Mercurial > hg > octave-jordi > gnulib-hg
annotate lib/getdate.y @ 176:10b9f9091b11
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| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Thu, 23 Dec 1993 00:08:30 +0000 |
| parents | e94323d656bf |
| children | 6d70bc3b54e3 |
| rev | line source |
|---|---|
| 9 | 1 %{ |
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2 /* |
| 9 | 3 ** Originally written by Steven M. Bellovin <smb@research.att.com> while |
| 4 ** at the University of North Carolina at Chapel Hill. Later tweaked by | |
| 5 ** a couple of people on Usenet. Completely overhauled by Rich $alz | |
| 6 ** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990; | |
| 7 ** send any email to Rich. | |
| 8 ** | |
| 48 | 9 ** This grammar has nine shift/reduce conflicts. |
| 9 | 10 ** |
| 11 ** This code is in the public domain and has no copyright. | |
| 12 */ | |
| 13 /* SUPPRESS 287 on yaccpar_sccsid *//* Unusd static variable */ | |
| 14 /* SUPPRESS 288 on yyerrlab *//* Label unused */ | |
| 15 | |
| 48 | 16 #ifdef HAVE_CONFIG_H |
| 101 | 17 #if defined (emacs) || defined (CONFIG_BROKETS) |
| 18 #include <config.h> | |
| 19 #else | |
| 48 | 20 #include "config.h" |
| 21 #endif | |
| 101 | 22 #endif |
| 48 | 23 |
|
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24 /* Since the code of getdate.y is not included in the Emacs executable |
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25 itself, there is no need to #define static in this file. Even if |
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26 the code were included in the Emacs executable, it probably |
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27 wouldn't do any harm to #undef it here; this will only cause |
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28 problems if we try to write to a static variable, which I don't |
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29 think this code needs to do. */ |
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30 #ifdef emacs |
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31 #undef static |
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32 #endif |
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33 |
| 122 | 34 /* The following block of alloca-related preprocessor directives is here |
| 35 solely to allow compilation by non GNU-C compilers of the C parser | |
| 36 produced from this file by old versions of bison. Newer versions of | |
| 37 bison include a block similar to this one in bison.simple. */ | |
| 38 | |
| 39 #ifdef __GNUC__ | |
| 40 #define alloca __builtin_alloca | |
| 41 #else | |
| 42 #ifdef HAVE_ALLOCA_H | |
| 43 #include <alloca.h> | |
| 44 #else | |
| 45 #ifdef _AIX | |
| 46 #pragma alloca | |
| 47 #else | |
| 48 void *alloca (); | |
| 49 #endif | |
| 50 #endif | |
| 51 #endif | |
| 52 | |
| 9 | 53 #ifdef __GNUC__ |
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54 #undef alloca |
| 9 | 55 #define alloca __builtin_alloca |
| 56 #else | |
| 48 | 57 #ifdef HAVE_ALLOCA_H |
| 9 | 58 #include <alloca.h> |
| 59 #else | |
| 60 #ifdef _AIX /* for Bison */ | |
| 61 #pragma alloca | |
| 62 #else | |
| 121 | 63 void *alloca (); |
| 9 | 64 #endif |
| 65 #endif | |
| 66 #endif | |
| 67 | |
| 68 #include <stdio.h> | |
| 69 #include <ctype.h> | |
| 70 | |
| 71 /* The code at the top of get_date which figures out the offset of the | |
| 72 current time zone checks various CPP symbols to see if special | |
| 73 tricks are need, but defaults to using the gettimeofday system call. | |
| 74 Include <sys/time.h> if that will be used. */ | |
| 75 | |
| 76 #if defined(vms) | |
| 77 | |
| 78 #include <types.h> | |
| 79 #include <time.h> | |
| 80 | |
| 81 #else | |
| 82 | |
| 83 #include <sys/types.h> | |
| 84 | |
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85 #ifdef TIME_WITH_SYS_TIME |
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86 #include <sys/time.h> |
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87 #include <time.h> |
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88 #else |
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89 #ifdef HAVE_SYS_TIME_H |
| 48 | 90 #include <sys/time.h> |
| 91 #else | |
| 92 #include <time.h> | |
| 93 #endif | |
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94 #endif |
| 48 | 95 |
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96 #ifdef timezone |
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97 #undef timezone /* needed for sgi */ |
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98 #endif |
