| 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public License |
| 5 | * as published by the Free Software Foundation; either version 3 of |
| 6 | * the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | \f |
| 21 | |
| 22 | /* _POSIX_C_SOURCE is not defined always, because it causes problems on some |
| 23 | systems, notably |
| 24 | |
| 25 | - FreeBSD loses all BSD and XOPEN defines. |
| 26 | - glibc loses some things like CLK_TCK. |
| 27 | - On MINGW it conflicts with the pthread headers. |
| 28 | |
| 29 | But on HP-UX _POSIX_C_SOURCE is needed, as noted, for gmtime_r. |
| 30 | |
| 31 | Perhaps a configure test could figure out what _POSIX_C_SOURCE gives and |
| 32 | what it takes away, and decide from that whether to use it, instead of |
| 33 | hard coding __hpux. */ |
| 34 | |
| 35 | #ifndef _REENTRANT |
| 36 | # define _REENTRANT /* ask solaris for gmtime_r prototype */ |
| 37 | #endif |
| 38 | #ifdef __hpux |
| 39 | #define _POSIX_C_SOURCE 199506L /* for gmtime_r prototype */ |
| 40 | #endif |
| 41 | |
| 42 | #ifdef HAVE_CONFIG_H |
| 43 | # include <config.h> |
| 44 | #endif |
| 45 | |
| 46 | #include <stdio.h> |
| 47 | #include <errno.h> |
| 48 | #include <strftime.h> |
| 49 | #include <unistr.h> |
| 50 | |
| 51 | #include "libguile/_scm.h" |
| 52 | #include "libguile/async.h" |
| 53 | #include "libguile/feature.h" |
| 54 | #include "libguile/strings.h" |
| 55 | #include "libguile/vectors.h" |
| 56 | #include "libguile/dynwind.h" |
| 57 | #include "libguile/strings.h" |
| 58 | |
| 59 | #include "libguile/validate.h" |
| 60 | #include "libguile/stime.h" |
| 61 | |
| 62 | #ifdef HAVE_UNISTD_H |
| 63 | #include <unistd.h> |
| 64 | #endif |
| 65 | |
| 66 | \f |
| 67 | # ifdef HAVE_SYS_TYPES_H |
| 68 | # include <sys/types.h> |
| 69 | # endif |
| 70 | |
| 71 | #ifdef HAVE_STRING_H |
| 72 | #include <string.h> |
| 73 | #endif |
| 74 | |
| 75 | #ifdef HAVE_SYS_TIMES_H |
| 76 | # include <sys/times.h> |
| 77 | #endif |
| 78 | |
| 79 | #ifdef HAVE_SYS_TIMEB_H |
| 80 | # include <sys/timeb.h> |
| 81 | #endif |
| 82 | |
| 83 | #ifndef tzname /* For SGI. */ |
| 84 | extern char *tzname[]; /* RS6000 and others reject char **tzname. */ |
| 85 | #endif |
| 86 | #if defined (__MINGW32__) |
| 87 | # define tzname _tzname |
| 88 | #endif |
| 89 | |
| 90 | #if ! HAVE_DECL_STRPTIME |
| 91 | extern char *strptime (); |
| 92 | #endif |
| 93 | |
| 94 | #ifdef __STDC__ |
| 95 | # define timet time_t |
| 96 | #else |
| 97 | # define timet long |
| 98 | #endif |
| 99 | |
| 100 | |
| 101 | #ifdef HAVE_TIMES |
| 102 | static |
| 103 | timet mytime() |
| 104 | { |
| 105 | struct tms time_buffer; |
| 106 | times(&time_buffer); |
| 107 | return time_buffer.tms_utime + time_buffer.tms_stime; |
| 108 | } |
| 109 | #else |
| 110 | # ifdef LACK_CLOCK |
| 111 | # define mytime() ((time((timet*)0) - scm_your_base) * SCM_TIME_UNITS_PER_SECOND) |
| 112 | # else |
| 113 | # define mytime clock |
| 114 | # endif |
| 115 | #endif |
| 116 | |
| 117 | #ifdef HAVE_FTIME |
| 118 | struct timeb scm_your_base = {0}; |
| 119 | #else |
| 120 | timet scm_your_base = 0; |
| 121 | #endif |
| 122 | |
| 123 | SCM_DEFINE (scm_get_internal_real_time, "get-internal-real-time", 0, 0, 0, |
| 124 | (), |
| 125 | "Return the number of time units since the interpreter was\n" |
| 126 | "started.") |
| 127 | #define FUNC_NAME s_scm_get_internal_real_time |
| 128 | { |
| 129 | #ifdef HAVE_FTIME |
| 130 | struct timeb time_buffer; |
| 131 | |
| 132 | SCM tmp; |
| 133 | ftime (&time_buffer); |
| 134 | time_buffer.time -= scm_your_base.time; |
| 135 | tmp = scm_from_long (time_buffer.millitm - scm_your_base.millitm); |
