minor cleanup

[oweals/busybox.git] / utility.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) tons of folks.  Tracking down who wrote what
 * isn't something I'm going to worry about...  If you wrote something
 * here, please feel free to acknowledge your work.
 *
 * 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
 *
 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell 
 * Permission has been granted to redistribute this code under the GPL.
 *
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <time.h>
#include <utime.h>
#include <unistd.h>
#include <ctype.h>
#include <stdlib.h>
#include <limits.h>
#include <stdarg.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>                /* for uname(2) */

#include "busybox.h"
#if defined (BB_CHMOD_CHOWN_CHGRP) \
 || defined (BB_CP_MV)             \
 || defined (BB_FIND)              \
 || defined (BB_INSMOD)            \
 || defined (BB_LS)                \
 || defined (BB_RM)                \
 || defined (BB_TAR)
/* same conditions as recursive_action */
#define bb_need_name_too_long
#endif
#define bb_need_memory_exhausted
#define bb_need_full_version
#define BB_DECLARE_EXTERN
#include "messages.c"

#include "pwd_grp/pwd.h"
#include "pwd_grp/grp.h"

/* for the _syscall() macros */
#include <sys/syscall.h>
#include <linux/unistd.h>

/* Busybox mount uses either /proc/mounts or /dev/mtab to 
 * get the list of currently mounted filesystems */ 
#if defined BB_MOUNT || defined BB_UMOUNT || defined BB_DF
#  if defined BB_MTAB
const char mtab_file[] = "/etc/mtab";
#  else
#      if defined BB_FEATURE_USE_DEVPS_PATCH
const char mtab_file[] = "/dev/mtab";
#    else
const char mtab_file[] = "/proc/mounts";
#    endif
#  endif
#endif

static struct BB_applet *applet_using;

extern void show_usage(void)
{
        const char *format_string;
        const char *usage_string = usage_messages;
        int i;

        for (i = applet_using - applets; i > 0; ) {
                if (!*usage_string++) {
                        --i;
                }
        }
        format_string = "%s\n\nUsage: %s %s\n\n";
        if(*usage_string == 0)
                format_string = "%s\n\nNo help available.\n\n";
        fprintf(stderr, format_string,
                        full_version, applet_using->name, usage_string);
        exit(EXIT_FAILURE);
}


static void verror_msg(const char *s, va_list p)
{
        fflush(stdout);
        fprintf(stderr, "%s: ", applet_name);
        vfprintf(stderr, s, p);
}

extern void error_msg(const char *s, ...)
{
        va_list p;

        va_start(p, s);
        verror_msg(s, p);
        va_end(p);
        putc('\n', stderr);
}

extern void error_msg_and_die(const char *s, ...)
{
        va_list p;

        va_start(p, s);
        verror_msg(s, p);
        va_end(p);
        putc('\n', stderr);
        exit(EXIT_FAILURE);
}

static void vperror_msg(const char *s, va_list p)
{
        int err=errno;
        if(s == 0) s = "";
        verror_msg(s, p);
        if (*s) s = ": ";
        fprintf(stderr, "%s%s\n", s, strerror(err));
}

extern void perror_msg(const char *s, ...)
{
        va_list p;

        va_start(p, s);
        vperror_msg(s, p);
        va_end(p);
}

extern void perror_msg_and_die(const char *s, ...)
{
        va_list p;

        va_start(p, s);
        vperror_msg(s, p);
        va_end(p);
        exit(EXIT_FAILURE);
}

#if defined BB_INIT || defined BB_MKSWAP || defined BB_MOUNT || defined BB_NFSMOUNT
/* Returns kernel version encoded as major*65536 + minor*256 + patch,
 * so, for example,  to check if the kernel is greater than 2.2.11:
 *     if (get_kernel_revision() <= 2*65536+2*256+11) { <stuff> }
 */
extern int get_kernel_revision(void)
{
        struct utsname name;
        char *s;
        int i, r;

        if (uname(&name) == -1) {
                perror_msg("cannot get system information");
                return (0);
        }

        s = name.release;
        r = 0;
        for (i=0 ; i<3 ; i++) {
                r = r * 256 + atoi(strtok(s, "."));
                s = NULL;
        }
        return r;
}
#endif                                                 /* BB_INIT */



#if defined BB_FREE || defined BB_INIT || defined BB_UNAME || defined BB_UPTIME
_syscall1(int, sysinfo, struct sysinfo *, info);
#endif                                                 /* BB_INIT */

#if defined BB_MOUNT || defined BB_UMOUNT

/* Include our own version of <sys/mount.h>, since libc5 doesn't
 * know about umount2 */
extern _syscall1(int, umount, const char *, special_file);
extern _syscall5(int, mount, const char *, special_file, const char *, dir,
                const char *, fstype, unsigned long int, rwflag, const void *, data);
#ifndef __NR_umount2
# warning This kernel does not support the umount2 syscall
# warning The umount2 system call is being stubbed out...
        int umount2(const char * special_file, int flags)
        {
                /* BusyBox was compiled against a kernel that did not support
                 *  the umount2 system call.  To make this application work,
                 *  you will need to recompile with a kernel supporting the
                 *  umount2 system call.
                 */
                fprintf(stderr, "\n\nTo make this application work, you will need to recompile\n");
                fprintf(stderr, "with a kernel supporting the umount2 system call. -Erik\n\n");
                errno=ENOSYS;
                return -1;
        }
# else
   extern _syscall2(int, umount2, const char *, special_file, int, flags);
# endif
#endif



#if defined BB_FEATURE_NEW_MODULE_INTERFACE && ( defined BB_INSMOD || defined BB_LSMOD )
#ifndef __NR_query_module
static const int __NR_query_module = 167;
#endif
_syscall5(int, query_module, const char *, name, int, which,
                void *, buf, size_t, bufsize, size_t*, ret);
#endif


#if defined (BB_CP_MV) || defined (BB_DU)

#define HASH_SIZE       311             /* Should be prime */
#define hash_inode(i)   ((i) % HASH_SIZE)

static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];

/*
 * Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
 * `ino_dev_hashtable', else return 0
 *
 * If NAME is a non-NULL pointer to a character pointer, and there is
 * a match, then set *NAME to the value of the name slot in that
 * bucket.
 */
int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
{
        ino_dev_hashtable_bucket_t *bucket;

        bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
        while (bucket != NULL) {
          if ((bucket->ino == statbuf->st_ino) &&
                  (bucket->dev == statbuf->st_dev))
          {
                if (name) *name = bucket->name;
                return 1;
          }
          bucket = bucket->next;
        }
        return 0;
}

