strptime.c revision 1.6
1 /* $NetBSD: strptime.c,v 1.6 1997/07/13 20:26:53 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 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 1.6 1997/07/13 20:26:53 christos Exp $"); 41 #endif 42 43 #include <sys/localedef.h> 44 #include <ctype.h> 45 #include <locale.h> 46 #include <string.h> 47 #include <time.h> 48 49 #define _ctloc(x) __CONCAT(_CurrentTimeLocale->,x) 50 51 /* 52 * We do not implement alternate representations. However, we always 53 * check whether a given modifier is allowed for a certain conversion. 54 */ 55 #define _ALT_E 0x01 56 #define _ALT_O 0x02 57 #define _LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } 58 59 60 static int _conv_num __P((const char **, int *, int, int)); 61 62 63 char * 64 strptime(buf, fmt, tm) 65 const char *buf, *fmt; 66 struct tm *tm; 67 { 68 char c; 69 const char *bp; 70 int alt_format, i, len; 71 72 bp = buf; 73 74 while ((c = *fmt) != '\0') { 75 /* Clear `alternate' modifier prior to new conversion. */ 76 alt_format = 0; 77 78 /* Eat up white-space. */ 79 if (isspace(c)) { 80 while (isspace(*bp)) 81 bp++; 82 83 fmt++; 84 continue; 85 } 86 87 if ((c = *fmt++) != '%') 88 goto literal; 89 90 91 again: switch (c = *fmt++) { 92 case '%': /* "%%" is converted to "%". */ 93 literal: 94 if (c != *bp++) 95 return (0); 96 97 break; 98 99 /* 100 * "Alternative" modifiers. Just set the appropriate flag 101 * and start over again. 102 */ 103 case 'E': /* "%E?" alternative conversion modifier. */ 104 _LEGAL_ALT(0); 105 alt_format |= _ALT_E; 106 goto again; 107 108 case 'O': /* "%O?" alternative conversion modifier. */ 109 _LEGAL_ALT(0); 110 alt_format |= _ALT_O; 111 goto again; 112 113 /* 114 * "Complex" conversion rules, implemented through recursion. 115 */ 116 case 'c': /* Date and time, using the locale's format. */ 117 _LEGAL_ALT(_ALT_E); 118 if (!(bp = strptime(bp, _ctloc(d_t_fmt), tm))) 119 return (0); 120 break; 121 122 case 'D': /* The date as "%m/%d/%y". */ 123 _LEGAL_ALT(0); 124 if (!(bp = strptime(bp, "%m/%d/%y", tm))) 125 return (0); 126 break; 127 128 case 'R': /* The time as "%H:%M". */ 129 _LEGAL_ALT(0); 130 if (!(bp = strptime(bp, "%H:%M", tm))) 131 return (0); 132 break; 133 134 case 'r': /* The time in 12-hour clock representation. */ 135 _LEGAL_ALT(0); 136 if (!(bp = strptime(bp, _ctloc(t_fmt_ampm), tm))) 137 return (0); 138 break; 139 140 case 'T': /* The time as "%H:%M:%S". */ 141 _LEGAL_ALT(0); 142 if (!(bp = strptime(bp, "%H:%M:%S", tm))) 143 return (0); 144 break; 145 146 case 'X': /* The time, using the locale's format. */ 147 _LEGAL_ALT(_ALT_E); 148 if (!(bp = strptime(bp, _ctloc(t_fmt), tm))) 149 return (0); 150 break; 151 152 case 'x': /* The date, using the locale's format. */ 153 _LEGAL_ALT(_ALT_E); 154 if (!(bp = strptime(bp, _ctloc(d_fmt), tm))) 155 return (0); 156 break; 157 158 /* 159 * "Elementary" conversion rules. 160 */ 161 case 'A': /* The day of week, using the locale's form. */ 162 case 'a': 163 _LEGAL_ALT(0); 164 for (i = 0; i < 7; i++) { 165 /* Full name. */ 166 len = strlen(_ctloc(day[i])); 167 if (strncmp(_ctloc(day[i]), bp, len) == 0) 168 break; 169 170 /* Abbreviated name. */ 171 len = strlen(_ctloc(abday[i])); 172 if (strncmp(_ctloc(abday[i]), bp, len) == 0) 173 break; 174 } 175 176 /* Nothing matched. */ 177 if (i == 7) 178 return (0); 179 180 tm->tm_wday = i; 181 bp += len; 182 break; 183 184 case 'B': /* The month, using the locale's form. */ 185 case 'b': 186 case 'h': 187 _LEGAL_ALT(0); 188 for (i = 0; i < 12; i++) { 189 /* Full name. */ 190 len = strlen(_ctloc(mon[i])); 191 if (strncmp(_ctloc(mon[i]), bp, len) == 0) 192 break; 193 194 /* Abbreviated name. */ 195 len = strlen(_ctloc(abmon[i])); 196 if (strncmp(_ctloc(abmon[i]), bp, len) == 0) 197 break; 198 } 199 200 /* Nothing matched. */ 201 if (i == 12) 202 return (0); 203 204 tm->tm_mon = i; 205 bp += len; 206 break; 207 208 case 'C': /* The century number. */ 209 _LEGAL_ALT(_ALT_E); 210 if (!