gio/gio-tool-cat.c

   1 /*
   2  * Copyright 2015 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the licence, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Author: Matthias Clasen <mclasen@redhat.com>
  18  */
  19
  20 #include "config.h"
  21
  22 #include <gio/gio.h>
  23 #include <gi18n.h>
  24 #include <errno.h>
  25
  26 #ifdef G_OS_WIN32
  27 #include <io.h>
  28 #endif
  29
  30 #ifndef STDOUT_FILENO
  31 #define STDOUT_FILENO 1
  32 #endif
  33
  34 #ifdef HAVE_UNISTD_H
  35 #include <unistd.h>
  36 #endif
  37
  38 #include "gio-tool.h"
  39
  40
  41 static const GOptionEntry entries[] = {
  42   { NULL }
  43 };
  44
  45 static gboolean
  46 cat (GFile *file)
  47 {
  48   GInputStream *in;
  49   char buffer[1024 * 8 + 1];
  50   char *p;
  51   gssize res;
  52   gboolean close_res;
  53   GError *error;
  54   gboolean success;
  55
  56   error = NULL;
  57   in = (GInputStream *) g_file_read (file, NULL, &error);
  58   if (in == NULL)
  59     {
  60       print_file_error (file, error->message);
  61       g_error_free (error);
  62       return FALSE;
  63     }
  64
  65   success = TRUE;
  66   while (1)
  67     {
  68       res = g_input_stream_read (in, buffer, sizeof (buffer) - 1, NULL, &error);
  69       if (res > 0)
  70         {
  71           gssize written;
  72
  73           p = buffer;
  74           while (res > 0)
  75             {
  76               written = write (STDOUT_FILENO, p, res);
  77
  78               if (written == -1 && errno != EINTR)
  79                 {
  80                   print_file_error (file, "error writing to stdout");
  81                   success = FALSE;
  82                   goto out;
  83                 }
  84               res -= written;
  85               p += written;
  86             }
  87         }
  88       else if (res < 0)
  89         {
  90           print_file_error (file, error->message);
  91           g_error_free (error);
  92           error = NULL;
  93           success = FALSE;
  94           break;
  95         }
  96       else if (res == 0)
  97         break;
  98     }
  99
 100  out:
 101  close_res = g_input_stream_close (in, NULL, &error);
 102   if (!close_res)
 103     {
 104       print_file_error (file, error->message);
 105       g_error_free (error);
 106       success = FALSE;
 107     }
 108
 109   return success;
 110 }
 111
 112 int
 113 handle_cat (int argc, char *argv[], gboolean do_help)
 114 {
 115   GOptionContext *context;
 116   gchar *param;
 117   GError *error = NULL;
 118   int i;
 119   gboolean res;
 120   GFile *file;
 121
 122   g_set_prgname ("gio cat");
 123   /* Translators: commandline placeholder */
 124   param = g_strdup_printf ("%s...", _("LOCATION"));
 125   context = g_option_context_new (param);
 126   g_free (param);
 127   g_option_context_set_help_enabled (context, FALSE);
 128   g_option_context_set_summary (context,
 129       _("Concatenate files and print to standard output."));
 130   g_option_context_set_description (context,
 131       _("gio cat works just like the traditional cat utility, but using GIO\n"
 132         "locations instead of local files: for example, you can use something\n"
 133         "like smb://server/resource/file.txt as location."));
 134   g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);
 135
 136   if (do_help)
 137     {
 138       show_help (context, NULL);
 139       return 0;
 140     }
 141
 142   if (!g_option_context_parse (context, &argc, &argv, &error))
 143     {
 144       show_help (context, error->message);
 145       g_error_free (error);
 146       return 1;
 147     }
 148
 149   if (argc < 2)
 150     {
 151       show_help (context, _("No files given"));
 152       return 1;
 153     }
 154
 155   g_option_context_free (context);
 156
 157   res = TRUE;
 158   for (i = 1; i < argc; i++)
 159     {
 160       file = g_file_new_for_commandline_arg (argv[i]);
 161       res &= cat (file);
 162       g_object_unref (file);
 163     }
 164
 165   return res ? 0 : 2;
 166 }