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authorIngo Molnar <mingo@elte.hu>2009-04-07 05:15:40 -0400
committerIngo Molnar <mingo@elte.hu>2009-04-07 05:15:40 -0400
commit5e34437840d33554f69380584311743b39e8fbeb (patch)
treee081135619ee146af5efb9ee883afca950df5757 /lib/vsprintf.c
parent77d05632baee21b1cef8730d7c06aa69601e4dca (diff)
parentd508afb437daee7cf07da085b635c44a4ebf9b38 (diff)
Merge branch 'linus' into core/softlockup
Conflicts: kernel/sysctl.c
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c1005
1 files changed, 778 insertions, 227 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 0fbd0121d91d..be3001f912e4 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -396,7 +396,38 @@ static noinline char* put_dec(char *buf, unsigned long long num)
396#define SMALL 32 /* Must be 32 == 0x20 */ 396#define SMALL 32 /* Must be 32 == 0x20 */
397#define SPECIAL 64 /* 0x */ 397#define SPECIAL 64 /* 0x */
398 398
399static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type) 399enum format_type {
400 FORMAT_TYPE_NONE, /* Just a string part */
401 FORMAT_TYPE_WIDTH,
402 FORMAT_TYPE_PRECISION,
403 FORMAT_TYPE_CHAR,
404 FORMAT_TYPE_STR,
405 FORMAT_TYPE_PTR,
406 FORMAT_TYPE_PERCENT_CHAR,
407 FORMAT_TYPE_INVALID,
408 FORMAT_TYPE_LONG_LONG,
409 FORMAT_TYPE_ULONG,
410 FORMAT_TYPE_LONG,
411 FORMAT_TYPE_USHORT,
412 FORMAT_TYPE_SHORT,
413 FORMAT_TYPE_UINT,
414 FORMAT_TYPE_INT,
415 FORMAT_TYPE_NRCHARS,
416 FORMAT_TYPE_SIZE_T,
417 FORMAT_TYPE_PTRDIFF
418};
419
420struct printf_spec {
421 enum format_type type;
422 int flags; /* flags to number() */
423 int field_width; /* width of output field */
424 int base;
425 int precision; /* # of digits/chars */
426 int qualifier;
427};
428
429static char *number(char *buf, char *end, unsigned long long num,
430 struct printf_spec spec)
400{ 431{
401 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ 432 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
402 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ 433 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
@@ -404,32 +435,32 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
404 char tmp[66]; 435 char tmp[66];
405 char sign; 436 char sign;
406 char locase; 437 char locase;
407 int need_pfx = ((type & SPECIAL) && base != 10); 438 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
408 int i; 439 int i;
409 440
410 /* locase = 0 or 0x20. ORing digits or letters with 'locase' 441 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
411 * produces same digits or (maybe lowercased) letters */ 442 * produces same digits or (maybe lowercased) letters */
412 locase = (type & SMALL); 443 locase = (spec.flags & SMALL);
413 if (type & LEFT) 444 if (spec.flags & LEFT)
414 type &= ~ZEROPAD; 445 spec.flags &= ~ZEROPAD;
415 sign = 0; 446 sign = 0;
416 if (type & SIGN) { 447 if (spec.flags & SIGN) {
417 if ((signed long long) num < 0) { 448 if ((signed long long) num < 0) {
418 sign = '-'; 449 sign = '-';
419 num = - (signed long long) num; 450 num = - (signed long long) num;
420 size--; 451 spec.field_width--;
421 } else if (type & PLUS) { 452 } else if (spec.flags & PLUS) {
422 sign = '+'; 453 sign = '+';
423 size--; 454 spec.field_width--;
424 } else if (type & SPACE) { 455 } else if (spec.flags & SPACE) {
425 sign = ' '; 456 sign = ' ';
426 size--; 457 spec.field_width--;
427 } 458 }
428 } 459 }
429 if (need_pfx) { 460 if (need_pfx) {
430 size--; 461 spec.field_width--;
431 if (base == 16) 462 if (spec.base == 16)
432 size--; 463 spec.field_width--;
433 } 464 }
434 465
435 /* generate full string in tmp[], in reverse order */ 466 /* generate full string in tmp[], in reverse order */
@@ -441,10 +472,10 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
441 tmp[i++] = (digits[do_div(num,base)] | locase); 472 tmp[i++] = (digits[do_div(num,base)] | locase);
442 } while (num != 0); 473 } while (num != 0);
443 */ 474 */
444 else if (base != 10) { /* 8 or 16 */ 475 else if (spec.base != 10) { /* 8 or 16 */
445 int mask = base - 1; 476 int mask = spec.base - 1;
446 int shift = 3; 477 int shift = 3;
447 if (base == 16) shift = 4; 478 if (spec.base == 16) shift = 4;
448 do { 479 do {
449 tmp[i++] = (digits[((unsigned char)num) & mask] | locase); 480 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
450 num >>= shift; 481 num >>= shift;
@@ -454,12 +485,12 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
454 } 485 }
455 486
456 /* printing 100 using %2d gives "100", not "00" */ 487 /* printing 100 using %2d gives "100", not "00" */
457 if (i > precision) 488 if (i > spec.precision)
458 precision = i; 489 spec.precision = i;
459 /* leading space padding */ 490 /* leading space padding */
460 size -= precision; 491 spec.field_width -= spec.precision;
461 if (!(type & (ZEROPAD+LEFT))) { 492 if (!(spec.flags & (ZEROPAD+LEFT))) {
462 while(--size >= 0) { 493 while(--spec.field_width >= 0) {
463 if (buf < end) 494 if (buf < end)
464 *buf = ' '; 495 *buf = ' ';
465 ++buf; 496 ++buf;
@@ -476,23 +507,23 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
