*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2006 Rob Landley
- * Copyright (C) 2006 Denis Vlasenko
+ * Copyright (C) 2006 Denys Vlasenko
*
* Licensed under GPL version 2, see file LICENSE in this tarball for details.
*/
-#include "libbb.h"
-
-/* All the functions starting with "x" call bb_error_msg_and_die() if they
- * fail, so callers never need to check for errors. If it returned, it
- * succeeded. */
-
-#ifndef DMALLOC
-/* dmalloc provides variants of these that do abort() on failure.
- * Since dmalloc's prototypes overwrite the impls here as they are
- * included after these prototypes in libbb.h, all is well.
+/* We need to have separate xfuncs.c and xfuncs_printf.c because
+ * with current linkers, even with section garbage collection,
+ * if *.o module references any of XXXprintf functions, you pull in
+ * entire printf machinery. Even if you do not use the function
+ * which uses XXXprintf.
+ *
+ * xfuncs.c contains functions (not necessarily xfuncs)
+ * which do not pull in printf, directly or indirectly.
+ * xfunc_printf.c contains those which do.
+ *
+ * TODO: move xmalloc() and xatonum() here.
*/
-// Warn if we can't allocate size bytes of memory.
-void *malloc_or_warn(size_t size)
-{
- void *ptr = malloc(size);
- if (ptr == NULL && size != 0)
- bb_error_msg(bb_msg_memory_exhausted);
- return ptr;
-}
-
-// Die if we can't allocate size bytes of memory.
-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;
-}
-
-// Die if we can't resize previously allocated memory. (This returns a pointer
-// to the new memory, which may or may not be the same as the old memory.
-// It'll copy the contents to a new chunk and free the old one if necessary.)
-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 /* DMALLOC */
-
-// Die if we can't allocate and zero size bytes of memory.
-void *xzalloc(size_t size)
-{
- void *ptr = xmalloc(size);
- memset(ptr, 0, size);
- return ptr;
-}
-
-// Die if we can't copy a string to freshly allocated memory.
-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;
-}
-
-// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
-// the (possibly truncated to length n) string into it.
-char * xstrndup(const char *s, int n)
-{
- int m;
- char *t;
-
- if (ENABLE_DEBUG && s == NULL)
- bb_error_msg_and_die("xstrndup bug");
-
- /* We can just xmalloc(n+1) and strncpy into it, */
- /* but think about xstrndup("abc", 10000) wastage! */
- m = n;
- t = (char*) s;
- while (m) {
- if (!*t) break;
- m--;
- t++;
- }
- n -= m;
- t = xmalloc(n + 1);
- t[n] = '\0';
-
- return memcpy(t, s, n);
-}
-
-// Die if we can't open a file and return a FILE * to it.
-// Notice we haven't got xfread(), This is for use with fscanf() and friends.
-FILE *xfopen(const char *path, const char *mode)
-{
- FILE *fp = fopen(path, mode);
- if (fp == NULL)
- bb_perror_msg_and_die("can't open '%s'", path);
- return fp;
-}
-
-// Die if we can't open a file and return a fd.
-int xopen3(const char *pathname, int flags, int mode)
-{
- int ret;
- ret = open(pathname, flags, mode);
- if (ret < 0) {
- bb_perror_msg_and_die("can't open '%s'", pathname);
- }
- return ret;
-}
-
-// Die if we can't open an existing file and return a fd.
-int xopen(const char *pathname, int flags)
-{
- return xopen3(pathname, flags, 0666);
-}
-
-// Warn if we can't open a file and return a fd.
-int open3_or_warn(const char *pathname, int flags, int mode)
-{
- int ret;
-
- ret = open(pathname, flags, mode);
- if (ret < 0) {
- bb_perror_msg("can't open '%s'", pathname);
- }
- return ret;
-}
-
-// Warn if we can't open a file and return a fd.
