]>
git.ipfire.org Git - thirdparty/u-boot.git/blob - lib/vsprintf.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * (C) Copyright 2000-2009
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
9 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
11 * Wirzenius wrote this portably, Torvalds fucked it up :-)
13 * from hush: simple_itoa() was lifted from boa-0.93.15
18 #include <efi_loader.h>
24 #include <linux/ctype.h>
25 #include <linux/err.h>
26 #include <linux/types.h>
27 #include <linux/string.h>
29 /* we use this so that we can do without the ctype library */
30 #define is_digit(c) ((c) >= '0' && (c) <= '9')
32 static int skip_atoi(const char **s
)
37 i
= i
* 10 + *((*s
)++) - '0';
42 /* Decimal conversion is by far the most typical, and is used
43 * for /proc and /sys data. This directly impacts e.g. top performance
44 * with many processes running. We optimize it for speed
46 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
47 * (with permission from the author, Douglas W. Jones). */
49 /* Formats correctly any integer in [0,99999].
50 * Outputs from one to five digits depending on input.
51 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
52 static char *put_dec_trunc(char *buf
, unsigned q
)
54 unsigned d3
, d2
, d1
, d0
;
59 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
60 q
= (d0
* 0xcd) >> 11;
62 *buf
++ = d0
+ '0'; /* least significant digit */
63 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
65 q
= (d1
* 0xcd) >> 11;
67 *buf
++ = d1
+ '0'; /* next digit */
70 if ((d2
!= 0) || (d3
!= 0)) {
73 *buf
++ = d2
+ '0'; /* next digit */
77 q
= (d3
* 0xcd) >> 11;
79 *buf
++ = d3
+ '0'; /* next digit */
81 *buf
++ = q
+ '0'; /* most sign. digit */
87 /* Same with if's removed. Always emits five digits */
88 static char *put_dec_full(char *buf
, unsigned q
)
90 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
91 /* but anyway, gcc produces better code with full-sized ints */
92 unsigned d3
, d2
, d1
, d0
;
98 * Possible ways to approx. divide by 10
99 * gcc -O2 replaces multiply with shifts and adds
100 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
101 * (x * 0x67) >> 10: 1100111
102 * (x * 0x34) >> 9: 110100 - same
103 * (x * 0x1a) >> 8: 11010 - same
104 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
107 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
108 q
= (d0
* 0xcd) >> 11;
111 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
112 q
= (d1
* 0xcd) >> 11;
122 q
= (d3
* 0xcd) >> 11; /* - shorter code */
123 /* q = (d3 * 0x67) >> 10; - would also work */
129 /* No inlining helps gcc to use registers better */
130 static noinline
char *put_dec(char *buf
, uint64_t num
)
135 return put_dec_trunc(buf
, num
);
136 rem
= do_div(num
, 100000);
137 buf
= put_dec_full(buf
, rem
);
141 #define ZEROPAD 1 /* pad with zero */
142 #define SIGN 2 /* unsigned/signed long */
143 #define PLUS 4 /* show plus */
144 #define SPACE 8 /* space if plus */
145 #define LEFT 16 /* left justified */
146 #define SMALL 32 /* Must be 32 == 0x20 */
147 #define SPECIAL 64 /* 0x */
150 * Macro to add a new character to our output string, but only if it will
151 * fit. The macro moves to the next character position in the output string.