| 136 | tmp = scm_sum (tmp, |
| 137 | scm_product (scm_from_int (1000), |
| 138 | scm_from_int (time_buffer.time))); |
| 139 | return scm_quotient (scm_product (tmp, |
| 140 | scm_from_int (SCM_TIME_UNITS_PER_SECOND)), |
| 141 | scm_from_int (1000)); |
| 142 | #else |
| 143 | return scm_from_long ((time((timet*)0) - scm_your_base) |
| 144 | * (int)SCM_TIME_UNITS_PER_SECOND); |
| 145 | #endif /* HAVE_FTIME */ |
| 146 | } |
| 147 | #undef FUNC_NAME |
| 148 | |
| 149 | |
| 150 | #ifdef HAVE_TIMES |
| 151 | SCM_DEFINE (scm_times, "times", 0, 0, 0, |
| 152 | (void), |
| 153 | "Return an object with information about real and processor\n" |
| 154 | "time. The following procedures accept such an object as an\n" |
| 155 | "argument and return a selected component:\n" |
| 156 | "\n" |
| 157 | "@table @code\n" |
| 158 | "@item tms:clock\n" |
| 159 | "The current real time, expressed as time units relative to an\n" |
| 160 | "arbitrary base.\n" |
| 161 | "@item tms:utime\n" |
| 162 | "The CPU time units used by the calling process.\n" |
| 163 | "@item tms:stime\n" |
| 164 | "The CPU time units used by the system on behalf of the calling\n" |
| 165 | "process.\n" |
| 166 | "@item tms:cutime\n" |
| 167 | "The CPU time units used by terminated child processes of the\n" |
| 168 | "calling process, whose status has been collected (e.g., using\n" |
| 169 | "@code{waitpid}).\n" |
| 170 | "@item tms:cstime\n" |
| 171 | "Similarly, the CPU times units used by the system on behalf of\n" |
| 172 | "terminated child processes.\n" |
| 173 | "@end table") |
| 174 | #define FUNC_NAME s_scm_times |
| 175 | { |
| 176 | struct tms t; |
| 177 | clock_t rv; |
| 178 | |
| 179 | SCM result = scm_c_make_vector (5, SCM_UNDEFINED); |
| 180 | rv = times (&t); |
| 181 | if (rv == -1) |
| 182 | SCM_SYSERROR; |
| 183 | SCM_SIMPLE_VECTOR_SET (result, 0, scm_from_long (rv)); |
| 184 | SCM_SIMPLE_VECTOR_SET (result, 1, scm_from_long (t.tms_utime)); |
| 185 | SCM_SIMPLE_VECTOR_SET (result, 2, scm_from_long (t.tms_stime)); |
| 186 | SCM_SIMPLE_VECTOR_SET (result ,3, scm_from_long (t.tms_cutime)); |
| 187 | SCM_SIMPLE_VECTOR_SET (result, 4, scm_from_long (t.tms_cstime)); |
| 188 | return result; |
| 189 | } |
| 190 | #undef FUNC_NAME |
| 191 | #endif /* HAVE_TIMES */ |
| 192 | |
| 193 | static long scm_my_base = 0; |
| 194 | |
| 195 | long |
| 196 | scm_c_get_internal_run_time () |
| 197 | { |
| 198 | return mytime () - scm_my_base; |
| 199 | } |
| 200 | |
| 201 | SCM_DEFINE (scm_get_internal_run_time, "get-internal-run-time", 0, 0, 0, |
| 202 | (void), |
| 203 | "Return the number of time units of processor time used by the\n" |
| 204 | "interpreter. Both @emph{system} and @emph{user} time are\n" |
| 205 | "included but subprocesses are not.") |
| 206 | #define FUNC_NAME s_scm_get_internal_run_time |
| 207 | { |
| 208 | return scm_from_long (scm_c_get_internal_run_time ()); |
| 209 | } |
| 210 | #undef FUNC_NAME |
| 211 | |
| 212 | /* For reference, note that current-time and gettimeofday both should be |
| 213 | protected against setzone/restorezone changes in another thread, since on |
| 214 | DOS the system time is normally kept as local time, which means TZ |
| 215 | affects the return from current-time and gettimeofday. Not sure if DJGPP |
| 216 | etc actually has concurrent multi-threading, but it seems prudent not to |
| 217 | make assumptions about this. */ |
| 218 | |
| 219 | SCM_DEFINE (scm_current_time, "current-time", 0, 0, 0, |
| 220 | (void), |
| 221 | "Return the number of seconds since 1970-01-01 00:00:00 UTC,\n" |
| 222 | "excluding leap seconds.") |
| 223 | #define FUNC_NAME s_scm_current_time |