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99 |
| 171 | 100 #if defined(HAVE_SYS_TIMEB_H) |
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101 #include <sys/timeb.h> |
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102 #else |
| 9 | 103 /* |
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104 ** We use the obsolete `struct timeb' as part of our interface! |
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105 ** Since the system doesn't have it, we define it here; |
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106 ** our callers must do likewise. |
| 9 | 107 */ |
| 108 struct timeb { | |
| 109 time_t time; /* Seconds since the epoch */ | |
| 110 unsigned short millitm; /* Field not used */ | |
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111 short timezone; /* Minutes west of GMT */ |
| 9 | 112 short dstflag; /* Field not used */ |
| 113 }; | |
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114 #endif /* defined(HAVE_SYS_TIMEB_H) */ |
| 9 | 115 |
| 116 #endif /* defined(vms) */ | |
| 117 | |
| 118 #if defined (STDC_HEADERS) || defined (USG) | |
| 119 #include <string.h> | |
| 120 #endif | |
| 121 | |
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122 /* Some old versions of bison generate parsers that use bcopy. |
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123 That loses on systems that don't provide the function, so we have |
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124 to redefine it here. */ |
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125 #if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy) |
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126 #define bcopy(from, to, len) memcpy ((to), (from), (len)) |
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127 #endif |
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128 |
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129 extern struct tm *gmtime(); |
| 9 | 130 extern struct tm *localtime(); |
| 131 | |
| 132 #define yyparse getdate_yyparse | |
| 133 #define yylex getdate_yylex | |
| 134 #define yyerror getdate_yyerror | |
| 135 | |
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136 static int yylex (); |
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137 static int yyerror (); |
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138 |
| 9 | 139 #if !defined(lint) && !defined(SABER) |
| 140 static char RCS[] = | |
| 102 | 141 "$Header: str2date.y,v 2.1 90/09/06 08:15:06 cronan Exp $"; |
| 9 | 142 #endif /* !defined(lint) && !defined(SABER) */ |
| 143 | |
| 144 | |
| 145 #define EPOCH 1970 | |
| 146 #define HOUR(x) ((time_t)(x) * 60) | |
| 147 #define SECSPERDAY (24L * 60L * 60L) | |
| 148 | |
| 149 | |
| 150 /* | |
| 151 ** An entry in the lexical lookup table. | |
| 152 */ | |
| 153 typedef struct _TABLE { | |
| 154 char *name; | |
| 155 int type; | |
| 156 time_t value; | |
| 157 } TABLE; | |
| 158 | |
| 159 | |
| 160 /* | |
| 161 ** Daylight-savings mode: on, off, or not yet known. | |
| 162 */ | |
| 163 typedef enum _DSTMODE { | |
| 164 DSTon, DSToff, DSTmaybe | |
| 165 } DSTMODE; | |
| 166 | |
| 167 /* | |
| 168 ** Meridian: am, pm, or 24-hour style. | |
| 169 */ | |
| 170 typedef enum _MERIDIAN { | |
| 171 MERam, MERpm, MER24 | |
| 172 } MERIDIAN; | |
| 173 | |
| 174 | |
| 175 /* | |
| 176 ** Global variables. We could get rid of most of these by using a good | |
| 177 ** union as the yacc stack. (This routine was originally written before | |
| 178 ** yacc had the %union construct.) Maybe someday; right now we only use | |
| 179 ** the %union very rarely. | |
| 180 */ | |
| 181 static char *yyInput; | |
| 182 static DSTMODE yyDSTmode; | |
| 183 static time_t yyDayOrdinal; | |
| 184 static time_t yyDayNumber; | |
| 185 static int yyHaveDate; | |
| 186 static int yyHaveDay; | |
| 187 static int yyHaveRel; | |
| 188 static int yyHaveTime; | |
| 189 static int yyHaveZone; | |
| 190 static time_t yyTimezone; | |
| 191 static time_t yyDay; | |
| 192 static time_t yyHour; | |
| 193 static time_t yyMinutes; | |
| 194 static time_t yyMonth; | |
| 195 static time_t yySeconds; | |
| 196 static time_t yyYear; | |
| 197 static MERIDIAN yyMeridian; | |
| 198 static time_t yyRelMonth; | |
| 199 static time_t yyRelSeconds; | |
| 200 | |
| 201 %} | |
| 202 | |
| 203 %union { | |
| 204 time_t Number; | |
| 205 enum _MERIDIAN Meridian; | |
| 206 } | |
| 207 | |
| 208 %token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT | |
