libgm2/libm2iso/wraptime.cc

   1 /* wraptime.c provides access to time related system calls.
   2
   3 Copyright (C) 2009-2022 Free Software Foundation, Inc.
   4 Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
   5
   6 This file is part of GNU Modula-2.
   7
   8 GNU Modula-2 is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Modula-2 is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #include "config.h"
  28 #include <m2rts.h>
  29
  30 #define EXPORT(FUNC) m2iso ## _wraptime_ ## FUNC
  31 #define M2EXPORT(FUNC) m2iso ## _M2_wraptime_ ## FUNC
  32 #define M2LIBNAME "m2iso"
  33
  34 #if defined(HAVE_SYS_TYPES_H)
  35 #include "sys/types.h"
  36 #endif
  37
  38 #if defined(HAVE_SYS_TIME_H)
  39 #include "sys/time.h"
  40 #endif
  41
  42 #if defined(HAVE_TIME_H)
  43 #include "time.h"
  44 #endif
  45
  46 #if defined(HAVE_MALLOC_H)
  47 #include "malloc.h"
  48 #endif
  49
  50 #if defined(HAVE_LIMITS_H)
  51 #include "limits.h"
  52 #endif
  53
  54 #if !defined(NULL)
  55 #define NULL (void *)0
  56 #endif
  57
  58
  59 /* InitTimeval returns a newly created opaque type.  */
  60
  61 #if defined(HAVE_STRUCT_TIMEVAL) && defined(HAVE_MALLOC_H)
  62 extern "C" struct timeval *
  63 EXPORT(InitTimeval) (void)
  64 {
  65   return (struct timeval *)malloc (sizeof (struct timeval));
  66 }
  67 #else
  68 extern "C" void *
  69 EXPORT(InitTimeval) (void)
  70 {
  71   return NULL;
  72 }
  73 #endif
  74
  75 /* KillTimeval deallocates the memory associated with an opaque type.  */
  76
  77 extern "C" struct timeval *
  78 EXPORT(KillTimeval) (void *tv)
  79 {
  80 #if defined(HAVE_MALLOC_H)
  81   free (tv);
  82 #endif
  83   return NULL;
  84 }
  85
  86 /* InitTimezone returns a newly created opaque type.  */
  87
  88 #if defined(HAVE_STRUCT_TIMEZONE) && defined(HAVE_MALLOC_H)
  89 extern "C" struct timezone *
  90 EXPORT(InitTimezone) (void)
  91 {
  92   return (struct timezone *)malloc (sizeof (struct timezone));
  93 }
  94 #else
  95 extern "C" void *
  96 EXPORT(InitTimezone) (void)
  97 {
  98   return NULL;
  99 }
 100 #endif
 101
 102 /* KillTimezone - deallocates the memory associated with an opaque
 103    type.  */
 104
 105 extern "C" struct timezone *
 106 EXPORT(KillTimezone) (struct timezone *tv)
 107 {
 108 #if defined(HAVE_MALLOC_H)
 109   free (tv);
 110 #endif
 111   return NULL;
 112 }
 113
 114 /* InitTM - returns a newly created opaque type.  */
 115
 116 #if defined(HAVE_STRUCT_TM) && defined(HAVE_MALLOC_H)
 117 extern "C" struct tm *
 118 EXPORT(InitTM) (void)
 119 {
 120   return (struct tm *)malloc (sizeof (struct tm));
 121 }
 122 #else
 123 extern "C" void *
 124 EXPORT(InitTM) (void)
 125 {
 126   return NULL;
 127 }
 128 #endif
 129
 130 /* KillTM - deallocates the memory associated with an opaque type.  */
 131
 132 extern "C" struct tm *
 133 EXPORT(KillTM) (struct tm *tv)
 134 {
 135 #if defined(HAVE_MALLOC_H)
 136   free (tv);
 137 #endif
 138   return NULL;
 139 }
 140
 141 /* gettimeofday - calls gettimeofday(2) with the same parameters, tv,
 142    and, tz.  It returns 0 on success.  */
 143
 144 #if defined(HAVE_STRUCT_TIMEZONE) && defined(HAVE_GETTIMEOFDAY)
 145 extern "C" int
 146 EXPORT(gettimeofday) (void *tv, struct timezone *tz)
 147 {
 148   return gettimeofday (tv, tz);
 149 }
 150 #else
 151 extern "C" int
 152 EXPORT(gettimeofday) (void *tv, void *tz)
 153 {
 154   return -1;
 155 }
 156 #endif
 157
