| 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2, or (at your option) |
| 6 | * any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this software; see the file COPYING. If not, write to |
| 15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
| 16 | * Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | * As a special exception, the Free Software Foundation gives permission |
| 19 | * for additional uses of the text contained in its release of GUILE. |
| 20 | * |
| 21 | * The exception is that, if you link the GUILE library with other files |
| 22 | * to produce an executable, this does not by itself cause the |
| 23 | * resulting executable to be covered by the GNU General Public License. |
| 24 | * Your use of that executable is in no way restricted on account of |
| 25 | * linking the GUILE library code into it. |
| 26 | * |
| 27 | * This exception does not however invalidate any other reasons why |
| 28 | * the executable file might be covered by the GNU General Public License. |
| 29 | * |
| 30 | * This exception applies only to the code released by the |
| 31 | * Free Software Foundation under the name GUILE. If you copy |
| 32 | * code from other Free Software Foundation releases into a copy of |
| 33 | * GUILE, as the General Public License permits, the exception does |
| 34 | * not apply to the code that you add in this way. To avoid misleading |
| 35 | * anyone as to the status of such modified files, you must delete |
| 36 | * this exception notice from them. |
| 37 | * |
| 38 | * If you write modifications of your own for GUILE, it is your choice |
| 39 | * whether to permit this exception to apply to your modifications. |
| 40 | * If you do not wish that, delete this exception notice. */ |
| 41 | |
| 42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, |
| 43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ |
| 44 | |
| 45 | \f |
| 46 | |
| 47 | #include <stdio.h> |
| 48 | #include <errno.h> |
| 49 | |
| 50 | #include "libguile/_scm.h" |
| 51 | #include "libguile/feature.h" |
| 52 | #include "libguile/strings.h" |
| 53 | #include "libguile/vectors.h" |
| 54 | |
| 55 | #include "libguile/validate.h" |
| 56 | #include "libguile/stime.h" |
| 57 | |
| 58 | #ifdef HAVE_UNISTD_H |
| 59 | #include <unistd.h> |
| 60 | #endif |
| 61 | |
| 62 | \f |
| 63 | # ifdef HAVE_SYS_TYPES_H |
| 64 | # include <sys/types.h> |
| 65 | # endif |
| 66 | |
| 67 | #ifdef HAVE_STRING_H |
| 68 | #include <string.h> |
| 69 | #endif |
| 70 | |
| 71 | # ifdef TIME_WITH_SYS_TIME |
| 72 | # include <sys/time.h> |
| 73 | # include <time.h> |
| 74 | # else |
| 75 | # ifdef HAVE_SYS_TIME_H |
| 76 | # include <sys/time.h> |
| 77 | # else |
| 78 | # ifdef HAVE_TIME_H |
| 79 | # include <time.h> |
| 80 | # endif |
| 81 | # endif |
| 82 | # endif |
| 83 | |
| 84 | #ifdef HAVE_SYS_TIMES_H |
| 85 | # include <sys/times.h> |
| 86 | #endif |
| 87 | |
| 88 | #ifdef HAVE_SYS_TIMEB_H |
| 89 | # include <sys/timeb.h> |
| 90 | #endif |
| 91 | |
| 92 | #ifndef tzname /* For SGI. */ |
| 93 | extern char *tzname[]; /* RS6000 and others reject char **tzname. */ |
| 94 | #endif |
| 95 | |
| 96 | #ifdef MISSING_STRPTIME_DECL |
| 97 | extern char *strptime (); |