| 209 %token tSEC_UNIT tSNUMBER tUNUMBER tZONE tDST | |
| 210 | |
| 211 %type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT | |
| 212 %type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE | |
| 213 %type <Meridian> tMERIDIAN o_merid | |
| 214 | |
| 215 %% | |
| 216 | |
| 217 spec : /* NULL */ | |
| 218 | spec item | |
| 219 ; | |
| 220 | |
| 221 item : time { | |
| 222 yyHaveTime++; | |
| 223 } | |
| 224 | zone { | |
| 225 yyHaveZone++; | |
| 226 } | |
| 227 | date { | |
| 228 yyHaveDate++; | |
| 229 } | |
| 230 | day { | |
| 231 yyHaveDay++; | |
| 232 } | |
| 233 | rel { | |
| 234 yyHaveRel++; | |
| 235 } | |
| 236 | number | |
| 237 ; | |
| 238 | |
| 239 time : tUNUMBER tMERIDIAN { | |
| 240 yyHour = $1; | |
| 241 yyMinutes = 0; | |
| 242 yySeconds = 0; | |
| 243 yyMeridian = $2; | |
| 244 } | |
| 245 | tUNUMBER ':' tUNUMBER o_merid { | |
| 246 yyHour = $1; | |
| 247 yyMinutes = $3; | |
| 248 yySeconds = 0; | |
| 249 yyMeridian = $4; | |
| 250 } | |
| 251 | tUNUMBER ':' tUNUMBER tSNUMBER { | |
| 252 yyHour = $1; | |
| 253 yyMinutes = $3; | |
| 254 yyMeridian = MER24; | |
| 255 yyDSTmode = DSToff; | |
| 256 yyTimezone = - ($4 % 100 + ($4 / 100) * 60); | |
| 257 } | |
| 258 | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { | |
| 259 yyHour = $1; | |
| 260 yyMinutes = $3; | |
| 261 yySeconds = $5; | |
| 262 yyMeridian = $6; | |
| 263 } | |
| 264 | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { | |
| 265 yyHour = $1; | |
| 266 yyMinutes = $3; | |
| 267 yySeconds = $5; | |
| 268 yyMeridian = MER24; | |
| 269 yyDSTmode = DSToff; | |
| 270 yyTimezone = - ($6 % 100 + ($6 / 100) * 60); | |
| 271 } | |
| 272 ; | |
| 273 | |
| 274 zone : tZONE { | |
| 275 yyTimezone = $1; | |
| 276 yyDSTmode = DSToff; | |
| 277 } | |
| 278 | tDAYZONE { | |
| 279 yyTimezone = $1; | |
| 280 yyDSTmode = DSTon; | |
| 281 } | |
| 282 | | |
| 283 tZONE tDST { | |
| 284 yyTimezone = $1; | |
| 285 yyDSTmode = DSTon; | |
| 286 } | |
| 287 ; | |
| 288 | |
| 289 day : tDAY { | |
| 290 yyDayOrdinal = 1; | |
| 291 yyDayNumber = $1; | |
| 292 } | |
| 293 | tDAY ',' { | |
| 294 yyDayOrdinal = 1; | |
| 295 yyDayNumber = $1; | |
| 296 } | |
| 297 | tUNUMBER tDAY { | |
| 298 yyDayOrdinal = $1; | |
| 299 yyDayNumber = $2; | |
| 300 } | |
| 301 ; | |
| 302 | |
| 303 date : tUNUMBER '/' tUNUMBER { | |
| 304 yyMonth = $1; | |
| 305 yyDay = $3; | |
| 306 } | |
| 307 | tUNUMBER '/' tUNUMBER '/' tUNUMBER { | |
| 308 yyMonth = $1; | |
| 309 yyDay = $3; | |
| 310 yyYear = $5; | |
| 311 } | |
| 312 | tUNUMBER tSNUMBER tSNUMBER { | |
| 313 /* ISO 8601 format. yyyy-mm-dd. */ | |
| 314 yyYear = $1; | |
| 315 yyMonth = -$2; | |
| 316 yyDay = -$3; | |
| 317 } | |
| 176 | 318 | tUNUMBER tMONTH tSNUMBER { |
| 319 /* e.g. 17-JUN-1992. */ | |
| 320 yyDay = $1; | |
| 321 yyMonth = $2; | |
| 322 yyYear = -$3; | |
| 323 } | |
| 9 | 324 | tMONTH tUNUMBER { |
| 325 yyMonth = $1; | |
| 326 yyDay = $2; | |
| 327 } | |
| 328 | tMONTH tUNUMBER ',' tUNUMBER { | |
| 329 yyMonth = $1; | |
| 330 yyDay = $2; | |
| 331 yyYear = $4; | |
| 332 } | |
| 333 | tUNUMBER tMONTH { | |
| 334 yyMonth = $2; | |
| 335 yyDay = $1; | |
| 336 } | |
| 337 | tUNUMBER tMONTH tUNUMBER { | |
| 338 yyMonth = $2; | |
| 339 yyDay = $1; | |
| 340 yyYear = $3; | |
| 341 } | |
| 342 ; | |
| 343 | |
| 344 rel : relunit tAGO { | |
| 345 yyRelSeconds = -yyRelSeconds; | |
| 346 yyRelMonth = -yyRelMonth; | |
| 347 } | |
| 348 | relunit | |
| 349 ; | |
| 350 | |
| 351 relunit : tUNUMBER tMINUTE_UNIT { | |
| 352 yyRelSeconds += $1 * $2 * 60L; | |
| 353 } | |
| 354 | tSNUMBER tMINUTE_UNIT { | |
| 355 yyRelSeconds += $1 * $2 * 60L; | |
| 356 } | |
| 357 | tMINUTE_UNIT { | |
| 358 yyRelSeconds += $1 * 60L; | |
| 359 } | |
| 360 | tSNUMBER tSEC_UNIT { | |
| 361 yyRelSeconds += $1; | |
| 362 } | |
| 363 | tUNUMBER tSEC_UNIT { | |
| 364 yyRelSeconds += $1; | |
| 365 } | |
| 366 | tSEC_UNIT { | |
| 367 yyRelSeconds++; | |
| 368 } | |
| 369 | tSNUMBER tMONTH_UNIT { | |
| 370 yyRelMonth += $1 * $2; | |
| 371 } | |
| 372 | tUNUMBER tMONTH_UNIT { | |
| 373 yyRelMonth += $1 * $2; | |
| 374 } | |
| 375 | tMONTH_UNIT { | |
| 376 yyRelMonth += $1; | |
| 377 } | |
| 378 ; | |
| 379 | |
| 380 number : tUNUMBER { | |
| 381 if (yyHaveTime && yyHaveDate && !yyHaveRel) | |
| 382 yyYear = $1; | |
| 383 else { | |
| 384 if($1>10000) { | |
| 385 time_t date_part; | |
| 386 | |
| 387 date_part= $1/10000; | |
| 388 yyHaveDate++; | |
| 389 yyDay= (date_part)%100; | |
| 390 yyMonth= (date_part/100)%100; | |
| 391 yyYear = date_part/10000; | |
| 392 } | |