/* Add statbuf to statbuf hash table */
void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
{
        int i;
        size_t s;
        ino_dev_hashtable_bucket_t *bucket;
    
        i = hash_inode(statbuf->st_ino);
        s = name ? strlen(name) : 0;
        bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
        bucket->ino = statbuf->st_ino;
        bucket->dev = statbuf->st_dev;
        if (name)
                strcpy(bucket->name, name);
        else
                bucket->name[0] = '\0';
        bucket->next = ino_dev_hashtable[i];
        ino_dev_hashtable[i] = bucket;
}

/* Clear statbuf hash table */
void reset_ino_dev_hashtable(void)
{
        int i;
        ino_dev_hashtable_bucket_t *bucket;

        for (i = 0; i < HASH_SIZE; i++) {
                while (ino_dev_hashtable[i] != NULL) {
                        bucket = ino_dev_hashtable[i]->next;
                        free(ino_dev_hashtable[i]);
                        ino_dev_hashtable[i] = bucket;
                }
        }
}

#endif /* BB_CP_MV || BB_DU */

#if defined (BB_CP_MV) || defined (BB_DU) || defined (BB_LN) || defined (BB_DPKG_DEB)
/*
 * Return TRUE if a fileName is a directory.
 * Nonexistant files return FALSE.
 */
int is_directory(const char *fileName, const int followLinks, struct stat *statBuf)
{
        int status;
        int didMalloc = 0;

        if (statBuf == NULL) {
            statBuf = (struct stat *)xmalloc(sizeof(struct stat));
            ++didMalloc;
        }

        if (followLinks == TRUE)
                status = stat(fileName, statBuf);
        else
                status = lstat(fileName, statBuf);

        if (status < 0 || !(S_ISDIR(statBuf->st_mode))) {
            status = FALSE;
        }
        else status = TRUE;

        if (didMalloc) {
            free(statBuf);
            statBuf = NULL;
        }
        return status;
}
#endif

#if defined BB_AR || defined BB_CP_MV
/*
 * Copy chunksize bytes between two file descriptors
 */
int copy_file_chunk(int srcfd, int dstfd, size_t chunksize)
{
        size_t size;
        char buffer[BUFSIZ]; /* BUFSIZ is declared in stdio.h */

        while (chunksize > 0) {
                if (chunksize > BUFSIZ)
                        size = BUFSIZ;
                else
                        size = chunksize;
                if (full_write(dstfd, buffer, full_read(srcfd, buffer, size)) < size)
                        return(FALSE);
                chunksize -= size;
        }
        return (TRUE);
}
#endif


#if defined (BB_CP_MV) || defined BB_DPKG
/*
 * Copy one file to another, while possibly preserving its modes, times, and
 * modes.  Returns TRUE if successful, or FALSE on a failure with an error
 * message output.  (Failure is not indicated if attributes cannot be set.)
 * -Erik Andersen
 */
int
copy_file(const char *srcName, const char *destName,
                 int setModes, int followLinks, int forceFlag)
{
        int rfd;
        int wfd;
        int status;
        struct stat srcStatBuf;
        struct stat dstStatBuf;
        struct utimbuf times;

        if (followLinks == TRUE)
                status = stat(srcName, &srcStatBuf);
        else
                status = lstat(srcName, &srcStatBuf);

        if (status < 0) {
                perror_msg("%s", srcName);
                return FALSE;
        }

        if (followLinks == TRUE)
                status = stat(destName, &dstStatBuf);
        else
                status = lstat(destName, &dstStatBuf);

        if (status < 0 || forceFlag==TRUE) {
                unlink(destName);
                dstStatBuf.st_ino = -1;
                dstStatBuf.st_dev = -1;
        }

        if ((srcStatBuf.st_dev == dstStatBuf.st_dev) &&
                (srcStatBuf.st_ino == dstStatBuf.st_ino)) {
                error_msg("Copying file \"%s\" to itself", srcName);
                return FALSE;
        }

        if (S_ISDIR(srcStatBuf.st_mode)) {
                //fprintf(stderr, "copying directory %s to %s\n", srcName, destName);
                /* Make sure the directory is writable */
                status = mkdir(destName, 0777777 ^ umask(0));
                if (status < 0 && errno != EEXIST) {
                        perror_msg("%s", destName);
                        return FALSE;
                }
        } else if (S_ISLNK(srcStatBuf.st_mode)) {
                char link_val[BUFSIZ + 1];
                int link_size;

                //fprintf(stderr, "copying link %s to %s\n", srcName, destName);
                /* Warning: This could possibly truncate silently, to BUFSIZ chars */
                link_size = readlink(srcName, &link_val[0], BUFSIZ);
                if (link_size < 0) {
                        perror_msg("%s", srcName);
                        return FALSE;
                }
                link_val[link_size] = '\0';
                status = symlink(link_val, destName);
                if (status < 0) {
                        perror_msg("%s", destName);
                        return FALSE;
                }
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
                if (setModes == TRUE) {
                        /* Try to set owner, but fail silently like GNU cp */
                        lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
                }
#endif
                return TRUE;
        } else if (S_ISFIFO(srcStatBuf.st_mode)) {
                //fprintf(stderr, "copying fifo %s to %s\n", srcName, destName);
                if (mkfifo(destName, 0644) < 0) {
                        perror_msg("%s", destName);
                        return FALSE;
                }
        } else if (S_ISBLK(srcStatBuf.st_mode) || S_ISCHR(srcStatBuf.st_mode)
                           || S_ISSOCK(srcStatBuf.st_mode)) {
                //fprintf(stderr, "copying soc, blk, or chr %s to %s\n", srcName, destName);
                if (mknod(destName, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) {
                        perror_msg("%s", destName);
                        return FALSE;
                }
        } else if (S_ISREG(srcStatBuf.st_mode)) {
                //fprintf(stderr, "copying regular file %s to %s\n", srcName, destName);
                rfd = open(srcName, O_RDONLY);
                if (rfd < 0) {
                        perror_msg("%s", srcName);
                        return FALSE;
                }