476 if (buf < end) 507 if (buf < end)
477 *buf = '0'; 508 *buf = '0';
478 ++buf; 509 ++buf;
479 if (base == 16) { 510 if (spec.base == 16) {
480 if (buf < end) 511 if (buf < end)
481 *buf = ('X' | locase); 512 *buf = ('X' | locase);
482 ++buf; 513 ++buf;
483 } 514 }
484 } 515 }
485 /* zero or space padding */ 516 /* zero or space padding */
486 if (!(type & LEFT)) { 517 if (!(spec.flags & LEFT)) {
487 char c = (type & ZEROPAD) ? '0' : ' '; 518 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
488 while (--size >= 0) { 519 while (--spec.field_width >= 0) {
489 if (buf < end) 520 if (buf < end)
490 *buf = c; 521 *buf = c;
491 ++buf; 522 ++buf;
492 } 523 }
493 } 524 }
494 /* hmm even more zero padding? */ 525 /* hmm even more zero padding? */
495 while (i <= --precision) { 526 while (i <= --spec.precision) {
496 if (buf < end) 527 if (buf < end)
497 *buf = '0'; 528 *buf = '0';
498 ++buf; 529 ++buf;
@@ -504,7 +535,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
504 ++buf; 535 ++buf;
505 } 536 }
506 /* trailing space padding */ 537 /* trailing space padding */
507 while (--size >= 0) { 538 while (--spec.field_width >= 0) {
508 if (buf < end) 539 if (buf < end)
509 *buf = ' '; 540 *buf = ' ';
510 ++buf; 541 ++buf;
@@ -512,17 +543,17 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
512 return buf; 543 return buf;
513} 544}
514 545
515static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) 546static char *string(char *buf, char *end, char *s, struct printf_spec spec)
516{ 547{
517 int len, i; 548 int len, i;
518 549
519 if ((unsigned long)s < PAGE_SIZE) 550 if ((unsigned long)s < PAGE_SIZE)
520 s = "<NULL>"; 551 s = "<NULL>";
521 552
522 len = strnlen(s, precision); 553 len = strnlen(s, spec.precision);
523 554
524 if (!(flags & LEFT)) { 555 if (!(spec.flags & LEFT)) {
525 while (len < field_width--) { 556 while (len < spec.field_width--) {
526 if (buf < end) 557 if (buf < end)
527 *buf = ' '; 558 *buf = ' ';
528 ++buf; 559 ++buf;
@@ -533,7 +564,7 @@ static char *string(char *buf, char *end, char *s, int field_width, int precisio
533 *buf = *s; 564 *buf = *s;
534 ++buf; ++s; 565 ++buf; ++s;
535 } 566 }
536 while (len < field_width--) { 567 while (len < spec.field_width--) {
537 if (buf < end) 568 if (buf < end)
538 *buf = ' '; 569 *buf = ' ';
539 ++buf; 570 ++buf;
@@ -541,21 +572,24 @@ static char *string(char *buf, char *end, char *s, int field_width, int precisio
541 return buf; 572 return buf;
542} 573}
543 574
544static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags) 575static char *symbol_string(char *buf, char *end, void *ptr,
576 struct printf_spec spec)
545{ 577{
546 unsigned long value = (unsigned long) ptr; 578 unsigned long value = (unsigned long) ptr;
547#ifdef CONFIG_KALLSYMS 579#ifdef CONFIG_KALLSYMS
548 char sym[KSYM_SYMBOL_LEN]; 580 char sym[KSYM_SYMBOL_LEN];
549 sprint_symbol(sym, value); 581 sprint_symbol(sym, value);
550 return string(buf, end, sym, field_width, precision, flags); 582 return string(buf, end, sym, spec);
551#else 583#else
552 field_width = 2*sizeof(void *); 584 spec.field_width = 2*sizeof(void *);
553 flags |= SPECIAL | SMALL | ZEROPAD; 585 spec.flags |= SPECIAL | SMALL | ZEROPAD;
554 return number(buf, end, value, 16, field_width, precision, flags); 586 spec.base = 16;
587 return number(buf, end, value, spec);
555#endif 588#endif
556} 589}
557 590
558static char *resource_string(char *buf, char *end, struct resource *res, int field_width, int precision, int flags) 591static char *resource_string(char *buf, char *end, struct resource *res,
592 struct printf_spec spec)
559{ 593{
560#ifndef IO_RSRC_PRINTK_SIZE 594#ifndef IO_RSRC_PRINTK_SIZE
561#define IO_RSRC_PRINTK_SIZE 4 595#define IO_RSRC_PRINTK_SIZE 4
@@ -564,7 +598,11 @@ static char *resource_string(char *buf, char *end, struct resource *res, int fie
564#ifndef MEM_RSRC_PRINTK_SIZE 598#ifndef MEM_RSRC_PRINTK_SIZE
565#define MEM_RSRC_PRINTK_SIZE 8 599#define MEM_RSRC_PRINTK_SIZE 8
566#endif 600#endif
567 601 struct printf_spec num_spec = {
602 .base = 16,
603 .precision = -1,
604 .flags = SPECIAL | SMALL | ZEROPAD,
605 };
568 /* room for the actual numbers, the two "0x", -, [, ] and the final zero */ 606 /* room for the actual numbers, the two "0x", -, [, ] and the final zero */
569 char sym[4*sizeof(resource_size_t) + 8]; 607 char sym[4*sizeof(resource_size_t) + 8];
570 char *p = sym, *pend = sym + sizeof(sym); 608 char *p = sym, *pend = sym + sizeof(sym);
@@ -576,17 +614,18 @@ static char *resource_string(char *buf, char *end, struct resource *res, int fie
576 size = MEM_RSRC_PRINTK_SIZE; 614 size = MEM_RSRC_PRINTK_SIZE;
577 615
578 *p++ = '['; 616 *p++ = '[';
579 p = number(p, pend, res->start, 16, size, -1, SPECIAL | SMALL | ZEROPAD); 617 num_spec.field_width = size;
618 p = number(p, pend, res->start, num_spec);
580 *p++ = '-'; 619 *p++ = '-';
581 p = number(p, pend, res->end, 16, size, -1, SPECIAL | SMALL | ZEROPAD); 620 p = number(p, pend, res->end, num_spec);
582 *p++ = ']'; 621 *p++ = ']';
583 *p = 0; 622 *p = 0;
584 623