| 393 yyHaveTime++; | |
| 394 if ($1 < 100) { | |
| 395 yyHour = $1; | |
| 396 yyMinutes = 0; | |
| 397 } | |
| 398 else { | |
| 399 yyHour = $1 / 100; | |
| 400 yyMinutes = $1 % 100; | |
| 401 } | |
| 402 yySeconds = 0; | |
| 403 yyMeridian = MER24; | |
| 404 } | |
| 405 } | |
| 406 ; | |
| 407 | |
| 408 o_merid : /* NULL */ { | |
| 409 $$ = MER24; | |
| 410 } | |
| 411 | tMERIDIAN { | |
| 412 $$ = $1; | |
| 413 } | |
| 414 ; | |
| 415 | |
| 416 %% | |
| 417 | |
| 418 /* Month and day table. */ | |
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419 static TABLE const MonthDayTable[] = { |
| 9 | 420 { "january", tMONTH, 1 }, |
| 421 { "february", tMONTH, 2 }, | |
| 422 { "march", tMONTH, 3 }, | |
| 423 { "april", tMONTH, 4 }, | |
| 424 { "may", tMONTH, 5 }, | |
| 425 { "june", tMONTH, 6 }, | |
| 426 { "july", tMONTH, 7 }, | |
| 427 { "august", tMONTH, 8 }, | |
| 428 { "september", tMONTH, 9 }, | |
| 429 { "sept", tMONTH, 9 }, | |
| 430 { "october", tMONTH, 10 }, | |
| 431 { "november", tMONTH, 11 }, | |
| 432 { "december", tMONTH, 12 }, | |
| 433 { "sunday", tDAY, 0 }, | |
| 434 { "monday", tDAY, 1 }, | |
| 435 { "tuesday", tDAY, 2 }, | |
| 436 { "tues", tDAY, 2 }, | |
| 437 { "wednesday", tDAY, 3 }, | |
| 438 { "wednes", tDAY, 3 }, | |
| 439 { "thursday", tDAY, 4 }, | |
| 440 { "thur", tDAY, 4 }, | |
| 441 { "thurs", tDAY, 4 }, | |
| 442 { "friday", tDAY, 5 }, | |
| 443 { "saturday", tDAY, 6 }, | |
| 444 { NULL } | |
| 445 }; | |
| 446 | |
| 447 /* Time units table. */ | |
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448 static TABLE const UnitsTable[] = { |
| 9 | 449 { "year", tMONTH_UNIT, 12 }, |
| 450 { "month", tMONTH_UNIT, 1 }, | |
| 451 { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, | |
| 452 { "week", tMINUTE_UNIT, 7 * 24 * 60 }, | |
| 453 { "day", tMINUTE_UNIT, 1 * 24 * 60 }, | |
| 454 { "hour", tMINUTE_UNIT, 60 }, | |
| 455 { "minute", tMINUTE_UNIT, 1 }, | |
| 456 { "min", tMINUTE_UNIT, 1 }, | |
| 457 { "second", tSEC_UNIT, 1 }, | |
| 458 { "sec", tSEC_UNIT, 1 }, | |
| 459 { NULL } | |
| 460 }; | |
| 461 | |
| 462 /* Assorted relative-time words. */ | |
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463 static TABLE const OtherTable[] = { |
| 9 | 464 { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, |
| 465 { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, | |
| 466 { "today", tMINUTE_UNIT, 0 }, | |
| 467 { "now", tMINUTE_UNIT, 0 }, | |
| 468 { "last", tUNUMBER, -1 }, | |
| 469 { "this", tMINUTE_UNIT, 0 }, | |
| 470 { "next", tUNUMBER, 2 }, | |
| 471 { "first", tUNUMBER, 1 }, | |
| 472 /* { "second", tUNUMBER, 2 }, */ | |
| 473 { "third", tUNUMBER, 3 }, | |
| 474 { "fourth", tUNUMBER, 4 }, | |
| 475 { "fifth", tUNUMBER, 5 }, | |
| 476 { "sixth", tUNUMBER, 6 }, | |
| 477 { "seventh", tUNUMBER, 7 }, | |
| 478 { "eighth", tUNUMBER, 8 }, | |
| 479 { "ninth", tUNUMBER, 9 }, | |
| 480 { "tenth", tUNUMBER, 10 }, | |
| 481 { "eleventh", tUNUMBER, 11 }, | |
| 482 { "twelfth", tUNUMBER, 12 }, | |
| 483 { "ago", tAGO, 1 }, | |
| 484 { NULL } | |
| 485 }; | |
| 486 | |
| 487 /* The timezone table. */ | |
| 488 /* Some of these are commented out because a time_t can't store a float. */ | |
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489 static TABLE const TimezoneTable[] = { |
| 9 | 490 { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ |
| 491 { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ | |
| 492 { "utc", tZONE, HOUR( 0) }, | |
| 493 { "wet", tZONE, HOUR( 0) }, /* Western European */ | |
| 494 { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ | |
| 495 { "wat", tZONE, HOUR( 1) }, /* West Africa */ | |
| 496 { "at", tZONE, HOUR( 2) }, /* Azores */ | |
| 497 #if 0 | |
| 498 /* For completeness. BST is also British Summer, and GST is | |
| 499 * also Guam Standard. */ | |
| 500 { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ | |
| 501 { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ | |
| 502 #endif | |
| 503 #if 0 | |
| 504 { "nft", tZONE, HOUR(3.5) }, /* Newfoundland */ | |
| 505 { "nst", tZONE, HOUR(3.5) }, /* Newfoundland Standard */ | |
| 506 { "ndt", tDAYZONE, HOUR(3.5) }, /* Newfoundland Daylight */ | |
| 507 #endif | |
| 508 { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ | |
| 509 { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ | |
| 510 { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ | |
| 511 { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ | |
| 512 { "cst", tZONE, HOUR( 6) }, /* Central Standard */ | |
