blob: 699d09c67c90a5dfff72d6a9dcfec3c4b7a47ba5 [file] [log] [blame]
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2006 Rob Landley
* Copyright (C) 2006 Denis Vlasenko
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
#ifndef DMALLOC
#ifdef L_xmalloc
void *xmalloc(size_t size)
{
void *ptr = malloc(size);
if (ptr == NULL && size != 0)
bb_error_msg_and_die(bb_msg_memory_exhausted);
return ptr;
}
#endif
#ifdef L_xrealloc
void *xrealloc(void *ptr, size_t size)
{
ptr = realloc(ptr, size);
if (ptr == NULL && size != 0)
bb_error_msg_and_die(bb_msg_memory_exhausted);
return ptr;
}
#endif
#ifdef L_xzalloc
void *xzalloc(size_t size)
{
void *ptr = xmalloc(size);
memset(ptr, 0, size);
return ptr;
}
#endif
#ifdef L_xcalloc
void *xcalloc(size_t nmemb, size_t size)
{
void *ptr = calloc(nmemb, size);
if (ptr == NULL && nmemb != 0 && size != 0)
bb_error_msg_and_die(bb_msg_memory_exhausted);
return ptr;
}
#endif
#endif /* DMALLOC */
#ifdef L_xstrdup
char * xstrdup (const char *s)
{
char *t;
if (s == NULL)
return NULL;
t = strdup (s);
if (t == NULL)
bb_error_msg_and_die(bb_msg_memory_exhausted);
return t;
}
#endif
#ifdef L_xstrndup
char * xstrndup (const char *s, int n)
{
char *t;
if (ENABLE_DEBUG && s == NULL)
bb_error_msg_and_die("xstrndup bug");
t = xmalloc(++n);
return safe_strncpy(t,s,n);
}
#endif
#ifdef L_xfopen
FILE *xfopen(const char *path, const char *mode)
{
FILE *fp;
if ((fp = fopen(path, mode)) == NULL)
bb_perror_msg_and_die("%s", path);
return fp;
}
#endif
#ifdef L_xopen
int xopen(const char *pathname, int flags)
{
return xopen3(pathname, flags, 0777);
}
#endif
#ifdef L_xopen3
int xopen3(const char *pathname, int flags, int mode)
{
int ret;
ret = open(pathname, flags, mode);
if (ret < 0) {
bb_perror_msg_and_die("%s", pathname);
}
return ret;
}
#endif
#ifdef L_xread
// Die with an error message if we can't read the entire buffer.
void xread(int fd, void *buf, size_t count)
{
while (count) {
ssize_t size;
if ((size = safe_read(fd, buf, count)) < 1)
bb_error_msg_and_die("Short read");
count -= size;
buf = ((char *) buf) + size;
}
}
#endif
#ifdef L_xwrite
// Die with an error message if we can't write the entire buffer.
void xwrite(int fd, void *buf, size_t count)
{
while (count) {
ssize_t size;
if ((size = safe_write(fd, buf, count)) < 1)
bb_error_msg_and_die("Short write");
count -= size;
buf = ((char *) buf) + size;
}
}
#endif
#ifdef L_xlseek
// Die if we can't lseek to the right spot.
void xlseek(int fd, off_t offset, int whence)
{
if (whence != lseek(fd, offset, whence)) bb_error_msg_and_die("lseek");
}
#endif
#ifdef L_xread_char
unsigned char xread_char(int fd)
{
char tmp;
xread(fd, &tmp, 1);
return(tmp);
}
#endif
#ifdef L_xferror
void xferror(FILE *fp, const char *fn)
{
if (ferror(fp)) {
bb_error_msg_and_die("%s", fn);
}
}
#endif
#ifdef L_xferror_stdout
void xferror_stdout(void)
{
xferror(stdout, bb_msg_standard_output);
}
#endif
#ifdef L_xfflush_stdout
void xfflush_stdout(void)
{
if (fflush(stdout)) {
bb_perror_msg_and_die(bb_msg_standard_output);
}
}
#endif
#ifdef L_spawn
// This does a fork/exec in one call, using vfork().
pid_t spawn(char **argv)
{
static int failed;
pid_t pid;
void *app = find_applet_by_name(argv[0]);
// Be nice to nommu machines.
failed = 0;
pid = vfork();
if (pid < 0) return pid;
if (!pid) {
execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv);
// We're sharing a stack with blocked parent, let parent know we failed
// and then exit to unblock parent (but don't run atexit() stuff, which
// would screw up parent.)
failed = -1;
_exit(0);
}
return failed ? failed : pid;
}
#endif
#ifdef L_xspawn
pid_t xspawn(char **argv)
{
pid_t pid = spawn(argv);
if (pid < 0) bb_perror_msg_and_die("%s", *argv);
return pid;
}
#endif
#ifdef L_wait4
int wait4pid(int pid)
{
int status;
if (pid == -1 || waitpid(pid, &status, 0) == -1) return -1;
if (WIFEXITED(status)) return WEXITSTATUS(status);
if (WIFSIGNALED(status)) return WTERMSIG(status);
return 0;
}
#endif
#ifdef L_itoa
// Largest 32 bit integer is -2 billion plus null terminator.