585 return string(buf, end, sym, field_width, precision, flags); 624 return string(buf, end, sym, spec);
586} 625}
587 626
588static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width, 627static char *mac_address_string(char *buf, char *end, u8 *addr,
589 int precision, int flags) 628 struct printf_spec spec)
590{ 629{
591 char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ 630 char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
592 char *p = mac_addr; 631 char *p = mac_addr;
@@ -594,16 +633,17 @@ static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
594 633
595 for (i = 0; i < 6; i++) { 634 for (i = 0; i < 6; i++) {
596 p = pack_hex_byte(p, addr[i]); 635 p = pack_hex_byte(p, addr[i]);
597 if (!(flags & SPECIAL) && i != 5) 636 if (!(spec.flags & SPECIAL) && i != 5)
598 *p++ = ':'; 637 *p++ = ':';
599 } 638 }
600 *p = '\0'; 639 *p = '\0';
640 spec.flags &= ~SPECIAL;
601 641
602 return string(buf, end, mac_addr, field_width, precision, flags & ~SPECIAL); 642 return string(buf, end, mac_addr, spec);
603} 643}
604 644
605static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width, 645static char *ip6_addr_string(char *buf, char *end, u8 *addr,
606 int precision, int flags) 646 struct printf_spec spec)
607{ 647{
608 char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ 648 char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
609 char *p = ip6_addr; 649 char *p = ip6_addr;
@@ -612,16 +652,17 @@ static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
612 for (i = 0; i < 8; i++) { 652 for (i = 0; i < 8; i++) {
613 p = pack_hex_byte(p, addr[2 * i]); 653 p = pack_hex_byte(p, addr[2 * i]);
614 p = pack_hex_byte(p, addr[2 * i + 1]); 654 p = pack_hex_byte(p, addr[2 * i + 1]);
615 if (!(flags & SPECIAL) && i != 7) 655 if (!(spec.flags & SPECIAL) && i != 7)
616 *p++ = ':'; 656 *p++ = ':';
617 } 657 }
618 *p = '\0'; 658 *p = '\0';
659 spec.flags &= ~SPECIAL;
619 660
620 return string(buf, end, ip6_addr, field_width, precision, flags & ~SPECIAL); 661 return string(buf, end, ip6_addr, spec);
621} 662}
622 663
623static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width, 664static char *ip4_addr_string(char *buf, char *end, u8 *addr,
624 int precision, int flags) 665 struct printf_spec spec)
625{ 666{
626 char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */ 667 char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
627 char temp[3]; /* hold each IP quad in reverse order */ 668 char temp[3]; /* hold each IP quad in reverse order */
@@ -637,8 +678,9 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
637 *p++ = '.'; 678 *p++ = '.';
638 } 679 }
639 *p = '\0'; 680 *p = '\0';
681 spec.flags &= ~SPECIAL;
640 682
641 return string(buf, end, ip4_addr, field_width, precision, flags & ~SPECIAL); 683 return string(buf, end, ip4_addr, spec);
642} 684}
643 685
644/* 686/*
@@ -663,41 +705,233 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
663 * function pointers are really function descriptors, which contain a 705 * function pointers are really function descriptors, which contain a
664 * pointer to the real address. 706 * pointer to the real address.
665 */ 707 */
666static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags) 708static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
709 struct printf_spec spec)
667{ 710{
668 if (!ptr) 711 if (!ptr)
669 return string(buf, end, "(null)", field_width, precision, flags); 712 return string(buf, end, "(null)", spec);
670 713
671 switch (*fmt) { 714 switch (*fmt) {
672 case 'F': 715 case 'F':
673 ptr = dereference_function_descriptor(ptr); 716 ptr = dereference_function_descriptor(ptr);
674 /* Fallthrough */ 717 /* Fallthrough */
675 case 'S': 718 case 'S':
676 return symbol_string(buf, end, ptr, field_width, precision, flags); 719 return symbol_string(buf, end, ptr, spec);
677 case 'R': 720 case 'R':
678 return resource_string(buf, end, ptr, field_width, precision, flags); 721 return resource_string(buf, end, ptr, spec);
679 case 'm': 722 case 'm':
680 flags |= SPECIAL; 723 spec.flags |= SPECIAL;
681 /* Fallthrough */ 724 /* Fallthrough */
682 case 'M': 725 case 'M':
683 return mac_address_string(buf, end, ptr, field_width, precision, flags); 726 return mac_address_string(buf, end, ptr, spec);
684 case 'i': 727 case 'i':
685 flags |= SPECIAL; 728 spec.flags |= SPECIAL;
686 /* Fallthrough */ 729 /* Fallthrough */
687 case 'I': 730 case 'I':
688 if (fmt[1] == '6') 731 if (fmt[1] == '6')
689 return ip6_addr_string(buf, end, ptr, field_width, precision, flags); 732 return ip6_addr_string(buf, end, ptr, spec);
690 if (fmt[1] == '4') 733 if (fmt[1] == '4')
691 return ip4_addr_string(buf, end, ptr, field_width, precision, flags); 734 return ip4_addr_string(buf, end, ptr, spec);
692 flags &= ~SPECIAL; 735 spec.flags &= ~SPECIAL;
736 break;
737 }
738 spec.flags |= SMALL;
739 if (spec.field_width == -1) {
740 spec.field_width = 2*sizeof(void *);
741 spec.flags |= ZEROPAD;
742 }
743 spec.base = 16;
744
745 return number(buf, end, (unsigned long) ptr, spec);
746}
747
748/*
749 * Helper function to decode printf style format.
