]>
git.ipfire.org Git - people/ms/u-boot.git/blob - lib/vsprintf.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
11 * from hush: simple_itoa() was lifted from boa-0.93.15
16 #include <efi_loader.h>
20 #include <linux/ctype.h>
21 #include <linux/err.h>
22 #include <linux/types.h>
23 #include <linux/string.h>
25 #define noinline __attribute__((noinline))
27 /* we use this so that we can do without the ctype library */
28 #define is_digit(c) ((c) >= '0' && (c) <= '9')
30 static int skip_atoi(const char **s
)
35 i
= i
* 10 + *((*s
)++) - '0';
40 /* Decimal conversion is by far the most typical, and is used
41 * for /proc and /sys data. This directly impacts e.g. top performance
42 * with many processes running. We optimize it for speed
44 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
45 * (with permission from the author, Douglas W. Jones). */
47 /* Formats correctly any integer in [0,99999].
48 * Outputs from one to five digits depending on input.
49 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
50 static char *put_dec_trunc(char *buf
, unsigned q
)
52 unsigned d3
, d2
, d1
, d0
;
57 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
58 q
= (d0
* 0xcd) >> 11;
60 *buf
++ = d0
+ '0'; /* least significant digit */
61 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
63 q
= (d1
* 0xcd) >> 11;
65 *buf
++ = d1
+ '0'; /* next digit */
68 if ((d2
!= 0) || (d3
!= 0)) {
71 *buf
++ = d2
+ '0'; /* next digit */
75 q
= (d3
* 0xcd) >> 11;
77 *buf
++ = d3
+ '0'; /* next digit */
79 *buf
++ = q
+ '0'; /* most sign. digit */
85 /* Same with if's removed. Always emits five digits */
86 static char *put_dec_full(char *buf
, unsigned q
)
88 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
89 /* but anyway, gcc produces better code with full-sized ints */
90 unsigned d3
, d2
, d1
, d0
;
96 * Possible ways to approx. divide by 10
97 * gcc -O2 replaces multiply with shifts and adds
98 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
99 * (x * 0x67) >> 10: 1100111
100 * (x * 0x34) >> 9: 110100 - same
101 * (x * 0x1a) >> 8: 11010 - same
102 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
105 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
106 q
= (d0
* 0xcd) >> 11;
109 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
110 q
= (d1
* 0xcd) >> 11;
120 q
= (d3
* 0xcd) >> 11; /* - shorter code */
121 /* q = (d3 * 0x67) >> 10; - would also work */
127 /* No inlining helps gcc to use registers better */
128 static noinline
char *put_dec(char *buf
, uint64_t num
)
133 return put_dec_trunc(buf
, num
);
134 rem
= do_div(num
, 100000);
135 buf
= put_dec_full(buf
, rem
);
139 #define ZEROPAD 1 /* pad with zero */
140 #define SIGN 2 /* unsigned/signed long */
141 #define PLUS 4 /* show plus */
142 #define SPACE 8 /* space if plus */
143 #define LEFT 16 /* left justified */
144 #define SMALL 32 /* Must be 32 == 0x20 */
145 #define SPECIAL 64 /* 0x */
148 * Macro to add a new character to our output string, but only if it will
149 * fit. The macro moves to the next character position in the output string.
