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busybox/utility.c
Erik Andersen d07ee46919 Removed proc dependancies for init and free (which maintaining exactly 
the same functionality).  /proc takes up 90k of kernel space, so it is
nice to avoid using it at all costs.  The only places where it is depended
on is for cetain optional mount/umount features, and for ps and lsmod.
 -Erik
2000-02-21 21:26:32 +00:00

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/* 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 "internal.h"
#if defined (BB_CHMOD_CHOWN_CHGRP) \
|| defined (BB_CP_MV) \
|| defined (BB_FIND) \
|| defined (BB_LS) \
|| defined (BB_INSMOD)
/* same conditions as recursiveAction */
#define bb_need_name_too_long
#endif
#define BB_DECLARE_EXTERN
#include "messages.c"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <time.h>
#include <utime.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/param.h> /* for PATH_MAX */
#include <sys/utsname.h> /* for uname(2) */
#if defined BB_FEATURE_MOUNT_LOOP
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/loop.h>
#endif
#if defined BB_MOUNT || defined BB_UMOUNT || defined BB_DF
# if defined BB_FEATURE_USE_PROCFS
const char mtab_file[] = "/proc/mounts";
# else
# if defined BB_MTAB
const char mtab_file[] = "/etc/mtab";
# else
# error With (BB_MOUNT||BB_UMOUNT||BB_DF) defined, you must define either BB_MTAB or BB_FEATURE_USE_PROCFS
# endif
# endif
#endif
extern void usage(const char *usage)
{
fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
BB_VER, BB_BT);
fprintf(stderr, "Usage: %s\n", usage);
exit FALSE;
}
extern void errorMsg(char *s, ...)
{
va_list p;
va_start(p, s);
fflush(stdout);
fprintf(stderr, "\n");
vfprintf(stderr, s, p);
fprintf(stderr, "\n");
va_end(p);
}
extern void fatalError(char *s, ...)
{
va_list p;
va_start(p, s);
fflush(stdout);
fprintf(stderr, "\n");
vfprintf(stderr, s, p);
fprintf(stderr, "\n");
va_end(p);
exit( FALSE);
}
#if defined (BB_INIT) || defined (BB_PS)
/* 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> }
*/
int get_kernel_revision()
{
struct utsname name;
int major = 0, minor = 0, patch = 0;
if (uname(&name) == -1) {
perror("cannot get system information");
return (0);
}
sscanf(name.version, "%d.%d.%d", &major, &minor, &patch);
return major * 65536 + minor * 256 + patch;
}
#endif /* BB_INIT || BB_PS */
#if defined (BB_CP_MV) || defined (BB_DU) || defined (BB_LN)
/*
* Return TRUE if a fileName is a directory.
* Nonexistant files return FALSE.
*/
int isDirectory(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_CP_MV)
/*
* 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 indicted if the attributes cannot
* be set.)
* -Erik Andersen
*/
int
copyFile(const char *srcName, const char *destName,
int setModes, int followLinks)
{
int rfd;
int wfd;
int rcc;
int status;
char buf[BUF_SIZE];
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(srcName);
return FALSE;
}
if (followLinks == TRUE)
status = stat(destName, &dstStatBuf);
else
status = lstat(destName, &dstStatBuf);
if (status < 0) {
dstStatBuf.st_ino = -1;
dstStatBuf.st_dev = -1;
}
if ((srcStatBuf.st_dev == dstStatBuf.st_dev) &&
(srcStatBuf.st_ino == dstStatBuf.st_ino)) {
fprintf(stderr, "Copying file \"%s\" to itself\n", 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(destName);
return FALSE;
}
} else if (S_ISLNK(srcStatBuf.st_mode)) {
char link_val[PATH_MAX + 1];
int link_size;
//fprintf(stderr, "copying link %s to %s\n", srcName, destName);
/* Warning: This could possibly truncate silently, to PATH_MAX chars */
link_size = readlink(srcName, &link_val[0], PATH_MAX);
if (link_size < 0) {
perror(srcName);
return FALSE;
}
link_val[link_size] = '\0';
status = symlink(link_val, destName);
if (status < 0) {
perror(destName);
return FALSE;
}
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
if (setModes == TRUE) {
if (lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0) {
perror(destName);
return FALSE;
}
}
#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(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(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(srcName);
return FALSE;
}
wfd =
open(destName, O_WRONLY | O_CREAT | O_TRUNC,
srcStatBuf.st_mode);
if (wfd < 0) {
perror(destName);
close(rfd);
return FALSE;
}
while ((rcc = read(rfd, buf, sizeof(buf))) > 0) {
if (fullWrite(wfd, buf, rcc) < 0)
goto error_exit;
}
if (rcc < 0) {
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(destName);
exit FALSE;
}
if (chmod(destName, srcStatBuf.st_mode) < 0) {
perror(destName);
exit FALSE;
}
times.actime = srcStatBuf.st_atime;
times.modtime = srcStatBuf.st_mtime;
if (utime(destName, &times) < 0) {
perror(destName);
exit FALSE;
}
}
return TRUE;
error_exit:
perror(destName);
close(rfd);
close(wfd);
return FALSE;
}
#endif /* BB_CP_MV */
#if defined BB_TAR || defined BB_LS
#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
};
#define MODE1 "rwxrwxrwx"
#define MODE0 "---------"
#define SMODE1 "..s..s..t"
#define 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 *modeString(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
/*
* Return the standard ls-like time string from a time_t
* This is static and so is overwritten on each call.
