Darren Tucker | aa74f67 | 2010-08-16 13:15:23 +1000 | [diff] [blame] | 1 | /* $OpenBSD: strptime.c,v 1.12 2008/06/26 05:42:05 ray Exp $ */ |
| 2 | /* $NetBSD: strptime.c,v 1.12 1998/01/20 21:39:40 mycroft Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * This code was contributed to The NetBSD Foundation by Klaus Klein. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* OPENBSD ORIGINAL: lib/libc/time/strptime.c */ |
| 33 | |
| 34 | #include "includes.h" |
| 35 | |
| 36 | #ifndef HAVE_STRPTIME |
| 37 | |
| 38 | #define TM_YEAR_BASE 1900 /* from tzfile.h */ |
| 39 | |
| 40 | #include <ctype.h> |
| 41 | #include <locale.h> |
| 42 | #include <string.h> |
| 43 | #include <time.h> |
| 44 | |
| 45 | /* #define _ctloc(x) (_CurrentTimeLocale->x) */ |
| 46 | |
| 47 | /* |
| 48 | * We do not implement alternate representations. However, we always |
| 49 | * check whether a given modifier is allowed for a certain conversion. |
| 50 | */ |
| 51 | #define _ALT_E 0x01 |
| 52 | #define _ALT_O 0x02 |
| 53 | #define _LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } |
| 54 | |
| 55 | |
| 56 | static int _conv_num(const unsigned char **, int *, int, int); |
| 57 | static char *_strptime(const char *, const char *, struct tm *, int); |
| 58 | |
| 59 | |
| 60 | char * |
| 61 | strptime(const char *buf, const char *fmt, struct tm *tm) |
| 62 | { |
| 63 | return(_strptime(buf, fmt, tm, 1)); |
| 64 | } |
| 65 | |
| 66 | static char * |
| 67 | _strptime(const char *buf, const char *fmt, struct tm *tm, int initialize) |
| 68 | { |
| 69 | unsigned char c; |
| 70 | const unsigned char *bp; |
| 71 | size_t len; |
| 72 | int alt_format, i; |
| 73 | static int century, relyear; |
| 74 | |
| 75 | if (initialize) { |
| 76 | century = TM_YEAR_BASE; |
| 77 | relyear = -1; |
| 78 | } |
| 79 | |
| 80 | bp = (unsigned char *)buf; |
| 81 | while ((c = *fmt) != '\0') { |
| 82 | /* Clear `alternate' modifier prior to new conversion. */ |
| 83 | alt_format = 0; |
| 84 | |
| 85 | /* Eat up white-space. */ |
| 86 | if (isspace(c)) { |
| 87 | while (isspace(*bp)) |
| 88 | bp++; |
| 89 | |
| 90 | fmt++; |
| 91 | continue; |
| 92 | } |
| 93 | |
| 94 | if ((c = *fmt++) != '%') |
| 95 | goto literal; |
| 96 | |
| 97 | |
| 98 | again: switch (c = *fmt++) { |
| 99 | case '%': /* "%%" is converted to "%". */ |
| 100 | literal: |
| 101 | if (c != *bp++) |
| 102 | return (NULL); |
| 103 | |
| 104 | break; |
| 105 | |
| 106 | /* |
| 107 | * "Alternative" modifiers. Just set the appropriate flag |
| 108 | * and start over again. |
| 109 | */ |
| 110 | case 'E': /* "%E?" alternative conversion modifier. */ |
| 111 | _LEGAL_ALT(0); |
| 112 | alt_format |= _ALT_E; |
| 113 | goto again; |
| 114 | |
| 115 | case 'O': /* "%O?" alternative conversion modifier. */ |
| 116 | _LEGAL_ALT(0); |