153 #define ADDCH(str, ch) do { \
159 static char *number(char *buf
, char *end
, u64 num
,
160 int base
, int size
, int precision
, int type
)
162 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
163 static const char digits
[16] = "0123456789ABCDEF";
168 int need_pfx
= ((type
& SPECIAL
) && base
!= 10);
171 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
172 * produces same digits or (maybe lowercased) letters */
173 locase
= (type
& SMALL
);
182 } else if (type
& PLUS
) {
185 } else if (type
& SPACE
) {
196 /* generate full string in tmp[], in reverse order */
200 /* Generic code, for any base:
202 tmp[i++] = (digits[do_div(num,base)] | locase);
205 else if (base
!= 10) { /* 8 or 16 */
213 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
]
217 } else { /* base 10 */
218 i
= put_dec(tmp
, num
) - tmp
;
221 /* printing 100 using %2d gives "100", not "00" */
224 /* leading space padding */
226 if (!(type
& (ZEROPAD
+ LEFT
))) {
233 /* "0x" / "0" prefix */
237 ADDCH(buf
, 'X' | locase
);
239 /* zero or space padding */
240 if (!(type
& LEFT
)) {
241 char c
= (type
& ZEROPAD
) ? '0' : ' ';
246 /* hmm even more zero padding? */
247 while (i
<= --precision
)
249 /* actual digits of result */
252 /* trailing space padding */
258 static char *string(char *buf
, char *end
, char *s
, int field_width
,
259 int precision
, int flags
)
266 len
= strnlen(s
, precision
);
269 while (len
< field_width
--)
271 for (i
= 0; i
< len
; ++i
)
273 while (len
< field_width
--)
278 /* U-Boot uses UTF-16 strings in the EFI context only. */
279 static __maybe_unused
char *string16(char *buf
, char *end
, u16
*s
,
280 int field_width
, int precision
, int flags
)
282 const u16
*str
= s
? s
: L
"<NULL>";
283 ssize_t i
, len
= utf16_strnlen(str
, precision
);
286 for (; len
< field_width
; --field_width
)
288 for (i
= 0; i
< len
&& buf
+ utf16_utf8_strnlen(str
, 1) <= end
; ++i
) {
289 s32 s
= utf16_get(&str
);
295 for (; len
< field_width
; --field_width
)
300 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
301 static char *device_path_string(char *buf
, char *end
, void *dp
, int field_width
,
302 int precision
, int flags
)
306 /* If dp == NULL output the string '<NULL>' */
308 return string16(buf
, end
, dp
, field_width
, precision
, flags
);
310 str
= efi_dp_str((struct efi_device_path
*)dp
);
312 return ERR_PTR(-ENOMEM
);
314 buf
= string16(buf
, end
, str
, field_width
, precision
, flags
);
320 static char *mac_address_string(char *buf
, char *end
, u8
*addr
, int field_width
,
321 int precision
, int flags
)
323 /* (6 * 2 hex digits), 5 colons and trailing zero */
324 char mac_addr
[6 * 3];
328 for (i
= 0; i
< 6; i
++) {
329 p
= hex_byte_pack(p
, addr
[i
]);
330 if (!(flags
& SPECIAL
) && i
!= 5)
335 return string(buf
, end
, mac_addr
, field_width
, precision
,
339 static char *ip6_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
340 int precision
, int flags
)
342 /* (8 * 4 hex digits), 7 colons and trailing zero */
343 char ip6_addr
[8 * 5];
347 for (i
= 0; i
< 8; i
++) {
348 p
= hex_byte_pack(p
, addr
[2 * i
]);
349 p
= hex_byte_pack(p
, addr
[2 * i
+ 1]);
350 if (!(flags
& SPECIAL
) && i
!= 7)
355 return string(buf
, end
, ip6_addr
, field_width
, precision
,
359 static char *ip4_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
360 int precision
, int flags
)
362 /* (4 * 3 decimal digits), 3 dots and trailing zero */
363 char ip4_addr
[4 * 4];
364 char temp
[3]; /* hold each IP quad in reverse order */
368 for (i
= 0; i
< 4; i
++) {
369 digits
= put_dec_trunc(temp
, addr
[i
]) - temp
;
370 /* reverse the digits in the quad */
378 return string(buf
, end
, ip4_addr
, field_width
, precision
,
382 #ifdef CONFIG_LIB_UUID
384 * This works (roughly) the same way as Linux's.
