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      1 /* Expression parsing for plural form selection.
      2    Copyright (C) 2000, 2001 Free Software Foundation, Inc.
      3    Written by Ulrich Drepper <drepper (at) cygnus.com>, 2000.
      4 
      5    This program is free software; you can redistribute it and/or modify it
      6    under the terms of the GNU Library General Public License as published
      7    by the Free Software Foundation; either version 2, or (at your option)
      8    any later version.
      9 
     10    This program is distributed in the hope that it will be useful,
     11    but WITHOUT ANY WARRANTY; without even the implied warranty of
     12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13    Library General Public License for more details.
     14 
     15    You should have received a copy of the GNU Library General Public
     16    License along with this program; if not, write to the Free Software
     17    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
     18    USA.  */
     19 
     20 #ifdef HAVE_CONFIG_H
     21 # include <config.h>
     22 #endif
     23 
     24 #include <ctype.h>
     25 #include <stdlib.h>
     26 #include <string.h>
     27 
     28 #include "plural-exp.h"
     29 
     30 #if (defined __GNUC__ && !defined __APPLE_CC__) \
     31     || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
     32 
     33 /* These structs are the constant expression for the germanic plural
     34    form determination.  It represents the expression  "n != 1".  */
     35 static const struct expression plvar =
     36 {
     37   .nargs = 0,
     38   .operation = var,
     39 };
     40 static const struct expression plone =
     41 {
     42   .nargs = 0,
     43   .operation = num,
     44   .val =
     45   {
     46     .num = 1
     47   }
     48 };
     49 struct expression GERMANIC_PLURAL =
     50 {
     51   .nargs = 2,
     52   .operation = not_equal,
     53   .val =
     54   {
     55     .args =
     56     {
     57       [0] = (struct expression *) &plvar,
     58       [1] = (struct expression *) &plone
     59     }
     60   }
     61 };
     62 
     63 # define INIT_GERMANIC_PLURAL()
     64 
     65 #else
     66 
     67 /* For compilers without support for ISO C 99 struct/union initializers:
     68    Initialization at run-time.  */
     69 
     70 static struct expression plvar;
     71 static struct expression plone;
     72 struct expression GERMANIC_PLURAL;
     73 
     74 static void
     75 init_germanic_plural ()
     76 {
     77   if (plone.val.num == 0)
     78     {
     79       plvar.nargs = 0;
     80       plvar.operation = var;
     81 
     82       plone.nargs = 0;
     83       plone.operation = num;
     84       plone.val.num = 1;
     85 
     86       GERMANIC_PLURAL.nargs = 2;
     87       GERMANIC_PLURAL.operation = not_equal;
     88       GERMANIC_PLURAL.val.args[0] = &plvar;
     89       GERMANIC_PLURAL.val.args[1] = &plone;
     90     }
     91 }
     92 
     93 # define INIT_GERMANIC_PLURAL() init_germanic_plural ()
     94 
     95 #endif
     96 
     97 void
     98 internal_function
     99 EXTRACT_PLURAL_EXPRESSION (nullentry, pluralp, npluralsp)
    100      const char *nullentry;
    101      struct expression **pluralp;
    102      unsigned long int *npluralsp;
    103 {
    104   if (nullentry != NULL)
    105     {
    106       const char *plural;
    107       const char *nplurals;
    108 
    109       plural = strstr (nullentry, "plural=");
    110       nplurals = strstr (nullentry, "nplurals=");
    111       if (plural == NULL || nplurals == NULL)
    112 	goto no_plural;
    113       else
    114 	{
    115 	  char *endp;
    116 	  unsigned long int n;
    117 	  struct parse_args args;
    118 
    119 	  /* First get the number.  */
    120 	  nplurals += 9;
    121 	  while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
    122 	    ++nplurals;
    123 	  if (!(*nplurals >= '0' && *nplurals <= '9'))
    124 	    goto no_plural;
    125 #if defined HAVE_STRTOUL || defined _LIBC
    126 	  n = strtoul (nplurals, &endp, 10);
    127 #else
    128 	  for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
    129 	    n = n * 10 + (*endp - '0');
    130 #endif
    131 	  if (nplurals == endp)
    132 	    goto no_plural;
    133 	  *npluralsp = n;
    134 
    135 	  /* Due to the restrictions bison imposes onto the interface of the
    136 	     scanner function we have to put the input string and the result
    137 	     passed up from the parser into the same structure which address
    138 	     is passed down to the parser.  */
    139 	  plural += 7;
    140 	  args.cp = plural;
    141 	  if (PLURAL_PARSE (&args) != 0)
    142 	    goto no_plural;
    143 	  *pluralp = args.res;
    144 	}
    145     }
    146   else
    147     {
    148       /* By default we are using the Germanic form: singular form only
    149          for `one', the plural form otherwise.  Yes, this is also what
    150          English is using since English is a Germanic language.  */
    151     no_plural:
    152       INIT_GERMANIC_PLURAL ();
    153       *pluralp = &GERMANIC_PLURAL;
    154       *npluralsp = 2;
    155     }
    156 }
    157