| 224 | { |
| 225 | timet timv; |
| 226 | |
| 227 | SCM_CRITICAL_SECTION_START; |
| 228 | timv = time (NULL); |
| 229 | SCM_CRITICAL_SECTION_END; |
| 230 | if (timv == -1) |
| 231 | SCM_MISC_ERROR ("current time not available", SCM_EOL); |
| 232 | return scm_from_long (timv); |
| 233 | } |
| 234 | #undef FUNC_NAME |
| 235 | |
| 236 | SCM_DEFINE (scm_gettimeofday, "gettimeofday", 0, 0, 0, |
| 237 | (void), |
| 238 | "Return a pair containing the number of seconds and microseconds\n" |
| 239 | "since 1970-01-01 00:00:00 UTC, excluding leap seconds. Note:\n" |
| 240 | "whether true microsecond resolution is available depends on the\n" |
| 241 | "operating system.") |
| 242 | #define FUNC_NAME s_scm_gettimeofday |
| 243 | { |
| 244 | #ifdef HAVE_GETTIMEOFDAY |
| 245 | struct timeval time; |
| 246 | int ret, err; |
| 247 | |
| 248 | SCM_CRITICAL_SECTION_START; |
| 249 | ret = gettimeofday (&time, NULL); |
| 250 | err = errno; |
| 251 | SCM_CRITICAL_SECTION_END; |
| 252 | if (ret == -1) |
| 253 | { |
| 254 | errno = err; |
| 255 | SCM_SYSERROR; |
| 256 | } |
| 257 | return scm_cons (scm_from_long (time.tv_sec), |
| 258 | scm_from_long (time.tv_usec)); |
| 259 | #else |
| 260 | # ifdef HAVE_FTIME |
| 261 | struct timeb time; |
| 262 | |
| 263 | ftime(&time); |
| 264 | return scm_cons (scm_from_long (time.time), |
| 265 | scm_from_int (time.millitm * 1000)); |
| 266 | # else |
| 267 | timet timv; |
| 268 | int err; |
| 269 | |
| 270 | SCM_CRITICAL_SECTION_START; |
| 271 | timv = time (NULL); |
| 272 | err = errno; |
| 273 | SCM_CRITICAL_SECTION_END; |
| 274 | if (timv == -1) |
| 275 | { |
| 276 | errno = err; |
| 277 | SCM_SYSERROR; |
| 278 | } |
| 279 | return scm_cons (scm_from_long (timv), scm_from_int (0)); |
| 280 | # endif |
| 281 | #endif |
| 282 | } |
| 283 | #undef FUNC_NAME |
| 284 | |
| 285 | static SCM |
| 286 | filltime (struct tm *bd_time, int zoff, const char *zname) |
| 287 | { |
| 288 | SCM result = scm_c_make_vector (11, SCM_UNDEFINED); |
| 289 | |
| 290 | SCM_SIMPLE_VECTOR_SET (result,0, scm_from_int (bd_time->tm_sec)); |
| 291 | SCM_SIMPLE_VECTOR_SET (result,1, scm_from_int (bd_time->tm_min)); |
| 292 | SCM_SIMPLE_VECTOR_SET (result,2, scm_from_int (bd_time->tm_hour)); |
| 293 | SCM_SIMPLE_VECTOR_SET (result,3, scm_from_int (bd_time->tm_mday)); |
| 294 | SCM_SIMPLE_VECTOR_SET (result,4, scm_from_int (bd_time->tm_mon)); |
| 295 | SCM_SIMPLE_VECTOR_SET (result,5, scm_from_int (bd_time->tm_year)); |
| 296 | SCM_SIMPLE_VECTOR_SET (result,6, scm_from_int (bd_time->tm_wday)); |
| 297 | SCM_SIMPLE_VECTOR_SET (result,7, scm_from_int (bd_time->tm_yday)); |
| 298 | SCM_SIMPLE_VECTOR_SET (result,8, scm_from_int (bd_time->tm_isdst)); |
| 299 | SCM_SIMPLE_VECTOR_SET (result,9, scm_from_int (zoff)); |
| 300 | SCM_SIMPLE_VECTOR_SET (result,10, (zname |
| 301 | ? scm_from_locale_string (zname) |
| 302 | : SCM_BOOL_F)); |
| 303 | return result; |
| 304 | } |
| 305 | |
| 306 | static char tzvar[3] = "TZ"; |
| 307 | |
| 308 | /* if zone is set, create a temporary environment with only a TZ |
| 309 | string. other threads or interrupt handlers shouldn't be allowed |
| 310 | to run until the corresponding restorezone is called. hence the use |
| 311 | of a static variable for tmpenv is no big deal. */ |
| 312 | static char ** |
| 313 | setzone (SCM zone, int pos, const char *subr) |
| 314 | { |
| 315 | char **oldenv = 0; |
| 316 | |
| 317 | if (!SCM_UNBNDP (zone)) |
| 318 | { |
| 319 | static char *tmpenv[2]; |
| 320 | char *buf; |
| 321 | size_t zone_len; |
| 322 | |
| 323 | zone_len = scm_to_locale_stringbuf (zone, NULL, 0); |