 158 /* settimeofday - calls settimeofday(2) with the same parameters, tv,
 159    and, tz.  It returns 0 on success.  */
 160
 161 #if defined(HAVE_STRUCT_TIMEZONE) && defined(HAVE_SETTIMEOFDAY)
 162 extern "C" int
 163 EXPORT(settimeofday) (void *tv, struct timezone *tz)
 164 {
 165   return settimeofday (tv, tz);
 166 }
 167 #else
 168 extern "C" int
 169 EXPORT(settimeofday) (void *tv, void *tz)
 170 {
 171   return -1;
 172 }
 173 #endif
 174
 175 /* wraptime_GetFractions - returns the tv_usec field inside the
 176    timeval structure.  */
 177
 178 #if defined(HAVE_STRUCT_TIMEVAL)
 179 extern "C" unsigned int
 180 EXPORT(GetFractions) (struct timeval *tv)
 181 {
 182   return (unsigned int)tv->tv_usec;
 183 }
 184 #else
 185 extern "C" unsigned int
 186 EXPORT(GetFractions) (void *tv)
 187 {
 188   return (unsigned int)-1;
 189 }
 190 #endif
 191
 192 /* localtime_r - returns the tm parameter, m, after it has been
 193    assigned with appropriate contents determined by, tv.  Notice that
 194    this procedure function expects, timeval, as its first parameter
 195    and not a time_t (as expected by the posix equivalent).  */
 196
 197 #if defined(HAVE_STRUCT_TIMEVAL)
 198 extern "C" struct tm *
 199 EXPORT(localtime_r) (struct timeval *tv, struct tm *m)
 200 {
 201   return localtime_r (&tv->tv_sec, m);
 202 }
 203 #else
 204 extern "C" struct tm *
 205 EXPORT(localtime_r) (void *tv, struct tm *m)
 206 {
 207   return m;
 208 }
 209 #endif
 210
 211 /* wraptime_GetYear - returns the year from the structure, m.  */
 212
 213 #if defined(HAVE_STRUCT_TM)
 214 extern "C" unsigned int
 215 EXPORT(GetYear) (struct tm *m)
 216 {
 217   return m->tm_year;
 218 }
 219 #else
 220 extern "C" unsigned int
 221 EXPORT(GetYear) (void *m)
 222 {
 223   return (unsigned int)-1;
 224 }
 225 #endif
 226
 227 /* wraptime_GetMonth - returns the month from the structure, m.  */
 228
 229 #if defined(HAVE_STRUCT_TM)
 230 extern "C" unsigned int
 231 EXPORT(GetMonth) (struct tm *m)
 232 {
 233   return m->tm_mon;
 234 }
 235 #else
 236 extern "C" unsigned int
 237 EXPORT(GetMonth) (void *m)
 238 {
 239   return (unsigned int)-1;
 240 }
 241 #endif
 242
 243 /* wraptime_GetDay - returns the day of the month from the structure,
 244    m.  */
 245
 246 #if defined(HAVE_STRUCT_TM)
 247 extern "C" unsigned int
 248 EXPORT(GetDay) (struct tm *m)
 249 {
 250   return m->tm_mday;
 251 }
 252 #else
 253 extern "C" unsigned int
 254 EXPORT(GetDay) (void *m)
 255 {
 256   return (unsigned int)-1;
 257 }
 258 #endif
 259
 260 /* wraptime_GetHour - returns the hour of the day from the structure,
 261    m.  */
 262
 263 #if defined(HAVE_STRUCT_TM)
 264 extern "C" unsigned int
 265 EXPORT(GetHour) (struct tm *m)
 266 {
 267   return m->tm_hour;
 268 }
 269 #else
 270 extern "C" unsigned int
 271 EXPORT(GetHour) (void *m)
 272 {
 273   return (unsigned int)-1;
 274 }
 275 #endif
 276
 277 /* wraptime_GetMinute - returns the minute within the hour from the
 278    structure, m.  */
 279
 280 #if defined(HAVE_STRUCT_TM)
 281 extern "C" unsigned int
 282 EXPORT(GetMinute) (struct tm *m)
 283 {
 284   return m->tm_min;
 285 }
 286 #else
 287 extern "C" unsigned int
 288 EXPORT(GetMinute) (void *m)
 289 {
 290   return (unsigned int)-1;
 291 }
 292 #endif
 293
 294 /* wraptime_GetSecond - returns the seconds in the minute from the
 295    structure, m.  The return value will always be in the range 0..59.