| 117 | alt_format |= _ALT_O; |
| 118 | goto again; |
| 119 | |
| 120 | /* |
| 121 | * "Complex" conversion rules, implemented through recursion. |
| 122 | */ |
| 123 | #if 0 |
| 124 | case 'c': /* Date and time, using the locale's format. */ |
| 125 | _LEGAL_ALT(_ALT_E); |
| 126 | if (!(bp = _strptime(bp, _ctloc(d_t_fmt), tm, 0))) |
| 127 | return (NULL); |
| 128 | break; |
| 129 | #endif |
| 130 | case 'D': /* The date as "%m/%d/%y". */ |
| 131 | _LEGAL_ALT(0); |
| 132 | if (!(bp = _strptime(bp, "%m/%d/%y", tm, 0))) |
| 133 | return (NULL); |
| 134 | break; |
| 135 | |
| 136 | case 'R': /* The time as "%H:%M". */ |
| 137 | _LEGAL_ALT(0); |
| 138 | if (!(bp = _strptime(bp, "%H:%M", tm, 0))) |
| 139 | return (NULL); |
| 140 | break; |
| 141 | |
| 142 | case 'r': /* The time as "%I:%M:%S %p". */ |
| 143 | _LEGAL_ALT(0); |
| 144 | if (!(bp = _strptime(bp, "%I:%M:%S %p", tm, 0))) |
| 145 | return (NULL); |
| 146 | break; |
| 147 | |
| 148 | case 'T': /* The time as "%H:%M:%S". */ |
| 149 | _LEGAL_ALT(0); |
| 150 | if (!(bp = _strptime(bp, "%H:%M:%S", tm, 0))) |
| 151 | return (NULL); |
| 152 | break; |
| 153 | #if 0 |
| 154 | case 'X': /* The time, using the locale's format. */ |
| 155 | _LEGAL_ALT(_ALT_E); |
| 156 | if (!(bp = _strptime(bp, _ctloc(t_fmt), tm, 0))) |
| 157 | return (NULL); |
| 158 | break; |
| 159 | |
| 160 | case 'x': /* The date, using the locale's format. */ |
| 161 | _LEGAL_ALT(_ALT_E); |
| 162 | if (!(bp = _strptime(bp, _ctloc(d_fmt), tm, 0))) |
| 163 | return (NULL); |
| 164 | break; |
| 165 | #endif |
| 166 | /* |
| 167 | * "Elementary" conversion rules. |
| 168 | */ |
| 169 | #if 0 |
| 170 | case 'A': /* The day of week, using the locale's form. */ |
| 171 | case 'a': |
| 172 | _LEGAL_ALT(0); |
| 173 | for (i = 0; i < 7; i++) { |
| 174 | /* Full name. */ |
| 175 | len = strlen(_ctloc(day[i])); |
| 176 | if (strncasecmp(_ctloc(day[i]), bp, len) == 0) |
| 177 | break; |
| 178 | |
| 179 | /* Abbreviated name. */ |
| 180 | len = strlen(_ctloc(abday[i])); |
| 181 | if (strncasecmp(_ctloc(abday[i]), bp, len) == 0) |
| 182 | break; |
| 183 | } |
| 184 | |
| 185 | /* Nothing matched. */ |
| 186 | if (i == 7) |
| 187 | return (NULL); |
| 188 | |
| 189 | tm->tm_wday = i; |
| 190 | bp += len; |
| 191 | break; |
| 192 | |
| 193 | case 'B': /* The month, using the locale's form. */ |
| 194 | case 'b': |
| 195 | case 'h': |
| 196 | _LEGAL_ALT(0); |
| 197 | for (i = 0; i < 12; i++) { |
| 198 | /* Full name. */ |
| 199 | len = strlen(_ctloc(mon[i])); |
| 200 | if (strncasecmp(_ctloc(mon[i]), bp, len) == 0) |
| 201 | break; |
| 202 | |
| 203 | /* Abbreviated name. */ |
| 204 | len = strlen(_ctloc(abmon[i])); |
| 205 | if (strncasecmp(_ctloc(abmon[i]), bp, len) == 0) |
| 206 | break; |
| 207 | } |
| 208 | |