| 324 | buf = scm_malloc (zone_len + sizeof (tzvar) + 1); |
| 325 | strcpy (buf, tzvar); |
| 326 | buf[sizeof(tzvar)-1] = '='; |
| 327 | scm_to_locale_stringbuf (zone, buf+sizeof(tzvar), zone_len); |
| 328 | buf[sizeof(tzvar)+zone_len] = '\0'; |
| 329 | oldenv = environ; |
| 330 | tmpenv[0] = buf; |
| 331 | tmpenv[1] = 0; |
| 332 | environ = tmpenv; |
| 333 | } |
| 334 | return oldenv; |
| 335 | } |
| 336 | |
| 337 | static void |
| 338 | restorezone (SCM zone, char **oldenv, const char *subr SCM_UNUSED) |
| 339 | { |
| 340 | if (!SCM_UNBNDP (zone)) |
| 341 | { |
| 342 | free (environ[0]); |
| 343 | environ = oldenv; |
| 344 | #ifdef HAVE_TZSET |
| 345 | /* for the possible benefit of user code linked with libguile. */ |
| 346 | tzset(); |
| 347 | #endif |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | SCM_DEFINE (scm_localtime, "localtime", 1, 1, 0, |
| 352 | (SCM time, SCM zone), |
| 353 | "Return an object representing the broken down components of\n" |
| 354 | "@var{time}, an integer like the one returned by\n" |
| 355 | "@code{current-time}. The time zone for the calculation is\n" |
| 356 | "optionally specified by @var{zone} (a string), otherwise the\n" |
| 357 | "@code{TZ} environment variable or the system default is used.") |
| 358 | #define FUNC_NAME s_scm_localtime |
| 359 | { |
| 360 | timet itime; |
| 361 | struct tm *ltptr, lt, *utc; |
| 362 | SCM result; |
| 363 | int zoff; |
| 364 | char *zname = 0; |
| 365 | char **oldenv; |
| 366 | int err; |
| 367 | |
| 368 | itime = SCM_NUM2LONG (1, time); |
| 369 | |
| 370 | /* deferring interupts is essential since a) setzone may install a temporary |
| 371 | environment b) localtime uses a static buffer. */ |
| 372 | SCM_CRITICAL_SECTION_START; |
| 373 | oldenv = setzone (zone, SCM_ARG2, FUNC_NAME); |
| 374 | #ifdef LOCALTIME_CACHE |
| 375 | tzset (); |
| 376 | #endif |
| 377 | /* POSIX says localtime sets errno, but C99 doesn't say that. |
| 378 | Give a sensible default value in case localtime doesn't set it. */ |
| 379 | errno = EINVAL; |
| 380 | ltptr = localtime (&itime); |
| 381 | err = errno; |
| 382 | if (ltptr) |
| 383 | { |
| 384 | const char *ptr; |
| 385 | |
| 386 | /* copy zone name before calling gmtime or restoring zone. */ |
| 387 | #if defined (HAVE_TM_ZONE) |
| 388 | ptr = ltptr->tm_zone; |
| 389 | #elif defined (HAVE_TZNAME) |
| 390 | ptr = tzname[ (ltptr->tm_isdst == 1) ? 1 : 0 ]; |
| 391 | #else |
| 392 | ptr = ""; |
| 393 | #endif |
| 394 | zname = scm_malloc (strlen (ptr) + 1); |
| 395 | strcpy (zname, ptr); |
| 396 | } |
| 397 | /* the struct is copied in case localtime and gmtime share a buffer. */ |
| 398 | if (ltptr) |
| 399 | lt = *ltptr; |
| 400 | /* POSIX says gmtime sets errno, but C99 doesn't say that. |
| 401 | Give a sensible default value in case gmtime doesn't set it. */ |
| 402 | errno = EINVAL; |
| 403 | utc = gmtime (&itime); |
| 404 | if (utc == NULL) |
| 405 | err = errno; |
| 406 | restorezone (zone, oldenv, FUNC_NAME); |
| 407 | /* delayed until zone has been restored. */ |
| 408 | errno = err; |
| 409 | if (utc == NULL || ltptr == NULL) |
| 410 | SCM_SYSERROR; |
| 411 | |
| 412 | /* calculate timezone offset in seconds west of UTC. */ |
| 413 | zoff = (utc->tm_hour - lt.tm_hour) * 3600 + (utc->tm_min - lt.tm_min) * 60 |
| 414 | + utc->tm_sec - lt.tm_sec; |
| 415 | if (utc->tm_year < lt.tm_year) |
| 416 | zoff -= 24 * 60 * 60; |
| 417 | else if (utc->tm_year > lt.tm_year) |
| 418 | zoff += 24 * 60 * 60; |
| 419 | else if (utc->tm_yday < lt.tm_yday) |
| 420 | zoff -= 24 * 60 * 60; |
| 421 | else if (utc->tm_yday > lt.tm_yday) |
| 422 | zoff += 24 * 60 * 60; |
| 423 | |