-int open_or_warn(const char *pathname, int flags)
-{
- return open3_or_warn(pathname, flags, 0666);
-}
-
-void xpipe(int filedes[2])
-{
- if (pipe(filedes))
- bb_perror_msg_and_die("can't create pipe");
-}
-
-void xunlink(const char *pathname)
-{
- if (unlink(pathname))
- bb_perror_msg_and_die("can't remove file '%s'", pathname);
-}
-
-// Turn on nonblocking I/O on a fd
-int ndelay_on(int fd)
-{
- return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL,0) | O_NONBLOCK);
-}
-
-int ndelay_off(int fd)
-{
- return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL,0) & ~O_NONBLOCK);
-}
-
-void xdup2(int from, int to)
-{
- if (dup2(from, to) != to)
- bb_perror_msg_and_die("can't duplicate file descriptor");
-}
-
-// "Renumber" opened fd
-void xmove_fd(int from, int to)
-{
- if (from == to)
- return;
- xdup2(from, to);
- close(from);
-}
-
-// Die with an error message if we can't write the entire buffer.
-void xwrite(int fd, const void *buf, size_t count)
-{
- if (count) {
- ssize_t size = full_write(fd, buf, count);
- if (size != count)
- bb_error_msg_and_die("short write");
- }
-}
-
-// Die with an error message if we can't lseek to the right spot.
-off_t xlseek(int fd, off_t offset, int whence)
-{
- off_t off = lseek(fd, offset, whence);
- if (off == (off_t)-1) {
- if (whence == SEEK_SET)
- bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
- bb_perror_msg_and_die("lseek");
- }
- return off;
-}
-
-// Die with supplied filename if this FILE * has ferror set.
-void die_if_ferror(FILE *fp, const char *fn)
-{
- if (ferror(fp)) {
- /* ferror doesn't set useful errno */
- bb_error_msg_and_die("%s: I/O error", fn);
- }
-}
-
-// Die with an error message if stdout has ferror set.
-void die_if_ferror_stdout(void)
-{
- die_if_ferror(stdout, bb_msg_standard_output);
-}
+#include "libbb.h"
-// Die with an error message if we have trouble flushing stdout.
-void xfflush_stdout(void)
+/* Turn on nonblocking I/O on a fd */
+int FAST_FUNC ndelay_on(int fd)
{
- if (fflush(stdout)) {
- bb_perror_msg_and_die(bb_msg_standard_output);
- }
+ return fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
}
-void sig_block(int sig)
+int FAST_FUNC ndelay_off(int fd)
{
- sigset_t ss;
- sigemptyset(&ss);
- sigaddset(&ss, sig);
- sigprocmask(SIG_BLOCK, &ss, NULL);
+ return fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NONBLOCK);
}
-void sig_unblock(int sig)
+int FAST_FUNC close_on_exec_on(int fd)
{
- sigset_t ss;
- sigemptyset(&ss);
- sigaddset(&ss, sig);
- sigprocmask(SIG_UNBLOCK, &ss, NULL);
+ return fcntl(fd, F_SETFD, FD_CLOEXEC);
}
-#if 0
-void sig_blocknone(void)
+char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
{
- sigset_t ss;
- sigemptyset(&ss);
- sigprocmask(SIG_SETMASK, &ss, NULL);
-}
+#ifndef IFNAMSIZ
+ enum { IFNAMSIZ = 16 };
#endif
-
-void sig_catch(int sig, void (*f)(int))
-{
- struct sigaction sa;
- sa.sa_handler = f;
- sa.sa_flags = 0;
- sigemptyset(&sa.sa_mask);
- sigaction(sig, &sa, NULL);
+ return strncpy(dst, src, IFNAMSIZ);
}
-void sig_pause(void)
-{
- sigset_t ss;
- sigemptyset(&ss);
- sigsuspend(&ss);
-}
-
-
-void xsetenv(const char *key, const char *value)
-{
- if (setenv(key, value, 1))
- bb_error_msg_and_die(bb_msg_memory_exhausted);
-}
-
-// Converts unsigned long long value into compact 4-char
-// representation. Examples: "1234", "1.2k", " 27M", "123T"
-// Fifth char is always '\0'
-void smart_ulltoa5(unsigned long long ul, char buf[5])
-{
- const char *fmt;
- char c;
- unsigned v,idx = 0;
- ul *= 10;
- if (ul > 9999*10) { // do not scale if 9999 or less
- while (ul >= 10000) {
- ul /= 1024;