750 * Each call decode a token from the format and return the
751 * number of characters read (or likely the delta where it wants
752 * to go on the next call).
753 * The decoded token is returned through the parameters
754 *
755 * 'h', 'l', or 'L' for integer fields
756 * 'z' support added 23/7/1999 S.H.
757 * 'z' changed to 'Z' --davidm 1/25/99
758 * 't' added for ptrdiff_t
759 *
760 * @fmt: the format string
761 * @type of the token returned
762 * @flags: various flags such as +, -, # tokens..
763 * @field_width: overwritten width
764 * @base: base of the number (octal, hex, ...)
765 * @precision: precision of a number
766 * @qualifier: qualifier of a number (long, size_t, ...)
767 */
768static int format_decode(const char *fmt, struct printf_spec *spec)
769{
770 const char *start = fmt;
771
772 /* we finished early by reading the field width */
773 if (spec->type == FORMAT_TYPE_WIDTH) {
774 if (spec->field_width < 0) {
775 spec->field_width = -spec->field_width;
776 spec->flags |= LEFT;
777 }
778 spec->type = FORMAT_TYPE_NONE;
779 goto precision;
780 }
781
782 /* we finished early by reading the precision */
783 if (spec->type == FORMAT_TYPE_PRECISION) {
784 if (spec->precision < 0)
785 spec->precision = 0;
786
787 spec->type = FORMAT_TYPE_NONE;
788 goto qualifier;
789 }
790
791 /* By default */
792 spec->type = FORMAT_TYPE_NONE;
793
794 for (; *fmt ; ++fmt) {
795 if (*fmt == '%')
796 break;
797 }
798
799 /* Return the current non-format string */
800 if (fmt != start || !*fmt)
801 return fmt - start;
802
803 /* Process flags */
804 spec->flags = 0;
805
806 while (1) { /* this also skips first '%' */
807 bool found = true;
808
809 ++fmt;
810
811 switch (*fmt) {
812 case '-': spec->flags |= LEFT; break;
813 case '+': spec->flags |= PLUS; break;
814 case ' ': spec->flags |= SPACE; break;
815 case '#': spec->flags |= SPECIAL; break;
816 case '0': spec->flags |= ZEROPAD; break;
817 default: found = false;
818 }
819
820 if (!found)
821 break;
822 }
823
824 /* get field width */
825 spec->field_width = -1;
826
827 if (isdigit(*fmt))
828 spec->field_width = skip_atoi(&fmt);
829 else if (*fmt == '*') {
830 /* it's the next argument */
831 spec->type = FORMAT_TYPE_WIDTH;
832 return ++fmt - start;
833 }
834
835precision:
836 /* get the precision */
837 spec->precision = -1;
838 if (*fmt == '.') {
839 ++fmt;
840 if (isdigit(*fmt)) {
841 spec->precision = skip_atoi(&fmt);
842 if (spec->precision < 0)
843 spec->precision = 0;
844 } else if (*fmt == '*') {
845 /* it's the next argument */
846 spec->type = FORMAT_TYPE_PRECISION;
847 return ++fmt - start;
848 }
849 }
850
851qualifier:
852 /* get the conversion qualifier */
853 spec->qualifier = -1;
854 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
855 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
856 spec->qualifier = *fmt;
857 ++fmt;
858 if (spec->qualifier == 'l' && *fmt == 'l') {
859 spec->qualifier = 'L';
860 ++fmt;
861 }
862 }
863
864 /* default base */
865 spec->base = 10;
866 switch (*fmt) {
867 case 'c':
868 spec->type = FORMAT_TYPE_CHAR;
869 return ++fmt - start;
870
871 case 's':
872 spec->type = FORMAT_TYPE_STR;
873 return ++fmt - start;
874
875 case 'p':
876 spec->type = FORMAT_TYPE_PTR;
877 return fmt - start;
878 /* skip alnum */
879
880 case 'n':
881 spec->type = FORMAT_TYPE_NRCHARS;
882 return ++fmt - start;
883
884 case '%':
885 spec->type = FORMAT_TYPE_PERCENT_CHAR;
886 return ++fmt - start;
887
888 /* integer number formats - set up the flags and "break" */
889 case 'o':
890 spec->base = 8;
693 break; 891 break;
892
893 case 'x':
894 spec->flags |= SMALL;
895
896 case 'X':
897 spec->base = 16;
898 break;
899
900 case 'd':
901 case 'i':
902 spec->flags |= SIGN;
903 case 'u':
904 break;
905
906 default:
907 spec->type = FORMAT_TYPE_INVALID;
908 return fmt - start;
694 } 909 }
695 flags |= SMALL; 910
696 if (field_width == -1) { 911 if (spec->qualifier == 'L')
697 field_width = 2*sizeof(void *); 912 spec->type = FORMAT_TYPE_LONG_LONG;
698 flags |= ZEROPAD; 913 else if (spec->qualifier == 'l') {
914 if (spec->flags & SIGN)
915 spec->type = FORMAT_TYPE_LONG;
916 else
917 spec->type = FORMAT_TYPE_ULONG;
918 } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') {