                wfd = open(destName, O_WRONLY | O_CREAT | O_TRUNC,
                                 srcStatBuf.st_mode);
                if (wfd < 0) {
                        perror_msg("%s", destName);
                        close(rfd);
                        return FALSE;
                }

                if (copy_file_chunk(rfd, wfd, srcStatBuf.st_size)==FALSE)
                        goto error_exit;        
                
                close(rfd);
                if (close(wfd) < 0) {
                        return FALSE;
                }
        }

        if (setModes == TRUE) {
                /* This is fine, since symlinks never get here */
                if (chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0)
                        perror_msg_and_die("%s", destName);
                if (chmod(destName, srcStatBuf.st_mode) < 0)
                        perror_msg_and_die("%s", destName);
                times.actime = srcStatBuf.st_atime;
                times.modtime = srcStatBuf.st_mtime;
                if (utime(destName, &times) < 0)
                        perror_msg_and_die("%s", destName);
        }

        return TRUE;

  error_exit:
        perror_msg("%s", destName);
        close(rfd);
        close(wfd);

        return FALSE;
}
#endif                                                  /* BB_CP_MV */



#if defined BB_TAR || defined BB_LS ||defined BB_AR

#define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
#define TYPECHAR(mode)  ("0pcCd?bB-?l?s???" [TYPEINDEX(mode)])

/* The special bits. If set, display SMODE0/1 instead of MODE0/1 */
static const mode_t SBIT[] = {
        0, 0, S_ISUID,
        0, 0, S_ISGID,
        0, 0, S_ISVTX
};

/* The 9 mode bits to test */
static const mode_t MBIT[] = {
        S_IRUSR, S_IWUSR, S_IXUSR,
        S_IRGRP, S_IWGRP, S_IXGRP,
        S_IROTH, S_IWOTH, S_IXOTH
};

static const char MODE1[]  = "rwxrwxrwx";
static const char MODE0[]  = "---------";
static const char SMODE1[] = "..s..s..t";
static const char SMODE0[] = "..S..S..T";

/*
 * Return the standard ls-like mode string from a file mode.
 * This is static and so is overwritten on each call.
 */
const char *mode_string(int mode)
{
        static char buf[12];

        int i;

        buf[0] = TYPECHAR(mode);
        for (i = 0; i < 9; i++) {
                if (mode & SBIT[i])
                        buf[i + 1] = (mode & MBIT[i]) ? SMODE1[i] : SMODE0[i];
                else
                        buf[i + 1] = (mode & MBIT[i]) ? MODE1[i] : MODE0[i];
        }
        return buf;
}
#endif                                                  /* BB_TAR || BB_LS */


#if defined BB_TAR || defined BB_AR
/*
 * Return the standard ls-like time string from a time_t
 * This is static and so is overwritten on each call.
 */
const char *time_string(time_t timeVal)
{
        time_t now;
        char *str;
        static char buf[26];

        time(&now);

        str = ctime(&timeVal);

        strcpy(buf, &str[4]);
        buf[12] = '\0';

        if ((timeVal > now) || (timeVal < now - 365 * 24 * 60 * 60L)) {
                strcpy(&buf[7], &str[20]);
                buf[11] = '\0';
        }

        return buf;
}
#endif /* BB_TAR || BB_AR */

#if defined BB_DD || defined BB_NC || defined BB_TAIL || defined BB_TAR || defined BB_AR || defined BB_CP_MV
/*
 * Write all of the supplied buffer out to a file.
 * This does multiple writes as necessary.
 * Returns the amount written, or -1 on an error.
 */
int full_write(int fd, const char *buf, int len)
{
        int cc;
        int total;

        total = 0;

        while (len > 0) {
                cc = write(fd, buf, len);

                if (cc < 0)
                        return -1;

                buf += cc;
                total += cc;
                len -= cc;
        }

        return total;
}
#endif

#if defined BB_AR || defined BB_CP_MV || defined BB_SH || defined BB_TAR
/*
 * Read all of the supplied buffer from a file.
 * This does multiple reads as necessary.
 * Returns the amount read, or -1 on an error.
 * A short read is returned on an end of file.
 */
int full_read(int fd, char *buf, int len)
{
        int cc;
        int total;

        total = 0;

        while (len > 0) {
                cc = read(fd, buf, len);

                if (cc < 0)
                        return -1;

                if (cc == 0)
                        break;

                buf += cc;
                total += cc;
                len -= cc;
        }

        return total;
}
#endif /* BB_TAR || BB_TAIL || BB_AR || BB_SH */


#if defined (BB_CHMOD_CHOWN_CHGRP) \
 || defined (BB_CP_MV)                  \
 || defined (BB_FIND)                   \
 || defined (BB_INSMOD)                 \
 || defined (BB_LS)                             \
 || defined (BB_RM)                             \
 || defined (BB_TAR)

/*
 * Walk down all the directories under the specified 
 * location, and do something (something specified
 * by the fileAction and dirAction function pointers).
 *
 * Unfortunately, while nftw(3) could replace this and reduce 
 * code size a bit, nftw() wasn't supported before GNU libc 2.1, 
 * and so isn't sufficiently portable to take over since glibc2.1
 * is so stinking huge.
 */
int recursive_action(const char *fileName,
                                        int recurse, int followLinks, int depthFirst,
                                        int (*fileAction) (const char *fileName,
                                                                           struct stat * statbuf,
                                                                           void* userData),
                                        int (*dirAction) (const char *fileName,
                                                                          struct stat * statbuf,
                                                                          void* userData),
                                        void* userData)
{
        int status;
        struct stat statbuf;
        struct dirent *next;

        if (followLinks == TRUE)
                status = stat(fileName, &statbuf);
        else
                status = lstat(fileName, &statbuf);

        if (status < 0) {
#ifdef BB_DEBUG_PRINT_SCAFFOLD
                fprintf(stderr,
                                "status=%d followLinks=%d TRUE=%d\n",
                                status, followLinks, TRUE);
#endif
                perror_msg("%s", fileName);
                return FALSE;
        }

        if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
                if (fileAction == NULL)
                        return TRUE;
                else
                        return fileAction(fileName, &statbuf, userData);
        }

        if (recurse == FALSE) {
                if (S_ISDIR(statbuf.st_mode)) {
                        if (dirAction != NULL)
                                return (dirAction(fileName, &statbuf, userData));
                        else
                                return TRUE;
                }
        }

        if (S_ISDIR(statbuf.st_mode)) {
                DIR *dir;

                if (dirAction != NULL && depthFirst == FALSE) {
                        status = dirAction(fileName, &statbuf, userData);
                        if (status == FALSE) {
                                perror_msg("%s", fileName);
                                return FALSE;
                        } else if (status == SKIP)
                                return TRUE;
                }
                dir = opendir(fileName);
                if (!dir) {
                        perror_msg("%s", fileName);
                        return FALSE;
                }
                while ((next = readdir(dir)) != NULL) {
                        char nextFile[BUFSIZ + 1];