*/
const char *timeString(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 */
#if defined BB_TAR || 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 fullWrite(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 /* BB_TAR || BB_CP_MV */
#if defined BB_TAR || defined BB_TAIL
/*
* 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 fullRead(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 */
#if defined (BB_CHMOD_CHOWN_CHGRP) \
|| defined (BB_CP_MV) \
|| defined (BB_FIND) \
|| defined (BB_LS) \
|| defined (BB_INSMOD)
/*
* Walk down all the directories under the specified
* location, and do something (something specified
* by the fileAction and dirAction function pointers).
*
* Unfortunatly, 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 recursiveAction(const char *fileName,
int recurse, int followLinks, int depthFirst,
int (*fileAction) (const char *fileName,
struct stat * statbuf),
int (*dirAction) (const char *fileName,
struct stat * statbuf))
{
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(fileName);
return FALSE;
}
if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
if (fileAction == NULL)
return TRUE;
else
return fileAction(fileName, &statbuf);
}
if (recurse == FALSE) {
if (S_ISDIR(statbuf.st_mode)) {
if (dirAction != NULL)
return (dirAction(fileName, &statbuf));
else
return TRUE;
}
}
if (S_ISDIR(statbuf.st_mode)) {
DIR *dir;
dir = opendir(fileName);
if (!dir) {
perror(fileName);
return FALSE;
}
if (dirAction != NULL && depthFirst == FALSE) {
status = dirAction(fileName, &statbuf);
if (status == FALSE) {
perror(fileName);
return FALSE;
}
}
while ((next = readdir(dir)) != NULL) {
char nextFile[PATH_MAX + 1];
if ((strcmp(next->d_name, "..") == 0)
|| (strcmp(next->d_name, ".") == 0)) {
continue;
}
if (strlen(fileName) + strlen(next->d_name) + 1 > PATH_MAX) {
fprintf(stderr, name_too_long, "ftw");
return FALSE;
}
sprintf(nextFile, "%s/%s", fileName, next->d_name);
status =
recursiveAction(nextFile, TRUE, followLinks, depthFirst,
fileAction, dirAction);
if (status < 0) {
closedir(dir);
return FALSE;
}
}
status = closedir(dir);
if (status < 0) {
perror(fileName);
return FALSE;
}
if (dirAction != NULL && depthFirst == TRUE) {
status = dirAction(fileName, &statbuf);
if (status == FALSE) {
perror(fileName);
return FALSE;
}
}
} else {
if (fileAction == NULL)
return TRUE;
else
return fileAction(fileName, &statbuf);
}
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 createPath(const char *name, int mode)
{
char *cp;
char *cpOld;
char buf[PATH_MAX + 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(buf);
return FALSE;
}
*cpOld = '/';
}
return TRUE;
}
#endif /* BB_TAR || BB_MKDIR */
#if defined (BB_CHMOD_CHOWN_CHGRP) || defined (BB_MKDIR)
/* [ugoa]{+|-|=}[rwxst] */
extern int parse_mode(const char *s, mode_t * theMode)
{
mode_t andMode =
S_ISVTX | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
mode_t orMode = 0;
mode_t mode = 0;
mode_t groups = 0;
char type;
char c;
do {
for (;;) {
switch (c = *s++) {
case '\0':
return -1;
case 'u':
groups |= S_ISUID | S_IRWXU;
continue;
case 'g':
groups |= S_ISGID | S_IRWXG;