| 98 | #endif |
| 99 | |
| 100 | /* This should be figured out by autoconf. */ |
| 101 | #if ! defined(CLKTCK) && defined(CLK_TCK) |
| 102 | # define CLKTCK CLK_TCK |
| 103 | #endif |
| 104 | #if ! defined(CLKTCK) && defined(CLOCKS_PER_SEC) |
| 105 | # define CLKTCK CLOCKS_PER_SEC |
| 106 | #endif |
| 107 | #if ! defined(CLKTCK) |
| 108 | # define CLKTCK 60 |
| 109 | #endif |
| 110 | |
| 111 | #ifdef __STDC__ |
| 112 | # define timet time_t |
| 113 | #else |
| 114 | # define timet long |
| 115 | #endif |
| 116 | |
| 117 | #ifdef HAVE_TIMES |
| 118 | static |
| 119 | timet mytime() |
| 120 | { |
| 121 | struct tms time_buffer; |
| 122 | times(&time_buffer); |
| 123 | return time_buffer.tms_utime + time_buffer.tms_stime; |
| 124 | } |
| 125 | #else |
| 126 | # ifdef LACK_CLOCK |
| 127 | # define mytime() ((time((timet*)0) - scm_your_base) * CLKTCK) |
| 128 | # else |
| 129 | # define mytime clock |
| 130 | # endif |
| 131 | #endif |
| 132 | |
| 133 | #ifdef HAVE_FTIME |
| 134 | struct timeb scm_your_base = {0}; |
| 135 | #else |
| 136 | timet scm_your_base = 0; |
| 137 | #endif |
| 138 | |
| 139 | SCM_DEFINE (scm_get_internal_real_time, "get-internal-real-time", 0, 0, 0, |
| 140 | (), |
| 141 | "Return the number of time units since the interpreter was\n" |
| 142 | "started.") |
| 143 | #define FUNC_NAME s_scm_get_internal_real_time |
| 144 | { |
| 145 | #ifdef HAVE_FTIME |
| 146 | struct timeb time_buffer; |
| 147 | |
| 148 | SCM tmp; |
| 149 | ftime (&time_buffer); |
| 150 | time_buffer.time -= scm_your_base.time; |
| 151 | tmp = scm_long2num (time_buffer.millitm - scm_your_base.millitm); |
| 152 | tmp = scm_sum (tmp, |
| 153 | scm_product (SCM_MAKINUM (1000), |
| 154 | SCM_MAKINUM (time_buffer.time))); |
| 155 | return scm_quotient (scm_product (tmp, SCM_MAKINUM (CLKTCK)), |
| 156 | SCM_MAKINUM (1000)); |
| 157 | #else |
| 158 | return scm_long2num((time((timet*)0) - scm_your_base) * (int)CLKTCK); |
| 159 | #endif /* HAVE_FTIME */ |
| 160 | } |
| 161 | #undef FUNC_NAME |
| 162 | |
| 163 | |
| 164 | #ifdef HAVE_TIMES |
| 165 | SCM_DEFINE (scm_times, "times", 0, 0, 0, |
| 166 | (void), |
| 167 | "Return an object with information about real and processor\n" |
| 168 | "time. The following procedures accept such an object as an\n" |
| 169 | "argument and return a selected component:\n" |
| 170 | "\n" |
| 171 | "@table @code\n" |
| 172 | "@item tms:clock\n" |
| 173 | "The current real time, expressed as time units relative to an\n" |
| 174 | "arbitrary base.\n" |
| 175 | "@item tms:utime\n" |
| 176 | "The CPU time units used by the calling process.\n" |
| 177 | "@item tms:stime\n" |
| 178 | "The CPU time units used by the system on behalf of the calling\n" |
| 179 | "process.\n" |
| 180 | "@item tms:cutime\n" |
| 181 | "The CPU time units used by terminated child processes of the\n" |
| 182 | "calling process, whose status has been collected (e.g., using\n" |
| 183 | "@code{waitpid}).\n" |
| 184 | "@item tms:cstime\n" |
| 185 | "Similarly, the CPU times units used by the system on behalf of\n" |
| 186 | "terminated child processes.\n" |
| 187 | "@end table") |
| 188 | #define FUNC_NAME s_scm_times |
| 189 | { |
| 190 | struct tms t; |