                        if ((strcmp(next->d_name, "..") == 0)
                                || (strcmp(next->d_name, ".") == 0)) {
                                continue;
                        }
                        if (strlen(fileName) + strlen(next->d_name) + 1 > BUFSIZ) {
                                error_msg(name_too_long);
                                return FALSE;
                        }
                        memset(nextFile, 0, sizeof(nextFile));
                        sprintf(nextFile, "%s/%s", fileName, next->d_name);
                        status =
                                recursive_action(nextFile, TRUE, followLinks, depthFirst,
                                                                fileAction, dirAction, userData);
                        if (status == FALSE) {
                                closedir(dir);
                                return FALSE;
                        }
                }
                status = closedir(dir);
                if (status < 0) {
                        perror_msg("%s", fileName);
                        return FALSE;
                }
                if (dirAction != NULL && depthFirst == TRUE) {
                        status = dirAction(fileName, &statbuf, userData);
                        if (status == FALSE) {
                                perror_msg("%s", fileName);
                                return FALSE;
                        }
                }
        } else {
                if (fileAction == NULL)
                        return TRUE;
                else
                        return fileAction(fileName, &statbuf, userData);
        }
        return TRUE;
}

#endif                                                  /* BB_CHMOD_CHOWN_CHGRP || BB_CP_MV || BB_FIND || BB_LS || BB_INSMOD */



#if defined (BB_TAR) || defined (BB_MKDIR)
/*
 * Attempt to create the directories along the specified path, except for
 * the final component.  The mode is given for the final directory only,
 * while all previous ones get default protections.  Errors are not reported
 * here, as failures to restore files can be reported later.
 */
extern int create_path(const char *name, int mode)
{
        char *cp;
        char *cpOld;
        char buf[BUFSIZ + 1];
        int retVal = 0;

        strcpy(buf, name);
        for (cp = buf; *cp == '/'; cp++);
        cp = strchr(cp, '/');
        while (cp) {
                cpOld = cp;
                cp = strchr(cp + 1, '/');
                *cpOld = '\0';
                retVal = mkdir(buf, cp ? 0777 : mode);
                if (retVal != 0 && errno != EEXIST) {
                        perror_msg("%s", buf);
                        return FALSE;
                }
                *cpOld = '/';
        }
        return TRUE;
}
#endif                                                  /* BB_TAR || BB_MKDIR */



#if defined (BB_CHMOD_CHOWN_CHGRP) || defined (BB_MKDIR) \
 || defined (BB_MKFIFO) || defined (BB_MKNOD) || defined (BB_AR)
/* [ugoa]{+|-|=}[rwxst] */

extern int parse_mode(const char *s, mode_t * theMode)
{
        static const mode_t group_set[] = { 
                S_ISUID | S_IRWXU,              /* u */
                S_ISGID | S_IRWXG,              /* g */
                S_IRWXO,                                /* o */
                S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO /* a */
        };

        static const mode_t mode_set[] = {
                S_IRUSR | S_IRGRP | S_IROTH, /* r */
                S_IWUSR | S_IWGRP | S_IWOTH, /* w */
                S_IXUSR | S_IXGRP | S_IXOTH, /* x */
                S_ISUID | S_ISGID,              /* s */
                S_ISVTX                                 /* t */
        };

        static const char group_string[] = "ugoa";
        static const char mode_string[] = "rwxst";

        const char *p;

        mode_t andMode =
                S_ISVTX | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
        mode_t orMode = 0;
        mode_t mode;
        mode_t groups;
        char type;
        char c;

        if (s==NULL) {
                return (FALSE);
        }

        do {
                mode = 0;
                groups = 0;
        NEXT_GROUP:
                if ((c = *s++) == '\0') {
                        return -1;
                }
                for (p=group_string ; *p ; p++) {
                        if (*p == c) {
                                groups |= group_set[(int)(p-group_string)];
                                goto NEXT_GROUP;
                        }
                }
                switch (c) {
                        case '=':
                        case '+':
                        case '-':
                                type = c;
                                if (groups == 0) { /* The default is "all" */
                                        groups |= S_ISUID | S_ISGID | S_ISVTX
                                                        | S_IRWXU | S_IRWXG | S_IRWXO;
                                }
                                break;
                        default:
                                if ((c < '0') || (c > '7') || (mode | groups)) {
                                        return (FALSE);
                                } else {
                                        *theMode = strtol(--s, NULL, 8);
                                        return (TRUE);
                                }
                }

        NEXT_MODE:
                if (((c = *s++) != '\0') && (c != ',')) {
                        for (p=mode_string ; *p ; p++) {
                                if (*p == c) {
                                        mode |= mode_set[(int)(p-mode_string)];
                                        goto NEXT_MODE;
                                }
                        }
                        break;                          /* We're done so break out of loop.*/
                }
                switch (type) {
                        case '=':
                                andMode &= ~(groups); /* Now fall through. */
                        case '+':
                                orMode |= mode & groups;
                                break;
                        case '-':
                                andMode &= ~(mode & groups);
                                orMode &= ~(mode & groups);
                                break;
                }
        } while (c == ',');

        *theMode &= andMode;
        *theMode |= orMode;

        return TRUE;
}

#endif
/* BB_CHMOD_CHOWN_CHGRP || BB_MKDIR || BB_MKFIFO || BB_MKNOD */





#if defined BB_CHMOD_CHOWN_CHGRP || defined BB_PS || defined BB_LS \
 || defined BB_TAR || defined BB_ID || defined BB_LOGGER \
 || defined BB_LOGNAME || defined BB_WHOAMI || defined BB_SH

