blob: a5ee131b5d886fe8e8b1d5b83f84aa78b2e4d347 [file] [log] [blame]
/*
* util.c --- utilities for the debugfs program
*
* Copyright (C) 1993, 1994 Theodore Ts'o. This file may be
* redistributed under the terms of the GNU Public License.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include "debugfs.h"
FILE *open_pager(void)
{
FILE *outfile;
const char *pager = getenv("PAGER");
signal(SIGPIPE, SIG_IGN);
if (pager) {
if (strcmp(pager, "__none__") == 0) {
return stdout;
}
} else
pager = "more";
outfile = popen(pager, "w");
return (outfile ? outfile : stdout);
}
void close_pager(FILE *stream)
{
if (stream && stream != stdout) pclose(stream);
}
/*
* This routine is used whenever a command needs to turn a string into
* an inode.
*/
ext2_ino_t string_to_inode(char *str)
{
ext2_ino_t ino;
int len = strlen(str);
char *end;
int retval;
/*
* If the string is of the form <ino>, then treat it as an
* inode number.
*/
if ((len > 2) && (str[0] == '<') && (str[len-1] == '>')) {
ino = strtoul(str+1, &end, 0);
if (*end=='>')
return ino;
}
retval = ext2fs_namei(current_fs, root, cwd, str, &ino);
if (retval) {
com_err(str, retval, "");
return 0;
}
return ino;
}
/*
* This routine returns 1 if the filesystem is not open, and prints an
* error message to that effect.
*/
int check_fs_open(char *name)
{
if (!current_fs) {
com_err(name, 0, "Filesystem not open");
return 1;
}
return 0;
}
/*
* This routine returns 1 if a filesystem is open, and prints an
* error message to that effect.
*/
int check_fs_not_open(char *name)
{
if (current_fs) {
com_err(name, 0,
"Filesystem %s is still open. Close it first.\n",
current_fs->device_name);
return 1;
}
return 0;
}
/*
* This routine returns 1 if a filesystem is not opened read/write,
* and prints an error message to that effect.
*/
int check_fs_read_write(char *name)
{
if (!(current_fs->flags & EXT2_FLAG_RW)) {
com_err(name, 0, "Filesystem opened read/only");
return 1;
}
return 0;
}
/*
* This routine returns 1 if a filesystem is doesn't have its inode
* and block bitmaps loaded, and prints an error message to that
* effect.
*/
int check_fs_bitmaps(char *name)
{
if (!current_fs->block_map || !current_fs->inode_map) {
com_err(name, 0, "Filesystem bitmaps not loaded");
return 1;
}
return 0;
}
/*
* This function takes a __u32 time value and converts it to a string,
* using ctime
*/
char *time_to_string(__u32 cl)
{
time_t t = (time_t) cl;
return ctime(&t);
}
/*
* This function will convert a string to an unsigned long, printing
* an error message if it fails, and returning success or failure in err.
*/
unsigned long parse_ulong(const char *str, const char *cmd,
const char *descr, int *err)
{
char *tmp;
unsigned long ret;
ret = strtoul(str, &tmp, 0);
if (*tmp == 0) {
if (err)
*err = 0;
return ret;
}
com_err(cmd, 0, "Bad %s - %s", descr, str);
if (err)
*err = 1;
else
exit(1);
return 0;
}
/*
* This function will convert a string to a block number. It returns
* 0 on success, 1 on failure.
*/
int strtoblk(const char *cmd, const char *str, blk_t *ret)
{
blk_t blk;
int err;
blk = parse_ulong(str, cmd, "block number", &err);
*ret = blk;
if (err == 0 && blk == 0) {
com_err(cmd, 0, "Invalid block number 0");
err = 1;
}
return err;
}
/*
* This is a common helper function used by the command processing
* routines
*/
int common_args_process(int argc, char *argv[], int min_argc, int max_argc,
const char *cmd, const char *usage, int flags)
{
if (argc < min_argc || argc > max_argc) {
com_err(argv[0], 0, "Usage: %s %s", cmd, usage);
return 1;
}
if (flags & CHECK_FS_NOTOPEN) {
if (check_fs_not_open(argv[0]))
return 1;
} else {
if (check_fs_open(argv[0]))
return 1;
}
if ((flags & CHECK_FS_RW) && check_fs_read_write(argv[0]))
return 1;
if ((flags & CHECK_FS_BITMAPS) && check_fs_bitmaps(argv[0]))
return 1;
return 0;
}
/*
* This is a helper function used by do_stat, do_freei, do_seti, and
* do_testi, etc. Basically, any command which takes a single
* argument which is a file/inode number specifier.
*/
int common_inode_args_process(int argc, char *argv[],
ext2_ino_t *inode, int flags)
{
if (common_args_process(argc, argv, 2, 2, argv[0], "<file>", flags))
return 1;
*inode = string_to_inode(argv[1]);
if (!*inode)
return 1;
return 0;
}
/*
* This is a helper function used by do_freeb, do_setb, and do_testb
*/
int common_block_args_process(int argc, char *argv[],
blk_t *block, int *count)
{
int err;
if (common_args_process(argc, argv, 2, 3, argv[0],
"<block> [count]", CHECK_FS_BITMAPS))
return 1;
if (strtoblk(argv[0], argv[1], block))
return 1;
if (argc > 2) {
*count = parse_ulong(argv[2], argv[0], "count", &err);
if (err)
return 1;
}
return 0;
}
int debugfs_read_inode(ext2_ino_t ino, struct ext2_inode * inode,
const char *cmd)
{
int retval;
retval = ext2fs_read_inode(current_fs, ino, inode);
if (retval) {
com_err(cmd, retval, "while reading inode %u", ino);
return 1;
}
return 0;
}
int debugfs_write_inode(ext2_ino_t ino, struct ext2_inode * inode,
const char *cmd)
{
int retval;
retval = ext2fs_write_inode(current_fs, ino, inode);
if (retval) {
com_err(cmd, retval, "while writing inode %u", ino);
return 1;
}
return 0;
}