386 * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
387 * %pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
388 * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
389 * %pUL: 04030201-0605-0807-090A-0B0C0D0E0F10
391 static char *uuid_string(char *buf
, char *end
, u8
*addr
, int field_width
,
392 int precision
, int flags
, const char *fmt
)
394 char uuid
[UUID_STR_LEN
+ 1];
399 str_format
= UUID_STR_FORMAT_GUID
| UUID_STR_UPPER_CASE
;
402 str_format
= UUID_STR_FORMAT_GUID
;
405 str_format
= UUID_STR_FORMAT_STD
| UUID_STR_UPPER_CASE
;
408 str_format
= UUID_STR_FORMAT_STD
;
413 uuid_bin_to_str(addr
, uuid
, str_format
);
415 strcpy(uuid
, "<NULL>");
417 return string(buf
, end
, uuid
, field_width
, precision
, flags
);
422 * Show a '%p' thing. A kernel extension is that the '%p' is followed
423 * by an extra set of alphanumeric characters that are extended format
426 * Right now we handle:
428 * - 'M' For a 6-byte MAC address, it prints the address in the
429 * usual colon-separated hex notation
430 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
431 * decimal for v4 and colon separated network-order 16 bit hex for v6)
432 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
435 * Note: IPv6 support is currently if(0)'ed out. If you ever need
436 * %pI6, please add an IPV6 Kconfig knob, make your code select or
437 * depend on that, and change the 0 below to CONFIG_IS_ENABLED(IPV6).
439 static char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
440 int field_width
, int precision
, int flags
)
442 u64 num
= (uintptr_t)ptr
;
445 * Being a boot loader, we explicitly allow pointers to
446 * (physical) address null.
450 return string(buf
, end
, "(null)", field_width
, precision
,
455 /* Device paths only exist in the EFI context. */
456 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
458 return device_path_string(buf
, end
, ptr
, field_width
,
462 flags
|= SPECIAL
| ZEROPAD
;
467 field_width
= sizeof(phys_addr_t
) * 2 + 2;
468 num
= *(phys_addr_t
*)ptr
;
476 return mac_address_string(buf
, end
, ptr
, field_width
,
482 /* %pI6 currently unused */
483 if (0 && fmt
[1] == '6')
484 return ip6_addr_string(buf
, end
, ptr
, field_width
,
487 return ip4_addr_string(buf
, end
, ptr
, field_width
,
491 #ifdef CONFIG_LIB_UUID
493 return uuid_string(buf
, end
, ptr
, field_width
, precision
,
500 if (field_width
== -1) {
501 field_width
= 2*sizeof(void *);
504 return number(buf
, end
, num
, 16, field_width
, precision
, flags
);
507 static int vsnprintf_internal(char *buf
, size_t size
, const char *fmt
,
514 int flags
; /* flags to number() */
516 int field_width
; /* width of output field */
517 int precision
; /* min. # of digits for integers; max
518 number of chars for from string */
519 int qualifier
; /* 'h', 'l', or 'L' for integer fields */
520 /* 'z' support added 23/7/1999 S.H. */
521 /* 'z' changed to 'Z' --davidm 1/25/99 */
522 /* 't' added for ptrdiff_t */
523 char *end
= buf
+ size
;
525 /* Make sure end is always >= buf - do we want this in U-Boot? */
532 for (; *fmt
; ++fmt
) {
541 ++fmt
; /* this also skips first '%' */
560 /* get field width */
563 field_width
= skip_atoi(&fmt
);
564 else if (*fmt
== '*') {
566 /* it's the next argument */
567 field_width
= va_arg(args
, int);
568 if (field_width
< 0) {
569 field_width
= -field_width
;
574 /* get the precision */
579 precision
= skip_atoi(&fmt
);
580 else if (*fmt
== '*') {
582 /* it's the next argument */
583 precision
= va_arg(args
, int);
589 /* get the conversion qualifier */
591 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' ||
592 *fmt
== 'Z' || *fmt
== 'z' || *fmt
== 't') {
595 if (qualifier
== 'l' && *fmt
== 'l') {
606 if (!(flags
& LEFT
)) {
607 while (--field_width
> 0)
610 ADDCH(str
, (unsigned char) va_arg(args
, int));
611 while (--field_width
> 0)
616 /* U-Boot uses UTF-16 strings in the EFI context only. */