| 513 { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ | |
| 514 { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ | |
| 515 { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ | |
| 516 { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ | |
| 517 { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ | |
| 518 { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ | |
| 519 { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ | |
| 520 { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ | |
| 521 { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ | |
| 522 { "cat", tZONE, HOUR(10) }, /* Central Alaska */ | |
| 523 { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ | |
| 524 { "nt", tZONE, HOUR(11) }, /* Nome */ | |
| 525 { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ | |
| 526 { "cet", tZONE, -HOUR(1) }, /* Central European */ | |
| 527 { "met", tZONE, -HOUR(1) }, /* Middle European */ | |
| 528 { "mewt", tZONE, -HOUR(1) }, /* Middle European Winter */ | |
| 529 { "mest", tDAYZONE, -HOUR(1) }, /* Middle European Summer */ | |
| 530 { "swt", tZONE, -HOUR(1) }, /* Swedish Winter */ | |
| 531 { "sst", tDAYZONE, -HOUR(1) }, /* Swedish Summer */ | |
| 532 { "fwt", tZONE, -HOUR(1) }, /* French Winter */ | |
| 533 { "fst", tDAYZONE, -HOUR(1) }, /* French Summer */ | |
| 534 { "eet", tZONE, -HOUR(2) }, /* Eastern Europe, USSR Zone 1 */ | |
| 535 { "bt", tZONE, -HOUR(3) }, /* Baghdad, USSR Zone 2 */ | |
| 536 #if 0 | |
| 537 { "it", tZONE, -HOUR(3.5) },/* Iran */ | |
| 538 #endif | |
| 539 { "zp4", tZONE, -HOUR(4) }, /* USSR Zone 3 */ | |
| 540 { "zp5", tZONE, -HOUR(5) }, /* USSR Zone 4 */ | |
| 541 #if 0 | |
| 542 { "ist", tZONE, -HOUR(5.5) },/* Indian Standard */ | |
| 543 #endif | |
| 544 { "zp6", tZONE, -HOUR(6) }, /* USSR Zone 5 */ | |
| 545 #if 0 | |
| 546 /* For completeness. NST is also Newfoundland Stanard, and SST is | |
| 547 * also Swedish Summer. */ | |
| 548 { "nst", tZONE, -HOUR(6.5) },/* North Sumatra */ | |
| 549 { "sst", tZONE, -HOUR(7) }, /* South Sumatra, USSR Zone 6 */ | |
| 550 #endif /* 0 */ | |
| 551 { "wast", tZONE, -HOUR(7) }, /* West Australian Standard */ | |
| 552 { "wadt", tDAYZONE, -HOUR(7) }, /* West Australian Daylight */ | |
| 553 #if 0 | |
| 554 { "jt", tZONE, -HOUR(7.5) },/* Java (3pm in Cronusland!) */ | |
| 555 #endif | |
| 556 { "cct", tZONE, -HOUR(8) }, /* China Coast, USSR Zone 7 */ | |
| 557 { "jst", tZONE, -HOUR(9) }, /* Japan Standard, USSR Zone 8 */ | |
| 558 #if 0 | |
| 559 { "cast", tZONE, -HOUR(9.5) },/* Central Australian Standard */ | |
| 560 { "cadt", tDAYZONE, -HOUR(9.5) },/* Central Australian Daylight */ | |
| 561 #endif | |
| 562 { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ | |
| 563 { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ | |
| 564 { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ | |
| 565 { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ | |
| 566 { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ | |
| 567 { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ | |
| 568 { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ | |
| 569 { NULL } | |
| 570 }; | |
| 571 | |
| 572 /* Military timezone table. */ | |
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573 static TABLE const MilitaryTable[] = { |
| 9 | 574 { "a", tZONE, HOUR( 1) }, |
| 575 { "b", tZONE, HOUR( 2) }, | |
| 576 { "c", tZONE, HOUR( 3) }, | |
| 577 { "d", tZONE, HOUR( 4) }, | |
| 578 { "e", tZONE, HOUR( 5) }, | |
| 579 { "f", tZONE, HOUR( 6) }, | |
| 580 { "g", tZONE, HOUR( 7) }, | |
| 581 { "h", tZONE, HOUR( 8) }, | |
| 582 { "i", tZONE, HOUR( 9) }, | |
| 583 { "k", tZONE, HOUR( 10) }, | |
| 584 { "l", tZONE, HOUR( 11) }, | |
| 585 { "m", tZONE, HOUR( 12) }, | |
| 586 { "n", tZONE, HOUR(- 1) }, | |
| 587 { "o", tZONE, HOUR(- 2) }, | |
| 588 { "p", tZONE, HOUR(- 3) }, | |
| 589 { "q", tZONE, HOUR(- 4) }, | |
| 590 { "r", tZONE, HOUR(- 5) }, | |
| 591 { "s", tZONE, HOUR(- 6) }, | |
| 592 { "t", tZONE, HOUR(- 7) }, | |
| 593 { "u", tZONE, HOUR(- 8) }, | |
| 594 { "v", tZONE, HOUR(- 9) }, | |
| 595 { "w", tZONE, HOUR(-10) }, | |
| 596 { "x", tZONE, HOUR(-11) }, | |
| 597 { "y", tZONE, HOUR(-12) }, | |
| 598 { "z", tZONE, HOUR( 0) }, | |
| 599 { NULL } | |
| 600 }; | |
| 601 | |
| 602 | |
| 603 | |
| 604 | |
| 605 /* ARGSUSED */ | |
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606 static int |
| 9 | 607 yyerror(s) |
| 608 char *s; | |
| 609 { | |
| 610 return 0; | |
| 611 } | |
| 612 | |
| 613 | |
| 614 static time_t | |
| 615 ToSeconds(Hours, Minutes, Seconds, Meridian) | |
