modules/time.c

   1 /* GNU m4 -- A simple macro processor
   2    Copyright (C) 1999, 2000, 2001, 2006, 2007, 2008, 2009 Free
   3    Software 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), M4ARGLEN (1),
 108                       &i);
 109       t = i;
 110     }
 111   else
 112     t = time (0L);
 113
 114   s = ctime (&t);
 115   obstack_grow (obs, s, 24);
 116 }
 117
 118 static void
 119 format_tm (m4_obstack *obs, struct tm *tm)
 120 {
 121   m4_shipout_int (obs, tm->tm_sec);
 122   obstack_1grow (obs, ',');
 123
 124   m4_shipout_int (obs, tm->tm_min);
 125   obstack_1grow (obs, ',');
 126
 127   m4_shipout_int (obs, tm->tm_hour);
 128   obstack_1grow (obs, ',');
 129
 130   m4_shipout_int (obs, tm->tm_mday);
 131   obstack_1grow (obs, ',');
 132
 133   m4_shipout_int (obs, tm->tm_mon);
 134   obstack_1grow (obs, ',');
 135
 136   m4_shipout_int (obs, tm->tm_year);
 137   obstack_1grow (obs, ',');
 138
 139   m4_shipout_int (obs, tm->tm_wday);
 140   obstack_1grow (obs, ',');
 141
 142   m4_shipout_int (obs, tm->tm_yday);
 143   obstack_1grow (obs, ',');
 144
 145   m4_shipout_int (obs, tm->tm_isdst);
 146 }
 147
 148 /**
 149  * gmtime(SECONDS)
 150  **/
 151 M4BUILTIN_HANDLER (gmtime)
 152 {
 153   time_t t;
 154   int i;
 155
 156   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), M4ARGLEN (1),
 157                        &i))
 158     return;
 159
 160   t = i;
 161   format_tm (obs, gmtime (&t));
 162 }
 163
 164 /**
 165  * localtime(SECONDS)
 166  **/
 167 M4BUILTIN_HANDLER (localtime)
 168 {
 169   time_t t;
 170   int i;
 171
 172   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (1), M4ARGLEN (1),
 173                        &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   const m4_call_info *me = m4_arg_info (argv);
 187   struct tm tm;
 188   time_t t;
 189
 190   if (!m4_numeric_arg (context, me, M4ARG (1), M4ARGLEN (1), &tm.tm_sec))
 191     return;
 192   if (!m4_numeric_arg (context, me, M4ARG (2), M4ARGLEN (2), &tm.tm_min))
 193     return;
 194   if (!m4_numeric_arg (context, me, M4ARG (3), M4ARGLEN (3), &tm.tm_hour))
 195     return;
 196   if (!m4_numeric_arg (context, me, M4ARG (4), M4ARGLEN (4), &tm.tm_mday))
 197     return;
 198   if (!m4_numeric_arg (context, me, M4ARG (5), M4ARGLEN (5), &tm.tm_mon))
 199     return;
 200   if (!m4_numeric_arg (context, me, M4ARG (6), M4ARGLEN (6), &tm.tm_year))
 201     return;
 202   if (M4ARG (7) && !m4_numeric_arg (context, me, M4ARG (7), M4ARGLEN (7),
 203                                     &tm.tm_isdst))
 204     return;
 205
 206   t = mktime (&tm);
 207
 208   m4_shipout_int (obs, t);
 209 }
 210 #endif /* HAVE_MKTIME */
 211
 212 #if HAVE_STRFTIME
 213 /**
 214  * strftime(FORMAT, SECONDS)
 215  **/
 216 M4BUILTIN_HANDLER (strftime)
 217 {
 218   struct tm *tm;
 219   time_t t;
 220   char *buf;
 221   int l;
 222
 223   if (!m4_numeric_arg (context, m4_arg_info (argv), M4ARG (2), M4ARGLEN (2),
 224                        &l))
 225     return;
 226
 227   t = l;
 228   tm = localtime (&t);
 229
 230   buf = (char *) obstack_alloc (obs, 1024);
 231   l = strftime (buf, 1024, M4ARG (1), tm);
 232   obstack_grow (obs, buf, l);
 233 }
 234 #endif /* HAVE_STRFTIME */