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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@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
init_germanic_plural()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
EXTRACT_PLURAL_EXPRESSION(const char * nullentry,struct expression ** pluralp,unsigned long int * npluralsp)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