| 616 time_t Hours; | |
| 617 time_t Minutes; | |
| 618 time_t Seconds; | |
| 619 MERIDIAN Meridian; | |
| 620 { | |
| 621 if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) | |
| 622 return -1; | |
| 623 switch (Meridian) { | |
| 624 case MER24: | |
| 625 if (Hours < 0 || Hours > 23) | |
| 626 return -1; | |
| 627 return (Hours * 60L + Minutes) * 60L + Seconds; | |
| 628 case MERam: | |
| 629 if (Hours < 1 || Hours > 12) | |
| 630 return -1; | |
| 631 return (Hours * 60L + Minutes) * 60L + Seconds; | |
| 632 case MERpm: | |
| 633 if (Hours < 1 || Hours > 12) | |
| 634 return -1; | |
| 635 return ((Hours + 12) * 60L + Minutes) * 60L + Seconds; | |
| 172 | 636 default: |
| 637 abort (); | |
| 9 | 638 } |
| 639 /* NOTREACHED */ | |
| 640 } | |
| 641 | |
| 642 | |
| 643 static time_t | |
| 644 Convert(Month, Day, Year, Hours, Minutes, Seconds, Meridian, DSTmode) | |
| 645 time_t Month; | |
| 646 time_t Day; | |
| 647 time_t Year; | |
| 648 time_t Hours; | |
| 649 time_t Minutes; | |
| 650 time_t Seconds; | |
| 651 MERIDIAN Meridian; | |
| 652 DSTMODE DSTmode; | |
| 653 { | |
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654 static int DaysInMonth[12] = { |
| 9 | 655 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 |
| 656 }; | |
| 657 time_t tod; | |
| 658 time_t Julian; | |
| 659 int i; | |
| 660 | |
| 661 if (Year < 0) | |
| 662 Year = -Year; | |
| 663 if (Year < 100) | |
| 664 Year += 1900; | |
| 665 DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) | |
| 666 ? 29 : 28; | |
| 667 if (Year < EPOCH || Year > 1999 | |
| 668 || Month < 1 || Month > 12 | |
| 669 /* Lint fluff: "conversion from long may lose accuracy" */ | |
| 670 || Day < 1 || Day > DaysInMonth[(int)--Month]) | |
| 671 return -1; | |
| 672 | |
| 673 for (Julian = Day - 1, i = 0; i < Month; i++) | |
| 674 Julian += DaysInMonth[i]; | |
| 675 for (i = EPOCH; i < Year; i++) | |
| 676 Julian += 365 + (i % 4 == 0); | |
| 677 Julian *= SECSPERDAY; | |
| 678 Julian += yyTimezone * 60L; | |
| 679 if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0) | |
| 680 return -1; | |
| 681 Julian += tod; | |
| 682 if (DSTmode == DSTon | |
| 683 || (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst)) | |
| 684 Julian -= 60 * 60; | |
| 685 return Julian; | |
| 686 } | |
| 687 | |
| 688 | |
| 689 static time_t | |
| 690 DSTcorrect(Start, Future) | |
| 691 time_t Start; | |
| 692 time_t Future; | |
| 693 { | |
| 694 time_t StartDay; | |
| 695 time_t FutureDay; | |
| 696 | |
| 697 StartDay = (localtime(&Start)->tm_hour + 1) % 24; | |
| 698 FutureDay = (localtime(&Future)->tm_hour + 1) % 24; | |
| 699 return (Future - Start) + (StartDay - FutureDay) * 60L * 60L; | |
| 700 } | |
| 701 | |
| 702 | |
| 703 static time_t | |
| 704 RelativeDate(Start, DayOrdinal, DayNumber) | |
| 705 time_t Start; | |
| 706 time_t DayOrdinal; | |
| 707 time_t DayNumber; | |
| 708 { | |
| 709 struct tm *tm; | |
| 710 time_t now; | |
| 711 | |
| 712 now = Start; | |
| 713 tm = localtime(&now); | |
| 714 now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7); | |
| 715 now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); | |
| 716 return DSTcorrect(Start, now); | |
| 717 } | |
| 718 | |
| 719 | |
| 720 static time_t | |
| 721 RelativeMonth(Start, RelMonth) | |
| 722 time_t Start; | |
| 723 time_t RelMonth; | |
| 724 { | |
| 725 struct tm *tm; | |
| 726 time_t Month; | |
| 727 time_t Year; | |
| 728 | |
| 729 if (RelMonth == 0) | |
| 730 return 0; | |
| 731 tm = localtime(&Start); | |
| 732 Month = 12 * tm->tm_year + tm->tm_mon + RelMonth; | |
| 733 Year = Month / 12; | |
| 734 Month = Month % 12 + 1; | |
| 735 return DSTcorrect(Start, | |
| 736 Convert(Month, (time_t)tm->tm_mday, Year, | |
| 737 (time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec, | |
| 738 MER24, DSTmaybe)); | |
| 739 } | |
| 740 | |
| 741 | |
| 742 static int | |
| 743 LookupWord(buff) | |
| 744 char *buff; | |
| 745 { | |
| 746 register char *p; | |
| 747 register char *q; | |
|
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748 register const TABLE *tp; |
| 9 | 749 int i; |
| 750 int abbrev; | |
| 751 | |
| 752 /* Make it lowercase. */ | |
| 753 for (p = buff; *p; p++) | |
| 754 if (isupper(*p)) | |
| 755 *p = tolower(*p); | |
| 756 | |
| 757 if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) { | |
| 758 yylval.Meridian = MERam; | |
| 759 return tMERIDIAN; | |
| 760 } | |
| 761 if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) { | |
| 762 yylval.Meridian = MERpm; | |