| 191 | clock_t rv; |
| 192 | |
| 193 | SCM result = scm_c_make_vector (5, SCM_UNDEFINED); |
| 194 | rv = times (&t); |
| 195 | if (rv == -1) |
| 196 | SCM_SYSERROR; |
| 197 | SCM_VELTS (result)[0] = scm_long2num (rv); |
| 198 | SCM_VELTS (result)[1] = scm_long2num (t.tms_utime); |
| 199 | SCM_VELTS (result)[2] = scm_long2num (t.tms_stime); |
| 200 | SCM_VELTS (result)[3] = scm_long2num (t.tms_cutime); |
| 201 | SCM_VELTS (result)[4] = scm_long2num (t.tms_cstime); |
| 202 | return result; |
| 203 | } |
| 204 | #undef FUNC_NAME |
| 205 | #endif /* HAVE_TIMES */ |
| 206 | |
| 207 | static long scm_my_base = 0; |
| 208 | |
| 209 | long |
| 210 | scm_c_get_internal_run_time () |
| 211 | { |
| 212 | return mytime () - scm_my_base; |
| 213 | } |
| 214 | |
| 215 | SCM_DEFINE (scm_get_internal_run_time, "get-internal-run-time", 0, 0, 0, |
| 216 | (void), |
| 217 | "Return the number of time units of processor time used by the\n" |
| 218 | "interpreter. Both @emph{system} and @emph{user} time are\n" |
| 219 | "included but subprocesses are not.") |
| 220 | #define FUNC_NAME s_scm_get_internal_run_time |
| 221 | { |
| 222 | return scm_long2num (scm_c_get_internal_run_time ()); |
| 223 | } |
| 224 | #undef FUNC_NAME |
| 225 | |
| 226 | SCM_DEFINE (scm_current_time, "current-time", 0, 0, 0, |
| 227 | (void), |
| 228 | "Return the number of seconds since 1970-01-01 00:00:00 UTC,\n" |
| 229 | "excluding leap seconds.") |
| 230 | #define FUNC_NAME s_scm_current_time |
| 231 | { |
| 232 | timet timv; |
| 233 | |
| 234 | SCM_DEFER_INTS; |
| 235 | if ((timv = time (0)) == -1) |
| 236 | SCM_SYSERROR; |
| 237 | SCM_ALLOW_INTS; |
| 238 | return scm_long2num((long) timv); |
| 239 | } |
| 240 | #undef FUNC_NAME |
| 241 | |
| 242 | SCM_DEFINE (scm_gettimeofday, "gettimeofday", 0, 0, 0, |
| 243 | (void), |
| 244 | "Return a pair containing the number of seconds and microseconds\n" |
| 245 | "since 1970-01-01 00:00:00 UTC, excluding leap seconds. Note:\n" |
| 246 | "whether true microsecond resolution is available depends on the\n" |
| 247 | "operating system.") |
| 248 | #define FUNC_NAME s_scm_gettimeofday |
| 249 | { |
| 250 | #ifdef HAVE_GETTIMEOFDAY |
| 251 | struct timeval time; |
| 252 | |
| 253 | SCM_DEFER_INTS; |
| 254 | if (gettimeofday (&time, NULL) == -1) |
| 255 | SCM_SYSERROR; |
| 256 | SCM_ALLOW_INTS; |
| 257 | return scm_cons (scm_long2num ((long) time.tv_sec), |
| 258 | scm_long2num ((long) time.tv_usec)); |
| 259 | #else |
| 260 | # ifdef HAVE_FTIME |
| 261 | struct timeb time; |
| 262 | |
| 263 | ftime(&time); |
| 264 | return scm_cons (scm_long2num ((long) time.time), |
| 265 | SCM_MAKINUM (time.millitm * 1000)); |
| 266 | # else |
| 267 | timet timv; |
| 268 | |
| 269 | SCM_DEFER_INTS; |
| 270 | if ((timv = time (0)) == -1) |
| 271 | SCM_SYSERROR; |
| 272 | SCM_ALLOW_INTS; |
| 273 | return scm_cons (scm_long2num (timv), SCM_MAKINUM (0)); |
| 274 | # endif |
| 275 | #endif |
| 276 | } |
| 277 | #undef FUNC_NAME |
| 278 | |
| 279 | static SCM |
| 280 | filltime (struct tm *bd_time, int zoff, char *zname) |
| 281 | { |
| 282 | SCM result = scm_c_make_vector (11, SCM_UNDEFINED); |
| 283 | |
| 284 | SCM_VELTS (result)[0] = SCM_MAKINUM (bd_time->tm_sec); |
