modules/time.c

   1 /* GNU m4 -- A simple macro processor
   2    Copyright (C) 1999, 2000, 2001, 2006, 2007 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17    02110-1301  USA
  18 */
  19
  20 #include <config.h>
  21
  22 #if TM_IN_SYS_TIME
  23 #  include <sys/time.h>
  24 #else
  25 #  include <time.h>
  26 #endif /* TM_IN_SYS_TIME */
  27
  28 /* Build using only the exported interfaces, unless NDEBUG is set, in
  29    which case use private symbols to speed things up as much as possible.  */
  30 #ifndef NDEBUG
  31 #  include <m4/m4module.h>
  32 #else
  33 #  include "m4private.h"
  34 #endif
  35
  36 /* Rename exported symbols for dlpreload()ing.  */
  37 #define m4_builtin_table        time_LTX_m4_builtin_table
  38
  39 /*         function     macros  blind   side    minargs maxargs */
  40 #define builtin_functions                                       \
  41   BUILTIN (currenttime, false,  false,  false,  0,      0  )    \
  42   BUILTIN (ctime,       false,  false,  false,  0,      1  )    \
  43   BUILTIN (gmtime,      false,  true,   false,  1,      1  )    \
  44   BUILTIN (localtime,   false,  true,   false,  1,      1  )    \
  45
  46 #define mktime_functions                                        \
  47   BUILTIN (mktime,      false,  true,   false,  6,      7  )    \
  48
  49 #define strftime_functions                                      \
  50   BUILTIN (strftime,    false,  true,   false,  2,      2  )    \
  51
  52
  53 #define BUILTIN(handler, macros, blind, side, min, max)  M4BUILTIN(handler)
  54   builtin_functions
  55 # if HAVE_MKTIME
  56   mktime_functions
  57 # endif
  58 # if HAVE_STRFTIME
  59   strftime_functions
  60 # endif
  61 #undef BUILTIN
  62
  63 m4_builtin m4_builtin_table[] =
  64 {
  65 #define BUILTIN(handler, macros, blind, side, min, max) \
  66   { CONC(builtin_, handler), STR(handler),              \
  67     ((macros ? M4_BUILTIN_GROKS_MACRO : 0)              \
  68      | (blind ? M4_BUILTIN_BLIND : 0)                   \
  69      | (side ? M4_BUILTIN_SIDE_EFFECT : 0)),            \
  70     min, max },
  71
  72   builtin_functions
  73 # if HAVE_MKTIME
  74   mktime_functions
  75 # endif
  76 # if HAVE_STRFTIME
  77   strftime_functions
  78 # endif
  79 #undef BUILTIN
  80
  81   { NULL, NULL, 0, 0, 0 },
  82 };
  83 \f
  84 /**
  85  * currenttime()
  86  **/
  87 M4BUILTIN_HANDLER (currenttime)
  88 {
  89   char buf[64];
  90   time_t now;
  91   int l;
  92
  93   now = time (0L);
  94   l = sprintf (buf, "%ld", now);
  95
  96   obstack_grow (obs, buf, l);
  97 }
  98
  99 /**
 100  * ctime([SECONDS])
 101  **/
 102 M4BUILTIN_HANDLER (ctime)
 103 {
 104   time_t t;
 105   int i;
 106   const char *s;
 107
 108   if (argc == 2)
 109     {
 110       m4_numeric_arg (context, argc, argv, 1, &i);
 111       t = i;
 112     }
 113   else
 114     t = time (0L);
 115
 116   s = ctime (&t);
 117   obstack_grow (obs, s, 24);
 118 }
 119
 120 static void
 121 format_tm (m4_obstack *obs, struct tm *tm)
 122 {
 123   m4_shipout_int (obs, tm->tm_sec);
 124   obstack_1grow (obs, ',');
 125
 126   m4_shipout_int (obs, tm->tm_min);
 127   obstack_1grow (obs, ',');
 128
 129   m4_shipout_int (obs, tm->tm_hour);
 130   obstack_1grow (obs, ',');
 131
 132   m4_shipout_int (obs, tm->tm_mday);
 133   obstack_1grow (obs, ',');
 134
 135   m4_shipout_int (obs, tm->tm_mon);
 136   obstack_1grow (obs, ',');
 137
 138   m4_shipout_int (obs, tm->tm_year);
 139   obstack_1grow (obs, ',');
 140
 141   m4_shipout_int (obs, tm->tm_wday);
 142   obstack_1grow (obs, ',');
 143
 144   m4_shipout_int (obs, tm->tm_yday);
 145   obstack_1grow (obs, ',');
 146
 147   m4_shipout_int (obs, tm->tm_isdst);
 148 }
 149
 150 /**
 151  * gmtime(SECONDS)
 152  **/
 153 M4BUILTIN_HANDLER (gmtime)
 154 {
 155   time_t t;
 156   int i;
 157
 158   if (!m4_numeric_arg (context, argc, argv, 1, &i))
 159     return;
 160
 161   t = i;
 162   format_tm (obs, gmtime (&t));
 163 }
 164
 165 /**
 166  * localtime(SECONDS)
 167  **/
 168 M4BUILTIN_HANDLER (localtime)
 169 {
 170   time_t t;
 171   int i;
 172
 173   if (!m4_numeric_arg (context, argc, argv, 1, &i))
 174     return;
 175
 176   t = i;
 177   format_tm (obs, localtime (&t));
 178 }
 179
 180 #if HAVE_MKTIME
 181 /**
 182  * mktime(SEC, MIN, HOUR, MDAY, MONTH, YEAR, [ISDST])
 183  **/
 184 M4BUILTIN_HANDLER (mktime)
 185 {
 186   struct tm tm;
 187   time_t t;
 188
 189   if (!m4_numeric_arg (context, argc, argv, 1, &tm.tm_sec))
 190     return;
 191   if (!m4_numeric_arg (context, argc, argv, 2, &tm.tm_min))
 192     return;
 193   if (!m4_numeric_arg (context, argc, argv, 3, &tm.tm_hour))
 194     return;
 195   if (!m4_numeric_arg (context, argc, argv, 4, &tm.tm_mday))
 196     return;
 197   if (!m4_numeric_arg (context, argc, argv, 5, &tm.tm_mon))
 198     return;
 199   if (!m4_numeric_arg (context, argc, argv, 6, &tm.tm_year))
 200     return;
 201   if (M4ARG (7) && !m4_numeric_arg (context, argc, argv, 7, &tm.tm_isdst))
 202     return;
 203
 204   t = mktime (&tm);
 205
 206   m4_shipout_int (obs, t);
 207 }
 208 #endif /* HAVE_MKTIME */
 209
 210 #if HAVE_STRFTIME
 211 /**
 212  * strftime(FORMAT, SECONDS)
 213  **/
 214 M4BUILTIN_HANDLER (strftime)
 215 {
 216   struct tm *tm;
 217   time_t t;
 218   char *buf;
 219   int l;
 220
 221   if (!m4_numeric_arg (context, argc, argv, 2, &l))
 222     return;
 223
 224   t = l;
 225   tm = localtime (&t);
 226
 227   buf = (char *) obstack_alloc (obs, 1024);
 228   l = strftime (buf, 1024, M4ARG (1), tm);
 229   obstack_grow (obs, buf, l);
 230 }
 231 #endif /* HAVE_STRFTIME */