 296    A leap minute of value 60 will be truncated to 59.  */
 297
 298 #if defined(HAVE_STRUCT_TM)
 299 extern "C" unsigned int
 300 EXPORT(GetSecond) (struct tm *m)
 301 {
 302   if (m->tm_sec == 60)
 303     return 59;
 304   else
 305     return m->tm_sec;
 306 }
 307 #else
 308 extern "C" unsigned int
 309 EXPORT(GetSecond) (void *m)
 310 {
 311   return (unsigned int)-1;
 312 }
 313 #endif
 314
 315 /* wraptime_GetSummerTime - returns true if summer time is in effect.  */
 316
 317 #if defined(HAVE_STRUCT_TIMEZONE)
 318 extern "C" bool
 319 EXPORT(GetSummerTime) (struct timezone *tz)
 320 {
 321   return tz->tz_dsttime != 0;
 322 }
 323 #else
 324 extern "C" bool
 325 EXPORT(GetSummerTime) (void *tz)
 326 {
 327   return false;
 328 }
 329 #endif
 330
 331 /* wraptime_GetDST - returns the number of minutes west of GMT.  */
 332
 333 #if defined(HAVE_STRUCT_TIMEZONE)
 334 extern "C" int
 335 EXPORT(GetDST) (struct timezone *tz)
 336 {
 337   return tz->tz_minuteswest;
 338 }
 339 #else
 340 extern "C" int
 341 EXPORT(GetDST) (void *tz)
 342 {
 343 #if defined(INT_MIN)
 344   return INT_MIN;
 345 #else
 346   return (int)((unsigned int)-1);
 347 #endif
 348 }
 349 #endif
 350
 351 /* SetTimezone - set the timezone field inside timeval, tv.  */
 352
 353 #if defined(HAVE_STRUCT_TIMEZONE)
 354 extern "C" void
 355 EXPORT(SetTimezone) (struct timezone *tz, int zone, int minuteswest)
 356 {
 357   tz->tz_dsttime = zone;
 358   tz->tz_minuteswest = minuteswest;
 359 }
 360 #else
 361 extern "C" void
 362 EXPORT(SetTimezone) (void *tz, int zone, int minuteswest)
 363 {
 364 }
 365 #endif
 366
 367 /* SetTimeval - sets the fields in tm, t, with: second, minute, hour,
 368    day, month, year, fractions.  */
 369
 370 #if defined(HAVE_STRUCT_TIMEVAL)
 371 extern "C" void
 372 EXPORT(SetTimeval) (struct tm *t, unsigned int second, unsigned int minute,
 373                     unsigned int hour, unsigned int day, unsigned int month,
 374                     unsigned int year, unsigned int yday, unsigned int wday,
 375                     unsigned int isdst)
 376 {
 377   t->tm_sec = second;
 378   t->tm_min = minute;
 379   t->tm_hour = hour;
 380   t->tm_mday = day;
 381   t->tm_mon = month;
 382   t->tm_year = year;
 383   t->tm_yday = yday;
 384   t->tm_wday = wday;
 385   t->tm_isdst = isdst;
 386 }
 387 #else
 388 extern "C" void
 389 EXPORT(SetTimeval) (void *t, unsigned int second, unsigned int minute,
 390                     unsigned int hour, unsigned int day, unsigned int month,
 391                     unsigned int year, unsigned int yday, unsigned int wday,
 392                     unsigned int isdst)
 393 {
 394 }
 395 #endif
 396
 397 /* init - init/finish functions for the module */
 398
 399 /* GNU Modula-2 linking hooks.  */
 400
 401 extern "C" void
 402 M2EXPORT(init) (int, char **, char **)
 403 {
 404 }
 405
 406 extern "C" void
 407 M2EXPORT(fini) (int, char **, char **)
 408 {
 409 }
 410
 411 extern "C" void
 412 M2EXPORT(dep) (void)
 413 {
 414 }
 415
 416 extern "C" void __attribute__((__constructor__))
 417 M2EXPORT(ctor) (void)
 418 {
 419   m2iso_M2RTS_RegisterModule ("wraptime", M2LIBNAME,
 420                               M2EXPORT(init), M2EXPORT(fini),
 421                               M2EXPORT(dep));
 422 }