| 763 return tMERIDIAN; | |
| 764 } | |
| 765 | |
| 766 /* See if we have an abbreviation for a month. */ | |
| 767 if (strlen(buff) == 3) | |
| 768 abbrev = 1; | |
| 769 else if (strlen(buff) == 4 && buff[3] == '.') { | |
| 770 abbrev = 1; | |
| 771 buff[3] = '\0'; | |
| 772 } | |
| 773 else | |
| 774 abbrev = 0; | |
| 775 | |
| 776 for (tp = MonthDayTable; tp->name; tp++) { | |
| 777 if (abbrev) { | |
| 778 if (strncmp(buff, tp->name, 3) == 0) { | |
| 779 yylval.Number = tp->value; | |
| 780 return tp->type; | |
| 781 } | |
| 782 } | |
| 783 else if (strcmp(buff, tp->name) == 0) { | |
| 784 yylval.Number = tp->value; | |
| 785 return tp->type; | |
| 786 } | |
| 787 } | |
| 788 | |
| 789 for (tp = TimezoneTable; tp->name; tp++) | |
| 790 if (strcmp(buff, tp->name) == 0) { | |
| 791 yylval.Number = tp->value; | |
| 792 return tp->type; | |
| 793 } | |
| 794 | |
| 795 if (strcmp(buff, "dst") == 0) | |
| 796 return tDST; | |
| 797 | |
| 798 for (tp = UnitsTable; tp->name; tp++) | |
| 799 if (strcmp(buff, tp->name) == 0) { | |
| 800 yylval.Number = tp->value; | |
| 801 return tp->type; | |
| 802 } | |
| 803 | |
| 804 /* Strip off any plural and try the units table again. */ | |
| 805 i = strlen(buff) - 1; | |
| 806 if (buff[i] == 's') { | |
| 807 buff[i] = '\0'; | |
| 808 for (tp = UnitsTable; tp->name; tp++) | |
| 809 if (strcmp(buff, tp->name) == 0) { | |
| 810 yylval.Number = tp->value; | |
| 811 return tp->type; | |
| 812 } | |
| 813 buff[i] = 's'; /* Put back for "this" in OtherTable. */ | |
| 814 } | |
| 815 | |
| 816 for (tp = OtherTable; tp->name; tp++) | |
| 817 if (strcmp(buff, tp->name) == 0) { | |
| 818 yylval.Number = tp->value; | |
| 819 return tp->type; | |
| 820 } | |
| 821 | |
| 822 /* Military timezones. */ | |
| 823 if (buff[1] == '\0' && isalpha(*buff)) { | |
| 824 for (tp = MilitaryTable; tp->name; tp++) | |
| 825 if (strcmp(buff, tp->name) == 0) { | |
| 826 yylval.Number = tp->value; | |
| 827 return tp->type; | |
| 828 } | |
| 829 } | |
| 830 | |
| 831 /* Drop out any periods and try the timezone table again. */ | |
| 832 for (i = 0, p = q = buff; *q; q++) | |
| 833 if (*q != '.') | |
| 834 *p++ = *q; | |
| 835 else | |
| 836 i++; | |
| 837 *p = '\0'; | |
| 838 if (i) | |
| 839 for (tp = TimezoneTable; tp->name; tp++) | |
| 840 if (strcmp(buff, tp->name) == 0) { | |
| 841 yylval.Number = tp->value; | |
| 842 return tp->type; | |
| 843 } | |
| 844 | |
| 845 return tID; | |
| 846 } | |
| 847 | |
| 848 | |
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849 static int |
| 9 | 850 yylex() |
| 851 { | |
| 852 register char c; | |
| 853 register char *p; | |
| 854 char buff[20]; | |
| 855 int Count; | |
| 856 int sign; | |
| 857 | |
| 858 for ( ; ; ) { | |
| 859 while (isspace(*yyInput)) | |
| 860 yyInput++; | |
| 861 | |
| 862 if (isdigit(c = *yyInput) || c == '-' || c == '+') { | |
| 863 if (c == '-' || c == '+') { | |
| 864 sign = c == '-' ? -1 : 1; | |
| 865 if (!isdigit(*++yyInput)) | |
| 866 /* skip the '-' sign */ | |
| 867 continue; | |
| 868 } | |
| 869 else | |
| 870 sign = 0; | |
| 871 for (yylval.Number = 0; isdigit(c = *yyInput++); ) | |
| 872 yylval.Number = 10 * yylval.Number + c - '0'; | |
| 873 yyInput--; | |
| 874 if (sign < 0) | |
| 875 yylval.Number = -yylval.Number; | |
| 876 return sign ? tSNUMBER : tUNUMBER; | |
| 877 } | |
| 878 if (isalpha(c)) { | |
| 879 for (p = buff; isalpha(c = *yyInput++) || c == '.'; ) | |
| 880 if (p < &buff[sizeof buff - 1]) | |
| 881 *p++ = c; | |
| 882 *p = '\0'; | |
| 883 yyInput--; | |
| 884 return LookupWord(buff); | |
| 885 } | |
| 886 if (c != '(') | |
| 887 return *yyInput++; | |
| 888 Count = 0; | |
| 889 do { | |
| 890 c = *yyInput++; | |
| 891 if (c == '\0') | |
| 892 return c; | |
| 893 if (c == '(') | |
| 894 Count++; | |
| 895 else if (c == ')') | |
| 896 Count--; | |
| 897 } while (Count > 0); | |
| 898 } | |
| 899 } | |
| 900 | |
| 901 | |
|
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902 #define TM_YEAR_ORIGIN 1900 |
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903 |
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904 /* Yield A - B, measured in seconds. */ |
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905 static time_t |
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906 difftm(a, b) |
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907 struct tm *a, *b; |
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908 { |
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909 int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); |
