_num(&bp, &i, 0, INT_MAX))) 319 return (0); 320 321 tm->tm_year = i - TM_YEAR_BASE; 322 break; 323 324 case 'y': /* The year within 100 years of the epoch. */ 325 _LEGAL_ALT(_ALT_E | _ALT_O); 326 if (!(_conv_num(&bp, &i, 0, 99))) 327 return (0); 328 329 if (i <= 68) 330 tm->tm_year = i + 2000 - TM_YEAR_BASE; 331 else 332 tm->tm_year = i + 1900 - TM_YEAR_BASE; 333 break; 334 335 /* 336 * Miscellaneous conversions. 337 */ 338 case 'n': /* Any kind of white-space. */ 339 case 't': 340 _LEGAL_ALT(0); 341 while (isspace(*bp)) 342 bp++; 343 break; 344 345 346 default: /* Unknown/unsupported conversion. */ 347 return (0); 348 } 349 350 351 } 352 353 return ((char *)bp); 354 } 355 356 357 static int 358 _conv_num(buf, dest, llim, ulim) 359 const char **buf; 360 int *dest; 361 int llim, ulim; 362 { 363 *dest = 0; 364 365 if (**buf < '0' || **buf > '9') 366 return (0); 367 368 do { 369 *dest *= 10; 370 *dest += *(*buf)++ - '0'; 371 } while ((*dest * 10 <= ulim) && **buf >= '0' && **buf <= '9'); 372 373 if (*dest < llim || *dest > ulim) 374 return (0); 375 376 return (1); 377 } 378
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