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93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/* main.c - the normal mode main routine */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000,2001,2002,2003,2005,2006,2007,2008,2009,2013 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/kernel.h>
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#include <grub/normal.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/term.h>
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#include <grub/env.h>
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#include <grub/parser.h>
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#include <grub/reader.h>
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#include <grub/menu_viewer.h>
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#include <grub/auth.h>
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#include <grub/i18n.h>
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#include <grub/charset.h>
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#include <grub/script_sh.h>
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/* Read a line from the file FILE. */
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char *
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grub_file_getline (grub_file_t file)
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{
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char c;
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grub_size_t pos = 0;
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char *cmdline;
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int have_newline = 0;
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grub_size_t max_len = 64;
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/* Initially locate some space. */
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cmdline = grub_malloc (max_len);
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if (! cmdline)
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return 0;
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while (1)
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{
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if (grub_file_read (file, &c, 1) != 1)
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break;
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/* Skip all carriage returns. */
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if (c == '\r')
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continue;
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if (pos + 1 >= max_len)
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{
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char *old_cmdline = cmdline;
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max_len = max_len * 2;
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cmdline = grub_realloc (cmdline, max_len);
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if (! cmdline)
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{
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grub_free (old_cmdline);
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return 0;
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}
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}
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if (c == '\n')
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{
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have_newline = 1;
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break;
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}
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cmdline[pos++] = c;
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}
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cmdline[pos] = '\0';
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/* If the buffer is empty, don't return anything at all. */
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if (pos == 0 && !have_newline)
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{
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grub_free (cmdline);
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cmdline = 0;
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}
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return cmdline;
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}
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