continue;
case 'o':
groups |= S_IRWXO;
continue;
case 'a':
groups |= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
continue;
case '+':
case '=':
case '-':
type = c;
if (groups == 0) /* The default is "all" */
groups |=
S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
break;
default:
if (isdigit(c) && c >= '0' && c <= '7' &&
mode == 0 && groups == 0) {
*theMode = strtol(--s, NULL, 8);
return (TRUE);
} else
return (FALSE);
}
break;
}
while ((c = *s++) != '\0') {
switch (c) {
case ',':
break;
case 'r':
mode |= S_IRUSR | S_IRGRP | S_IROTH;
continue;
case 'w':
mode |= S_IWUSR | S_IWGRP | S_IWOTH;
continue;
case 'x':
mode |= S_IXUSR | S_IXGRP | S_IXOTH;
continue;
case 's':
mode |= S_IXGRP | S_ISUID | S_ISGID;
continue;
case 't':
mode |= 0;
continue;
default:
*theMode &= andMode;
*theMode |= orMode;
return (TRUE);
}
break;
}
switch (type) {
case '=':
andMode &= ~(groups);
/* fall through */
case '+':
orMode |= mode & groups;
break;
case '-':
andMode &= ~(mode & groups);
orMode &= andMode;
break;
}
} while (c == ',');
*theMode &= andMode;
*theMode |= orMode;
return (TRUE);
}
#endif /* BB_CHMOD_CHOWN_CHGRP || BB_MKDIR */
#if defined (BB_CHMOD_CHOWN_CHGRP) || defined (BB_PS)
/* Use this to avoid needing the glibc NSS stuff
* This uses storage buf to hold things.
* */
uid_t my_getid(const char *filename, char *name, uid_t id)
{
FILE *file;
char *rname, *start, *end, buf[128];
uid_t rid;
file = fopen(filename, "r");
if (file == NULL) {
perror(filename);
return (-1);
}
while (fgets(buf, 128, file) != NULL) {
if (buf[0] == '#')
continue;
start = buf;
end = strchr(start, ':');
if (end == NULL)
continue;
*end = '\0';
rname = start;
start = end + 1;
end = strchr(start, ':');
if (end == NULL)
continue;
start = end + 1;
rid = (uid_t) strtol(start, &end, 10);
if (end == start)
continue;
if (name) {
if (0 == strcmp(rname, name)) {
fclose(file);
return (rid);
}
}
if (id != -1 && id == rid) {
strncpy(name, rname, 8);
fclose(file);
return (TRUE);
}
}
fclose(file);
return (-1);
}
uid_t my_getpwnam(char *name)
{
return my_getid("/etc/passwd", name, -1);
}
gid_t my_getgrnam(char *name)
{
return my_getid("/etc/group", name, -1);
}
void my_getpwuid(char *name, uid_t uid)
{
my_getid("/etc/passwd", name, uid);
}
void my_getgrgid(char *group, gid_t gid)
{
my_getid("/etc/group", group, gid);
}
#endif /* BB_CHMOD_CHOWN_CHGRP || BB_PS */
#if (defined BB_CHVT) || (defined BB_DEALLOCVT)
#include <linux/kd.h>
#include <sys/ioctl.h>
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;
fprintf(stderr,
"Couldnt get a file descriptor referring to the console\n");
return -1; /* total failure */
}
#endif /* BB_CHVT || BB_DEALLOCVT */
#if !defined BB_REGEXP && (defined BB_GREP || defined BB_SED)
/* Do a case insensitive strstr() */
char *stristr(char *haystack, const char *needle)
{
int len = strlen(needle);
while (*haystack) {
if (!strncasecmp(haystack, needle, len))
break;
haystack++;
}
if (!(*haystack))
haystack = NULL;
return haystack;
}
/* This tries to find a needle in a haystack, but does so by
* only trying to match literal strings (look 'ma, no regexps!)