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910 int by = b->tm_year + (TM_YEAR_ORIGIN - 1); |
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911 return |
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912 ( |
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913 ( |
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914 ( |
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915 /* difference in day of year */ |
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916 a->tm_yday - b->tm_yday |
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917 /* + intervening leap days */ |
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918 + ((ay >> 2) - (by >> 2)) |
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919 - (ay/100 - by/100) |
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920 + ((ay/100 >> 2) - (by/100 >> 2)) |
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921 /* + difference in years * 365 */ |
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922 + (time_t)(ay-by) * 365 |
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923 )*24 + (a->tm_hour - b->tm_hour) |
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924 )*60 + (a->tm_min - b->tm_min) |
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925 )*60 + (a->tm_sec - b->tm_sec); |
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926 } |
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927 |
| 9 | 928 time_t |
| 929 get_date(p, now) | |
| 930 char *p; | |
| 931 struct timeb *now; | |
| 932 { | |
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933 struct tm *tm, gmt; |
| 9 | 934 struct timeb ftz; |
| 935 time_t Start; | |
| 936 time_t tod; | |
| 937 | |
| 938 yyInput = p; | |
| 939 if (now == NULL) { | |
| 940 now = &ftz; | |
| 941 (void)time(&ftz.time); | |
| 942 | |
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943 if (! (tm = gmtime (&ftz.time))) |
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944 return -1; |
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945 gmt = *tm; /* Make a copy, in case localtime modifies *tm. */ |
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946 ftz.timezone = difftm (&gmt, localtime (&ftz.time)) / 60; |
| 9 | 947 } |
| 948 | |
| 949 tm = localtime(&now->time); | |
| 950 yyYear = tm->tm_year; | |
| 951 yyMonth = tm->tm_mon + 1; | |
| 952 yyDay = tm->tm_mday; | |
| 953 yyTimezone = now->timezone; | |
| 954 yyDSTmode = DSTmaybe; | |
| 955 yyHour = 0; | |
| 956 yyMinutes = 0; | |
| 957 yySeconds = 0; | |
| 958 yyMeridian = MER24; | |
| 959 yyRelSeconds = 0; | |
| 960 yyRelMonth = 0; | |
| 961 yyHaveDate = 0; | |
| 962 yyHaveDay = 0; | |
| 963 yyHaveRel = 0; | |
| 964 yyHaveTime = 0; | |
| 965 yyHaveZone = 0; | |
| 966 | |
| 967 if (yyparse() | |
| 968 || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || yyHaveDay > 1) | |
| 969 return -1; | |
| 970 | |
| 971 if (yyHaveDate || yyHaveTime || yyHaveDay) { | |
| 972 Start = Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds, | |
| 973 yyMeridian, yyDSTmode); | |
| 974 if (Start < 0) | |
| 975 return -1; | |
| 976 } | |
| 977 else { | |
| 978 Start = now->time; | |
| 979 if (!yyHaveRel) | |
| 980 Start -= ((tm->tm_hour * 60L + tm->tm_min) * 60L) + tm->tm_sec; | |
| 981 } | |
| 982 | |
| 983 Start += yyRelSeconds; | |
| 984 Start += RelativeMonth(Start, yyRelMonth); | |
| 985 | |
| 986 if (yyHaveDay && !yyHaveDate) { | |
| 987 tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); | |
| 988 Start += tod; | |
| 989 } | |
| 990 | |
| 991 /* Have to do *something* with a legitimate -1 so it's distinguishable | |
| 992 * from the error return value. (Alternately could set errno on error.) */ | |
| 993 return Start == -1 ? 0 : Start; | |
| 994 } | |
| 995 | |
| 996 | |
| 997 #if defined(TEST) | |
| 998 | |
| 999 /* ARGSUSED */ | |
| 1000 main(ac, av) | |
| 1001 int ac; | |
| 1002 char *av[]; | |
| 1003 { | |
| 1004 char buff[128]; | |
| 1005 time_t d; | |
| 1006 | |
| 1007 (void)printf("Enter date, or blank line to exit.\n\t> "); | |
| 1008 (void)fflush(stdout); | |
| 1009 while (gets(buff) && buff[0]) { | |
| 1010 d = get_date(buff, (struct timeb *)NULL); | |
| 1011 if (d == -1) | |
| 1012 (void)printf("Bad format - couldn't convert.\n"); | |
| 1013 else | |
| 1014 (void)printf("%s", ctime(&d)); | |
| 1015 (void)printf("\t> "); | |
| 1016 (void)fflush(stdout); | |
| 1017 } | |
| 1018 exit(0); | |
| 1019 /* NOTREACHED */ | |
| 1020 } | |
| 1021 #endif /* defined(TEST) */ |