| 285 | SCM_VELTS (result)[1] = SCM_MAKINUM (bd_time->tm_min); |
| 286 | SCM_VELTS (result)[2] = SCM_MAKINUM (bd_time->tm_hour); |
| 287 | SCM_VELTS (result)[3] = SCM_MAKINUM (bd_time->tm_mday); |
| 288 | SCM_VELTS (result)[4] = SCM_MAKINUM (bd_time->tm_mon); |
| 289 | SCM_VELTS (result)[5] = SCM_MAKINUM (bd_time->tm_year); |
| 290 | SCM_VELTS (result)[6] = SCM_MAKINUM (bd_time->tm_wday); |
| 291 | SCM_VELTS (result)[7] = SCM_MAKINUM (bd_time->tm_yday); |
| 292 | SCM_VELTS (result)[8] = SCM_MAKINUM (bd_time->tm_isdst); |
| 293 | SCM_VELTS (result)[9] = SCM_MAKINUM (zoff); |
| 294 | SCM_VELTS (result)[10] = zname ? scm_makfrom0str (zname) : SCM_BOOL_F; |
| 295 | return result; |
| 296 | } |
| 297 | |
| 298 | static char tzvar[3] = "TZ"; |
| 299 | extern char ** environ; |
| 300 | |
| 301 | /* if zone is set, create a temporary environment with only a TZ |
| 302 | string. other threads or interrupt handlers shouldn't be allowed |
| 303 | to run until the corresponding restorezone is called. hence the use |
| 304 | of a static variable for tmpenv is no big deal. */ |
| 305 | static char ** |
| 306 | setzone (SCM zone, int pos, const char *subr) |
| 307 | { |
| 308 | char **oldenv = 0; |
| 309 | |
| 310 | if (!SCM_UNBNDP (zone)) |
| 311 | { |
| 312 | static char *tmpenv[2]; |
| 313 | char *buf; |
| 314 | |
| 315 | SCM_ASSERT (SCM_STRINGP (zone), zone, pos, subr); |
| 316 | SCM_STRING_COERCE_0TERMINATION_X (zone); |
| 317 | buf = scm_must_malloc (SCM_STRING_LENGTH (zone) + sizeof (tzvar) + 1, subr); |
| 318 | sprintf (buf, "%s=%s", tzvar, SCM_STRING_CHARS (zone)); |
| 319 | oldenv = environ; |
| 320 | tmpenv[0] = buf; |
| 321 | tmpenv[1] = 0; |
| 322 | environ = tmpenv; |
| 323 | } |
| 324 | return oldenv; |
| 325 | } |
| 326 | |
| 327 | static void |
| 328 | restorezone (SCM zone, char **oldenv, const char *subr SCM_UNUSED) |
| 329 | { |
| 330 | if (!SCM_UNBNDP (zone)) |
| 331 | { |
| 332 | scm_must_free (environ[0]); |
| 333 | environ = oldenv; |
| 334 | #ifdef HAVE_TZSET |
| 335 | /* for the possible benefit of user code linked with libguile. */ |
| 336 | tzset(); |
| 337 | #endif |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | SCM_DEFINE (scm_localtime, "localtime", 1, 1, 0, |
| 342 | (SCM time, SCM zone), |
| 343 | "Return an object representing the broken down components of\n" |
| 344 | "@var{time}, an integer like the one returned by\n" |
| 345 | "@code{current-time}. The time zone for the calculation is\n" |
| 346 | "optionally specified by @var{zone} (a string), otherwise the\n" |
| 347 | "@code{TZ} environment variable or the system default is used.") |
| 348 | #define FUNC_NAME s_scm_localtime |
| 349 | { |
| 350 | timet itime; |
| 351 | struct tm *ltptr, lt, *utc; |
| 352 | SCM result; |
| 353 | int zoff; |
| 354 | char *zname = 0; |
| 355 | char **oldenv; |
| 356 | int err; |
| 357 | |
| 358 | itime = SCM_NUM2LONG (1, time); |
| 359 | |
| 360 | /* deferring interupts is essential since a) setzone may install a temporary |
| 361 | environment b) localtime uses a static buffer. */ |
| 362 | SCM_DEFER_INTS; |
| 363 | oldenv = setzone (zone, SCM_ARG2, FUNC_NAME); |
| 364 | #ifdef LOCALTIME_CACHE |
| 365 | tzset (); |