- idx++;
- }
- }
- v = ul; // ullong divisions are expensive, avoid them
-
- fmt = " 123456789";
- if (!idx) { // 9999 or less: use 1234 format
- c = buf[0] = " 123456789"[v/10000];
- if (c != ' ') fmt = "0123456789";
- c = buf[1] = fmt[v/1000%10];
- if (c != ' ') fmt = "0123456789";
- buf[2] = fmt[v/100%10];
- buf[3] = "0123456789"[v/10%10];
- } else {
- if (v >= 10*10) { // scaled value is >=10: use 123M format
- c = buf[0] = " 123456789"[v/1000];
- if (c != ' ') fmt = "0123456789";
- buf[1] = fmt[v/100%10];
- buf[2] = "0123456789"[v/10%10];
- } else { // scaled value is <10: use 1.2M format
- buf[0] = "0123456789"[v/10];
- buf[1] = '.';
- buf[2] = "0123456789"[v%10];
- }
- // see http://en.wikipedia.org/wiki/Tera
- buf[3] = " kMGTPEZY"[idx];
- }
- buf[4] = '\0';
-}
// Convert unsigned integer to ascii, writing into supplied buffer.
// A truncated result contains the first few digits of the result ala strncpy.
// Returns a pointer past last generated digit, does _not_ store NUL.
void BUG_sizeof_unsigned_not_4(void);
-char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
+char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
{
unsigned i, out, res;
if (sizeof(unsigned) != 4)
return buf;
}
-// Convert signed integer to ascii, like utoa_to_buf()
-char *itoa_to_buf(int n, char *buf, unsigned buflen)
+/* Convert signed integer to ascii, like utoa_to_buf() */
+char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
{
- if (buflen && n<0) {
+ if (buflen && n < 0) {
n = -n;
*buf++ = '-';
buflen--;
// second time will overwrite previous results.
//
// The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
-// Int should always be 32 bits on any remotely Unix-like system, see
-// http://www.unix.org/whitepapers/64bit.html for the reasons why.
+// It so happens that sizeof(int) * 3 is enough for 32+ bits.
+// (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
-static char local_buf[12];
+static char local_buf[sizeof(int) * 3];
// Convert unsigned integer to ascii using a static buffer (returned).
-char *utoa(unsigned n)
+char* FAST_FUNC utoa(unsigned n)
{
*(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
return local_buf;
}
-// Convert signed integer to ascii using a static buffer (returned).
-char *itoa(int n)
+/* Convert signed integer to ascii using a static buffer (returned). */
+char* FAST_FUNC itoa(int n)
{
*(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
return local_buf;
}
-// Emit a string of hex representation of bytes
-char *bin2hex(char *p, const char *cp, int count)
+/* Emit a string of hex representation of bytes */
+char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
{
while (count) {
unsigned char c = *cp++;
return p;
}
-// Die with an error message if we can't set gid. (Because resource limits may
-// limit this user to a given number of processes, and if that fills up the
-// setgid() will fail and we'll _still_be_root_, which is bad.)
-void xsetgid(gid_t gid)
-{
- if (setgid(gid)) bb_perror_msg_and_die("setgid");
-}
-
-// Die with an error message if we can't set uid. (See xsetgid() for why.)
-void xsetuid(uid_t uid)
-{
- if (setuid(uid)) bb_perror_msg_and_die("setuid");
-}
-
-// Return how long the file at fd is, if there's any way to determine it.
-off_t fdlength(int fd)
+/* Return how long the file at fd is, if there's any way to determine it. */
+#ifdef UNUSED
+off_t FAST_FUNC fdlength(int fd)
{
off_t bottom = 0, top = 0, pos;
long size;
return pos + 1;
}
-
-// Die with an error message if we can't malloc() enough space and do an
-// sprintf() into that space.
