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Sourcecode: dctrl-tools version File versions

misc.c

/*  dctrl-tools - Debian control file inspection tools
    Copyright (C) 2004 Antti-Juhani Kaijanaho

    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  02111-1307  USA
 */

#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "misc.h"
#include "msg.h"

int to_stdout (const char * fname)
{
      FILE * f;
      FILE * t = stdout;
      bool pipe = false;
      int c;
      int rv = 1;

      if (isatty(STDOUT_FILENO)) {
            char * cmd = getenv("PAGER");
            if (cmd == 0) cmd = "/usr/bin/pager";
            if (do_msg(L_INFORMATIONAL)) {
                  fprintf(stderr, _("%s: using `%s' as pager\n"),
                        get_progname(), cmd);
            }
            // popen does not set errno if memory allocation fails
            errno = ENOMEM;
            FILE * p = popen(cmd, "w");
            if (p != 0) {
                  t = p;
                  pipe = true;
            } else if (do_msg(L_IMPORTANT)) {
                  fprintf(stderr, _("%s: popen failed for %s: %s\n"),
                        get_progname(), cmd, strerror(errno));
            }
      }

      f = fopen (fname, "r");
      if (f == 0) {
            message (L_FATAL, strerror (errno), COPYING);
            return 0;
      }

      while ( ( c = getc (f)) != EOF) putc(c, t);

      if (ferror (f)) {
            message (L_FATAL, strerror (errno), COPYING);
            rv = 0;
      }

      fclose (f);

      if (pipe) pclose(t);

      return rv;
}


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