919 spec->type = FORMAT_TYPE_SIZE_T;
920 } else if (spec->qualifier == 't') {
921 spec->type = FORMAT_TYPE_PTRDIFF;
922 } else if (spec->qualifier == 'h') {
923 if (spec->flags & SIGN)
924 spec->type = FORMAT_TYPE_SHORT;
925 else
926 spec->type = FORMAT_TYPE_USHORT;
927 } else {
928 if (spec->flags & SIGN)
929 spec->type = FORMAT_TYPE_INT;
930 else
931 spec->type = FORMAT_TYPE_UINT;
699 } 932 }
700 return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags); 933
934 return ++fmt - start;
701} 935}
702 936
703/** 937/**
@@ -726,18 +960,9 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field
726int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 960int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
727{ 961{
728 unsigned long long num; 962 unsigned long long num;
729 int base;
730 char *str, *end, c; 963 char *str, *end, c;
731 964 int read;
732 int flags; /* flags to number() */ 965 struct printf_spec spec = {0};
733
734 int field_width; /* width of output field */
735 int precision; /* min. # of digits for integers; max
736 number of chars for from string */
737 int qualifier; /* 'h', 'l', or 'L' for integer fields */
738 /* 'z' support added 23/7/1999 S.H. */
739 /* 'z' changed to 'Z' --davidm 1/25/99 */
740 /* 't' added for ptrdiff_t */
741 966
742 /* Reject out-of-range values early. Large positive sizes are 967 /* Reject out-of-range values early. Large positive sizes are
743 used for unknown buffer sizes. */ 968 used for unknown buffer sizes. */
@@ -758,184 +983,144 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
758 size = end - buf; 983 size = end - buf;
759 } 984 }
760 985
761 for (; *fmt ; ++fmt) { 986 while (*fmt) {
762 if (*fmt != '%') { 987 const char *old_fmt = fmt;
763 if (str < end)
764 *str = *fmt;
765 ++str;
766 continue;
767 }
768 988
769 /* process flags */ 989 read = format_decode(fmt, &spec);
770 flags = 0;
771 repeat:
772 ++fmt; /* this also skips first '%' */
773 switch (*fmt) {
774 case '-': flags |= LEFT; goto repeat;
775 case '+': flags |= PLUS; goto repeat;
776 case ' ': flags |= SPACE; goto repeat;
777 case '#': flags |= SPECIAL; goto repeat;
778 case '0': flags |= ZEROPAD; goto repeat;
779 }
780 990
781 /* get field width */ 991 fmt += read;
782 field_width = -1;
783 if (isdigit(*fmt))
784 field_width = skip_atoi(&fmt);
785 else if (*fmt == '*') {
786 ++fmt;
787 /* it's the next argument */
788 field_width = va_arg(args, int);
789 if (field_width < 0) {
790 field_width = -field_width;
791 flags |= LEFT;
792 }
793 }
794 992
795 /* get the precision */ 993 switch (spec.type) {
796 precision = -1; 994 case FORMAT_TYPE_NONE: {
797 if (*fmt == '.') { 995 int copy = read;
798 ++fmt; 996 if (str < end) {
799 if (isdigit(*fmt)) 997 if (copy > end - str)
800 precision = skip_atoi(&fmt); 998 copy = end - str;
801 else if (*fmt == '*') { 999 memcpy(str, old_fmt, copy);
802 ++fmt;
803 /* it's the next argument */
804 precision = va_arg(args, int);
805 } 1000 }
806 if (precision < 0) 1001 str += read;
807 precision = 0; 1002 break;
808 } 1003 }
809 1004
810 /* get the conversion qualifier */ 1005 case FORMAT_TYPE_WIDTH:
811 qualifier = -1; 1006 spec.field_width = va_arg(args, int);
812 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || 1007 break;
813 *fmt =='Z' || *fmt == 'z' || *fmt == 't') {
814 qualifier = *fmt;
815 ++fmt;
816 if (qualifier == 'l' && *fmt == 'l') {
817 qualifier = 'L';
818 ++fmt;
819 }
820 }
821 1008
822 /* default base */ 1009 case FORMAT_TYPE_PRECISION:
823 base = 10; 1010 spec.precision = va_arg(args, int);
1011 break;
824 1012
825 switch (*fmt) { 1013 case FORMAT_TYPE_CHAR:
826 case 'c': 1014 if (!(spec.flags & LEFT)) {
827 if (!(flags & LEFT)) { 1015 while (--spec.field_width > 0) {
828 while (--field_width > 0) {
829 if (str < end)
830 *str = ' ';
831 ++str;
832 }
833 }
834 c = (unsigned char) va_arg(args, int);
835 if (str < end)
836 *str = c;
837 ++str;
838 while (--field_width > 0) {
839 if (str < end) 1016 if (str < end)
840 *str = ' '; 1017 *str = ' ';
841 ++str; 1018 ++str;
842 }
843 continue;
844
845 case 's':
846 str = string(str, end, va_arg(args, char *), field_width, precision, flags);
847 continue;
848
849 case 'p':
850 str = pointer(fmt+1, str, end,