-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_error_msg_and_die(bb_msg_memory_exhausted);
- return string_ptr;
-}
-
-#if 0 /* If we will ever meet a libc which hasn't [f]dprintf... */
-int fdprintf(int fd, 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) + 1;
- va_end(p);
- string_ptr = malloc(r);
- if (string_ptr) {
- va_start(p, format);
- r = vsnprintf(string_ptr, r, format, p);
- va_end(p);
- }
-#endif
-
- if (r >= 0) {
- full_write(fd, string_ptr, r);
- free(string_ptr);
- }
- return r;
-}
-#endif
-
-// Die with an error message if we can't copy an entire FILE * to stdout, then
-// close that file.
-void xprint_and_close_file(FILE *file)
-{
- fflush(stdout);
- // copyfd outputs error messages for us.
- if (bb_copyfd_eof(fileno(file), 1) == -1)
- xfunc_die();
-
- fclose(file);
-}
-
-// Die if we can't chdir to a new path.
-void xchdir(const char *path)
-{
- if (chdir(path))
- bb_perror_msg_and_die("chdir(%s)", path);
-}
-
-// Print a warning message if opendir() fails, but don't die.
-DIR *warn_opendir(const char *path)
-{
- DIR *dp;
-
- dp = opendir(path);
- if (!dp)
- bb_perror_msg("can't open '%s'", path);
- return dp;
-}
-
-// Die with an error message if opendir() fails.
-DIR *xopendir(const char *path)
-{
- DIR *dp;
-
- dp = opendir(path);
- if (!dp)
- bb_perror_msg_and_die("can't open '%s'", path);
- return dp;
-}
-
-// Die with an error message if we can't open a new socket.
-int xsocket(int domain, int type, int protocol)
-{
- int r = socket(domain, type, protocol);
-
- if (r < 0) {
- /* Hijack vaguely related config option */
-#if ENABLE_VERBOSE_RESOLUTION_ERRORS
- const char *s = "INET";
- if (domain == AF_PACKET) s = "PACKET";
- if (domain == AF_NETLINK) s = "NETLINK";
-USE_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";)
- bb_perror_msg_and_die("socket(AF_%s)", s);
-#else
- bb_perror_msg_and_die("socket");
#endif
- }
-
- return r;
-}
-
-// Die with an error message if we can't bind a socket to an address.
-void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
-{
- if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
-}
-
-// Die with an error message if we can't listen for connections on a socket.
-void xlisten(int s, int backlog)
-{
- if (listen(s, backlog)) bb_perror_msg_and_die("listen");
-}
-
-/* Die with an error message if sendto failed.
- * Return bytes sent otherwise */
-ssize_t xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
- socklen_t tolen)
-{
- ssize_t ret = sendto(s, buf, len, 0, to, tolen);
- if (ret < 0) {
- if (ENABLE_FEATURE_CLEAN_UP)
- close(s);
- bb_perror_msg_and_die("sendto");
- }
- return ret;
-}
-
-// xstat() - a stat() which dies on failure with meaningful error message
-void xstat(const char *name, struct stat *stat_buf)
-{
- if (stat(name, stat_buf))
- bb_perror_msg_and_die("can't stat '%s'", name);
-}
-// selinux_or_die() - die if SELinux is disabled.
-void selinux_or_die(void)
+char* FAST_FUNC xmalloc_ttyname(int fd)
{
-#if ENABLE_SELINUX
- int rc = is_selinux_enabled();
- if (rc == 0) {
- bb_error_msg_and_die("SELinux is disabled");
- } else if (rc < 0) {
- bb_error_msg_and_die("is_selinux_enabled() failed");
+ char *buf = xzalloc(128);
+ int r = ttyname_r(fd, buf, 127);
+ if (r) {
+ free(buf);
+ buf = NULL;
}
-#else
- bb_error_msg_and_die("SELinux support is disabled");
-#endif
+ return buf;
}
/* It is perfectly ok to pass in a NULL for either width or for
* height, in which case that value will not be set. */
-int get_terminal_width_height(int fd, int *width, int *height)
+int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
{
struct winsize win = { 0, 0, 0, 0 };
int ret = ioctl(fd, TIOCGWINSZ, &win);
return ret;
}
-void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...)