| 366 | #endif |
| 367 | ltptr = localtime (&itime); |
| 368 | err = errno; |
| 369 | if (ltptr) |
| 370 | { |
| 371 | const char *ptr; |
| 372 | |
| 373 | /* copy zone name before calling gmtime or restoring zone. */ |
| 374 | #if defined (HAVE_TM_ZONE) |
| 375 | ptr = ltptr->tm_zone; |
| 376 | #elif defined (HAVE_TZNAME) |
| 377 | ptr = tzname[ (ltptr->tm_isdst == 1) ? 1 : 0 ]; |
| 378 | #else |
| 379 | ptr = ""; |
| 380 | #endif |
| 381 | zname = SCM_MUST_MALLOC (strlen (ptr) + 1); |
| 382 | strcpy (zname, ptr); |
| 383 | } |
| 384 | /* the struct is copied in case localtime and gmtime share a buffer. */ |
| 385 | if (ltptr) |
| 386 | lt = *ltptr; |
| 387 | utc = gmtime (&itime); |
| 388 | if (utc == NULL) |
| 389 | err = errno; |
| 390 | restorezone (zone, oldenv, FUNC_NAME); |
| 391 | /* delayed until zone has been restored. */ |
| 392 | errno = err; |
| 393 | if (utc == NULL || ltptr == NULL) |
| 394 | SCM_SYSERROR; |
| 395 | |
| 396 | /* calculate timezone offset in seconds west of UTC. */ |
| 397 | zoff = (utc->tm_hour - lt.tm_hour) * 3600 + (utc->tm_min - lt.tm_min) * 60 |
| 398 | + utc->tm_sec - lt.tm_sec; |
| 399 | if (utc->tm_year < lt.tm_year) |
| 400 | zoff -= 24 * 60 * 60; |
| 401 | else if (utc->tm_year > lt.tm_year) |
| 402 | zoff += 24 * 60 * 60; |
| 403 | else if (utc->tm_yday < lt.tm_yday) |
| 404 | zoff -= 24 * 60 * 60; |
| 405 | else if (utc->tm_yday > lt.tm_yday) |
| 406 | zoff += 24 * 60 * 60; |
| 407 | |
| 408 | result = filltime (<, zoff, zname); |
| 409 | SCM_ALLOW_INTS; |
| 410 | scm_must_free (zname); |
| 411 | return result; |
| 412 | } |
| 413 | #undef FUNC_NAME |
| 414 | |
| 415 | SCM_DEFINE (scm_gmtime, "gmtime", 1, 0, 0, |
| 416 | (SCM time), |
| 417 | "Return an object representing the broken down components of\n" |
| 418 | "@var{time}, an integer like the one returned by\n" |
| 419 | "@code{current-time}. The values are calculated for UTC.") |
| 420 | #define FUNC_NAME s_scm_gmtime |
| 421 | { |
| 422 | timet itime; |
| 423 | struct tm *bd_time; |
| 424 | SCM result; |
| 425 | |
| 426 | itime = SCM_NUM2LONG (1, time); |
| 427 | SCM_DEFER_INTS; |
| 428 | bd_time = gmtime (&itime); |
| 429 | if (bd_time == NULL) |
| 430 | SCM_SYSERROR; |
| 431 | result = filltime (bd_time, 0, "GMT"); |
| 432 | SCM_ALLOW_INTS; |
| 433 | return result; |
| 434 | } |
| 435 | #undef FUNC_NAME |
| 436 | |
| 437 | /* copy time components from a Scheme object to a struct tm. */ |
| 438 | static void |
| 439 | bdtime2c (SCM sbd_time, struct tm *lt, int pos, const char *subr) |
| 440 | { |
| 441 | SCM *velts; |
| 442 | int i; |
| 443 | |
| 444 | SCM_ASSERT (SCM_VECTORP (sbd_time) |
| 445 | && SCM_VECTOR_LENGTH (sbd_time) == 11, |
| 446 | sbd_time, pos, subr); |
| 447 | velts = SCM_VELTS (sbd_time); |
| 448 | for (i = 0; i < 10; i++) |
| 449 | { |
| 450 | SCM_ASSERT (SCM_INUMP (velts[i]), sbd_time, pos, subr); |
| 451 | } |
| 452 | SCM_ASSERT (SCM_FALSEP (velts[10]) || SCM_STRINGP (velts[10]), |
| 453 | sbd_time, pos, subr); |
| 454 | |
| 455 | lt->tm_sec = SCM_INUM (velts[0]); |
| 456 | lt->tm_min = SCM_INUM (velts[1]); |
| 457 | lt->tm_hour = SCM_INUM (velts[2]); |
| 458 | lt->tm_mday = SCM_INUM (velts[3]); |
| 459 | lt->tm_mon = SCM_INUM (velts[4]); |