851 va_arg(args, void *),
852 field_width, precision, flags);
853 /* Skip all alphanumeric pointer suffixes */
854 while (isalnum(fmt[1]))
855 fmt++;
856 continue;
857
858 case 'n':
859 /* FIXME:
860 * What does C99 say about the overflow case here? */
861 if (qualifier == 'l') {
862 long * ip = va_arg(args, long *);
863 *ip = (str - buf);
864 } else if (qualifier == 'Z' || qualifier == 'z') {
865 size_t * ip = va_arg(args, size_t *);
866 *ip = (str - buf);
867 } else {
868 int * ip = va_arg(args, int *);
869 *ip = (str - buf);
870 }
871 continue;
872 1019
873 case '%': 1020 }
1021 }
1022 c = (unsigned char) va_arg(args, int);
1023 if (str < end)
1024 *str = c;
1025 ++str;
1026 while (--spec.field_width > 0) {
874 if (str < end) 1027 if (str < end)
875 *str = '%'; 1028 *str = ' ';
876 ++str; 1029 ++str;
877 continue; 1030 }
1031 break;
878 1032
879 /* integer number formats - set up the flags and "break" */ 1033 case FORMAT_TYPE_STR:
880 case 'o': 1034 str = string(str, end, va_arg(args, char *), spec);
881 base = 8; 1035 break;
882 break;
883 1036
884 case 'x': 1037 case FORMAT_TYPE_PTR:
885 flags |= SMALL; 1038 str = pointer(fmt+1, str, end, va_arg(args, void *),
886 case 'X': 1039 spec);
887 base = 16; 1040 while (isalnum(*fmt))
888 break; 1041 fmt++;
1042 break;
889 1043
890 case 'd': 1044 case FORMAT_TYPE_PERCENT_CHAR:
891 case 'i': 1045 if (str < end)
892 flags |= SIGN; 1046 *str = '%';
893 case 'u': 1047 ++str;
894 break; 1048 break;
895 1049
896 default: 1050 case FORMAT_TYPE_INVALID:
1051 if (str < end)
1052 *str = '%';
1053 ++str;
1054 if (*fmt) {
897 if (str < end) 1055 if (str < end)
898 *str = '%'; 1056 *str = *fmt;
899 ++str; 1057 ++str;
900 if (*fmt) { 1058 } else {
901 if (str < end) 1059 --fmt;
902 *str = *fmt; 1060 }
903 ++str; 1061 break;
904 } else { 1062
905 --fmt; 1063 case FORMAT_TYPE_NRCHARS: {
906 } 1064 int qualifier = spec.qualifier;
907 continue; 1065
1066 if (qualifier == 'l') {
1067 long *ip = va_arg(args, long *);
1068 *ip = (str - buf);
1069 } else if (qualifier == 'Z' ||
1070 qualifier == 'z') {
1071 size_t *ip = va_arg(args, size_t *);
1072 *ip = (str - buf);
1073 } else {
1074 int *ip = va_arg(args, int *);
1075 *ip = (str - buf);
1076 }
1077 break;
908 } 1078 }
909 if (qualifier == 'L') 1079
910 num = va_arg(args, long long); 1080 default:
911 else if (qualifier == 'l') { 1081 switch (spec.type) {
912 num = va_arg(args, unsigned long); 1082 case FORMAT_TYPE_LONG_LONG:
913 if (flags & SIGN) 1083 num = va_arg(args, long long);
914 num = (signed long) num; 1084 break;
915 } else if (qualifier == 'Z' || qualifier == 'z') { 1085 case FORMAT_TYPE_ULONG:
916 num = va_arg(args, size_t); 1086 num = va_arg(args, unsigned long);
917 } else if (qualifier == 't') { 1087 break;
918 num = va_arg(args, ptrdiff_t); 1088 case FORMAT_TYPE_LONG:
919 } else if (qualifier == 'h') { 1089 num = va_arg(args, long);
920 num = (unsigned short) va_arg(args, int); 1090 break;
921 if (flags & SIGN) 1091 case FORMAT_TYPE_SIZE_T:
922 num = (signed short) num; 1092 num = va_arg(args, size_t);
923 } else { 1093 break;
924 num = va_arg(args, unsigned int); 1094 case FORMAT_TYPE_PTRDIFF:
925 if (flags & SIGN) 1095 num = va_arg(args, ptrdiff_t);
926 num = (signed int) num; 1096 break;
1097 case FORMAT_TYPE_USHORT:
1098 num = (unsigned short) va_arg(args, int);
1099 break;
1100 case FORMAT_TYPE_SHORT:
1101 num = (short) va_arg(args, int);
1102 break;
1103 case FORMAT_TYPE_INT:
1104 num = (int) va_arg(args, int);
1105 break;
1106 default:
1107 num = va_arg(args, unsigned int);
1108 }
1109
1110 str = number(str, end, num, spec);
927 } 1111 }
928 str = number(str, end, num, base,
929 field_width, precision, flags);
930 } 1112 }
1113
931 if (size > 0) { 1114 if (size > 0) {
932 if (str < end) 1115 if (str < end)
933 *str = '\0'; 1116 *str = '\0';
934 else 1117 else
935 end[-1] = '\0'; 1118 end[-1] = '\0';
936 } 1119 }
1120
937 /* the trailing null byte doesn't count towards the total */ 1121 /* the trailing null byte doesn't count towards the total */
938 return str-buf; 1122 return str-buf;
1123
939} 1124}
940EXPORT_SYMBOL(vsnprintf); 1125EXPORT_SYMBOL(vsnprintf);
941 1126
@@ -1058,6 +1243,372 @@ int sprintf(char * buf, const char *fmt, ...)
