*
* 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 "busybox.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.
*/
-// 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 */
+#include "libbb.h"
-// Die if we can't allocate and zero size bytes of memory.
-void *xzalloc(size_t size)
+/* Turn on nonblocking I/O on a fd */
+int FAST_FUNC ndelay_on(int fd)
{
- void *ptr = xmalloc(size);
- memset(ptr, 0, size);
- return ptr;
+ return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK);
}
-// Die if we can't copy a string to freshly allocated memory.
-char * xstrdup(const char *s)
+int FAST_FUNC ndelay_off(int fd)
{
- char *t;
-
- if (s == NULL)
- return NULL;
-
- t = strdup(s);
-
- if (t == NULL)
- bb_error_msg_and_die(bb_msg_memory_exhausted);
-
- return t;
+ return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK);
}
-// 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 FAST_FUNC close_on_exec_on(int fd)
{
- 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 = n - m;
- t = xmalloc(n + 1);
- t[n] = '\0';
-
- return memcpy(t,s,n);
+ return fcntl(fd, F_SETFD, FD_CLOEXEC);
}
-// 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)
+/* Convert unsigned long long value into compact 4-char
+ * representation. Examples: "1234", "1.2k", " 27M", "123T"
+ * String is not terminated (buf[4] is untouched) */
+void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)
{
- FILE *fp = fopen(path, mode);
- if (fp == NULL)
- bb_perror_msg_and_die("%s", path);
- return fp;
-}
-
-// Die if we can't open an existing file and return an fd.
-int xopen(const char *pathname, int flags)
-{
- //if (ENABLE_DEBUG && (flags & O_CREAT))
- // bb_error_msg_and_die("xopen() with O_CREAT");
-
- return xopen3(pathname, flags, 0666);
-}
-
-// Die if we can't open a new file and return an 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("%s", pathname);
- }
- return ret;
-}
-
-/*
-int ndelay_off(int fd)
-{
- return fcntl(fd,F_SETFL,fcntl(fd,F_GETFL,0) & ~O_NONBLOCK);
-}
-*/
-// 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);
-}
-
-// 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)
- 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)) {
- 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);
-}
+ const char *fmt;
+ char c;
+ unsigned v, u, idx = 0;
-// Die with an error message if we have trouble flushing stdout.
-void xfflush_stdout(void)
-{
- if (fflush(stdout)) {
- bb_perror_msg_and_die(bb_msg_standard_output);
+ if (ul > 9999) { // do not scale if 9999 or less
+ ul *= 10;
+ do {
+ ul /= 1024;
+ idx++;
+ } while (ul >= 10000);
}
-}
+ v = ul; // ullong divisions are expensive, avoid them
-// This does a fork/exec in one call, using vfork(). Return PID of new child,
-// -1 for failure. Runs argv[0], searching path if that has no / in it.
-pid_t spawn(char **argv)
-{
- static int failed;
- pid_t pid;
- void *app = ENABLE_FEATURE_SH_STANDALONE_SHELL ? find_applet_by_name(argv[0]) : 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);
+ fmt = " 123456789";
+ u = v / 10;
+ v = v % 10;
+ if (!idx) {
+ // 9999 or less: use "1234" format
+ // u is value/10, v is last digit
+ c = buf[0] = " 123456789"[u/100];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[1] = fmt[u/10%10];
+ if (c != ' ') fmt = "0123456789";
+ buf[2] = fmt[u%10];
+ buf[3] = "0123456789"[v];
+ } else {
+ // u is value, v is 1/10ths (allows for 9.2M format)
+ if (u >= 10) {
+ // value is >= 10: use "123M', " 12M" formats
+ c = buf[0] = " 123456789"[u/100];
+ if (c != ' ') fmt = "0123456789";
+ v = u % 10;
+ u = u / 10;
+ buf[1] = fmt[u%10];
+ } else {
+ // value is < 10: use "9.2M" format
+ buf[0] = "0123456789"[u];
+ buf[1] = '.';
+ }
+ buf[2] = "0123456789"[v];
+ buf[3] = scale[idx]; /* typically scale = " kmgt..." */
}
- return failed ? failed : pid;
}
-// Die with an error message if we can't spawn a child process.
-pid_t xspawn(char **argv)
+/* Convert unsigned long long value into compact 5-char representation.
