df.c 源码

 

http://www.koders.com/c/fid9C541A435B215354EA5310CDAE1382D4655E961D.aspx

 /* vi: set sw=4 ts=4: *//** Mini df implementation for busybox** Copyright (C) 1999,2000 by Lineo, inc.* Written by Erik Andersen <[e-mail]>, <[e-mail]>* based on original code by (I think) Bruce Perens <[e-mail]>.** This program is free software; you can redistribute it and/or modify* it under the terms of the GNU General Public License as published by* the Free Software Foundation; either version 2 of the License, or* (at your option) any later version.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU* General Public License for more details.** You should have received a copy of the GNU General Public License* along with this program; if not, write to the Free Software* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA**/#include "internal.h"#include <stdio.h>#include <mntent.h>#include <sys/stat.h>#include <sys/vfs.h>static const char df_usage[] = "df [filesystem ...]\n"#ifndef BB_FEATURE_TRIVIAL_HELP"\nPrint the filesystem space used and space available.\n"#endif;extern const char mtab_file[]; /* Defined in utility.c */static int df(char *device, const char *mountPoint){struct statfs s;long blocks_used;long blocks_percent_used;if (statfs(mountPoint, &s) != 0) {perror(mountPoint);return FALSE;}if (s.f_blocks > 0) {blocks_used = s.f_blocks - s.f_bfree;blocks_percent_used = (long)(blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);if (strcmp(device, "/dev/root") == 0) {/* Adjusts device to be the real root device,* or leaves device alone if it can't find it */find_real_root_device_name( device);}printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",device,(long) (s.f_blocks * (s.f_bsize / 1024.0)),(long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),(long) (s.f_bavail * (s.f_bsize / 1024.0)),blocks_percent_used, mountPoint);}return TRUE;}extern int df_main(int argc, char **argv){printf("%-20s %-14s %s %s %s %s\n", "Filesystem","1k-blocks", "Used", "Available", "Use%", "Mounted on");if (argc > 1) {struct mntent *mountEntry;int status;if (**(argv + 1) == '-') {usage(df_usage);}while (argc > 1) {if ((mountEntry = findMountPoint(argv[1], mtab_file)) == 0) {fprintf(stderr, "%s: can't find mount point.\n", argv[1]);exit(FALSE);}status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);if (status != 0)exit(status);argc--;argv++;}exit(TRUE);} else {FILE *mountTable;struct mntent *mountEntry;mountTable = setmntent(mtab_file, "r");if (mountTable == 0) {perror(mtab_file);exit(FALSE);}while ((mountEntry = getmntent(mountTable))) {df(mountEntry->mnt_fsname, mountEntry->mnt_dir);}endmntent(mountTable);}return(TRUE);}/*Local Variables:c-file-style: "linux"c-basic-offset: 4tab-width: 4End:*/