#if defined BB_CHMOD_CHOWN_CHGRP || defined BB_ID
/* returns a uid given a username */
long my_getpwnam(const char *name)
{
        struct passwd *myuser;

        myuser  = getpwnam(name);
        if (myuser==NULL)
                error_msg_and_die("unknown user name: %s", name);

        return myuser->pw_uid;
}

/* returns a gid given a group name */
long my_getgrnam(const char *name)
{
        struct group *mygroup;

        mygroup  = getgrnam(name);
        if (mygroup==NULL)
                error_msg_and_die("unknown group name: %s", name);

        return (mygroup->gr_gid);
}
#endif

/* gets a username given a uid */
void my_getpwuid(char *name, long uid)
{
        struct passwd *myuser;

        myuser  = getpwuid(uid);
        if (myuser==NULL)
                sprintf(name, "%-8ld ", (long)uid);
        else
                strcpy(name, myuser->pw_name);
}

/* gets a groupname given a gid */
void my_getgrgid(char *group, long gid)
{
        struct group *mygroup;

        mygroup  = getgrgid(gid);
        if (mygroup==NULL)
                sprintf(group, "%-8ld ", (long)gid);
        else
                strcpy(group, mygroup->gr_name);
}

#if defined BB_ID
/* gets a gid given a user name */
long my_getpwnamegid(const char *name)
{
        struct group *mygroup;
        struct passwd *myuser;

        myuser=getpwnam(name);
        if (myuser==NULL)
                error_msg_and_die("unknown user name: %s", name);

        mygroup  = getgrgid(myuser->pw_gid);
        if (mygroup==NULL)
                error_msg_and_die("unknown gid %ld", (long)myuser->pw_gid);

        return mygroup->gr_gid;
}
#endif /* BB_ID */
#endif
 /* BB_CHMOD_CHOWN_CHGRP || BB_PS || BB_LS || BB_TAR \
 || BB_ID || BB_LOGGER || BB_LOGNAME || BB_WHOAMI */


#if (defined BB_CHVT) || (defined BB_DEALLOCVT) || (defined BB_SETKEYCODES)

/* From <linux/kd.h> */ 
static const int KDGKBTYPE = 0x4B33;  /* get keyboard type */
static const int KB_84 = 0x01;
static const int KB_101 = 0x02;    /* this is what we always answer */

int is_a_console(int fd)
{
        char arg;

        arg = 0;
        return (ioctl(fd, KDGKBTYPE, &arg) == 0
                        && ((arg == KB_101) || (arg == KB_84)));
}

static int open_a_console(char *fnam)
{
        int fd;

        /* try read-only */
        fd = open(fnam, O_RDWR);

        /* if failed, try read-only */
        if (fd < 0 && errno == EACCES)
                fd = open(fnam, O_RDONLY);

        /* if failed, try write-only */
        if (fd < 0 && errno == EACCES)
                fd = open(fnam, O_WRONLY);

        /* if failed, fail */
        if (fd < 0)
                return -1;

        /* if not a console, fail */
        if (!is_a_console(fd)) {
                close(fd);
                return -1;
        }

        /* success */
        return fd;
}

/*
 * Get an fd for use with kbd/console ioctls.
 * We try several things because opening /dev/console will fail
 * if someone else used X (which does a chown on /dev/console).
 *
 * if tty_name is non-NULL, try this one instead.
 */

int get_console_fd(char *tty_name)
{
        int fd;

        if (tty_name) {
                if (-1 == (fd = open_a_console(tty_name)))
                        return -1;
                else
                        return fd;
        }

        fd = open_a_console("/dev/tty");
        if (fd >= 0)
                return fd;

        fd = open_a_console("/dev/tty0");
        if (fd >= 0)
                return fd;

        fd = open_a_console("/dev/console");
        if (fd >= 0)
                return fd;

        for (fd = 0; fd < 3; fd++)
                if (is_a_console(fd))
                        return fd;

        error_msg("Couldnt get a file descriptor referring to the console");
        return -1;                                      /* total failure */
}


#endif                                                  /* BB_CHVT || BB_DEALLOCVT || BB_SETKEYCODES */


#if defined BB_FIND || defined BB_INSMOD
/*
 * Routine to see if a text string is matched by a wildcard pattern.
 * Returns TRUE if the text is matched, or FALSE if it is not matched
 * or if the pattern is invalid.
 *  *           matches zero or more characters
 *  ?           matches a single character
 *  [abc]       matches 'a', 'b' or 'c'
 *  \c          quotes character c
 * Adapted from code written by Ingo Wilken, and
 * then taken from sash, Copyright (c) 1999 by David I. Bell
 * Permission is granted to use, distribute, or modify this source,
 * provided that this copyright notice remains intact.
 * Permission to distribute this code under the GPL has been granted.
 */
extern int check_wildcard_match(const char *text, const char *pattern)
{
        const char *retryPat;
        const char *retryText;
        int ch;
        int found;
        int len;

        retryPat = NULL;
        retryText = NULL;

        while (*text || *pattern) {
                ch = *pattern++;

                switch (ch) {
                case '*':
                        retryPat = pattern;
                        retryText = text;
                        break;

                case '[':
                        found = FALSE;

                        while ((ch = *pattern++) != ']') {
                                if (ch == '\\')
                                        ch = *pattern++;

                                if (ch == '\0')
                                        return FALSE;

                                if (*text == ch)
                                        found = TRUE;
                        }
                        len=strlen(text);
                        if (found == FALSE && len!=0) {
                                return FALSE;
                        }
                        if (found == TRUE) {
                                if (strlen(pattern)==0 && len==1) {
                                        return TRUE;
                                }
                                if (len!=0) {
                                        text++;
                                        continue;
                                }
                        }

                        /* fall into next case */

                case '?':
                        if (*text++ == '\0')
                                return FALSE;

                        break;

                case '\\':
                        ch = *pattern++;

                        if (ch == '\0')
                                return FALSE;

                        /* fall into next case */

                default:
                        if (*text == ch) {
                                if (*text)
                                        text++;
                                break;
                        }

                        if (*text) {
                                pattern = retryPat;
                                text = ++retryText;
                                break;
                        }