// Int should always be 32 bits on a Unix-oid system, see
// http://www.unix.org/whitepapers/64bit.html
static char local_buf[12];
void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
{
int i, out = 0;
if (buflen) {
for (i=1000000000; i; i/=10) {
int res = n/i;
if ((res || out || i == 1) && --buflen>0) {
out++;
n -= res*i;
*buf++ = '0' + res;
}
}
*buf = 0;
}
}
// Note: uses static buffer, calling it twice in a row will overwrite.
char *utoa(unsigned n)
{
utoa_to_buf(n, local_buf, sizeof(local_buf));
return local_buf;
}
void itoa_to_buf(int n, char *buf, unsigned buflen)
{
if (buflen && n<0) {
n = -n;
*buf++ = '-';
buflen--;
}
utoa_to_buf((unsigned)n, buf, buflen);
}
// Note: uses static buffer, calling it twice in a row will overwrite.
char *itoa(int n)
{
itoa_to_buf(n, local_buf, sizeof(local_buf));
return local_buf;
}
#endif
#ifdef L_setuid
void xsetgid(gid_t gid)
{
if (setgid(gid)) bb_error_msg_and_die("setgid");
}
void xsetuid(uid_t uid)
{
if (setuid(uid)) bb_error_msg_and_die("setuid");
}
#endif
#ifdef L_fdlength
off_t fdlength(int fd)
{
off_t bottom = 0, top = 0, pos;
long size;
// If the ioctl works for this, return it.
if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
// If not, do a binary search for the last location we can read.
do {
char temp;
pos = bottom + (top - bottom) / 2;;
// If we can read from the current location, it's bigger.
if (lseek(fd, pos, 0)>=0 && safe_read(fd, &temp, 1)==1) {
if (bottom == top) bottom = top = (top+1) * 2;
else bottom = pos;
// If we can't, it's smaller.
} else {
if (bottom == top) {
if (!top) return 0;
bottom = top/2;
}
else top = pos;
}
} while (bottom + 1 != top);
return pos + 1;
}
#endif
#ifdef L_xasprintf
char *xasprintf(const char *format, ...)
{
va_list p;
int r;
char *string_ptr;
#if 1
// GNU extension
va_start(p, format);
r = vasprintf(&string_ptr, format, p);
va_end(p);
#else
// Bloat for systems that haven't got the GNU extension.
va_start(p, format);
r = vsnprintf(NULL, 0, format, p);
va_end(p);
string_ptr = xmalloc(r+1);
va_start(p, format);
r = vsnprintf(string_ptr, r+1, format, p);
va_end(p);
#endif
if (r < 0) bb_perror_msg_and_die("xasprintf");
return string_ptr;
}
#endif
#ifdef L_xprint_and_close_file
void xprint_and_close_file(FILE *file)
{
// copyfd outputs error messages for us.
if (bb_copyfd_eof(fileno(file), 1) == -1) exit(bb_default_error_retval);
fclose(file);
}
#endif
#ifdef L_xchdir
void xchdir(const char *path)
{
if (chdir(path))
bb_perror_msg_and_die("chdir(%s)", path);
}
#endif
#ifdef L_warn_opendir
DIR *warn_opendir(const char *path)
{
DIR *dp;
if ((dp = opendir(path)) == NULL) {
bb_perror_msg("unable to open `%s'", path);
return NULL;
}
return dp;
}
#endif
#ifdef L_xopendir
DIR *xopendir(const char *path)
{
DIR *dp;
if ((dp = opendir(path)) == NULL)
bb_perror_msg_and_die("unable to open `%s'", path);
return dp;
}
#endif
#ifdef L_xdaemon
#ifndef BB_NOMMU
void xdaemon(int nochdir, int noclose)
{
if (daemon(nochdir, noclose)) bb_perror_msg_and_die("daemon");
}
#endif
#endif
#ifdef L_xbind
void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
{
if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
}
#endif
#ifdef L_xsocket
int xsocket(int domain, int type, int protocol)
{
int r = socket(domain, type, protocol);
if (r < 0) bb_perror_msg_and_die("socket");
return r;
}
#endif
#ifdef L_xlisten
void xlisten(int s, int backlog)
{
if (listen(s, backlog)) bb_perror_msg_and_die("listen");
}
#endif