modules/time.c

   1 /* GNU m4 -- A simple macro processor
   2    Copyright (C) 1999, 2000, 2001, 2006, 2007, 2008 Free Software
   3    Foundation, 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 /* Rename exported symbols for dlpreload()ing.  */
  38 #define m4_builtin_table        time_LTX_m4_builtin_table
  39
  40 /*         function     macros  blind   side    minargs maxargs */
  41 #define builtin_functions                                       \
  42   BUILTIN (currenttime, false,  false,  false,  0,      0  )    \
  43   BUILTIN (ctime,       false,  false,  false,  0,      1  )    \
  44   BUILTIN (gmtime,      false,  true,   false,  1,      1  )    \
  45   BUILTIN (localtime,   false,  true,   false,  1,      1  )    \
  46
  47 #define mktime_functions                                        \
  48   BUILTIN (mktime,      false,  true,   false,  6,      7  )    \
  49
  50 #define strftime_functions                                      \
  51   BUILTIN (strftime,    false,  true,   false,  2,      2  )    \
  52
  53
  54 #define BUILTIN(handler, macros, blind, side, min, max)  M4BUILTIN (handler)
  55   builtin_functions
  56 # if HAVE_MKTIME
  57   mktime_functions
  58 # endif
  59 # if HAVE_STRFTIME
  60   strftime_functions
  61 # endif
  62 #undef BUILTIN
  63
  64 const m4_builtin m4_builtin_table[] =
  65 {
  66 #define BUILTIN(handler, macros, blind, side, min, max)                 \
  67   M4BUILTIN_ENTRY (handler, #handler, macros, blind, side, min, max)
  68
  69   builtin_functions
  70 # if HAVE_MKTIME
  71   mktime_functions
  72 # endif
  73 # if HAVE_STRFTIME
  74   strftime_functions
  75 # endif
  76 #undef BUILTIN
  77
  78   { NULL, NULL, 0, 0, 0 },
  79 };
  80 \f
  81 /**
  82  * currenttime()
  83  **/
  84 M4BUILTIN_HANDLER (currenttime)
  85 {
  86   char buf[64];
  87   time_t now;
  88   int l;
  89
  90   now = time (0L);
  91   l = sprintf (buf, "%ld", now);
  92
  93   obstack_grow (obs, buf, l);
  94 }
  95
  96 /**
  97  * ctime([SECONDS])
  98  **/
  99 M4BUILTIN_HANDLER (ctime)
 100 {
 101   time_t t;
 102   int i;
 103   const char *s;
 104
 105   if (argc == 2)
 106     {
 107       m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), &i);
 108       t = i;
 109     }
 110   else
 111     t = time (0L);
 112
 113   s = ctime (&t);
 114   obstack_grow (obs, s, 24);
 115 }
 116
 117 static void
 118 format_tm (m4_obstack *obs, struct tm *tm)
 119 {
 120   m4_shipout_int (obs, tm->tm_sec);
 121   obstack_1grow (obs, ',');
 122
 123   m4_shipout_int (obs, tm->tm_min);
 124   obstack_1grow (obs, ',');
 125
 126   m4_shipout_int (obs, tm->tm_hour);
 127   obstack_1grow (obs, ',');
 128
 129   m4_shipout_int (obs, tm->tm_mday);
 130   obstack_1grow (obs, ',');
 131
 132   m4_shipout_int (obs, tm->tm_mon);
 133   obstack_1grow (obs, ',');
 134
 135   m4_shipout_int (obs, tm->tm_year);
 136   obstack_1grow (obs, ',');
 137
 138   m4_shipout_int (obs, tm->tm_wday);
 139   obstack_1grow (obs, ',');
 140
 141   m4_shipout_int (obs, tm->tm_yday);
 142   obstack_1grow (obs, ',');
 143
 144   m4_shipout_int (obs, tm->tm_isdst);
 145 }
 146
 147 /**
 148  * gmtime(SECONDS)
 149  **/
 150 M4BUILTIN_HANDLER (gmtime)
 151 {
 152   time_t t;
 153   int i;
 154
 155   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), &i))
 156     return;
 157
 158   t = i;
 159   format_tm (obs, gmtime (&t));
 160 }
 161
 162 /**
 163  * localtime(SECONDS)
 164  **/
 165 M4BUILTIN_HANDLER (localtime)
 166 {
 167   time_t t;
 168   int i;
 169
 170   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), &i))
 171     return;
 172
 173   t = i;
 174   format_tm (obs, localtime (&t));
 175 }
 176
 177 #if HAVE_MKTIME
 178 /**
 179  * mktime(SEC, MIN, HOUR, MDAY, MONTH, YEAR, [ISDST])
 180  **/
 181 M4BUILTIN_HANDLER (mktime)
 182 {
 183   const m4_call_info *me = m4_arg_info (argv);
 184   struct tm tm;
 185   time_t t;
 186
 187   if (!m4_numeric_arg (context, me, M4ARG (1), &tm.tm_sec))
 188     return;
 189   if (!m4_numeric_arg (context, me, M4ARG (2), &tm.tm_min))
 190     return;
 191   if (!m4_numeric_arg (context, me, M4ARG (3), &tm.tm_hour))
 192     return;
 193   if (!m4_numeric_arg (context, me, M4ARG (4), &tm.tm_mday))
 194     return;
 195   if (!m4_numeric_arg (context, me, M4ARG (5), &tm.tm_mon))
 196     return;
 197   if (!m4_numeric_arg (context, me, M4ARG (6), &tm.tm_year))
 198     return;
 199   if (M4ARG (7) && !m4_numeric_arg (context, me, M4ARG (7), &tm.tm_isdst))
 200     return;
 201
 202   t = mktime (&tm);
 203
 204   m4_shipout_int (obs, t);
 205 }
 206 #endif /* HAVE_MKTIME */
 207
 208 #if HAVE_STRFTIME
 209 /**
 210  * strftime(FORMAT, SECONDS)
 211  **/
 212 M4BUILTIN_HANDLER (strftime)
 213 {
 214   struct tm *tm;
 215   time_t t;
 216   char *buf;
 217   int l;
 218
 219   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (2), &l))
 220     return;
 221
 222   t = l;
 223   tm = localtime (&t);
 224
 225   buf = (char *) obstack_alloc (obs, 1024);
 226   l = strftime (buf, 1024, M4ARG (1), tm);
 227   obstack_grow (obs, buf, l);
 228 }
 229 #endif /* HAVE_STRFTIME */