| 460 | lt->tm_year = SCM_INUM (velts[5]); |
| 461 | lt->tm_wday = SCM_INUM (velts[6]); |
| 462 | lt->tm_yday = SCM_INUM (velts[7]); |
| 463 | lt->tm_isdst = SCM_INUM (velts[8]); |
| 464 | #ifdef HAVE_TM_ZONE |
| 465 | lt->tm_gmtoff = SCM_INUM (velts[9]); |
| 466 | if (SCM_FALSEP (velts[10])) |
| 467 | lt->tm_zone = NULL; |
| 468 | else |
| 469 | lt->tm_zone = SCM_STRING_CHARS (velts[10]); |
| 470 | #endif |
| 471 | } |
| 472 | |
| 473 | SCM_DEFINE (scm_mktime, "mktime", 1, 1, 0, |
| 474 | (SCM sbd_time, SCM zone), |
| 475 | "@var{bd-time} is an object representing broken down time and @code{zone}\n" |
| 476 | "is an optional time zone specifier (otherwise the TZ environment variable\n" |
| 477 | "or the system default is used).\n\n" |
| 478 | "Returns a pair: the car is a corresponding\n" |
| 479 | "integer time value like that returned\n" |
| 480 | "by @code{current-time}; the cdr is a broken down time object, similar to\n" |
| 481 | "as @var{bd-time} but with normalized values.") |
| 482 | #define FUNC_NAME s_scm_mktime |
| 483 | { |
| 484 | timet itime; |
| 485 | struct tm lt, *utc; |
| 486 | SCM result; |
| 487 | int zoff; |
| 488 | char *zname = 0; |
| 489 | char **oldenv; |
| 490 | int err; |
| 491 | |
| 492 | bdtime2c (sbd_time, <, SCM_ARG1, FUNC_NAME); |
| 493 | |
| 494 | SCM_DEFER_INTS; |
| 495 | oldenv = setzone (zone, SCM_ARG2, FUNC_NAME); |
| 496 | #ifdef LOCALTIME_CACHE |
| 497 | tzset (); |
| 498 | #endif |
| 499 | itime = mktime (<); |
| 500 | err = errno; |
| 501 | |
| 502 | if (itime != -1) |
| 503 | { |
| 504 | const char *ptr; |
| 505 | |
| 506 | /* copy zone name before calling gmtime or restoring the zone. */ |
| 507 | #if defined (HAVE_TM_ZONE) |
| 508 | ptr = lt.tm_zone; |
| 509 | #elif defined (HAVE_TZNAME) |
| 510 | ptr = tzname[ (lt.tm_isdst == 1) ? 1 : 0 ]; |
| 511 | #else |
| 512 | ptr = ""; |
| 513 | #endif |
| 514 | zname = SCM_MUST_MALLOC (strlen (ptr) + 1); |
| 515 | strcpy (zname, ptr); |
| 516 | } |
| 517 | |
| 518 | /* get timezone offset in seconds west of UTC. */ |
| 519 | utc = gmtime (&itime); |
| 520 | if (utc == NULL) |
| 521 | err = errno; |
| 522 | |
| 523 | restorezone (zone, oldenv, FUNC_NAME); |
| 524 | /* delayed until zone has been restored. */ |
| 525 | errno = err; |
| 526 | if (utc == NULL || itime == -1) |
| 527 | SCM_SYSERROR; |
| 528 | |
| 529 | zoff = (utc->tm_hour - lt.tm_hour) * 3600 + (utc->tm_min - lt.tm_min) * 60 |
| 530 | + utc->tm_sec - lt.tm_sec; |
| 531 | if (utc->tm_year < lt.tm_year) |
| 532 | zoff -= 24 * 60 * 60; |
| 533 | else if (utc->tm_year > lt.tm_year) |
| 534 | zoff += 24 * 60 * 60; |
| 535 | else if (utc->tm_yday < lt.tm_yday) |
| 536 | zoff -= 24 * 60 * 60; |
| 537 | else if (utc->tm_yday > lt.tm_yday) |
| 538 | zoff += 24 * 60 * 60; |
| 539 | |
| 540 | result = scm_cons (scm_long2num ((long) itime), |
| 541 | filltime (<, zoff, zname)); |
| 542 | SCM_ALLOW_INTS; |
| 543 | scm_must_free (zname); |
| 544 | return result; |
| 545 | } |
| 546 | #undef FUNC_NAME |
| 547 | |
| 548 | #ifdef HAVE_TZSET |
| 549 | SCM_DEFINE (scm_tzset, "tzset", 0, 0, 0, |
| 550 | (void), |
| 551 | "Initialize the timezone from the TZ environment variable\n" |
