511 lines
10 KiB
C
511 lines
10 KiB
C
/* completion.c - complete a command, a disk, a partition or a file */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009 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/normal.h>
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#include <grub/misc.h>
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#include <grub/err.h>
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#include <grub/mm.h>
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#include <grub/partition.h>
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#include <grub/disk.h>
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#include <grub/file.h>
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#include <grub/parser.h>
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#include <grub/extcmd.h>
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/* The current word. */
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static char *current_word;
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/* The matched string. */
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static char *match;
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/* The count of candidates. */
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static int num_found;
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/* The string to be appended. */
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static const char *suffix;
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/* The callback function to print items. */
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static void (*print_func) (const char *, grub_completion_type_t, int);
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/* The state the command line is in. */
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static grub_parser_state_t cmdline_state;
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/* Add a string to the list of possible completions. COMPLETION is the
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string that should be added. EXTRA will be appended if COMPLETION
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matches uniquely. The type TYPE specifies what kind of data is added. */
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static int
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add_completion (const char *completion, const char *extra,
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grub_completion_type_t type)
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{
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if (grub_strncmp (current_word, completion, grub_strlen (current_word)) == 0)
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{
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num_found++;
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switch (num_found)
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{
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case 1:
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match = grub_strdup (completion);
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if (! match)
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return 1;
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suffix = extra;
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break;
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case 2:
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if (print_func)
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print_func (match, type, 0);
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/* Fall through. */
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default:
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{
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char *s = match;
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const char *t = completion;
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if (print_func)
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print_func (completion, type, num_found - 1);
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/* Detect the matched portion. */
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while (*s && *t && *s == *t)
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{
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s++;
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t++;
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}
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*s = '\0';
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}
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break;
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}
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}
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return 0;
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}
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static int
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iterate_partition (grub_disk_t disk, const grub_partition_t p)
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{
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const char *disk_name = disk->name;
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char *partition_name = grub_partition_get_name (p);
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char *name;
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int ret;
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if (! partition_name)
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return 1;
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name = grub_xasprintf ("%s,%s", disk_name, partition_name);
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grub_free (partition_name);
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if (! name)
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return 1;
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ret = add_completion (name, ")", GRUB_COMPLETION_TYPE_PARTITION);
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grub_free (name);
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return ret;
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}
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static int
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iterate_dir (const char *filename, const struct grub_dirhook_info *info)
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{
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if (! info->dir)
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{
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const char *prefix;
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if (cmdline_state == GRUB_PARSER_STATE_DQUOTE)
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prefix = "\" ";
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else if (cmdline_state == GRUB_PARSER_STATE_QUOTE)
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prefix = "\' ";
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else
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prefix = " ";
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if (add_completion (filename, prefix, GRUB_COMPLETION_TYPE_FILE))
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return 1;
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}
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else if (grub_strcmp (filename, ".") && grub_strcmp (filename, ".."))
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{
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char *fname;
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fname = grub_xasprintf ("%s/", filename);
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if (add_completion (fname, "", GRUB_COMPLETION_TYPE_FILE))
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{
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grub_free (fname);
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return 1;
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}
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grub_free (fname);
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}
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return 0;
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}
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static int
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iterate_dev (const char *devname)
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{
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grub_device_t dev;
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/* Complete the partition part. */
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dev = grub_device_open (devname);
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if (dev)
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{
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if (dev->disk && dev->disk->has_partitions)
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{
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if (add_completion (devname, ",", GRUB_COMPLETION_TYPE_DEVICE))
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return 1;
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}
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else
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{
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if (add_completion (devname, ")", GRUB_COMPLETION_TYPE_DEVICE))
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return 1;
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}
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}
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grub_errno = GRUB_ERR_NONE;
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return 0;
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}
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/* Complete a device. */
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static int
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complete_device (void)
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{
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/* Check if this is a device or a partition. */
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char *p = grub_strchr (++current_word, ',');
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grub_device_t dev;
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if (! p)
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{
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/* Complete the disk part. */
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if (grub_disk_dev_iterate (iterate_dev))
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return 1;
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}
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else
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{
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/* Complete the partition part. */
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*p = '\0';
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dev = grub_device_open (current_word);
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*p = ',';
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grub_errno = GRUB_ERR_NONE;
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if (dev)
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{
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if (dev->disk && dev->disk->has_partitions)
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{
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if (grub_partition_iterate (dev->disk, iterate_partition))
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{
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grub_device_close (dev);
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return 1;
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}
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}
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grub_device_close (dev);
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}
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else
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return 1;
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}
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return 0;
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}
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/* Complete a file. */
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static int
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complete_file (void)
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{
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char *device;
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char *dir;
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char *last_dir;
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grub_fs_t fs;
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grub_device_t dev;
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int ret = 0;
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device = grub_file_get_device_name (current_word);
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if (grub_errno != GRUB_ERR_NONE)
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return 1;
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dev = grub_device_open (device);
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if (! dev)
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{
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ret = 1;
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goto fail;
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}
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fs = grub_fs_probe (dev);
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if (! fs)
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{
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ret = 1;
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goto fail;
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}
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dir = grub_strchr (current_word + (device ? 2 + grub_strlen (device) : 0),
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'/');
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last_dir = grub_strrchr (current_word, '/');
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if (dir)
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{
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char *dirfile;
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current_word = last_dir + 1;
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dir = grub_strdup (dir);
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if (! dir)
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{
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ret = 1;
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goto fail;
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}
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/* Cut away the filename part. */
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dirfile = grub_strrchr (dir, '/');