| 209 | /* Nothing matched. */ |
| 210 | if (i == 12) |
| 211 | return (NULL); |
| 212 | |
| 213 | tm->tm_mon = i; |
| 214 | bp += len; |
| 215 | break; |
| 216 | #endif |
| 217 | |
| 218 | case 'C': /* The century number. */ |
| 219 | _LEGAL_ALT(_ALT_E); |
| 220 | if (!(_conv_num(&bp, &i, 0, 99))) |
| 221 | return (NULL); |
| 222 | |
| 223 | century = i * 100; |
| 224 | break; |
| 225 | |
| 226 | case 'd': /* The day of month. */ |
| 227 | case 'e': |
| 228 | _LEGAL_ALT(_ALT_O); |
| 229 | if (!(_conv_num(&bp, &tm->tm_mday, 1, 31))) |
| 230 | return (NULL); |
| 231 | break; |
| 232 | |
| 233 | case 'k': /* The hour (24-hour clock representation). */ |
| 234 | _LEGAL_ALT(0); |
| 235 | /* FALLTHROUGH */ |
| 236 | case 'H': |
| 237 | _LEGAL_ALT(_ALT_O); |
| 238 | if (!(_conv_num(&bp, &tm->tm_hour, 0, 23))) |
| 239 | return (NULL); |
| 240 | break; |
| 241 | |
| 242 | case 'l': /* The hour (12-hour clock representation). */ |
| 243 | _LEGAL_ALT(0); |
| 244 | /* FALLTHROUGH */ |
| 245 | case 'I': |
| 246 | _LEGAL_ALT(_ALT_O); |
| 247 | if (!(_conv_num(&bp, &tm->tm_hour, 1, 12))) |
| 248 | return (NULL); |
| 249 | break; |
| 250 | |
| 251 | case 'j': /* The day of year. */ |
| 252 | _LEGAL_ALT(0); |
| 253 | if (!(_conv_num(&bp, &tm->tm_yday, 1, 366))) |
| 254 | return (NULL); |
| 255 | tm->tm_yday--; |
| 256 | break; |
| 257 | |
| 258 | case 'M': /* The minute. */ |
| 259 | _LEGAL_ALT(_ALT_O); |
| 260 | if (!(_conv_num(&bp, &tm->tm_min, 0, 59))) |
| 261 | return (NULL); |
| 262 | break; |
| 263 | |
| 264 | case 'm': /* The month. */ |
| 265 | _LEGAL_ALT(_ALT_O); |
| 266 | if (!(_conv_num(&bp, &tm->tm_mon, 1, 12))) |
| 267 | return (NULL); |
| 268 | tm->tm_mon--; |
| 269 | break; |
| 270 | |
| 271 | #if 0 |
| 272 | case 'p': /* The locale's equivalent of AM/PM. */ |
| 273 | _LEGAL_ALT(0); |
| 274 | /* AM? */ |
| 275 | len = strlen(_ctloc(am_pm[0])); |
| 276 | if (strncasecmp(_ctloc(am_pm[0]), bp, len) == 0) { |
| 277 | if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */ |
| 278 | return (NULL); |
| 279 | else if (tm->tm_hour == 12) |
| 280 | tm->tm_hour = 0; |
| 281 | |
| 282 | bp += len; |
| 283 | break; |
| 284 | } |
| 285 | /* PM? */ |
| 286 | len = strlen(_ctloc(am_pm[1])); |
| 287 | if (strncasecmp(_ctloc(am_pm[1]), bp, len) == 0) { |
| 288 | if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */ |
| 289 | return (NULL); |
| 290 | else if (tm->tm_hour < 12) |
| 291 | tm->tm_hour += 12; |
| 292 | |
| 293 | bp += len; |
| 294 | break; |
| 295 | } |
| 296 | |
| 297 | /* Nothing matched. */ |
| 298 | return (NULL); |
| 299 | #endif |
| 300 | case 'S': /* The seconds. */ |
| 301 | _LEGAL_ALT(_ALT_O); |
| 302 | if (!(_conv_num(&bp, &tm->tm_sec, 0, 61))) |
| 303 | return (NULL); |
| 304 | break; |
| 305 | |