| 552 | "or the system default. It's not usually necessary to call this procedure\n" |
| 553 | "since it's done automatically by other procedures that depend on the\n" |
| 554 | "timezone.") |
| 555 | #define FUNC_NAME s_scm_tzset |
| 556 | { |
| 557 | tzset(); |
| 558 | return SCM_UNSPECIFIED; |
| 559 | } |
| 560 | #undef FUNC_NAME |
| 561 | #endif /* HAVE_TZSET */ |
| 562 | |
| 563 | SCM_DEFINE (scm_strftime, "strftime", 2, 0, 0, |
| 564 | (SCM format, SCM stime), |
| 565 | "Formats a time specification @var{time} using @var{template}. @var{time}\n" |
| 566 | "is an object with time components in the form returned by @code{localtime}\n" |
| 567 | "or @code{gmtime}. @var{template} is a string which can include formatting\n" |
| 568 | "specifications introduced by a @code{%} character. The formatting of\n" |
| 569 | "month and day names is dependent on the current locale. The value returned\n" |
| 570 | "is the formatted string.\n" |
| 571 | "@xref{Formatting Date and Time, , , libc, The GNU C Library Reference Manual}.)") |
| 572 | #define FUNC_NAME s_scm_strftime |
| 573 | { |
| 574 | struct tm t; |
| 575 | |
| 576 | char *tbuf; |
| 577 | int size = 50; |
| 578 | char *fmt, *myfmt; |
| 579 | int len; |
| 580 | SCM result; |
| 581 | |
| 582 | SCM_VALIDATE_STRING (1, format); |
| 583 | bdtime2c (stime, &t, SCM_ARG2, FUNC_NAME); |
| 584 | |
| 585 | SCM_STRING_COERCE_0TERMINATION_X (format); |
| 586 | fmt = SCM_STRING_CHARS (format); |
| 587 | len = SCM_STRING_LENGTH (format); |
| 588 | |
| 589 | /* Ugly hack: strftime can return 0 if its buffer is too small, |
| 590 | but some valid time strings (e.g. "%p") can sometimes produce |
| 591 | a zero-byte output string! Workaround is to prepend a junk |
| 592 | character to the format string, so that valid returns are always |
| 593 | nonzero. */ |
| 594 | myfmt = SCM_MUST_MALLOC (len+2); |
| 595 | *myfmt = 'x'; |
| 596 | strncpy(myfmt+1, fmt, len); |
| 597 | myfmt[len+1] = 0; |
| 598 | |
| 599 | tbuf = SCM_MUST_MALLOC (size); |
| 600 | { |
| 601 | #if !defined (HAVE_TM_ZONE) |
| 602 | /* it seems the only way to tell non-GNU versions of strftime what |
| 603 | zone to use (for the %Z format) is to set TZ in the |
| 604 | environment. interrupts and thread switching must be deferred |
| 605 | until TZ is restored. */ |
| 606 | char **oldenv = NULL; |
| 607 | SCM *velts = SCM_VELTS (stime); |
| 608 | int have_zone = 0; |
| 609 | |
| 610 | if (!SCM_FALSEP (velts[10]) && *SCM_STRING_CHARS (velts[10]) != 0) |
| 611 | { |
| 612 | /* it's not required that the TZ setting be correct, just that |
| 613 | it has the right name. so try something like TZ=EST0. |
| 614 | using only TZ=EST would be simpler but it doesn't work on |
| 615 | some OSs, e.g., Solaris. */ |
| 616 | SCM zone = |
| 617 | scm_string_append (scm_cons (velts[10], |
| 618 | scm_cons (scm_makfrom0str ("0"), |
| 619 | SCM_EOL))); |
| 620 | |
| 621 | have_zone = 1; |
| 622 | SCM_DEFER_INTS; |
| 623 | oldenv = setzone (zone, SCM_ARG2, FUNC_NAME); |
| 624 | } |
| 625 | #endif |
| 626 | |
| 627 | #ifdef LOCALTIME_CACHE |
| 628 | tzset (); |
| 629 | #endif |
| 630 | |
| 631 | /* POSIX says strftime returns 0 on buffer overrun, but old |
