locale/programs/linereader.h

   1 /* Copyright (C) 1996-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper, <drepper@gnu.org>.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published
   7    by the Free Software Foundation; version 2 of the License, or
   8    (at your option) 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _LINEREADER_H
  19 #define _LINEREADER_H 1
  20
  21 #include <ctype.h>
  22 #include <libintl.h>
  23 #include <stdint.h>
  24 #include <stdio.h>
  25
  26 #include "charmap.h"
  27 #include "error.h"
  28 #include "locfile-token.h"
  29 #include "repertoire.h"
  30
  31
  32 typedef const struct keyword_t *(*kw_hash_fct_t) (const char *, unsigned int);
  33 struct charset_t;
  34 struct localedef_t;
  35
  36 struct token
  37 {
  38   enum token_t tok;
  39   union
  40   {
  41     struct
  42     {
  43       char *startmb;
  44       size_t lenmb;
  45       uint32_t *startwc;
  46       size_t lenwc;
  47     } str;
  48     unsigned long int num;
  49     struct
  50     {
  51       /* This element is sized on the safe expectation that no single
  52          character in any character set uses more than 16 bytes.  */
  53       unsigned char bytes[16];
  54       int nbytes;
  55     } charcode;
  56     uint32_t ucs4;
  57   } val;
  58 };
  59
  60
  61 struct linereader
  62 {
  63   FILE *fp;
  64   const char *fname;
  65   char *buf;
  66   size_t bufsize;
  67   size_t bufact;
  68   size_t lineno;
  69
  70   size_t idx;
  71
  72   char comment_char;
  73   char escape_char;
  74
  75   struct token token;
  76
  77   int translate_strings;
  78   int return_widestr;
  79
  80   kw_hash_fct_t hash_fct;
  81 };
  82
  83
  84 /* Functions defined in linereader.c.  */
  85 extern struct linereader *lr_open (const char *fname, kw_hash_fct_t hf);
  86 extern struct linereader *lr_create (FILE *fp, const char *fname,
  87                                      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                                struct localedef_t *locale,
  94                                const struct repertoire_t *repertoire,
  95                                int verbose);
  96 extern void lr_ignore_rest (struct linereader *lr, int verbose);
  97
  98
  99 #define lr_error(lr, fmt, args...) \
 100   WITH_CUR_LOCALE (error_at_line (0, 0, lr->fname, lr->lineno, fmt, ## args))
 101
 102
 103
 104 static inline int
 105 __attribute ((always_inline))
 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 __attribute ((always_inline))
 124 lr_ungetc (struct linereader *lr, int ch)
 125 {
 126   if (lr->idx == 0)
 127     return -1;
 128
 129   if (ch != EOF)
 130     lr->buf[--lr->idx] = ch;
 131   return 0;
 132 }
 133
 134
 135 static inline int
 136 lr_ungetn (struct linereader *lr, size_t n)
 137 {
 138   if (lr->idx < n)
 139     return -1;
 140
 141   lr->idx -= n;
 142   return 0;
 143 }
 144
 145
 146 #endif /* linereader.h */