| 424 | result = filltime (<, zoff, zname); |
| 425 | SCM_CRITICAL_SECTION_END; |
| 426 | |
| 427 | free (zname); |
| 428 | return result; |
| 429 | } |
| 430 | #undef FUNC_NAME |
| 431 | |
| 432 | /* tm_zone is normally a pointer, not an array within struct tm, so we might |
| 433 | have to worry about the lifespan of what it points to. The posix specs |
| 434 | don't seem to say anything about this, let's assume here that tm_zone |
| 435 | will be a constant and therefore no protection or anything is needed |
| 436 | until we copy it in filltime(). */ |
| 437 | |
| 438 | SCM_DEFINE (scm_gmtime, "gmtime", 1, 0, 0, |
| 439 | (SCM time), |
| 440 | "Return an object representing the broken down components of\n" |
| 441 | "@var{time}, an integer like the one returned by\n" |
| 442 | "@code{current-time}. The values are calculated for UTC.") |
| 443 | #define FUNC_NAME s_scm_gmtime |
| 444 | { |
| 445 | timet itime; |
| 446 | struct tm bd_buf, *bd_time; |
| 447 | const char *zname; |
| 448 | |
| 449 | itime = SCM_NUM2LONG (1, time); |
| 450 | |
| 451 | /* POSIX says gmtime sets errno, but C99 doesn't say that. |
| 452 | Give a sensible default value in case gmtime doesn't set it. */ |
| 453 | errno = EINVAL; |
| 454 | |
| 455 | #if HAVE_GMTIME_R |
| 456 | bd_time = gmtime_r (&itime, &bd_buf); |
| 457 | #else |
| 458 | SCM_CRITICAL_SECTION_START; |
| 459 | bd_time = gmtime (&itime); |
| 460 | if (bd_time != NULL) |
| 461 | bd_buf = *bd_time; |
| 462 | SCM_CRITICAL_SECTION_END; |
| 463 | #endif |
| 464 | if (bd_time == NULL) |
| 465 | SCM_SYSERROR; |
| 466 | |
| 467 | #if HAVE_STRUCT_TM_TM_ZONE |
| 468 | zname = bd_buf.tm_zone; |
| 469 | #else |
| 470 | zname = "GMT"; |
| 471 | #endif |
| 472 | return filltime (&bd_buf, 0, zname); |
| 473 | } |
| 474 | #undef FUNC_NAME |
| 475 | |
| 476 | /* copy time components from a Scheme object to a struct tm. */ |
| 477 | static void |
| 478 | bdtime2c (SCM sbd_time, struct tm *lt, int pos, const char *subr) |
| 479 | { |
| 480 | SCM_ASSERT (scm_is_simple_vector (sbd_time) |
| 481 | && SCM_SIMPLE_VECTOR_LENGTH (sbd_time) == 11, |
| 482 | sbd_time, pos, subr); |
| 483 | |
| 484 | lt->tm_sec = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 0)); |
| 485 | lt->tm_min = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 1)); |
| 486 | lt->tm_hour = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 2)); |
| 487 | lt->tm_mday = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 3)); |
| 488 | lt->tm_mon = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 4)); |
| 489 | lt->tm_year = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 5)); |
| 490 | lt->tm_wday = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 6)); |
| 491 | lt->tm_yday = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 7)); |
| 492 | lt->tm_isdst = scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 8)); |
| 493 | #if HAVE_STRUCT_TM_TM_GMTOFF |
| 494 | lt->tm_gmtoff = - scm_to_int (SCM_SIMPLE_VECTOR_REF (sbd_time, 9)); |
| 495 | #endif |
| 496 | #ifdef HAVE_TM_ZONE |
| 497 | if (scm_is_false (SCM_SIMPLE_VECTOR_REF (sbd_time, 10))) |
| 498 | lt->tm_zone = NULL; |
| 499 | else |
| 500 | lt->tm_zone = scm_to_locale_string (SCM_SIMPLE_VECTOR_REF (sbd_time, 10)); |
| 501 | #endif |
| 502 | } |
| 503 | |
| 504 | SCM_DEFINE (scm_mktime, "mktime", 1, 1, 0, |
| 505 | (SCM sbd_time, SCM zone), |
| 506 | "@var{bd-time} is an object representing broken down time and @code{zone}\n" |
| 507 | "is an optional time zone specifier (otherwise the TZ environment variable\n" |
| 508 | "or the system default is used).\n\n" |
| 509 | "Returns a pair: the car is a corresponding\n" |