| 632 | systems (i.e. libc 4 on GNU/Linux) might return `size' in that |
| 633 | case. */ |
| 634 | while ((len = strftime (tbuf, size, myfmt, &t)) == 0 || len == size) |
| 635 | { |
| 636 | scm_must_free (tbuf); |
| 637 | size *= 2; |
| 638 | tbuf = SCM_MUST_MALLOC (size); |
| 639 | } |
| 640 | |
| 641 | #if !defined (HAVE_TM_ZONE) |
| 642 | if (have_zone) |
| 643 | { |
| 644 | restorezone (velts[10], oldenv, FUNC_NAME); |
| 645 | SCM_ALLOW_INTS; |
| 646 | } |
| 647 | #endif |
| 648 | } |
| 649 | |
| 650 | result = scm_mem2string (tbuf + 1, len - 1); |
| 651 | scm_must_free (tbuf); |
| 652 | scm_must_free(myfmt); |
| 653 | return result; |
| 654 | } |
| 655 | #undef FUNC_NAME |
| 656 | |
| 657 | #ifdef HAVE_STRPTIME |
| 658 | SCM_DEFINE (scm_strptime, "strptime", 2, 0, 0, |
| 659 | (SCM format, SCM string), |
| 660 | "Performs the reverse action to @code{strftime}, parsing\n" |
| 661 | "@var{string} according to the specification supplied in\n" |
| 662 | "@var{template}. The interpretation of month and day names is\n" |
| 663 | "dependent on the current locale. The value returned is a pair.\n" |
| 664 | "The car has an object with time components\n" |
| 665 | "in the form returned by @code{localtime} or @code{gmtime},\n" |
| 666 | "but the time zone components\n" |
| 667 | "are not usefully set.\n" |
| 668 | "The cdr reports the number of characters from @var{string}\n" |
| 669 | "which were used for the conversion.") |
| 670 | #define FUNC_NAME s_scm_strptime |
| 671 | { |
| 672 | struct tm t; |
| 673 | char *fmt, *str, *rest; |
| 674 | |
| 675 | SCM_VALIDATE_STRING (1, format); |
| 676 | SCM_VALIDATE_STRING (2, string); |
| 677 | |
| 678 | SCM_STRING_COERCE_0TERMINATION_X (format); |
| 679 | SCM_STRING_COERCE_0TERMINATION_X (string); |
| 680 | fmt = SCM_STRING_CHARS (format); |
| 681 | str = SCM_STRING_CHARS (string); |
| 682 | |
| 683 | /* initialize the struct tm */ |
| 684 | #define tm_init(field) t.field = 0 |
| 685 | tm_init (tm_sec); |
| 686 | tm_init (tm_min); |
| 687 | tm_init (tm_hour); |
| 688 | tm_init (tm_mday); |
| 689 | tm_init (tm_mon); |
| 690 | tm_init (tm_year); |
| 691 | tm_init (tm_wday); |
| 692 | tm_init (tm_yday); |
| 693 | #undef tm_init |
| 694 | |
| 695 | t.tm_isdst = -1; |
| 696 | SCM_DEFER_INTS; |
| 697 | if ((rest = strptime (str, fmt, &t)) == NULL) |
| 698 | SCM_SYSERROR; |
| 699 | |
| 700 | SCM_ALLOW_INTS; |
| 701 | return scm_cons (filltime (&t, 0, NULL), SCM_MAKINUM (rest - str)); |
| 702 | } |
| 703 | #undef FUNC_NAME |
| 704 | #endif /* HAVE_STRPTIME */ |
| 705 | |
| 706 | void |
| 707 | scm_init_stime() |
| 708 | { |
| 709 | scm_c_define ("internal-time-units-per-second", |
| 710 | scm_long2num((long)CLKTCK)); |
| 711 | |
| 712 | #ifdef HAVE_FTIME |
| 713 | if (!scm_your_base.time) ftime(&scm_your_base); |
| 714 | #else |
| 715 | if (!scm_your_base) time(&scm_your_base); |
| 716 | #endif |
| 717 | |
| 718 | if (!scm_my_base) scm_my_base = mytime(); |
| 719 | |
| 720 | scm_add_feature ("current-time"); |
| 721 | #ifndef SCM_MAGIC_SNARFER |
| 722 | #include "libguile/stime.x" |
| 723 | #endif |
| 724 | } |
| 725 | |
| 726 | |
| 727 | /* |
| 728 | Local Variables: |
| 729 | c-file-style: "gnu" |
| 730 | End: |
| 731 | */ |