                        return FALSE;
                }

                if (pattern == NULL)
                        return FALSE;
        }

        return TRUE;
}
#endif                            /* BB_FIND || BB_INSMOD */




#if defined BB_DF || defined BB_MTAB
#include <mntent.h>
/*
 * Given a block device, find the mount table entry if that block device
 * is mounted.
 *
 * Given any other file (or directory), find the mount table entry for its
 * filesystem.
 */
extern struct mntent *find_mount_point(const char *name, const char *table)
{
        struct stat s;
        dev_t mountDevice;
        FILE *mountTable;
        struct mntent *mountEntry;

        if (stat(name, &s) != 0)
                return 0;

        if ((s.st_mode & S_IFMT) == S_IFBLK)
                mountDevice = s.st_rdev;
        else
                mountDevice = s.st_dev;


        if ((mountTable = setmntent(table, "r")) == 0)
                return 0;

        while ((mountEntry = getmntent(mountTable)) != 0) {
                if (strcmp(name, mountEntry->mnt_dir) == 0
                        || strcmp(name, mountEntry->mnt_fsname) == 0)   /* String match. */
                        break;
                if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice)  /* Match the device. */
                        break;
                if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice)      /* Match the directory's mount point. */
                        break;
        }
        endmntent(mountTable);
        return mountEntry;
}
#endif                                                  /* BB_DF || BB_MTAB */

#if defined BB_INIT || defined BB_SYSLOGD 
/* try to open up the specified device */
extern int device_open(char *device, int mode)
{
        int m, f, fd = -1;

        m = mode | O_NONBLOCK;

        /* Retry up to 5 times */
        for (f = 0; f < 5; f++)
                if ((fd = open(device, m, 0600)) >= 0)
                        break;
        if (fd < 0)
                return fd;
        /* Reset original flags. */
        if (m != mode)
                fcntl(fd, F_SETFL, mode);
        return fd;
}
#endif                                                  /* BB_INIT BB_SYSLOGD */


#if defined BB_KILLALL || ( defined BB_FEATURE_LINUXRC && ( defined BB_HALT || defined BB_REBOOT || defined BB_POWEROFF ))
#ifdef BB_FEATURE_USE_DEVPS_PATCH
#include <linux/devps.h> /* For Erik's nifty devps device driver */
#endif

#if defined BB_FEATURE_USE_DEVPS_PATCH
/* find_pid_by_name()
 *  
 *  This finds the pid of the specified process,
 *  by using the /dev/ps device driver.
 *
 *  Returns a list of all matching PIDs
 */
extern pid_t* find_pid_by_name( char* pidName)
{
        int fd, i, j;
        char device[] = "/dev/ps";
        pid_t num_pids;
        pid_t* pid_array = NULL;
        pid_t* pidList=NULL;

        /* open device */ 
        fd = open(device, O_RDONLY);
        if (fd < 0)
                perror_msg_and_die("open failed for `%s'", device);

        /* Find out how many processes there are */
        if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0) 
                perror_msg_and_die("\nDEVPS_GET_PID_LIST");
        
        /* Allocate some memory -- grab a few extras just in case 
         * some new processes start up while we wait. The kernel will
         * just ignore any extras if we give it too many, and will trunc.
         * the list if we give it too few.  */
        pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
        pid_array[0] = num_pids+10;

        /* Now grab the pid list */
        if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0) 
                perror_msg_and_die("\nDEVPS_GET_PID_LIST");

        /* Now search for a match */
        for (i=1, j=0; i<pid_array[0] ; i++) {
                char* p;
                struct pid_info info;

            info.pid = pid_array[i];
            if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
                        perror_msg_and_die("\nDEVPS_GET_PID_INFO");

                /* Make sure we only match on the process name */
                p=info.command_line+1;
                while ((*p != 0) && !isspace(*(p)) && (*(p-1) != '\\')) { 
                        (p)++;
                }
                if (isspace(*(p)))
                                *p='\0';

                if ((strstr(info.command_line, pidName) != NULL)
                                && (strlen(pidName) == strlen(info.command_line))) {
                        pidList=xrealloc( pidList, sizeof(pid_t) * (j+2));
                        pidList[j++]=info.pid;
                }
        }
        if (pidList)
                pidList[j]=0;

        /* Free memory */
        free( pid_array);

        /* close device */
        if (close (fd) != 0) 
                perror_msg_and_die("close failed for `%s'", device);

        return pidList;
}
#else           /* BB_FEATURE_USE_DEVPS_PATCH */

/* find_pid_by_name()
 *  
 *  This finds the pid of the specified process.
 *  Currently, it's implemented by rummaging through 
 *  the proc filesystem.
 *
 *  Returns a list of all matching PIDs
 */
extern pid_t* find_pid_by_name( char* pidName)
{
        DIR *dir;
        struct dirent *next;
        pid_t* pidList=NULL;
        int i=0;

        dir = opendir("/proc");
        if (!dir)
                perror_msg_and_die("Cannot open /proc");
        
        while ((next = readdir(dir)) != NULL) {
                FILE *status;
                char filename[256];
                char buffer[256];

                /* If it isn't a number, we don't want it */
                if (!isdigit(*next->d_name))
                        continue;

                sprintf(filename, "/proc/%s/cmdline", next->d_name);
                status = fopen(filename, "r");
                if (!status) {
                        continue;
                }
                fgets(buffer, 256, status);
                fclose(status);

                if (strstr(get_last_path_component(buffer), pidName) != NULL) {
                        pidList=xrealloc( pidList, sizeof(pid_t) * (i+2));
                        pidList[i++]=strtol(next->d_name, NULL, 0);
                }
        }

        if (pidList)
                pidList[i]=0;
        return pidList;
}
#endif                                                  /* BB_FEATURE_USE_DEVPS_PATCH */
#endif                                                  /* BB_KILLALL || ( BB_FEATURE_LINUXRC && ( BB_HALT || BB_REBOOT || BB_POWEROFF )) */

#ifndef DMALLOC
/* this should really be farmed out to libbusybox.a */
extern void *xmalloc(size_t size)
{
        void *ptr = malloc(size);

        if (!ptr)
                error_msg_and_die(memory_exhausted);
        return ptr;
}

extern void *xrealloc(void *old, size_t size)
{
        void *ptr = realloc(old, size);
        if (!ptr)
                error_msg_and_die(memory_exhausted);
        return ptr;
}

extern void *xcalloc(size_t nmemb, size_t size)
{
        void *ptr = calloc(nmemb, size);
        if (!ptr)
                error_msg_and_die(memory_exhausted);
        return ptr;
}
#endif