| 510 | "integer time value like that returned\n" |
| 511 | "by @code{current-time}; the cdr is a broken down time object, similar to\n" |
| 512 | "as @var{bd-time} but with normalized values.") |
| 513 | #define FUNC_NAME s_scm_mktime |
| 514 | { |
| 515 | timet itime; |
| 516 | struct tm lt, *utc; |
| 517 | SCM result; |
| 518 | int zoff; |
| 519 | char *zname = 0; |
| 520 | char **oldenv; |
| 521 | int err; |
| 522 | |
| 523 | scm_dynwind_begin (0); |
| 524 | |
| 525 | bdtime2c (sbd_time, <, SCM_ARG1, FUNC_NAME); |
| 526 | #if HAVE_STRUCT_TM_TM_ZONE |
| 527 | scm_dynwind_free ((char *)lt.tm_zone); |
| 528 | #endif |
| 529 | |
| 530 | scm_dynwind_critical_section (SCM_BOOL_F); |
| 531 | |
| 532 | oldenv = setzone (zone, SCM_ARG2, FUNC_NAME); |
| 533 | #ifdef LOCALTIME_CACHE |
| 534 | tzset (); |
| 535 | #endif |
| 536 | itime = mktime (<); |
| 537 | /* POSIX doesn't say mktime sets errno, and on glibc 2.3.2 for instance it |
| 538 | doesn't. Force a sensible value for our error message. */ |
| 539 | err = EINVAL; |
| 540 | |
| 541 | if (itime != -1) |
| 542 | { |
| 543 | const char *ptr; |
| 544 | |
| 545 | /* copy zone name before calling gmtime or restoring the zone. */ |
| 546 | #if defined (HAVE_TM_ZONE) |
| 547 | ptr = lt.tm_zone; |
| 548 | #elif defined (HAVE_TZNAME) |
| 549 | ptr = tzname[ (lt.tm_isdst == 1) ? 1 : 0 ]; |
| 550 | #else |
| 551 | ptr = ""; |
| 552 | #endif |
| 553 | zname = scm_malloc (strlen (ptr) + 1); |
| 554 | strcpy (zname, ptr); |
| 555 | } |
| 556 | |
| 557 | /* get timezone offset in seconds west of UTC. */ |
| 558 | /* POSIX says gmtime sets errno, but C99 doesn't say that. |
| 559 | Give a sensible default value in case gmtime doesn't set it. */ |
| 560 | errno = EINVAL; |
| 561 | utc = gmtime (&itime); |
| 562 | if (utc == NULL) |
| 563 | err = errno; |
| 564 | |
| 565 | restorezone (zone, oldenv, FUNC_NAME); |
| 566 | /* delayed until zone has been restored. */ |
| 567 | errno = err; |
| 568 | if (utc == NULL || itime == -1) |
| 569 | SCM_SYSERROR; |
| 570 | |
| 571 | zoff = (utc->tm_hour - lt.tm_hour) * 3600 + (utc->tm_min - lt.tm_min) * 60 |
| 572 | + utc->tm_sec - lt.tm_sec; |
| 573 | if (utc->tm_year < lt.tm_year) |
| 574 | zoff -= 24 * 60 * 60; |
| 575 | else if (utc->tm_year > lt.tm_year) |
| 576 | zoff += 24 * 60 * 60; |
| 577 | else if (utc->tm_yday < lt.tm_yday) |
| 578 | zoff -= 24 * 60 * 60; |
| 579 | else if (utc->tm_yday > lt.tm_yday) |
| 580 | zoff += 24 * 60 * 60; |
| 581 | |
| 582 | result = scm_cons (scm_from_long (itime), |
| 583 | filltime (<, zoff, zname)); |
| 584 | free (zname); |
| 585 | |
| 586 | scm_dynwind_end (); |
| 587 | return result; |
| 588 | } |
| 589 | #undef FUNC_NAME |
| 590 | |
| 591 | #ifdef HAVE_TZSET |
| 592 | SCM_DEFINE (scm_tzset, "tzset", 0, 0, 0, |
| 593 | (void), |
| 594 | "Initialize the timezone from the TZ environment variable\n" |
| 595 | "or the system default. It's not usually necessary to call this procedure\n" |
| 596 | "since it's done automatically by other procedures that depend on the\n" |
| 597 | "timezone.") |
| 598 | #define FUNC_NAME s_scm_tzset |
| 599 | { |
| 600 | tzset(); |
| 601 | return SCM_UNSPECIFIED; |
| 602 | } |
| 603 | #undef FUNC_NAME |
| 604 | #endif /* HAVE_TZSET */ |
| 605 | |
| 606 | SCM_DEFINE (scm_strftime, "strftime", 2, 0, 0, |
| 607 | (SCM format, SCM stime), |
| 608 | "Return a string which is broken-down time structure @var{stime}\n" |
| 609 | "formatted according to the given @var{format} string.\n" |
| 610 | "\n" |
| 611 | "@var{format} contains field specifications introduced by a\n" |