1058} 1243}
1059EXPORT_SYMBOL(sprintf); 1244EXPORT_SYMBOL(sprintf);
1060 1245
1246#ifdef CONFIG_BINARY_PRINTF
1247/*
1248 * bprintf service:
1249 * vbin_printf() - VA arguments to binary data
1250 * bstr_printf() - Binary data to text string
1251 */
1252
1253/**
1254 * vbin_printf - Parse a format string and place args' binary value in a buffer
1255 * @bin_buf: The buffer to place args' binary value
1256 * @size: The size of the buffer(by words(32bits), not characters)
1257 * @fmt: The format string to use
1258 * @args: Arguments for the format string
1259 *
1260 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1261 * is skiped.
1262 *
1263 * The return value is the number of words(32bits) which would be generated for
1264 * the given input.
1265 *
1266 * NOTE:
1267 * If the return value is greater than @size, the resulting bin_buf is NOT
1268 * valid for bstr_printf().
1269 */
1270int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1271{
1272 struct printf_spec spec = {0};
1273 char *str, *end;
1274 int read;
1275
1276 str = (char *)bin_buf;
1277 end = (char *)(bin_buf + size);
1278
1279#define save_arg(type) \
1280do { \
1281 if (sizeof(type) == 8) { \
1282 unsigned long long value; \
1283 str = PTR_ALIGN(str, sizeof(u32)); \
1284 value = va_arg(args, unsigned long long); \
1285 if (str + sizeof(type) <= end) { \
1286 *(u32 *)str = *(u32 *)&value; \
1287 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1288 } \
1289 } else { \
1290 unsigned long value; \
1291 str = PTR_ALIGN(str, sizeof(type)); \
1292 value = va_arg(args, int); \
1293 if (str + sizeof(type) <= end) \
1294 *(typeof(type) *)str = (type)value; \
1295 } \
1296 str += sizeof(type); \
1297} while (0)
1298
1299
1300 while (*fmt) {
1301 read = format_decode(fmt, &spec);
1302
1303 fmt += read;
1304
1305 switch (spec.type) {
1306 case FORMAT_TYPE_NONE:
1307 break;
1308
1309 case FORMAT_TYPE_WIDTH:
1310 case FORMAT_TYPE_PRECISION:
1311 save_arg(int);
1312 break;
1313
1314 case FORMAT_TYPE_CHAR:
1315 save_arg(char);
1316 break;
1317
1318 case FORMAT_TYPE_STR: {
1319 const char *save_str = va_arg(args, char *);
1320 size_t len;
1321 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1322 || (unsigned long)save_str < PAGE_SIZE)
1323 save_str = "<NULL>";
1324 len = strlen(save_str);
1325 if (str + len + 1 < end)
1326 memcpy(str, save_str, len + 1);
1327 str += len + 1;
1328 break;
1329 }
1330
1331 case FORMAT_TYPE_PTR:
1332 save_arg(void *);
1333 /* skip all alphanumeric pointer suffixes */
1334 while (isalnum(*fmt))
1335 fmt++;
1336 break;
1337
1338 case FORMAT_TYPE_PERCENT_CHAR:
1339 break;
1340
1341 case FORMAT_TYPE_INVALID:
1342 if (!*fmt)
1343 --fmt;
1344 break;
1345
1346 case FORMAT_TYPE_NRCHARS: {
1347 /* skip %n 's argument */
1348 int qualifier = spec.qualifier;
1349 void *skip_arg;
1350 if (qualifier == 'l')
1351 skip_arg = va_arg(args, long *);
1352 else if (qualifier == 'Z' || qualifier == 'z')
1353 skip_arg = va_arg(args, size_t *);
1354 else
1355 skip_arg = va_arg(args, int *);
1356 break;
1357 }
1358
1359 default:
1360 switch (spec.type) {
1361
1362 case FORMAT_TYPE_LONG_LONG:
1363 save_arg(long long);
1364 break;
1365 case FORMAT_TYPE_ULONG:
1366 case FORMAT_TYPE_LONG:
1367 save_arg(unsigned long);
1368 break;
1369 case FORMAT_TYPE_SIZE_T:
1370 save_arg(size_t);
1371 break;
1372 case FORMAT_TYPE_PTRDIFF:
1373 save_arg(ptrdiff_t);
1374 break;
1375 case FORMAT_TYPE_USHORT:
1376 case FORMAT_TYPE_SHORT:
1377 save_arg(short);
1378 break;
1379 default:
1380 save_arg(int);
1381 }
1382 }
1383 }
1384 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1385
1386#undef save_arg
1387}
1388EXPORT_SYMBOL_GPL(vbin_printf);
1389
1390/**
1391 * bstr_printf - Format a string from binary arguments and place it in a buffer
1392 * @buf: The buffer to place the result into
1393 * @size: The size of the buffer, including the trailing null space
1394 * @fmt: The format string to use
1395 * @bin_buf: Binary arguments for the format string
1396 *
1397 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1398 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1399 * a binary buffer that generated by vbin_printf.
1400 *
1401 * The format follows C99 vsnprintf, but has some extensions:
1402 * %pS output the name of a text symbol
1403 * %pF output the name of a function pointer
1404 * %pR output the address range in a struct resource
1405 * %n is ignored
1406 *
1407 * The return value is the number of characters which would
1408 * be generated for the given input, excluding the trailing
1409 * '\0', as per ISO C99. If you want to have the exact
1410 * number of characters written into @buf as return value
1411 * (not including the trailing '\0'), use vscnprintf(). If the
1412 * return is greater than or equal to @size, the resulting
1413 * string is truncated.
