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authorDenys Vlasenko <vda.linux@googlemail.com>2010-06-06 21:53:09 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2010-06-06 21:53:09 +0200
commit19ced5c4253bc154aa499a72b6343e01245c92c0 (patch)
treec1c148612896e748749ce882ed25ad5ffd74418c /libbb/xfuncs_printf.c
parent5f3303712ef483d270097cae4ba0a559b1056121 (diff)
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pipe_progress: make it independent of printf machinery
function old new delta bb_putchar_stderr - 24 +24 ParseField 494 471 -23 progress_meter 212 188 -24 xargs_main 888 842 -46 pipe_progress_main 151 105 -46 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 0/4 up/down: 24/-139) Total: -115 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/xfuncs_printf.c')
-rw-r--r--libbb/xfuncs_printf.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index 7207ec58a..03aeaaa38 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -510,3 +510,77 @@ int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp)
510 return ret; 510 return ret;
511} 511}
512#endif 512#endif
513
514char* FAST_FUNC xmalloc_ttyname(int fd)
515{
516 char *buf = xzalloc(128);
517 int r = ttyname_r(fd, buf, 127);
518 if (r) {
519 free(buf);
520 buf = NULL;
521 }
522 return buf;
523}
524
525void FAST_FUNC generate_uuid(uint8_t *buf)
526{
527 /* http://www.ietf.org/rfc/rfc4122.txt
528 * 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
529 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
530 * | time_low |
531 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
532 * | time_mid | time_hi_and_version |
533 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
534 * |clk_seq_and_variant | node (0-1) |
535 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
536 * | node (2-5) |
537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
538 * IOW, uuid has this layout:
539 * uint32_t time_low (big endian)
540 * uint16_t time_mid (big endian)
541 * uint16_t time_hi_and_version (big endian)
542 * version is a 4-bit field:
543 * 1 Time-based
544 * 2 DCE Security, with embedded POSIX UIDs
545 * 3 Name-based (MD5)
546 * 4 Randomly generated
547 * 5 Name-based (SHA-1)
548 * uint16_t clk_seq_and_variant (big endian)
549 * variant is a 3-bit field:
550 * 0xx Reserved, NCS backward compatibility
551 * 10x The variant specified in rfc4122
552 * 110 Reserved, Microsoft backward compatibility
553 * 111 Reserved for future definition
554 * uint8_t node[6]
555 *
556 * For version 4, these bits are set/cleared:
557 * time_hi_and_version & 0x0fff | 0x4000
558 * clk_seq_and_variant & 0x3fff | 0x8000
559 */
560 pid_t pid;
561 int i;
562
563 i = open("/dev/urandom", O_RDONLY);
564 if (i >= 0) {
565 read(i, buf, 16);
566 close(i);
567 }
568 /* Paranoia. /dev/urandom may be missing.
569 * rand() is guaranteed to generate at least [0, 2^15) range,
570 * but lowest bits in some libc are not so "random". */
571 srand(monotonic_us()); /* pulls in printf */
572 pid = getpid();
573 while (1) {
574 for (i = 0; i < 16; i++)
575 buf[i] ^= rand() >> 5;
576 if (pid == 0)
577 break;
578 srand(pid);
579 pid = 0;
580 }
581
582 /* version = 4 */
583 buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
584 /* variant = 10x */
585 buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
586}