#if defined BB_NFSMOUNT || defined BB_LS || defined BB_SH || \
        defined BB_WGET || defined BB_DPKG_DEB || defined BB_TAR || \
        defined BB_LN
# ifndef DMALLOC
extern char * xstrdup (const char *s) {
        char *t;

        if (s == NULL)
                return NULL;

        t = strdup (s);

        if (t == NULL)
                error_msg_and_die(memory_exhausted);

        return t;
}
# endif
#endif

#if defined BB_NFSMOUNT
extern char * xstrndup (const char *s, int n) {
        char *t;

        if (s == NULL)
                error_msg_and_die("xstrndup bug");

        t = xmalloc(++n);
        
        return safe_strncpy(t,s,n);
}
#endif

#if defined BB_IFCONFIG || defined BB_ROUTE || defined BB_NFSMOUNT || \
    defined BB_FEATURE_MOUNT_LOOP
/* Like strncpy but make sure the resulting string is always 0 terminated. */  
extern char * safe_strncpy(char *dst, const char *src, size_t size)
{   
        dst[size-1] = '\0';
        return strncpy(dst, src, size-1);   
}
#endif

#if (__GLIBC__ < 2) && (defined BB_SYSLOGD || defined BB_INIT)
extern int vdprintf(int d, const char *format, va_list ap)
{
        char buf[BUF_SIZE];
        int len;

        len = vsprintf(buf, format, ap);
        return write(d, buf, len);
}
#endif                                                  /* BB_SYSLOGD */


#if defined BB_FEATURE_MOUNT_LOOP
#include <fcntl.h>
#include "loop.h" /* Pull in loop device support */

extern int del_loop(const char *device)
{
        int fd;

        if ((fd = open(device, O_RDONLY)) < 0) {
                perror_msg("%s", device);
                return (FALSE);
        }
        if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
                perror_msg("ioctl: LOOP_CLR_FD");
                return (FALSE);
        }
        close(fd);
        return (TRUE);
}

extern int set_loop(const char *device, const char *file, int offset,
                                        int *loopro)
{
        struct loop_info loopinfo;
        int fd, ffd, mode;

        mode = *loopro ? O_RDONLY : O_RDWR;
        if ((ffd = open(file, mode)) < 0 && !*loopro
                && (errno != EROFS || (ffd = open(file, mode = O_RDONLY)) < 0)) {
                perror_msg("%s", file);
                return 1;
        }
        if ((fd = open(device, mode)) < 0) {
                close(ffd);
                perror_msg("%s", device);
                return 1;
        }
        *loopro = (mode == O_RDONLY);

        memset(&loopinfo, 0, sizeof(loopinfo));
        safe_strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);

        loopinfo.lo_offset = offset;

        loopinfo.lo_encrypt_key_size = 0;
        if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
                perror_msg("ioctl: LOOP_SET_FD");
                close(fd);
                close(ffd);
                return 1;
        }
        if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
                (void) ioctl(fd, LOOP_CLR_FD, 0);
                perror_msg("ioctl: LOOP_SET_STATUS");
                close(fd);
                close(ffd);
                return 1;
        }
        close(fd);
        close(ffd);
        return 0;
}

extern char *find_unused_loop_device(void)
{
        char dev[20];
        int i, fd;
        struct stat statbuf;
        struct loop_info loopinfo;

        for (i = 0; i <= 7; i++) {
                sprintf(dev, "/dev/loop%d", i);
                if (stat(dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
                        if ((fd = open(dev, O_RDONLY)) >= 0) {
                                if (ioctl(fd, LOOP_GET_STATUS, &loopinfo) == -1) {
                                        if (errno == ENXIO) {   /* probably free */
                                                close(fd);
                                                return strdup(dev);
                                        }
                                }
                                close(fd);
                        }
                }
        }
        return NULL;
}
#endif                                                  /* BB_FEATURE_MOUNT_LOOP */

#if defined BB_MOUNT || defined BB_DF || ( defined BB_UMOUNT && ! defined BB_MTAB)
extern int find_real_root_device_name(char* name)
{
        DIR *dir;
        struct dirent *entry;
        struct stat statBuf, rootStat;
        char fileName[BUFSIZ];

        if (stat("/", &rootStat) != 0) {
                error_msg("could not stat '/'");
                return( FALSE);
        }

        dir = opendir("/dev");
        if (!dir) {
                error_msg("could not open '/dev'");
                return( FALSE);
        }

        while((entry = readdir(dir)) != NULL) {

                /* Must skip ".." since that is "/", and so we 
                 * would get a false positive on ".."  */
                if (strcmp(entry->d_name, "..") == 0)
                        continue;

                snprintf( fileName, strlen(name)+1, "/dev/%s", entry->d_name);

                if (stat(fileName, &statBuf) != 0)
                        continue;
                /* Some char devices have the same dev_t as block
                 * devices, so make sure this is a block device */
                if (! S_ISBLK(statBuf.st_mode))
                        continue;
                if (statBuf.st_rdev == rootStat.st_rdev) {
                        strcpy(name, fileName); 
                        return ( TRUE);
                }
        }

        return( FALSE);
}
#endif


/* get_line_from_file() - This function reads an entire line from a text file
 * up to a newline. It returns a malloc'ed char * which must be stored and
 * free'ed  by the caller. */
extern char *get_line_from_file(FILE *file)
{
        static const int GROWBY = 80; /* how large we will grow strings by */

        int ch;
        int idx = 0;
        char *linebuf = NULL;
        int linebufsz = 0;

        while (1) {
                ch = fgetc(file);
                if (ch == EOF)
                        break;
                /* grow the line buffer as necessary */
                while (idx > linebufsz-2)
                        linebuf = xrealloc(linebuf, linebufsz += GROWBY);
                linebuf[idx++] = (char)ch;
                if ((char)ch == '\n')
                        break;
        }

        if (idx == 0)
                return NULL;

        linebuf[idx] = 0;
        return linebuf;
}

#if defined BB_CAT
extern void print_file(FILE *file)
{
        int c;

        while ((c = getc(file)) != EOF)
                putc(c, stdout);
        fclose(file);
        fflush(stdout);
}

extern int print_file_by_name(char *filename)
{
        FILE *file;
        if ((file = wfopen(filename, "r")) == NULL)
                return FALSE;
        print_file(file);
        return TRUE;
}
#endif /* BB_CAT */