1414 */
1415int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1416{
1417 unsigned long long num;
1418 char *str, *end, c;
1419 const char *args = (const char *)bin_buf;
1420
1421 struct printf_spec spec = {0};
1422
1423 if (unlikely((int) size < 0)) {
1424 /* There can be only one.. */
1425 static char warn = 1;
1426 WARN_ON(warn);
1427 warn = 0;
1428 return 0;
1429 }
1430
1431 str = buf;
1432 end = buf + size;
1433
1434#define get_arg(type) \
1435({ \
1436 typeof(type) value; \
1437 if (sizeof(type) == 8) { \
1438 args = PTR_ALIGN(args, sizeof(u32)); \
1439 *(u32 *)&value = *(u32 *)args; \
1440 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1441 } else { \
1442 args = PTR_ALIGN(args, sizeof(type)); \
1443 value = *(typeof(type) *)args; \
1444 } \
1445 args += sizeof(type); \
1446 value; \
1447})
1448
1449 /* Make sure end is always >= buf */
1450 if (end < buf) {
1451 end = ((void *)-1);
1452 size = end - buf;
1453 }
1454
1455 while (*fmt) {
1456 int read;
1457 const char *old_fmt = fmt;
1458
1459 read = format_decode(fmt, &spec);
1460
1461 fmt += read;
1462
1463 switch (spec.type) {
1464 case FORMAT_TYPE_NONE: {
1465 int copy = read;
1466 if (str < end) {
1467 if (copy > end - str)
1468 copy = end - str;
1469 memcpy(str, old_fmt, copy);
1470 }
1471 str += read;
1472 break;
1473 }
1474
1475 case FORMAT_TYPE_WIDTH:
1476 spec.field_width = get_arg(int);
1477 break;
1478
1479 case FORMAT_TYPE_PRECISION:
1480 spec.precision = get_arg(int);
1481 break;
1482
1483 case FORMAT_TYPE_CHAR:
1484 if (!(spec.flags & LEFT)) {
1485 while (--spec.field_width > 0) {
1486 if (str < end)
1487 *str = ' ';
1488 ++str;
1489 }
1490 }
1491 c = (unsigned char) get_arg(char);
1492 if (str < end)
1493 *str = c;
1494 ++str;
1495 while (--spec.field_width > 0) {
1496 if (str < end)
1497 *str = ' ';
1498 ++str;
1499 }
1500 break;
1501
1502 case FORMAT_TYPE_STR: {
1503 const char *str_arg = args;
1504 size_t len = strlen(str_arg);
1505 args += len + 1;
1506 str = string(str, end, (char *)str_arg, spec);
1507 break;
1508 }
1509
1510 case FORMAT_TYPE_PTR:
1511 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1512 while (isalnum(*fmt))
1513 fmt++;
1514 break;
1515
1516 case FORMAT_TYPE_PERCENT_CHAR:
1517 if (str < end)
1518 *str = '%';
1519 ++str;
1520 break;
1521
1522 case FORMAT_TYPE_INVALID:
1523 if (str < end)
1524 *str = '%';
1525 ++str;
1526 if (*fmt) {
1527 if (str < end)
1528 *str = *fmt;
1529 ++str;
1530 } else {
1531 --fmt;
1532 }
1533 break;
1534
1535 case FORMAT_TYPE_NRCHARS:
1536 /* skip */
1537 break;
1538
1539 default:
1540 switch (spec.type) {
1541
1542 case FORMAT_TYPE_LONG_LONG:
1543 num = get_arg(long long);
1544 break;
1545 case FORMAT_TYPE_ULONG:
1546 num = get_arg(unsigned long);
1547 break;
1548 case FORMAT_TYPE_LONG:
1549 num = get_arg(unsigned long);
1550 break;
1551 case FORMAT_TYPE_SIZE_T:
1552 num = get_arg(size_t);
1553 break;
1554 case FORMAT_TYPE_PTRDIFF:
1555 num = get_arg(ptrdiff_t);
1556 break;
1557 case FORMAT_TYPE_USHORT:
1558 num = get_arg(unsigned short);
1559 break;
1560 case FORMAT_TYPE_SHORT:
1561 num = get_arg(short);
1562 break;
1563 case FORMAT_TYPE_UINT:
1564 num = get_arg(unsigned int);
1565 break;
1566 default:
1567 num = get_arg(int);
1568 }
1569
1570 str = number(str, end, num, spec);
1571 }
1572 }
1573
1574 if (size > 0) {
1575 if (str < end)
1576 *str = '\0';
1577 else
1578 end[-1] = '\0';
1579 }
1580
1581#undef get_arg
1582
1583 /* the trailing null byte doesn't count towards the total */
1584 return str - buf;
1585}
1586EXPORT_SYMBOL_GPL(bstr_printf);
1587
1588/**
1589 * bprintf - Parse a format string and place args' binary value in a buffer
1590 * @bin_buf: The buffer to place args' binary value
1591 * @size: The size of the buffer(by words(32bits), not characters)
1592 * @fmt: The format string to use
1593 * @...: Arguments for the format string
1594 *
1595 * The function returns the number of words(u32) written
1596 * into @bin_buf.
1597 */
1598int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1599{
1600 va_list args;
1601 int ret;
1602
1603 va_start(args, fmt);
1604 ret = vbin_printf(bin_buf, size, fmt, args);
1605 va_end(args);
1606 return ret;
1607}
1608EXPORT_SYMBOL_GPL(bprintf);
1609
1610#endif /* CONFIG_BINARY_PRINTF */
1611
1061/** 1612/**
1062 * vsscanf - Unformat a buffer into a list of arguments 1613 * vsscanf - Unformat a buffer into a list of arguments
1063 * @buf: input buffer 1614 * @buf: input buffer
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-31 08:22:49 -0400