151 #define ADDCH(str, ch) do { \
157 static char *number(char *buf
, char *end
, u64 num
,
158 int base
, int size
, int precision
, int type
)
160 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
161 static const char digits
[16] = "0123456789ABCDEF";
166 int need_pfx
= ((type
& SPECIAL
) && base
!= 10);
169 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
170 * produces same digits or (maybe lowercased) letters */
171 locase
= (type
& SMALL
);
180 } else if (type
& PLUS
) {
183 } else if (type
& SPACE
) {
194 /* generate full string in tmp[], in reverse order */
198 /* Generic code, for any base:
200 tmp[i++] = (digits[do_div(num,base)] | locase);
203 else if (base
!= 10) { /* 8 or 16 */
211 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
]
215 } else { /* base 10 */
216 i
= put_dec(tmp
, num
) - tmp
;
219 /* printing 100 using %2d gives "100", not "00" */
222 /* leading space padding */
224 if (!(type
& (ZEROPAD
+ LEFT
))) {
231 /* "0x" / "0" prefix */
235 ADDCH(buf
, 'X' | locase
);
237 /* zero or space padding */
238 if (!(type
& LEFT
)) {
239 char c
= (type
& ZEROPAD
) ? '0' : ' ';
244 /* hmm even more zero padding? */
245 while (i
<= --precision
)
247 /* actual digits of result */
250 /* trailing space padding */
256 static char *string(char *buf
, char *end
, char *s
, int field_width
,
257 int precision
, int flags
)
264 len
= strnlen(s
, precision
);
267 while (len
< field_width
--)
269 for (i
= 0; i
< len
; ++i
)
271 while (len
< field_width
--)
276 static char *string16(char *buf
, char *end
, u16
*s
, int field_width
,
277 int precision
, int flags
)
279 u16
*str
= s
? s
: L
"<NULL>";
280 int utf16_len
= utf16_strnlen(str
, precision
);
281 u8 utf8
[utf16_len
* MAX_UTF8_PER_UTF16
];
284 utf8_len
= utf16_to_utf8(utf8
, str
, utf16_len
) - utf8
;
287 while (utf8_len
< field_width
--)
289 for (i
= 0; i
< utf8_len
; ++i
)
291 while (utf8_len
< field_width
--)
296 #if defined(CONFIG_EFI_LOADER) && \
297 !defined(CONFIG_SPL_BUILD) && !defined(API_BUILD)
298 static char *device_path_string(char *buf
, char *end
, void *dp
, int field_width
,
299 int precision
, int flags
)
306 str
= efi_dp_str((struct efi_device_path
*)dp
);
308 return ERR_PTR(-ENOMEM
);
310 buf
= string16(buf
, end
, str
, field_width
, precision
, flags
);
316 #ifdef CONFIG_CMD_NET
317 static const char hex_asc
[] = "0123456789abcdef";
318 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
319 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
321 static inline char *pack_hex_byte(char *buf
, u8 byte
)
323 *buf
++ = hex_asc_hi(byte
);
324 *buf
++ = hex_asc_lo(byte
);
328 static char *mac_address_string(char *buf
, char *end
, u8
*addr
, int field_width
,
329 int precision
, int flags
)
331 /* (6 * 2 hex digits), 5 colons and trailing zero */
332 char mac_addr
[6 * 3];
336 for (i
= 0; i
< 6; i
++) {
337 p
= pack_hex_byte(p
, addr
[i
]);
338 if (!(flags
& SPECIAL
) && i
!= 5)
343 return string(buf
, end
, mac_addr
, field_width
, precision
,
347 static char *ip6_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
348 int precision
, int flags
)
350 /* (8 * 4 hex digits), 7 colons and trailing zero */
351 char ip6_addr
[8 * 5];
355 for (i
= 0; i
< 8; i
++) {
356 p
= pack_hex_byte(p
, addr
[2 * i
]);
357 p
= pack_hex_byte(p
, addr
[2 * i
+ 1]);
358 if (!(flags
& SPECIAL
) && i
!= 7)
363 return string(buf
, end
, ip6_addr
, field_width
, precision
,
367 static char *ip4_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
368 int precision
, int flags
)
370 /* (4 * 3 decimal digits), 3 dots and trailing zero */
371 char ip4_addr
[4 * 4];
372 char temp
[3]; /* hold each IP quad in reverse order */
376 for (i
= 0; i
< 4; i
++) {
377 digits
= put_dec_trunc(temp
, addr
[i
]) - temp
;
378 /* reverse the digits in the quad */
386 return string(buf
, end
, ip4_addr
, field_width
, precision
,
391 #ifdef CONFIG_LIB_UUID
393 * This works (roughly) the same way as linux's, but we currently always
394 * print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
395 * mostly just because that is what uuid_bin_to_str() supports.
397 * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
398 * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
400 static char *uuid_string(char *buf
, char *end
, u8
*addr
, int field_width
,
401 int precision
, int flags
, const char *fmt
)
403 char uuid
[UUID_STR_LEN
+ 1];
404 int str_format
= UUID_STR_FORMAT_STD
;
409 str_format
= UUID_STR_FORMAT_GUID
;
413 /* this is the default */
419 uuid_bin_to_str(addr
, uuid
, str_format
);
421 return string(buf
, end
, uuid
, field_width
, precision
, flags
);
426 * Show a '%p' thing. A kernel extension is that the '%p' is followed
427 * by an extra set of alphanumeric characters that are extended format
430 * Right now we handle:
432 * - 'M' For a 6-byte MAC address, it prints the address in the
433 * usual colon-separated hex notation
434 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
435 * decimal for v4 and colon separated network-order 16 bit hex for v6)
436 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
439 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
440 * function pointers are really function descriptors, which contain a
441 * pointer to the real address.
443 static char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
444 int field_width
, int precision
, int flags
)
446 u64 num
= (uintptr_t)ptr
;
449 * Being a boot loader, we explicitly allow pointers to
450 * (physical) address null.
