Diff of /trunk/mkinitrd-magellan/busybox/libbb/xfuncs.c

Parent Directory | Revision Log | Patch

	revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 27	Line 27
27	/* Turn on nonblocking I/O on a fd */	/* Turn on nonblocking I/O on a fd */
28	int FAST_FUNC ndelay_on(int fd)	int FAST_FUNC ndelay_on(int fd)
29	{	{
30	return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK);	return fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
31	}	}
32
33	int FAST_FUNC ndelay_off(int fd)	int FAST_FUNC ndelay_off(int fd)
34	{	{
35	return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK);	return fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NONBLOCK);
36	}	}
37
38	int FAST_FUNC close_on_exec_on(int fd)	int FAST_FUNC close_on_exec_on(int fd)
#	Line 40  int FAST_FUNC close_on_exec_on(int fd)	Line 40  int FAST_FUNC close_on_exec_on(int fd)
40	return fcntl(fd, F_SETFD, FD_CLOEXEC);	return fcntl(fd, F_SETFD, FD_CLOEXEC);
41	}	}
42
43	/* Convert unsigned long long value into compact 4-char	char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
44	* representation. Examples: "1234", "1.2k", " 27M", "123T"	{
45	* String is not terminated (buf[4] is untouched) */	#ifndef IFNAMSIZ
46	void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale)	enum { IFNAMSIZ = 16 };
47	{	#endif
48	const char *fmt;	return strncpy(dst, src, IFNAMSIZ);
	char c;
	unsigned v, u, idx = 0;
	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
	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..." */
	}
	}
	/* 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)
	{
	const char *fmt;
	char c;
	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";
	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 {
	// 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] = '.';
	}
	buf[3] = "0123456789"[v];
	buf[4] = scale[idx]; /* typically scale = " kmgt..." */
	}
49	}	}
50
51
#	Line 260  off_t FAST_FUNC fdlength(int fd)	Line 164  off_t FAST_FUNC fdlength(int fd)
164	}	}
165	#endif	#endif
166
167		char* FAST_FUNC xmalloc_ttyname(int fd)
168		{
169		char *buf = xzalloc(128);
170		int r = ttyname_r(fd, buf, 127);
171		if (r) {
172		free(buf);
173		buf = NULL;
174		}
175		return buf;
176		}
177
178	/* It is perfectly ok to pass in a NULL for either width or for	/* It is perfectly ok to pass in a NULL for either width or for
179	* height, in which case that value will not be set.  */	* height, in which case that value will not be set.  */
180	int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)	int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
#	Line 294  int FAST_FUNC tcsetattr_stdin_TCSANOW(co	Line 209  int FAST_FUNC tcsetattr_stdin_TCSANOW(co
209	{	{
210	return tcsetattr(STDIN_FILENO, TCSANOW, tp);	return tcsetattr(STDIN_FILENO, TCSANOW, tp);
211	}	}
212
213		void FAST_FUNC generate_uuid(uint8_t *buf)
214		{
215		/* http://www.ietf.org/rfc/rfc4122.txt
216		*  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
217		* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
218		* |                          time_low                             |
219		* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
220		* |       time_mid                |         time_hi_and_version   |
221		* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222		* |clk_seq_and_variant            |         node (0-1)            |
223		* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
224		* |                         node (2-5)                            |
225		* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
226		* IOW, uuid has this layout:
227		* uint32_t time_low (big endian)
228		* uint16_t time_mid (big endian)
229		* uint16_t time_hi_and_version (big endian)
230		*  version is a 4-bit field:
231		*   1 Time-based
232		*   2 DCE Security, with embedded POSIX UIDs
233		*   3 Name-based (MD5)
234		*   4 Randomly generated
235		*   5 Name-based (SHA-1)
236		* uint16_t clk_seq_and_variant (big endian)
237		*  variant is a 3-bit field:
238		*   0xx Reserved, NCS backward compatibility
239		*   10x The variant specified in rfc4122
240		*   110 Reserved, Microsoft backward compatibility
241		*   111 Reserved for future definition
242		* uint8_t node[6]
243		*
244		* For version 4, these bits are set/cleared:
245		* time_hi_and_version & 0x0fff | 0x4000
246		* clk_seq_and_variant & 0x3fff | 0x8000
247		*/
248		pid_t pid;
249		int i;
250
251		i = open("/dev/urandom", O_RDONLY);
252		if (i >= 0) {
253		read(i, buf, 16);
254		close(i);
255		}
256		/* Paranoia. /dev/urandom may be missing.
257		* rand() is guaranteed to generate at least [0, 2^15) range,
258		* but lowest bits in some libc are not so "random".  */
259		srand(monotonic_us());
260		pid = getpid();
261		while (1) {
262		for (i = 0; i < 16; i++)
263		buf[i] ^= rand() >> 5;
264		if (pid == 0)
265		break;
266		srand(pid);
267		pid = 0;
268		}
269
270		/* version = 4 */
271		buf[4 + 2    ] = (buf[4 + 2    ] & 0x0f) | 0x40;
272		/* variant = 10x */
273		buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
274		}

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Legend: Removed from v.983   changed lines   Added in v.984