| 306 | case 'U': /* The week of year, beginning on sunday. */ |
| 307 | case 'W': /* The week of year, beginning on monday. */ |
| 308 | _LEGAL_ALT(_ALT_O); |
| 309 | /* |
| 310 | * XXX This is bogus, as we can not assume any valid |
| 311 | * information present in the tm structure at this |
| 312 | * point to calculate a real value, so just check the |
| 313 | * range for now. |
| 314 | */ |
| 315 | if (!(_conv_num(&bp, &i, 0, 53))) |
| 316 | return (NULL); |
| 317 | break; |
| 318 | |
| 319 | case 'w': /* The day of week, beginning on sunday. */ |
| 320 | _LEGAL_ALT(_ALT_O); |
| 321 | if (!(_conv_num(&bp, &tm->tm_wday, 0, 6))) |
| 322 | return (NULL); |
| 323 | break; |
| 324 | |
| 325 | case 'Y': /* The year. */ |
| 326 | _LEGAL_ALT(_ALT_E); |
| 327 | if (!(_conv_num(&bp, &i, 0, 9999))) |
| 328 | return (NULL); |
| 329 | |
| 330 | relyear = -1; |
| 331 | tm->tm_year = i - TM_YEAR_BASE; |
| 332 | break; |
| 333 | |
| 334 | case 'y': /* The year within the century (2 digits). */ |
| 335 | _LEGAL_ALT(_ALT_E | _ALT_O); |
| 336 | if (!(_conv_num(&bp, &relyear, 0, 99))) |
| 337 | return (NULL); |
| 338 | break; |
| 339 | |
| 340 | /* |
| 341 | * Miscellaneous conversions. |
| 342 | */ |
| 343 | case 'n': /* Any kind of white-space. */ |
| 344 | case 't': |
| 345 | _LEGAL_ALT(0); |
| 346 | while (isspace(*bp)) |
| 347 | bp++; |
| 348 | break; |
| 349 | |
| 350 | |
| 351 | default: /* Unknown/unsupported conversion. */ |
| 352 | return (NULL); |
| 353 | } |
| 354 | |
| 355 | |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * We need to evaluate the two digit year spec (%y) |
| 360 | * last as we can get a century spec (%C) at any time. |
| 361 | */ |
| 362 | if (relyear != -1) { |
| 363 | if (century == TM_YEAR_BASE) { |
| 364 | if (relyear <= 68) |
| 365 | tm->tm_year = relyear + 2000 - TM_YEAR_BASE; |
| 366 | else |
| 367 | tm->tm_year = relyear + 1900 - TM_YEAR_BASE; |
| 368 | } else { |
| 369 | tm->tm_year = relyear + century - TM_YEAR_BASE; |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | return ((char *)bp); |
| 374 | } |
| 375 | |
| 376 | |
| 377 | static int |
| 378 | _conv_num(const unsigned char **buf, int *dest, int llim, int ulim) |
| 379 | { |
| 380 | int result = 0; |
| 381 | int rulim = ulim; |
| 382 | |
| 383 | if (**buf < '0' || **buf > '9') |
| 384 | return (0); |
| 385 | |
| 386 | /* we use rulim to break out of the loop when we run out of digits */ |
| 387 | do { |
| 388 | result *= 10; |
| 389 | result += *(*buf)++ - '0'; |
| 390 | rulim /= 10; |
| 391 | } while ((result * 10 <= ulim) && rulim && **buf >= '0' && **buf <= '9'); |
| 392 | |
| 393 | if (result < llim || result > ulim) |
| 394 | return (0); |
| 395 | |
| 396 | *dest = result; |
| 397 | return (1); |
| 398 | } |
| 399 | |
| 400 | #endif /* HAVE_STRPTIME */ |
| 401 | |