617 #if (CONFIG_IS_ENABLED(EFI_LOADER) || CONFIG_IS_ENABLED(EFI_APP)) && \
619 if (qualifier
== 'l') {
620 str
= string16(str
, end
, va_arg(args
, u16
*),
621 field_width
, precision
, flags
);
625 str
= string(str
, end
, va_arg(args
, char *),
626 field_width
, precision
, flags
);
631 str
= pointer(fmt
+ 1, str
, end
,
632 va_arg(args
, void *),
633 field_width
, precision
, flags
);
636 /* Skip all alphanumeric pointer suffixes */
637 while (isalnum(fmt
[1]))
642 if (qualifier
== 'l') {
643 long *ip
= va_arg(args
, long *);
646 int *ip
= va_arg(args
, int *);
655 /* integer number formats - set up the flags and "break" */
680 if (qualifier
== 'L') /* "quad" for 64 bit variables */
681 num
= va_arg(args
, unsigned long long);
682 else if (qualifier
== 'l') {
683 num
= va_arg(args
, unsigned long);
685 num
= (signed long) num
;
686 } else if (qualifier
== 'Z' || qualifier
== 'z') {
687 num
= va_arg(args
, size_t);
688 } else if (qualifier
== 't') {
689 num
= va_arg(args
, ptrdiff_t);
690 } else if (qualifier
== 'h') {
691 num
= (unsigned short) va_arg(args
, int);
693 num
= (signed short) num
;
695 num
= va_arg(args
, unsigned int);
697 num
= (signed int) num
;
699 str
= number(str
, end
, num
, base
, field_width
, precision
,
709 /* the trailing null byte doesn't count towards the total */
713 int vsnprintf(char *buf
, size_t size
, const char *fmt
,
716 return vsnprintf_internal(buf
, size
, fmt
, args
);
719 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
723 i
= vsnprintf(buf
, size
, fmt
, args
);
725 if (likely(i
< size
))
732 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
738 i
= vsnprintf(buf
, size
, fmt
, args
);
744 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
750 i
= vscnprintf(buf
, size
, fmt
, args
);
757 * Format a string and place it in a buffer (va_list version)
759 * @param buf The buffer to place the result into
760 * @param fmt The format string to use
761 * @param args Arguments for the format string
763 * The function returns the number of characters written
764 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
767 * If you're not already dealing with a va_list consider using sprintf().
769 int vsprintf(char *buf
, const char *fmt
, va_list args
)
771 return vsnprintf_internal(buf
, INT_MAX
, fmt
, args
);
774 int sprintf(char *buf
, const char *fmt
, ...)
780 i
= vsprintf(buf
, fmt
, args
);
785 #if CONFIG_IS_ENABLED(PRINTF)
786 int printf(const char *fmt
, ...)
792 i
= vprintf(fmt
, args
);
798 int vprintf(const char *fmt
, va_list args
)
801 char printbuffer
[CONFIG_SYS_PBSIZE
];
804 * For this to work, printbuffer must be larger than
805 * anything we ever want to print.
807 i
= vscnprintf(printbuffer
, sizeof(printbuffer
), fmt
, args
);
812 /* Print the string */
818 static char local_toa
[22];
820 char *simple_itoa(ulong i
)
822 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
823 char *p
= &local_toa
[21];
833 char *simple_xtoa(ulong num
)
835 /* 16 digits plus nul terminator, good for 64-bit or smaller ints */
836 char *p
= &local_toa
[17];
841 hex_byte_pack(p
, num
& 0xff);
848 /* We don't seem to have %'d in U-Boot */
849 void print_grouped_ull(unsigned long long int_val
, int digits
)
854 digits
= (digits
+ 2) / 3;
855 sprintf(str
, "%*llu", digits
* 3, int_val
);
856 for (s
= str
; *s
; s
+= grab
) {
858 putc(s
[-1] != ' ' ? ',' : ' ');
859 printf("%.*s", grab
, s
);
864 bool str2off(const char *p
, loff_t
*num
)
868 *num
= simple_strtoull(p
, &endptr
, 16);
869 return *p
!= '\0' && *endptr
== '\0';
872 bool str2long(const char *p
, ulong
*num
)
876 *num
= hextoul(p
, &endptr
);
877 return *p
!= '\0' && *endptr
== '\0';
880 char *strmhz(char *buf
, unsigned long hz
)
885 n
= DIV_ROUND_CLOSEST(hz
, 1000) / 1000L;
886 l
= sprintf(buf
, "%ld", n
);
889 m
= DIV_ROUND_CLOSEST(hz
, 1000L);
891 sprintf(buf
+ l
, ".%03ld", m
);