+ * String is not terminated (buf[5] is untouched) */
+void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[6], const char *scale)
{
- pid_t pid = spawn(argv);
- if (pid < 0) bb_perror_msg_and_die("%s", *argv);
- return pid;
-}
-
-// Wait for the specified child PID to exit, returning child's error return.
-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;
-}
-
-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])
-{
- char *fmt;
+ 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) {
+ unsigned v, u, idx = 0;
+
+ if (ul > 99999) { // do not scale if 99999 or less
+ ul *= 10;
+ do {
ul /= 1024;
idx++;
- }
+ } while (ul >= 100000);
}
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];
+ u = v / 10;
+ v = v % 10;
+ if (!idx) {
+ // 99999 or less: use "12345" format
+ // u is value/10, v is last digit
+ c = buf[0] = " 123456789"[u/1000];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[1] = fmt[u/100%10];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[2] = fmt[u/10%10];
+ if (c != ' ') fmt = "0123456789";
+ buf[3] = fmt[u%10];
+ buf[4] = "0123456789"[v];
} 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];
+ // value has been scaled into 0..9999.9 range
+ // u is value, v is 1/10ths (allows for 92.1M format)
+ if (u >= 100) {
+ // value is >= 100: use "1234M', " 123M" formats
+ c = buf[0] = " 123456789"[u/1000];
+ if (c != ' ') fmt = "0123456789";
+ c = buf[1] = fmt[u/100%10];
+ if (c != ' ') fmt = "0123456789";
+ v = u % 10;
+ u = u / 10;
+ buf[2] = fmt[u%10];
+ } else {
+ // value is < 100: use "92.1M" format
+ c = buf[0] = " 123456789"[u/10];
+ if (c != ' ') fmt = "0123456789";
+ buf[1] = fmt[u%10];
+ buf[2] = '.';
}
- // see http://en.wikipedia.org/wiki/Tera
- buf[3] = " kMGTPEZY"[idx];
+ buf[3] = "0123456789"[v];
+ buf[4] = scale[idx]; /* typically scale = " kmgt..." */
}
- buf[4] = '\0';
}
-// Convert unsigned integer to ascii, writing into supplied buffer. A
-// truncated result is always null terminated (unless buflen is 0), and
-// contains the first few digits of the result ala strncpy.
+
+// 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);
-void 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)
*buf++ = '0' + res;
}
}
- *buf = '\0';
}
+ return buf;
}
-// Convert signed integer to ascii, like utoa_to_buf()
-void 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--;
}
- utoa_to_buf((unsigned)n, buf, buflen);
+ return utoa_to_buf((unsigned)n, buf, buflen);
}
// The following two functions use a static buffer, so calling either one a
// 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));
+ *(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));
+ *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
return local_buf;
}
-// 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)
+/* Emit a string of hex representation of bytes */
+char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
{
- if (setgid(gid)) bb_error_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_error_msg_and_die("setuid");
+ while (count) {
+ unsigned char c = *cp++;
+ /* put lowercase hex digits */
+ *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
+ *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
+ count--;
+ }
+ return p;
}
-// 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;
-}
-
-// 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)
- exit(xfunc_error_retval);
-
- 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;
-
- if ((dp = opendir(path)) == NULL) {
- bb_perror_msg("cannot open '%s'", path);
- return NULL;
- }
- return dp;
-}
-
-// Die with an error message if opendir() fails.
-DIR *xopendir(const char *path)
-{
- DIR *dp;
-
- if ((dp = opendir(path)) == NULL)
- bb_perror_msg_and_die("cannot open '%s'", path);
- return dp;
-}
-
-#ifndef BB_NOMMU
-// Die with an error message if we can't daemonize.
-void xdaemon(int nochdir, int noclose)
-{
- if (daemon(nochdir, noclose))
- bb_perror_msg_and_die("daemon");
-}
-#endif
-
-// 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) bb_perror_msg_and_die("socket");
-
- 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");
-}
-
-// xstat() - a stat() which dies on failure with meaningful error message
-void xstat(char *name, struct stat *stat_buf)
-{
- if (stat(name, stat_buf))
- bb_perror_msg_and_die("can't stat '%s'", name);
-}
-
/* 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);
projects / oweals / busybox.git / blobdiff