modules/time.c

   1 /* GNU m4 -- A simple macro processor
   2    Copyright (C) 1999-2001, 2006-2010, 2013 Free Software Foundation,
   3    Inc.
   4
   5    This file is part of GNU M4.
   6
   7    GNU M4 is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    GNU M4 is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <config.h>
  22
  23 #if TM_IN_SYS_TIME
  24 #  include <sys/time.h>
  25 #else
  26 #  include <time.h>
  27 #endif /* TM_IN_SYS_TIME */
  28
  29 /* Build using only the exported interfaces, unless NDEBUG is set, in
  30    which case use private symbols to speed things up as much as possible.  */
  31 #ifndef NDEBUG
  32 #  include <m4/m4module.h>
  33 #else
  34 #  include "m4private.h"
  35 #endif
  36
  37 /*         function     macros  blind   side    minargs maxargs */
  38 #define builtin_functions                                       \
  39   BUILTIN (currenttime, false,  false,  false,  0,      0  )    \
  40   BUILTIN (ctime,       false,  false,  false,  0,      1  )    \
  41   BUILTIN (gmtime,      false,  true,   false,  1,      1  )    \
  42   BUILTIN (localtime,   false,  true,   false,  1,      1  )    \
  43
  44 #define mktime_functions                                        \
  45   BUILTIN (mktime,      false,  true,   false,  6,      7  )    \
  46
  47 #define strftime_functions                                      \
  48   BUILTIN (strftime,    false,  true,   false,  2,      2  )    \
  49
  50
  51 #define BUILTIN(handler, macros, blind, side, min, max)  M4BUILTIN (handler)
  52   builtin_functions
  53 # if HAVE_MKTIME
  54   mktime_functions
  55 # endif
  56 # if HAVE_STRFTIME
  57   strftime_functions
  58 # endif
  59 #undef BUILTIN
  60
  61 static const m4_builtin m4_builtin_table[] =
  62 {
  63 #define BUILTIN(handler, macros, blind, side, min, max)                 \
  64   M4BUILTIN_ENTRY (handler, #handler, macros, blind, side, min, max)
  65
  66   builtin_functions
  67 # if HAVE_MKTIME
  68   mktime_functions
  69 # endif
  70 # if HAVE_STRFTIME
  71   strftime_functions
  72 # endif
  73 #undef BUILTIN
  74
  75   { NULL, NULL, 0, 0, 0 },
  76 };
  77
  78
  79 void
  80 include_time (m4 *context, m4_module *module, m4_obstack *obs)
  81 {
  82   m4_install_builtins (context, module, m4_builtin_table);
  83 }
  84
  85
  86 \f
  87 /**
  88  * currenttime()
  89  **/
  90 M4BUILTIN_HANDLER (currenttime)
  91 {
  92   char buf[64];
  93   time_t now;
  94   int l;
  95
  96   now = time (0L);
  97   l = sprintf (buf, "%ld", now);
  98
  99   obstack_grow (obs, buf, l);
 100 }
 101
 102 /**
 103  * ctime([SECONDS])
 104  **/
 105 M4BUILTIN_HANDLER (ctime)
 106 {
 107   time_t t;
 108   int i;
 109   const char *s;
 110
 111   if (argc == 2)
 112     {
 113       m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), M4ARGLEN (1),
 114                       &i);
 115       t = i;
 116     }
 117   else
 118     t = time (0L);
 119
 120   s = ctime (&t);
 121   obstack_grow (obs, s, 24);
 122 }
 123
 124 static void
 125 format_tm (m4_obstack *obs, struct tm *tm)
 126 {
 127   m4_shipout_int (obs, tm->tm_sec);
 128   obstack_1grow (obs, ',');
 129
 130   m4_shipout_int (obs, tm->tm_min);
 131   obstack_1grow (obs, ',');
 132
 133   m4_shipout_int (obs, tm->tm_hour);
 134   obstack_1grow (obs, ',');
 135
 136   m4_shipout_int (obs, tm->tm_mday);
 137   obstack_1grow (obs, ',');
 138
 139   m4_shipout_int (obs, tm->tm_mon);
 140   obstack_1grow (obs, ',');
 141
 142   m4_shipout_int (obs, tm->tm_year);
 143   obstack_1grow (obs, ',');
 144
 145   m4_shipout_int (obs, tm->tm_wday);
 146   obstack_1grow (obs, ',');
 147
 148   m4_shipout_int (obs, tm->tm_yday);
 149   obstack_1grow (obs, ',');
 150
 151   m4_shipout_int (obs, tm->tm_isdst);
 152 }
 153
 154 /**
 155  * gmtime(SECONDS)
 156  **/
 157 M4BUILTIN_HANDLER (gmtime)
 158 {
 159   time_t t;
 160   int i;
 161
 162   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), M4ARGLEN (1),
 163                        &i))
 164     return;
 165
 166   t = i;
 167   format_tm (obs, gmtime (&t));
 168 }
 169
 170 /**
 171  * localtime(SECONDS)
 172  **/
 173 M4BUILTIN_HANDLER (localtime)
 174 {
 175   time_t t;
 176   int i;
 177
 178   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), M4ARGLEN (1),
 179                        &i))
 180     return;
 181
 182   t = i;
 183   format_tm (obs, localtime (&t));
 184 }
 185
 186 #if HAVE_MKTIME
 187 /**
 188  * mktime(SEC, MIN, HOUR, MDAY, MONTH, YEAR, [ISDST])
 189  **/
 190 M4BUILTIN_HANDLER (mktime)
 191 {
 192   const m4_call_info *me = m4_arg_info (argv);
 193   struct tm tm;
 194   time_t t;
 195
 196   if (!m4_numeric_arg (context, me, M4ARG (1), M4ARGLEN (1), &tm.tm_sec))
 197     return;
 198   if (!m4_numeric_arg (context, me, M4ARG (2), M4ARGLEN (2), &tm.tm_min))
 199     return;
 200   if (!m4_numeric_arg (context, me, M4ARG (3), M4ARGLEN (3), &tm.tm_hour))
 201     return;
 202   if (!m4_numeric_arg (context, me, M4ARG (4), M4ARGLEN (4), &tm.tm_mday))
 203     return;
 204   if (!m4_numeric_arg (context, me, M4ARG (5), M4ARGLEN (5), &tm.tm_mon))
 205     return;
 206   if (!m4_numeric_arg (context, me, M4ARG (6), M4ARGLEN (6), &tm.tm_year))
 207     return;
 208   if (M4ARG (7) && !m4_numeric_arg (context, me, M4ARG (7), M4ARGLEN (7),
 209                                     &tm.tm_isdst))
 210     return;
 211
 212   t = mktime (&tm);
 213
 214   m4_shipout_int (obs, t);
 215 }
 216 #endif /* HAVE_MKTIME */
 217
 218 #if HAVE_STRFTIME
 219 /**
 220  * strftime(FORMAT, SECONDS)
 221  **/
 222 M4BUILTIN_HANDLER (strftime)
 223 {
 224   struct tm *tm;
 225   time_t t;
 226   char *buf;
 227   int l;
 228
 229   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (2), M4ARGLEN (2),
 230                        &l))
 231     return;
 232
 233   t = l;
 234   tm = localtime (&t);
 235
 236   buf = (char *) obstack_alloc (obs, 1024);
 237   l = strftime (buf, 1024, M4ARG (1), tm);
 238   obstack_grow (obs, buf, l);
 239 }
 240 #endif /* HAVE_STRFTIME */