| 612 | "@samp{%} character. See @ref{Formatting Calendar Time,,, libc,\n" |
| 613 | "The GNU C Library Reference Manual}, or @samp{man 3 strftime},\n" |
| 614 | "for the available formatting.\n" |
| 615 | "\n" |
| 616 | "@lisp\n" |
| 617 | "(strftime \"%c\" (localtime (current-time)))\n" |
| 618 | "@result{} \"Mon Mar 11 20:17:43 2002\"\n" |
| 619 | "@end lisp\n" |
| 620 | "\n" |
| 621 | "If @code{setlocale} has been called (@pxref{Locales}), month\n" |
| 622 | "and day names are from the current locale and in the locale\n" |
| 623 | "character set.") |
| 624 | #define FUNC_NAME s_scm_strftime |
| 625 | { |
| 626 | struct tm t; |
| 627 | |
| 628 | char *tbuf; |
| 629 | int size = 50; |
| 630 | char *fmt; |
| 631 | char *myfmt; |
| 632 | size_t len; |
| 633 | SCM result; |
| 634 | |
| 635 | SCM_VALIDATE_STRING (1, format); |
| 636 | bdtime2c (stime, &t, SCM_ARG2, FUNC_NAME); |
| 637 | |
| 638 | /* Convert string to UTF-8 so that non-ASCII characters in the |
| 639 | format are passed through unchanged. */ |
| 640 | fmt = scm_to_utf8_stringn (format, &len); |
| 641 | |
| 642 | /* Ugly hack: strftime can return 0 if its buffer is too small, |
| 643 | but some valid time strings (e.g. "%p") can sometimes produce |
| 644 | a zero-byte output string! Workaround is to prepend a junk |
| 645 | character to the format string, so that valid returns are always |
| 646 | nonzero. */ |
| 647 | myfmt = scm_malloc (len+2); |
| 648 | *myfmt = (scm_t_uint8) 'x'; |
| 649 | strncpy (myfmt + 1, fmt, len); |
| 650 | myfmt[len + 1] = 0; |
| 651 | scm_remember_upto_here_1 (format); |
| 652 | free (fmt); |
| 653 | |
| 654 | tbuf = scm_malloc (size); |
| 655 | { |
| 656 | #if !defined (HAVE_TM_ZONE) |
| 657 | /* it seems the only way to tell non-GNU versions of strftime what |
| 658 | zone to use (for the %Z format) is to set TZ in the |
| 659 | environment. interrupts and thread switching must be deferred |
| 660 | until TZ is restored. */ |
| 661 | char **oldenv = NULL; |
| 662 | SCM zone_spec = SCM_SIMPLE_VECTOR_REF (stime, 10); |
| 663 | int have_zone = 0; |
| 664 | |
| 665 | if (scm_is_true (zone_spec) && scm_c_string_length (zone_spec) > 0) |
| 666 | { |
| 667 | /* it's not required that the TZ setting be correct, just that |
| 668 | it has the right name. so try something like TZ=EST0. |
| 669 | using only TZ=EST would be simpler but it doesn't work on |
| 670 | some OSs, e.g., Solaris. */ |
| 671 | SCM zone = |
| 672 | scm_string_append (scm_list_2 (zone_spec, |
| 673 | scm_from_locale_string ("0"))); |
| 674 | |
| 675 | have_zone = 1; |
| 676 | SCM_CRITICAL_SECTION_START; |
| 677 | oldenv = setzone (zone, SCM_ARG2, FUNC_NAME); |
| 678 | } |
| 679 | #endif |
| 680 | |
| 681 | #ifdef LOCALTIME_CACHE |
| 682 | tzset (); |
| 683 | #endif |
| 684 | |
| 685 | /* Use `nstrftime ()' from Gnulib, which supports all GNU extensions |
| 686 | supported by glibc. */ |
| 687 | while ((len = nstrftime (tbuf, size, myfmt, &t, 0, 0)) == 0) |
| 688 | { |
| 689 | free (tbuf); |
| 690 | size *= 2; |
| 691 | tbuf = scm_malloc (size); |
| 692 | } |
| 693 | |
| 694 | #if !defined (HAVE_TM_ZONE) |
| 695 | if (have_zone) |
| 696 | { |
| 697 | restorezone (zone_spec, oldenv, FUNC_NAME); |
| 698 | SCM_CRITICAL_SECTION_END; |
| 699 | } |
| 700 | #endif |
| 701 | } |
| 702 | |
| 703 | result = scm_from_utf8_string (tbuf + 1); |
| 704 | free (tbuf); |
| 705 | free (myfmt); |
| 706 | #if HAVE_STRUCT_TM_TM_ZONE |
| 707 | free ((char *) t.tm_zone); |
| 708 | #endif |
| 709 | return result; |
| 710 | } |
| 711 | #undef FUNC_NAME |
| 712 | |
| 713 | #ifdef HAVE_STRPTIME |
| 714 | SCM_DEFINE (scm_strptime, "strptime", 2, 0, 0, |