* This is short, sweet, and carries _very_ little baggage,
* unlike its beefier cousin in regexp.c
* -Erik Andersen
*/
extern int find_match(char *haystack, char *needle, int ignoreCase)
{
if (ignoreCase == FALSE)
haystack = strstr(haystack, needle);
else
haystack = stristr(haystack, needle);
if (haystack == NULL)
return FALSE;
return TRUE;
}
/* This performs substitutions after a string match has been found. */
extern int replace_match(char *haystack, char *needle, char *newNeedle,
int ignoreCase)
{
int foundOne = 0;
char *where, *slider, *slider1, *oldhayStack;
if (ignoreCase == FALSE)
where = strstr(haystack, needle);
else
where = stristr(haystack, needle);
if (strcmp(needle, newNeedle) == 0)
return FALSE;
oldhayStack = (char *) malloc((unsigned) (strlen(haystack)));
while (where != NULL) {
foundOne++;
strcpy(oldhayStack, haystack);
#if 0
if (strlen(newNeedle) > strlen(needle)) {
haystack =
(char *) realloc(haystack,
(unsigned) (strlen(haystack) -
strlen(needle) +
strlen(newNeedle)));
}
#endif
for (slider = haystack, slider1 = oldhayStack; slider != where;
slider++, slider1++);
*slider = 0;
haystack = strcat(haystack, newNeedle);
slider1 += strlen(needle);
haystack = strcat(haystack, slider1);
where = strstr(slider, needle);
}
free(oldhayStack);
if (foundOne > 0)
return TRUE;
else
return FALSE;
}
#endif /* ! BB_REGEXP && (BB_GREP || BB_SED) */
#if defined BB_FIND
/*
* 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;
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;
}
//if (!found)
if (found == TRUE) {
pattern = retryPat;
text = ++retryText;
}
/* 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 */
#if defined BB_DF || defined BB_MTAB
/*
* 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 *findMountPoint(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_DD || defined BB_TAIL
/*
* Read a number with a possible multiplier.
* Returns -1 if the number format is illegal.
*/
extern long getNum(const char *cp)
{
long value;
if (!isDecimal(*cp))
return -1;
value = 0;
while (isDecimal(*cp))
value = value * 10 + *cp++ - '0';
switch (*cp++) {
case 'M':
case 'm': /* `tail' uses it traditionally */
value *= 1048576;
break;
case 'k':
value *= 1024;
break;
case 'b':
value *= 512;
break;
case 'w':
value *= 2;
break;
case '\0':
return value;
default:
return -1;
}
if (*cp)
return -1;
return value;
}
#endif /* BB_DD || BB_TAIL */
#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_INIT || defined BB_HALT || defined BB_REBOOT
#if ! defined BB_FEATURE_USE_PROCFS
#error Sorry, I depend on the /proc filesystem right now.
#endif
/* findInitPid()
*
* This finds the pid of init (which is not always 1).
* Currently, it's implemented by rummaging through the proc filesystem.
*
* [return]
* 0 failure
* pid when init's pid is found.
*/
extern pid_t findInitPid()
{
pid_t init_pid;
char filename[256];
char buffer[256];
/* no need to opendir ;) */
for (init_pid = 1; init_pid < 65536; init_pid++) {
FILE *status;
sprintf(filename, "/proc/%d/status", init_pid);
status = fopen(filename, "r");
if (!status) {
continue;
}
fgets(buffer, 256, status);
fclose(status);
if ((strstr(buffer, "init\n") != NULL)) {
return init_pid;
}
}
return 0;
}
#endif /* BB_INIT || BB_HALT || BB_REBOOT */
#if defined BB_GUNZIP \
|| defined BB_GZIP \
|| defined BB_PRINTF \
|| defined BB_TAIL
extern void *xmalloc(size_t size)
{
void *cp = malloc(size);
if (cp == NULL) {
errorMsg("out of memory");
}
return cp;
}
#endif /* BB_GUNZIP || BB_GZIP || BB_PRINTF || BB_TAIL */
#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
extern int del_loop(const char *device)
{
int fd;
if ((fd = open(device, O_RDONLY)) < 0) {
perror(device);
return (FALSE);
}
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
perror("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(file);
return 1;
}
if ((fd = open(device, mode)) < 0) {
close(ffd);
perror(device);
return 1;
}
*loopro = (mode == O_RDONLY);
memset(&loopinfo, 0, sizeof(loopinfo));
strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
loopinfo.lo_name[LO_NAME_SIZE - 1] = 0;
loopinfo.lo_offset = offset;
loopinfo.lo_encrypt_key_size = 0;
if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
perror("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("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_MTAB
#define whine_if_fstab_is_missing() {}
#else
extern void whine_if_fstab_is_missing()
{
struct stat statBuf;
if (stat("/etc/fstab", &statBuf) < 0)
fprintf(stderr,
"/etc/fstab file missing -- install one to name /dev/root.\n\n");
}
#endif
/* END CODE */
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