-{
- va_list p;
-
- if (ioctl(fd, request, argp) < 0) {
- va_start(p, fmt);
- bb_verror_msg(fmt, p, strerror(errno));
- /* xfunc_die can actually longjmp, so be nice */
- va_end(p);
- xfunc_die();
+int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
+{
+ return tcsetattr(STDIN_FILENO, TCSANOW, tp);
+}
+
+void FAST_FUNC generate_uuid(uint8_t *buf)
+{
+ /* http://www.ietf.org/rfc/rfc4122.txt
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | time_low |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | time_mid | time_hi_and_version |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |clk_seq_and_variant | node (0-1) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | node (2-5) |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * IOW, uuid has this layout:
+ * uint32_t time_low (big endian)
+ * uint16_t time_mid (big endian)
+ * uint16_t time_hi_and_version (big endian)
+ * version is a 4-bit field:
+ * 1 Time-based
+ * 2 DCE Security, with embedded POSIX UIDs
+ * 3 Name-based (MD5)
+ * 4 Randomly generated
+ * 5 Name-based (SHA-1)
+ * uint16_t clk_seq_and_variant (big endian)
+ * variant is a 3-bit field:
+ * 0xx Reserved, NCS backward compatibility
+ * 10x The variant specified in rfc4122
+ * 110 Reserved, Microsoft backward compatibility
+ * 111 Reserved for future definition
+ * uint8_t node[6]
+ *
+ * For version 4, these bits are set/cleared:
+ * time_hi_and_version & 0x0fff | 0x4000
+ * clk_seq_and_variant & 0x3fff | 0x8000
+ */
+ pid_t pid;
+ int i;
+
+ i = open("/dev/urandom", O_RDONLY);
+ if (i >= 0) {
+ read(i, buf, 16);
+ close(i);
}
-}
-
-int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...)
-{
- va_list p;
- int ret = ioctl(fd, request, argp);
-
- if (ret < 0) {
- va_start(p, fmt);
- bb_verror_msg(fmt, p, strerror(errno));
- va_end(p);
+ /* Paranoia. /dev/urandom may be missing.
+ * rand() is guaranteed to generate at least [0, 2^15) range,
+ * but lowest bits in some libc are not so "random". */
+ srand(monotonic_us());
+ pid = getpid();
+ while (1) {
+ for (i = 0; i < 16; i++)
+ buf[i] ^= rand() >> 5;
+ if (pid == 0)
+ break;
+ srand(pid);
+ pid = 0;
}
- return ret;
-}
-
-#if ENABLE_IOCTL_HEX2STR_ERROR
-int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name)
-{
- int ret;
- ret = ioctl(fd, request, argp);
- if (ret < 0)
- bb_perror_msg("%s", ioctl_name);
- return ret;
-}
-void bb_xioctl(int fd, int request, void *argp, const char *ioctl_name)
-{
- if (ioctl(fd, request, argp) < 0)
- bb_perror_msg_and_die("%s", ioctl_name);
-}
-#else
-int bb_ioctl_or_warn(int fd, int request, void *argp)
-{
- int ret;
-
- ret = ioctl(fd, request, argp);
- if (ret < 0)
- bb_perror_msg("ioctl %#x failed", request);
- return ret;
+ /* version = 4 */
+ buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
+ /* variant = 10x */
+ buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
}
-void bb_xioctl(int fd, int request, void *argp)
-{
- if (ioctl(fd, request, argp) < 0)
- bb_perror_msg_and_die("ioctl %#x failed", request);
-}
-#endif
projects / oweals / busybox.git / blobdiff