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      1 /* Expression parsing for plural form selection.
      2    Copyright (C) 2000-2001, 2003 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
     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 (const char *nullentry, struct expression **pluralp,
    100 			   unsigned long int *npluralsp)
    101 {
    102   if (nullentry != NULL)
    103     {
    104       const char *plural;
    105       const char *nplurals;
    106 
    107       plural = strstr (nullentry, "plural=");
    108       nplurals = strstr (nullentry, "nplurals=");
    109       if (plural == NULL || nplurals == NULL)
    110 	goto no_plural;
    111       else
    112 	{
    113 	  char *endp;
    114 	  unsigned long int n;
    115 	  struct parse_args args;
    116 
    117 	  /* First get the number.  */
    118 	  nplurals += 9;
    119 	  while (*nplurals != '\0' && isspace ((unsigned char) *nplurals))
    120 	    ++nplurals;
    121 	  if (!(*nplurals >= '0' && *nplurals <= '9'))
    122 	    goto no_plural;
    123 #if defined HAVE_STRTOUL || defined _LIBC
    124 	  n = strtoul (nplurals, &endp, 10);
    125 #else
    126 	  for (endp = nplurals, n = 0; *endp >= '0' && *endp <= '9'; endp++)
    127 	    n = n * 10 + (*endp - '0');
    128 #endif
    129 	  if (nplurals == endp)
    130 	    goto no_plural;
    131 	  *npluralsp = n;
    132 
    133 	  /* Due to the restrictions bison imposes onto the interface of the
    134 	     scanner function we have to put the input string and the result
    135 	     passed up from the parser into the same structure which address
    136 	     is passed down to the parser.  */
    137 	  plural += 7;
    138 	  args.cp = plural;
    139 	  if (PLURAL_PARSE (&args) != 0)
    140 	    goto no_plural;
    141 	  *pluralp = args.res;
    142 	}
    143     }
    144   else
    145     {
    146       /* By default we are using the Germanic form: singular form only
    147          for `one', the plural form otherwise.  Yes, this is also what
    148          English is using since English is a Germanic language.  */
    149     no_plural:
    150       INIT_GERMANIC_PLURAL ();
    151       *pluralp = &GERMANIC_PLURAL;
    152       *npluralsp = 2;
    153     }
    154 }
    155