locale/programs/linereader.h

   1 /* Copyright (C) 1996, 1997, 1998, 1999 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    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 the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 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
  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 int lr_eof (struct linereader *lr);
  89 extern void lr_close (struct linereader *lr);
  90 extern int lr_next (struct linereader *lr);
  91 extern struct token *lr_token (struct linereader *lr,
  92                                const struct charmap_t *charmap,
  93                                const struct repertoire_t *repertoire);
  94
  95
  96 #define lr_error(lr, fmt, args...) \
  97   error_at_line (0, 0, lr->fname, lr->lineno, fmt, ## args)
  98
  99
 100
 101 static inline int
 102 lr_getc (struct linereader *lr)
 103 {
 104   if (lr->idx == lr->bufact)
 105     {
 106       if (lr->bufact != 0)
 107         if (lr_next (lr) < 0)
 108           return EOF;
 109
 110       if (lr->bufact == 0)
 111         return EOF;
 112     }
 113
 114   return lr->buf[lr->idx] == '\32' ? EOF : lr->buf[lr->idx++];
 115 }
 116
 117
 118 static inline int
 119 lr_ungetc (struct linereader *lr, int ch)
 120 {
 121   if (lr->idx == 0)
 122     return -1;
 123
 124   lr->buf[--lr->idx] = ch;
 125   return 0;
 126 }
 127
 128
 129 static inline int
 130 lr_ungetn (struct linereader *lr, size_t n)
 131 {
 132   if (lr->idx < n)
 133     return -1;
 134
 135   lr->idx -= n;
 136   return 0;
 137 }
 138
 139
 140 static inline void
 141 lr_ignore_rest (struct linereader *lr, int verbose)
 142 {
 143   if (verbose)
 144     {
 145       while (isspace (lr->buf[lr->idx]) && lr->buf[lr->idx] != '\n'
 146              && lr->buf[lr->idx] != lr->comment_char)
 147         if (lr->buf[lr->idx] == '\0')
 148           {
 149             if (lr_next (lr) < 0)
 150               return;
 151           }
 152         else
 153           ++lr->idx;
 154
 155       if (lr->buf[lr->idx] != '\n' &&lr->buf[lr->idx] != lr->comment_char)
 156         lr_error (lr, _("trailing garbage at end of line"));
 157     }
 158
 159   /* Ignore continued line.  */
 160   while (lr->bufact > 0 && lr->buf[lr->bufact - 1] != '\n')
 161     if (lr_next (lr) < 0)
 162       break;
 163
 164   lr->idx = lr->bufact;
 165 }
 166
 167
 168 #endif /* linereader.h */