locale/programs/linereader.h

   1 /* Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper, <drepper@gnu.org>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _LINEREADER_H
  21 #define _LINEREADER_H 1
  22
  23 #include <ctype.h>
  24 #include <libintl.h>
  25 #include <stdint.h>
  26 #include <stdio.h>
  27
  28 #include "charmap.h"
  29 #include "error.h"
  30 #include "locfile-token.h"
  31 #include "repertoire.h"
  32
  33
  34 typedef const struct keyword_t *(*kw_hash_fct_t) (const char *, unsigned int);
  35 struct charset_t;
  36 struct localedef_t;
  37
  38 struct token
  39 {
  40   enum token_t tok;
  41   union
  42   {
  43     struct
  44     {
  45       char *startmb;
  46       size_t lenmb;
  47       uint32_t *startwc;
  48       size_t lenwc;
  49     } str;
  50     unsigned long int num;
  51     struct
  52     {
  53       /* This element is sized on the safe expectation that no single
  54          character in any character set uses more then 16 bytes.  */
  55       unsigned char bytes[16];
  56       int nbytes;
  57     } charcode;
  58     uint32_t ucs4;
  59   } val;
  60 };
  61
  62
  63 struct linereader
  64 {
  65   FILE *fp;
  66   const char *fname;
  67   char *buf;
  68   size_t bufsize;
  69   size_t bufact;
  70   size_t lineno;
  71
  72   size_t idx;
  73
  74   char comment_char;
  75   char escape_char;
  76
  77   struct token token;
  78
  79   int translate_strings;
  80   int return_widestr;
  81
  82   kw_hash_fct_t hash_fct;
  83 };
  84
  85
  86 /* Functions defined in linereader.c.  */
  87 extern struct linereader *lr_open (const char *fname, kw_hash_fct_t hf);
  88 extern struct linereader *lr_create (FILE *fp, const char *fname,
  89                                      kw_hash_fct_t hf);
  90 extern int lr_eof (struct linereader *lr);
  91 extern void lr_close (struct linereader *lr);
  92 extern int lr_next (struct linereader *lr);
  93 extern struct token *lr_token (struct linereader *lr,
  94                                const struct charmap_t *charmap,
  95                                struct localedef_t *locale,
  96                                const struct repertoire_t *repertoire,
  97                                int verbose);
  98
  99
 100 #define lr_error(lr, fmt, args...) \
 101   error_at_line (0, 0, lr->fname, lr->lineno, fmt, ## args)
 102
 103
 104
 105 static inline int
 106 lr_getc (struct linereader *lr)
 107 {
 108   if (lr->idx == lr->bufact)
 109     {
 110       if (lr->bufact != 0)
 111         if (lr_next (lr) < 0)
 112           return EOF;
 113
 114       if (lr->bufact == 0)
 115         return EOF;
 116     }
 117
 118   return lr->buf[lr->idx] == '\32' ? EOF : lr->buf[lr->idx++];
 119 }
 120
 121
 122 static inline int
 123 lr_ungetc (struct linereader *lr, int ch)
 124 {
 125   if (lr->idx == 0)
 126     return -1;
 127
 128   if (ch != EOF)
 129     lr->buf[--lr->idx] = ch;
 130   return 0;
 131 }
 132
 133
 134 static inline int
 135 lr_ungetn (struct linereader *lr, size_t n)
 136 {
 137   if (lr->idx < n)
 138     return -1;
 139
 140   lr->idx -= n;
 141   return 0;
 142 }
 143
 144
 145 static inline void
 146 lr_ignore_rest (struct linereader *lr, int verbose)
 147 {
 148   if (verbose)
 149     {
 150       while (isspace (lr->buf[lr->idx]) && lr->buf[lr->idx] != '\n'
 151              && lr->buf[lr->idx] != lr->comment_char)
 152         if (lr->buf[lr->idx] == '\0')
 153           {
 154             if (lr_next (lr) < 0)
 155               return;
 156           }
 157         else
 158           ++lr->idx;
 159
 160       if (lr->buf[lr->idx] != '\n' && ! feof (lr->fp)
 161           && lr->buf[lr->idx] != lr->comment_char)
 162         lr_error (lr, _("trailing garbage at end of line"));
 163     }
 164
 165   /* Ignore continued line.  */
 166   while (lr->bufact > 0 && lr->buf[lr->bufact - 1] != '\n')
 167     if (lr_next (lr) < 0)
 168       break;
 169
 170   lr->idx = lr->bufact;
 171 }
 172
 173
 174 #endif /* linereader.h */