| 715 | (SCM format, SCM string), |
| 716 | "Performs the reverse action to @code{strftime}, parsing\n" |
| 717 | "@var{string} according to the specification supplied in\n" |
| 718 | "@var{template}. The interpretation of month and day names is\n" |
| 719 | "dependent on the current locale. The value returned is a pair.\n" |
| 720 | "The car has an object with time components\n" |
| 721 | "in the form returned by @code{localtime} or @code{gmtime},\n" |
| 722 | "but the time zone components\n" |
| 723 | "are not usefully set.\n" |
| 724 | "The cdr reports the number of characters from @var{string}\n" |
| 725 | "which were used for the conversion.") |
| 726 | #define FUNC_NAME s_scm_strptime |
| 727 | { |
| 728 | struct tm t; |
| 729 | char *fmt, *str, *rest; |
| 730 | size_t used_len; |
| 731 | long zoff; |
| 732 | |
| 733 | SCM_VALIDATE_STRING (1, format); |
| 734 | SCM_VALIDATE_STRING (2, string); |
| 735 | |
| 736 | /* Convert strings to UTF-8 so that non-ASCII characters are passed |
| 737 | through unchanged. */ |
| 738 | fmt = scm_to_utf8_string (format); |
| 739 | str = scm_to_utf8_string (string); |
| 740 | |
| 741 | /* initialize the struct tm */ |
| 742 | #define tm_init(field) t.field = 0 |
| 743 | tm_init (tm_sec); |
| 744 | tm_init (tm_min); |
| 745 | tm_init (tm_hour); |
| 746 | tm_init (tm_mday); |
| 747 | tm_init (tm_mon); |
| 748 | tm_init (tm_year); |
| 749 | tm_init (tm_wday); |
| 750 | tm_init (tm_yday); |
| 751 | #if HAVE_STRUCT_TM_TM_GMTOFF |
| 752 | tm_init (tm_gmtoff); |
| 753 | #endif |
| 754 | #undef tm_init |
| 755 | |
| 756 | /* GNU glibc strptime() "%s" is affected by the current timezone, since it |
| 757 | reads a UTC time_t value and converts with localtime_r() to set the tm |
| 758 | fields, hence the use of SCM_CRITICAL_SECTION_START. */ |
| 759 | t.tm_isdst = -1; |
| 760 | SCM_CRITICAL_SECTION_START; |
| 761 | rest = strptime (str, fmt, &t); |
| 762 | SCM_CRITICAL_SECTION_END; |
| 763 | if (rest == NULL) |
| 764 | { |
| 765 | /* POSIX doesn't say strptime sets errno, and on glibc 2.3.2 for |
| 766 | instance it doesn't. Force a sensible value for our error |
| 767 | message. */ |
| 768 | errno = EINVAL; |
| 769 | scm_remember_upto_here_2 (format, string); |
| 770 | free (str); |
| 771 | free (fmt); |
| 772 | SCM_SYSERROR; |
| 773 | } |
| 774 | |
| 775 | /* tm_gmtoff is set by GNU glibc strptime "%s", so capture it when |
| 776 | available */ |
| 777 | #if HAVE_STRUCT_TM_TM_GMTOFF |
| 778 | zoff = - t.tm_gmtoff; /* seconds west, not east */ |
| 779 | #else |
| 780 | zoff = 0; |
| 781 | #endif |
| 782 | |
| 783 | /* Compute the number of UTF-8 characters. */ |
| 784 | used_len = u8_strnlen ((scm_t_uint8*) str, rest-str); |
| 785 | scm_remember_upto_here_2 (format, string); |
| 786 | free (str); |
| 787 | free (fmt); |
| 788 | |
| 789 | return scm_cons (filltime (&t, zoff, NULL), |
| 790 | scm_from_signed_integer (used_len)); |
| 791 | } |
| 792 | #undef FUNC_NAME |
| 793 | #endif /* HAVE_STRPTIME */ |
| 794 | |
| 795 | void |
| 796 | scm_init_stime() |
| 797 | { |
| 798 | scm_c_define ("internal-time-units-per-second", |
| 799 | scm_from_long (SCM_TIME_UNITS_PER_SECOND)); |
| 800 | |
| 801 | #ifdef HAVE_FTIME |
| 802 | if (!scm_your_base.time) ftime(&scm_your_base); |
| 803 | #else |
| 804 | if (!scm_your_base) time(&scm_your_base); |
| 805 | #endif |
| 806 | |
| 807 | if (!scm_my_base) scm_my_base = mytime(); |
| 808 | |
| 809 | scm_add_feature ("current-time"); |
| 810 | #include "libguile/stime.x" |
| 811 | } |
| 812 | |
| 813 | |
| 814 | /* |
| 815 | Local Variables: |
| 816 | c-file-style: "gnu" |
| 817 | End: |
| 818 | */ |