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105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/* cat.c - command to show the contents of a file */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2005,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/file.h>
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#include <grub/disk.h>
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#include <grub/term.h>
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#include <grub/misc.h>
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#include <grub/extcmd.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static const struct grub_arg_option options[] =
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{
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{"dos", -1, 0, N_("Accept DOS-style CR/NL line endings."), 0, 0},
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{0, 0, 0, 0, 0, 0}
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};
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static grub_err_t
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grub_cmd_cat (grub_extcmd_context_t ctxt, int argc, char **args)
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{
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struct grub_arg_list *state = ctxt->state;
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int dos = 0;
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grub_file_t file;
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char buf[GRUB_DISK_SECTOR_SIZE];
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grub_ssize_t size;
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int key = GRUB_TERM_NO_KEY;
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if (state[0].set)
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dos = 1;
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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file = grub_file_open (args[0]);
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if (! file)
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return grub_errno;
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while ((size = grub_file_read (file, buf, sizeof (buf))) > 0
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&& key != GRUB_TERM_ESC)
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{
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int i;
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for (i = 0; i < size; i++)
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{
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unsigned char c = buf[i];
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if ((grub_isprint (c) || grub_isspace (c)) && c != '\r')
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grub_printf ("%c", c);
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else if (dos && c == '\r' && i + 1 < size && buf[i + 1] == '\n')
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{
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grub_printf ("\n");
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i++;
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}
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else
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{
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grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
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grub_printf ("<%x>", (int) c);
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grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
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}
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}
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do
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key = grub_getkey_noblock ();
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while (key != GRUB_TERM_ESC && key != GRUB_TERM_NO_KEY);
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}
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grub_xputs ("\n");
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grub_refresh ();
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grub_file_close (file);
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return 0;
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}
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static grub_extcmd_t cmd;
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GRUB_MOD_INIT(cat)
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{
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cmd = grub_register_extcmd ("cat", grub_cmd_cat, 0,
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N_("FILE"), N_("Show the contents of a file."),
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options);
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}
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GRUB_MOD_FINI(cat)
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{
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grub_unregister_extcmd (cmd);
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}
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