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-rw-r--r--libbb/xfuncs.c73
1 files changed, 2 insertions, 71 deletions
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index d93dd2af9..6200fc600 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -199,15 +199,9 @@ off_t FAST_FUNC fdlength(int fd)
199} 199}
200#endif 200#endif
201 201
202char* FAST_FUNC xmalloc_ttyname(int fd) 202int FAST_FUNC bb_putchar_stderr(char ch)
203{ 203{
204 char *buf = xzalloc(128); 204 return write(STDERR_FILENO, &ch, 1);
205 int r = ttyname_r(fd, buf, 127);
206 if (r) {
207 free(buf);
208 buf = NULL;
209 }
210 return buf;
211} 205}
212 206
213static int wh_helper(int value, int def_val, const char *env_name, int *err) 207static int wh_helper(int value, int def_val, const char *env_name, int *err)
@@ -250,66 +244,3 @@ int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
250{ 244{
251 return tcsetattr(STDIN_FILENO, TCSANOW, tp); 245 return tcsetattr(STDIN_FILENO, TCSANOW, tp);
252} 246}
253
254void FAST_FUNC generate_uuid(uint8_t *buf)
255{
256 /* http://www.ietf.org/rfc/rfc4122.txt
257 * 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
258 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
259 * | time_low |
260 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
261 * | time_mid | time_hi_and_version |
262 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
263 * |clk_seq_and_variant | node (0-1) |
264 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
265 * | node (2-5) |
266 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
267 * IOW, uuid has this layout:
268 * uint32_t time_low (big endian)
269 * uint16_t time_mid (big endian)
270 * uint16_t time_hi_and_version (big endian)
271 * version is a 4-bit field:
272 * 1 Time-based
273 * 2 DCE Security, with embedded POSIX UIDs
274 * 3 Name-based (MD5)
275 * 4 Randomly generated
276 * 5 Name-based (SHA-1)
277 * uint16_t clk_seq_and_variant (big endian)
278 * variant is a 3-bit field:
279 * 0xx Reserved, NCS backward compatibility
280 * 10x The variant specified in rfc4122
281 * 110 Reserved, Microsoft backward compatibility
282 * 111 Reserved for future definition
283 * uint8_t node[6]
284 *
285 * For version 4, these bits are set/cleared:
286 * time_hi_and_version & 0x0fff | 0x4000
287 * clk_seq_and_variant & 0x3fff | 0x8000
288 */
289 pid_t pid;
290 int i;
291
292 i = open("/dev/urandom", O_RDONLY);
293 if (i >= 0) {
294 read(i, buf, 16);
295 close(i);
296 }
297 /* Paranoia. /dev/urandom may be missing.
298 * rand() is guaranteed to generate at least [0, 2^15) range,
299 * but lowest bits in some libc are not so "random". */
300 srand(monotonic_us());
301 pid = getpid();
302 while (1) {
303 for (i = 0; i < 16; i++)
304 buf[i] ^= rand() >> 5;
305 if (pid == 0)
306 break;
307 srand(pid);
308 pid = 0;
309 }
310
311 /* version = 4 */
312 buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
313 /* variant = 10x */
314 buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
315}