454 return string(buf
, end
, "(null)", field_width
, precision
,
459 #if defined(CONFIG_EFI_LOADER) && \
460 !defined(CONFIG_SPL_BUILD) && !defined(API_BUILD)
462 return device_path_string(buf
, end
, ptr
, field_width
,
465 #ifdef CONFIG_CMD_NET
467 flags
|= SPECIAL
| ZEROPAD
;
472 field_width
= sizeof(phys_addr_t
) * 2 + 2;
473 num
= *(phys_addr_t
*)ptr
;
481 return mac_address_string(buf
, end
, ptr
, field_width
,
488 return ip6_addr_string(buf
, end
, ptr
, field_width
,
491 return ip4_addr_string(buf
, end
, ptr
, field_width
,
496 #ifdef CONFIG_LIB_UUID
498 return uuid_string(buf
, end
, ptr
, field_width
, precision
,
505 if (field_width
== -1) {
506 field_width
= 2*sizeof(void *);
509 return number(buf
, end
, num
, 16, field_width
, precision
, flags
);
512 static int vsnprintf_internal(char *buf
, size_t size
, const char *fmt
,
519 int flags
; /* flags to number() */
521 int field_width
; /* width of output field */
522 int precision
; /* min. # of digits for integers; max
523 number of chars for from string */
524 int qualifier
; /* 'h', 'l', or 'L' for integer fields */
525 /* 'z' support added 23/7/1999 S.H. */
526 /* 'z' changed to 'Z' --davidm 1/25/99 */
527 /* 't' added for ptrdiff_t */
528 char *end
= buf
+ size
;
530 /* Make sure end is always >= buf - do we want this in U-Boot? */
537 for (; *fmt
; ++fmt
) {
546 ++fmt
; /* this also skips first '%' */
565 /* get field width */
568 field_width
= skip_atoi(&fmt
);
569 else if (*fmt
== '*') {
571 /* it's the next argument */
572 field_width
= va_arg(args
, int);
573 if (field_width
< 0) {
574 field_width
= -field_width
;
579 /* get the precision */
584 precision
= skip_atoi(&fmt
);
585 else if (*fmt
== '*') {
587 /* it's the next argument */
588 precision
= va_arg(args
, int);
594 /* get the conversion qualifier */
596 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' ||
597 *fmt
== 'Z' || *fmt
== 'z' || *fmt
== 't') {
600 if (qualifier
== 'l' && *fmt
== 'l') {
611 if (!(flags
& LEFT
)) {
612 while (--field_width
> 0)
615 ADDCH(str
, (unsigned char) va_arg(args
, int));
616 while (--field_width
> 0)
621 if (qualifier
== 'l' && !IS_ENABLED(CONFIG_SPL_BUILD
)) {
622 str
= string16(str
, end
, va_arg(args
, u16
*),
623 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 int printf(const char *fmt
, ...)
789 char printbuffer
[CONFIG_SYS_PBSIZE
];
794 * For this to work, printbuffer must be larger than
795 * anything we ever want to print.
797 i
= vscnprintf(printbuffer
, sizeof(printbuffer
), fmt
, args
);
803 /* Print the string */
808 int vprintf(const char *fmt
, va_list args
)
811 char printbuffer
[CONFIG_SYS_PBSIZE
];
814 * For this to work, printbuffer must be larger than
815 * anything we ever want to print.
817 i
= vscnprintf(printbuffer
, sizeof(printbuffer
), fmt
, args
);
822 /* Print the string */
828 void __assert_fail(const char *assertion
, const char *file
, unsigned line
,
829 const char *function
)
831 /* This will not return */
832 panic("%s:%u: %s: Assertion `%s' failed.", file
, line
, function
,
836 char *simple_itoa(ulong i
)
838 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
839 static char local
[22];
840 char *p
= &local
[21];
850 /* We don't seem to have %'d in U-Boot */
851 void print_grouped_ull(unsigned long long int_val
, int digits
)
856 digits
= (digits
+ 2) / 3;
857 sprintf(str
, "%*llu", digits
* 3, int_val
);
858 for (s
= str
; *s
; s
+= grab
) {
860 putc(s
[-1] != ' ' ? ',' : ' ');
861 printf("%.*s", grab
, s
);
866 bool str2off(const char *p
, loff_t
*num
)
870 *num
= simple_strtoull(p
, &endptr
, 16);
871 return *p
!= '\0' && *endptr
== '\0';
874 bool str2long(const char *p
, ulong
*num
)
878 *num
= simple_strtoul(p
, &endptr
, 16);
879 return *p
!= '\0' && *endptr
== '\0';