/* Copyright (C) 1996-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper, <drepper@gnu.org>.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published
   by the Free Software Foundation; version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#ifndef _LINEREADER_H
#define _LINEREADER_H 1

#include <ctype.h>
#include <libintl.h>
#include <stdint.h>
#include <stdio.h>

#include "third_party/glibc_locales/programs/charmap.h"
#include "third_party/glibc_locales/programs/locfile-token.h"
#include "third_party/glibc_locales/programs/repertoire.h"

typedef const struct keyword_t *(*kw_hash_fct_t)(const char *, unsigned int);
struct charset_t;
struct localedef_t;

struct token {
  enum token_t tok;
  union {
    struct {
      char *startmb;
      size_t lenmb;
      uint32_t *startwc;
      size_t lenwc;
    } str;
    unsigned long int num;
    struct {
      /* This element is sized on the safe expectation that no single
         character in any character set uses more than 16 bytes.  */
      unsigned char bytes[16];
      int nbytes;
    } charcode;
    uint32_t ucs4;
  } val;
};

struct linereader {
  FILE *fp;
  const char *fname;
  char *buf;
  size_t bufsize;
  size_t bufact;
  size_t lineno;

  size_t idx;

  char comment_char;
  char escape_char;

  struct token token;

  int translate_strings;
  int return_widestr;

  kw_hash_fct_t hash_fct;
};

/* Functions defined in linereader.c.  */
extern struct linereader *lr_open(const char *fname, kw_hash_fct_t hf);
extern struct linereader *lr_create(FILE *fp, const char *fname,
                                    kw_hash_fct_t hf);
extern int lr_eof(struct linereader *lr);
extern void lr_close(struct linereader *lr);
extern int lr_next(struct linereader *lr);
extern struct token *lr_token(struct linereader *lr,
                              const struct charmap_t *charmap,
                              struct localedef_t *locale,
                              const struct repertoire_t *repertoire,
                              int verbose);
extern void lr_ignore_rest(struct linereader *lr, int verbose);

#define lr_error(lr, fmt, args...) \
  WITH_CUR_LOCALE(error_at_line(0, 0, lr->fname, lr->lineno, fmt, ##args))

static inline int __attribute((always_inline)) lr_getc(struct linereader *lr) {
  if (lr->idx == lr->bufact) {
    if (lr->bufact != 0)
      if (lr_next(lr) < 0) return EOF;

    if (lr->bufact == 0) return EOF;
  }

  return lr->buf[lr->idx] == '\32' ? EOF : lr->buf[lr->idx++];
}

static inline int __attribute((always_inline))
lr_ungetc(struct linereader *lr, int ch) {
  if (lr->idx == 0) return -1;

  if (ch != EOF) lr->buf[--lr->idx] = ch;
  return 0;
}

static inline int lr_ungetn(struct linereader *lr, size_t n) {
  if (lr->idx < n) return -1;

  lr->idx -= n;
  return 0;
}

#endif /* linereader.h */