#if defined BB_ECHO || defined BB_SH || defined BB_TR
char process_escape_sequence(char **ptr)
{
       static const char charmap[] = {
                   'a',  'b',  'f',  'n',  'r',  't',  'v',  '\\', 0,
               '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };

       const char *p;
           char *q;
       int num_digits;
       unsigned int n;

       n = 0;
           q = *ptr;

       for ( num_digits = 0 ; num_digits < 3 ; ++num_digits) {
               if ((*q < '0') || (*q > '7')) { /* not a digit? */
                       break;
               }
               n = n * 8 + (*q++ - '0');
       }

       if (num_digits == 0) {   /* mnemonic escape sequence? */
                   for (p=charmap ; *p ; p++) {
                           if (*p == *q) {
                                   q++;
                                   break;
                           }
                   }
                   n = *(p+(sizeof(charmap)/2));
           }

           /* doesn't hurt to fall through to here from mnemonic case */
           if (n > UCHAR_MAX) { /* is octal code too big for a char? */
                   n /= 8;                      /* adjust value and */
                   --q;                         /* back up one char */
           }

           *ptr = q;
           return (char) n;
}
#endif

#if defined BB_BASENAME || defined BB_LN || defined BB_SH || defined BB_INIT || \
        ! defined BB_FEATURE_USE_DEVPS_PATCH || defined BB_WGET
char *get_last_path_component(char *path)
{
        char *s=path+strlen(path)-1;

        /* strip trailing slashes */
        while (s != path && *s == '/') {
                *s-- = '\0';
        }

        /* find last component */
        s = strrchr(path, '/');
        if (s == NULL || s[1] == '\0')
                return path;
        else
                return s+1;
}
#endif

#if defined BB_GREP || defined BB_SED
#include <regex.h>
void xregcomp(regex_t *preg, const char *regex, int cflags)
{
        int ret;
        if ((ret = regcomp(preg, regex, cflags)) != 0) {
                int errmsgsz = regerror(ret, preg, NULL, 0);
                char *errmsg = xmalloc(errmsgsz);
                regerror(ret, preg, errmsg, errmsgsz);
                error_msg_and_die("xregcomp: %s", errmsg);
        }
}
#endif

#if defined BB_CAT || defined BB_HEAD || defined BB_WC
FILE *wfopen(const char *path, const char *mode)
{
        FILE *fp;
        if ((fp = fopen(path, mode)) == NULL) {
                perror_msg("%s", path);
                errno = 0;
        }
        return fp;
}
#endif

#if defined BB_HOSTNAME || defined BB_LOADACM || defined BB_MORE \
 || defined BB_SED || defined BB_SH || defined BB_TAR || defined BB_UNIQ \
 || defined BB_WC || defined BB_CMP || defined BB_SORT || defined BB_WGET \
 || defined BB_MOUNT || defined BB_ROUTE
FILE *xfopen(const char *path, const char *mode)
{
        FILE *fp;
        if ((fp = fopen(path, mode)) == NULL)
                perror_msg_and_die("%s", path);
        return fp;
}
#endif

static int applet_name_compare(const void *x, const void *y)
{
        const char *name = x;
        const struct BB_applet *applet = y;

        return strcmp(name, applet->name);
}

extern size_t NUM_APPLETS;

struct BB_applet *find_applet_by_name(const char *name)
{
        return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
                        applet_name_compare);
}

void run_applet_by_name(const char *name, int argc, char **argv)
{
        /* Do a binary search to find the applet entry given the name. */
        if ((applet_using = find_applet_by_name(name)) != NULL) {
                applet_name = applet_using->name;
                if (argv[1] && strcmp(argv[1], "--help") == 0)
                        show_usage();
                exit((*(applet_using->main)) (argc, argv));
        }
}

#if defined BB_DD || defined BB_TAIL || defined BB_STTY
unsigned long parse_number(const char *numstr,
                const struct suffix_mult *suffixes)
{
        const struct suffix_mult *sm;
        unsigned long int ret;
        int len;
        char *end;
        
        ret = strtoul(numstr, &end, 10);
        if (numstr == end)
                error_msg_and_die("invalid number `%s'", numstr);
        while (end[0] != '\0') {
                sm = suffixes;
                while ( sm != 0 ) {
                        if(sm->suffix) {
                                len = strlen(sm->suffix);
                                if (strncmp(sm->suffix, end, len) == 0) {
                                        ret *= sm->mult;
                                        end += len;
                                        break;
                                }
                        sm++;
                        
                        } else
                                sm = 0;
                }
                if (sm == 0)
                        error_msg_and_die("invalid number `%s'", numstr);
        }
        return ret;
}
#endif

#if defined BB_DD || defined BB_NC || defined BB_TAIL
ssize_t safe_read(int fd, void *buf, size_t count)
{
        ssize_t n;

        do {
                n = read(fd, buf, count);
        } while (n < 0 && errno == EINTR);

        return n;
}
#endif

#ifdef BB_FEATURE_HUMAN_READABLE
const char *format(unsigned long val, unsigned long hr)
{
        static const char strings[] = { '0', 0, 'k', 0, 'M', 0, 'G', 0 };
        static const char fmt[] = "%lu";
        static const char fmt_u[] = "%lu.%lu%s";

        static char str[10];

        unsigned long frac __attribute__ ((unused));    /* 'may be uninitialized' warning is ok */
        const char *u;
        const char *f;

#if 1
        if(val == 0) {                          /* This may be omitted to reduce size */
                return strings;                 /* at the cost of speed. */
        }
#endif

        u = strings;
        f = fmt;
        if (hr) {
                val /= hr;
        } else {
                while ((val >= KILOBYTE) && (*u != 'G')) {
                        f = fmt_u;
                        u += 2;
                        frac = (((val % KILOBYTE) * 10) + (KILOBYTE/2)) / KILOBYTE;
                        val /= KILOBYTE;
                        if (frac >= 10) {       /* We need to round up here. */
                                ++val;
                                frac = 0;
                        }
                }
        }

        /* If f==fmt then 'frac' and 'u' are ignored and need not be set. */
        snprintf(str, sizeof(str), f, val, frac, u);

        return str;
}
#endif

#if defined(BB_GREP) || defined(BB_HOSTNAME) || defined(BB_SED) || defined(BB_TAR) || defined(BB_WGET) || defined(BB_XARGS)
void chomp(char *s)
{
        size_t len = strlen(s);

        if (len == 0)
                return;

        if (s[len-1] == '\n')
                s[len-1] = '\0';
}
#endif

/* END CODE */
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/