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Sourcecode: fhist version File versions

file.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 2000, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    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; either 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, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions for reading input from files
 */

#include <ac/unistd.h>

#include <error.h>
#include <fcheck.h>
#include <input/file.h>
#include <input/private.h>
#include <input/stdin.h>
#include <mem.h>
#include <str.h>
#include <error_intl.h>

typedef struct input_file_ty input_file_ty;
struct input_file_ty
{
      input_ty    inherited;
      FILE        *fp;
      string_ty   *fn;
      int         unlink_on_close;
      long        pos;
};


static void
destruct(input_ty *p)
{
      input_file_ty     *this;

      this = (input_file_ty *)p;
      fclose_and_check(this->fp, this->fn->str_text);
      if (this->unlink_on_close)
            unlink(this->fn->str_text);
      str_free(this->fn);
      this->fp = 0;
      this->fn = 0;
}


static long
iread(input_ty *p, void *data, long len)
{
      input_file_ty     *this;
      long        result;

      if (len < 0)
            return 0;
      this = (input_file_ty *)p;
      result = fread(data, (size_t)1, (size_t)len, this->fp);
      if (result <= 0 && ferror(this->fp))
      {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_errno_set(scp);
            sub_var_set_string(scp, "File_Name", this->fn);
            fatal_intl(scp, i18n("read \"$filename\": $errno"));
            /* NOTREACHED */
      }
      this->pos += result;
      return result;
}


static int
get(input_ty *p)
{
      input_file_ty     *this;
      int         c;

      this = (input_file_ty *)p;
      c = getc(this->fp);
      if (c == EOF && ferror(this->fp))
      {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_errno_set(scp);
            sub_var_set_string(scp, "File_Name", this->fn);
            fatal_intl(scp, i18n("read \"$filename\": $errno"));
            /* NOTREACHED */
      }
      if (c != EOF)
            this->pos++;
      return c;
}


static long
itell(input_ty *p)
{
      input_file_ty     *this;

      this = (input_file_ty *)p;
      return this->pos;
}


static const char *
name(input_ty *p)
{
      input_file_ty     *this;

      this = (input_file_ty *)p;
      return this->fn->str_text;
}


static long
length(input_ty *p)
{
      input_file_ty     *this;
      struct stat st;
      int         err;

      this = (input_file_ty *)p;
#ifdef S_IFLNK
      err = lstat(this->fn->str_text, &st);
#else
      err = stat(this->fn->str_text, &st);
#endif
      if (err < 0)
      {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_errno_set(scp);
            sub_var_set_string(scp, "File_Name", this->fn);
            fatal_intl(scp, i18n("stat \"$filename\": $errno"));
            /* NOTREACHED */
      }
      return st.st_size;
}


static input_vtbl_ty vtbl =
{
      sizeof(input_file_ty),
      destruct,
      iread,
      get,
      itell,
      name,
      length,
};


input_ty *
input_file_open(const char *fn)
{
      input_ty    *result;
      input_file_ty     *this;

      if (!fn || !*fn)
            return input_stdin();
      result = input_new(&vtbl);
      this = (input_file_ty *)result;
      this->fp = fopen_and_check(fn, "rb");
      this->fn = str_from_c(fn);
      this->unlink_on_close = 0;
      this->pos = 0;
      return result;
}


void
input_file_unlink_on_close(input_ty *fp)
{
      input_file_ty     *this;

      if (fp->vptr != &vtbl)
            return;
      this = (input_file_ty *)fp;
      this->unlink_on_close = 1;
}

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