(_conv_num(&bp, &i, 0, 99))) 211 return (0); 212 213 tm->tm_year = i * 100; 214 break; 215 216 case 'd': /* The day of month. */ 217 case 'e': 218 _LEGAL_ALT(_ALT_O); 219 if (!(_conv_num(&bp, &tm->tm_mday, 1, 31))) 220 return (0); 221 break; 222 223 case 'k': /* The hour (24-hour clock representation). */ 224 _LEGAL_ALT(0); 225 /* FALLTHROUGH */ 226 case 'H': 227 _LEGAL_ALT(_ALT_O); 228 if (!(_conv_num(&bp, &tm->tm_hour, 0, 23))) 229 return (0); 230 break; 231 232 case 'l': /* The hour (12-hour clock representation). */ 233 _LEGAL_ALT(0); 234 /* FALLTHROUGH */ 235 case 'I': 236 _LEGAL_ALT(_ALT_O); 237 if (!(_conv_num(&bp, &tm->tm_hour, 0, 11))) 238 return (0); 239 break; 240 241 case 'j': /* The day of year. */ 242 _LEGAL_ALT(0); 243 if (!(_conv_num(&bp, &tm->tm_yday, 1, 366))) 244 return (0); 245 break; 246 247 case 'M': /* The minute. */ 248 _LEGAL_ALT(_ALT_O); 249 if (!(_conv_num(&bp, &tm->tm_min, 0, 59))) 250 return (0); 251 break; 252 253 case 'm': /* The month. */ 254 _LEGAL_ALT(_ALT_O); 255 if (!(_conv_num(&bp, &tm->tm_mon, 1, 12))) 256 return (0); 257 break; 258 259 case 'p': /* The locale's equivalent of AM/PM. */ 260 _LEGAL_ALT(0); 261 /* AM? */ 262 if (strcmp(_ctloc(am_pm[0]), bp) == 0) { 263 if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */ 264 return (0); 265 else if (tm->tm_hour == 12) 266 tm->tm_hour = 0; 267 268 bp += strlen(_ctloc(am_pm[0])); 269 break; 270 } 271 /* PM? */ 272 else if (strcmp(_ctloc(am_pm[1]), bp) == 0) { 273 if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */ 274 return (0); 275 else if (tm->tm_hour < 12) 276 tm->tm_hour += 12; 277 278 bp += strlen(_ctloc(am_pm[1])); 279 break; 280 } 281 282 /* Nothing matched. */ 283 return (0); 284 285 case 'S': /* The seconds. */ 286 _LEGAL_ALT(_ALT_O); 287 if (!(_conv_num(&bp, &tm->tm_sec, 1, 61))) 288 return (0); 289 break; 290 291 case 'U': /* The week of year, beginning on sunday. */ 292 case 'W': /* The week of year, beginning on monday. */ 293 _LEGAL_ALT(_ALT_O); 294 /* 295 * XXX This is bogus, as we can not assume any valid 296 * information present in the tm structure at this 297 * point to calculate a real value, so just check the 298 * range for now. 299 */ 300 if (!(_conv_num(&bp, &i, 0, 53))) 301 return (0); 302 break; 303 304 case 'w': /* The day of week, beginning on sunday. */ 305 _LEGAL_ALT(_ALT_O); 306 if (!(_conv_num(&bp, &tm->tm_wday, 0, 6))) 307 return (0); 308 break; 309 310 case 'Y': /* The year. */ 311 _LEGAL_ALT(_ALT_E); 312 if (!(_conv_num(&bp, &i, 0, INT_MAX))) 313 return (0); 314 315 tm->tm_year = i - 1900; 316 break; 317 318 case 'y': /* The year within the 20th century. */ 319 _LEGAL_ALT(_ALT_E | _ALT_O); 320 if (!(_conv_num(&bp, &tm->tm_year, 0, 99))) 321 return (0); 322 break; 323 324 /* 325 * Miscellaneous conversions. 326 */ 327 case 'n': /* Any kind of white-space. */ 328 case 't': 329 _LEGAL_ALT(0); 330 while (isspace(*bp)) 331 bp++; 332 break; 333 334 335 default: /* Unknown/unsupported conversion. */ 336 return (0); 337 } 338 339 340 } 341 342 return ((char *)bp); 343 } 344 345 346 static int 347 _conv_num(buf, dest, llim, ulim) 348 const char **buf; 349 int *dest; 350 int llim, ulim; 351 { 352 *dest = 0; 353 354 if (**buf < '0' || **buf > '9') 355 return (0); 356 357 do { 358 *dest *= 10; 359 *dest += *(*buf)++ - '0'; 360 } while ((*dest * 10 <= ulim) && **buf >= '0' && **buf <= '9'); 361 362 if (*dest < llim || *dest > ulim) 363 return (0); 364 365 return (1); 366 } 367
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