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dirfile[1] = '\0';
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/* Iterate the directory. */
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(fs->dir) (dev, dir, iterate_dir);
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grub_free (dir);
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if (grub_errno)
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{
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ret = 1;
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goto fail;
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}
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}
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else
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{
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current_word += grub_strlen (current_word);
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match = grub_strdup ("/");
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if (! match)
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{
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ret = 1;
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goto fail;
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}
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suffix = "";
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num_found = 1;
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}
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fail:
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if (dev)
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grub_device_close (dev);
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grub_free (device);
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return ret;
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}
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/* Complete an argument. */
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static int
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complete_arguments (char *command)
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{
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grub_command_t cmd;
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grub_extcmd_t ext;
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const struct grub_arg_option *option;
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char shortarg[] = "- ";
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cmd = grub_command_find (command);
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if (!cmd || !(cmd->flags & GRUB_COMMAND_FLAG_EXTCMD))
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return 0;
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ext = cmd->data;
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if (!ext->options)
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return 0;
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if (add_completion ("-u", " ", GRUB_COMPLETION_TYPE_ARGUMENT))
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return 1;
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/* Add the short arguments. */
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for (option = ext->options; option->doc; option++)
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{
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if (! option->shortarg)
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continue;
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shortarg[1] = option->shortarg;
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if (add_completion (shortarg, " ", GRUB_COMPLETION_TYPE_ARGUMENT))
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return 1;
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}
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/* First add the built-in arguments. */
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if (add_completion ("--help", " ", GRUB_COMPLETION_TYPE_ARGUMENT))
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return 1;
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if (add_completion ("--usage", " ", GRUB_COMPLETION_TYPE_ARGUMENT))
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return 1;
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/* Add the long arguments. */
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for (option = ext->options; option->doc; option++)
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{
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char *longarg;
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if (!option->longarg)
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continue;
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longarg = grub_xasprintf ("--%s", option->longarg);
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if (!longarg)
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return 1;
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if (add_completion (longarg, " ", GRUB_COMPLETION_TYPE_ARGUMENT))
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{
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grub_free (longarg);
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return 1;
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}
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grub_free (longarg);
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}
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return 0;
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}
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static grub_parser_state_t
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get_state (const char *cmdline)
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{
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grub_parser_state_t state = GRUB_PARSER_STATE_TEXT;
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char use;
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while (*cmdline)
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state = grub_parser_cmdline_state (state, *(cmdline++), &use);
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return state;
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}
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/* Try to complete the string in BUF. Return the characters that
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should be added to the string. This command outputs the possible
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completions by calling HOOK, in that case set RESTORE to 1 so the
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caller can restore the prompt. */
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char *
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grub_normal_do_completion (char *buf, int *restore,
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void (*hook) (const char *, grub_completion_type_t, int))
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{
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int argc;
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char **argv;
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/* Initialize variables. */
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match = 0;
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num_found = 0;
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suffix = "";
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print_func = hook;
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*restore = 1;
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if (grub_parser_split_cmdline (buf, 0, &argc, &argv))
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return 0;
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if (argc == 0)
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current_word = "";
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else
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current_word = argv[argc - 1];
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if (argc > 1 && ! grub_strcmp (argv[0], "set"))
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{
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char *equals = grub_strchr (current_word, '=');
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if (equals)
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/* Complete the value of the variable. */
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current_word = equals + 1;
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}
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/* Determine the state the command line is in, depending on the
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state, it can be determined how to complete. */
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cmdline_state = get_state (buf);
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if (argc == 1 || argc == 0)
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{
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/* Complete a command. */
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grub_command_t cmd;
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FOR_COMMANDS(cmd)
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{
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if (cmd->prio & GRUB_PRIO_LIST_FLAG_ACTIVE)
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{
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if (cmd->flags & GRUB_COMMAND_FLAG_CMDLINE)
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{
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if (add_completion (cmd->name, " ", GRUB_COMPLETION_TYPE_COMMAND))
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goto fail;
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}
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}
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}
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}
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else if (*current_word == '-')
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{
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if (complete_arguments (buf))
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goto fail;
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}
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else if (*current_word == '(' && ! grub_strchr (current_word, ')'))
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{
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/* Complete a device. */
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if (complete_device ())
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goto fail;
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}
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else
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{
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/* Complete a file. */
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if (complete_file ())
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goto fail;
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}
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/* If more than one match is found those matches will be printed and
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the prompt should be restored. */
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if (num_found > 1)
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*restore = 1;
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else
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*restore = 0;
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/* Return the part that matches. */
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if (match)
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{
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char *ret;
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char *escstr;
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char *newstr;
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int current_len;
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int match_len;
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int spaces = 0;
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current_len = grub_strlen (current_word);
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match_len = grub_strlen (match);
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/* Count the number of spaces that have to be escaped. XXX:
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More than just spaces have to be escaped. */
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for (escstr = match + current_len; *escstr; escstr++)
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if (*escstr == ' ')
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spaces++;
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ret = grub_malloc (match_len - current_len + grub_strlen (suffix) + spaces + 1);
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newstr = ret;
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for (escstr = match + current_len; *escstr; escstr++)
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{
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if (*escstr == ' ' && cmdline_state != GRUB_PARSER_STATE_QUOTE
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&& cmdline_state != GRUB_PARSER_STATE_QUOTE)
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*(newstr++) = '\\';
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*(newstr++) = *escstr;
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}
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*newstr = '\0';
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if (num_found == 1)
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grub_strcat (ret, suffix);
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if (*ret == '\0')
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{
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grub_free (ret);
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goto fail;
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}
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if (argc != 0)
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grub_free (argv[0]);
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grub_free (match);
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return ret;
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}
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fail:
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if (argc != 0)
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{
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grub_free (argv[0]);
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grub_free (argv);
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}
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grub_free (match);
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grub_errno = GRUB_ERR_NONE;
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return 0;
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}
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