]>
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
15 #include <linux/types.h>
16 #include <linux/string.h>
17 #include <linux/ctype.h>
24 #define noinline __attribute__((noinline))
26 /* we use this so that we can do without the ctype library */
27 #define is_digit(c) ((c) >= '0' && (c) <= '9')
29 static int skip_atoi(const char **s
)
34 i
= i
* 10 + *((*s
)++) - '0';
39 /* Decimal conversion is by far the most typical, and is used
40 * for /proc and /sys data. This directly impacts e.g. top performance
41 * with many processes running. We optimize it for speed
43 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
44 * (with permission from the author, Douglas W. Jones). */
46 /* Formats correctly any integer in [0,99999].
47 * Outputs from one to five digits depending on input.
48 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
49 static char *put_dec_trunc(char *buf
, unsigned q
)
51 unsigned d3
, d2
, d1
, d0
;
56 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
57 q
= (d0
* 0xcd) >> 11;
59 *buf
++ = d0
+ '0'; /* least significant digit */
60 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
62 q
= (d1
* 0xcd) >> 11;
64 *buf
++ = d1
+ '0'; /* next digit */
67 if ((d2
!= 0) || (d3
!= 0)) {
70 *buf
++ = d2
+ '0'; /* next digit */
74 q
= (d3
* 0xcd) >> 11;
76 *buf
++ = d3
+ '0'; /* next digit */
78 *buf
++ = q
+ '0'; /* most sign. digit */
84 /* Same with if's removed. Always emits five digits */
85 static char *put_dec_full(char *buf
, unsigned q
)
87 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
88 /* but anyway, gcc produces better code with full-sized ints */
89 unsigned d3
, d2
, d1
, d0
;
95 * Possible ways to approx. divide by 10
96 * gcc -O2 replaces multiply with shifts and adds
97 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
98 * (x * 0x67) >> 10: 1100111
99 * (x * 0x34) >> 9: 110100 - same
100 * (x * 0x1a) >> 8: 11010 - same
101 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
104 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
105 q
= (d0
* 0xcd) >> 11;
108 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
109 q
= (d1
* 0xcd) >> 11;
119 q
= (d3
* 0xcd) >> 11; /* - shorter code */
120 /* q = (d3 * 0x67) >> 10; - would also work */
126 /* No inlining helps gcc to use registers better */
127 static noinline
char *put_dec(char *buf
, uint64_t num
)
132 return put_dec_trunc(buf
, num
);
133 rem
= do_div(num
, 100000);
134 buf
= put_dec_full(buf
, rem
);
138 #define ZEROPAD 1 /* pad with zero */
139 #define SIGN 2 /* unsigned/signed long */
140 #define PLUS 4 /* show plus */
141 #define SPACE 8 /* space if plus */
142 #define LEFT 16 /* left justified */
143 #define SMALL 32 /* Must be 32 == 0x20 */
144 #define SPECIAL 64 /* 0x */
147 * Macro to add a new character to our output string, but only if it will
148 * fit. The macro moves to the next character position in the output string.
150 #define ADDCH(str, ch) do { \
156 static char *number(char *buf
, char *end
, u64 num
,
157 int base
, int size
, int precision
, int type
)
159 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
160 static const char digits
[16] = "0123456789ABCDEF";
165 int need_pfx
= ((type
& SPECIAL
) && base
!= 10);
168 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
169 * produces same digits or (maybe lowercased) letters */
170 locase
= (type
& SMALL
);
179 } else if (type
& PLUS
) {
182 } else if (type
& SPACE
) {
193 /* generate full string in tmp[], in reverse order */
197 /* Generic code, for any base:
199 tmp[i++] = (digits[do_div(num,base)] | locase);
202 else if (base
!= 10) { /* 8 or 16 */
210 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
]
214 } else { /* base 10 */
215 i
= put_dec(tmp
, num
) - tmp
;
218 /* printing 100 using %2d gives "100", not "00" */
221 /* leading space padding */
223 if (!(type
& (ZEROPAD
+ LEFT
))) {
230 /* "0x" / "0" prefix */
234 ADDCH(buf
, 'X' | locase
);
236 /* zero or space padding */
237 if (!(type
& LEFT
)) {
238 char c
= (type
& ZEROPAD
) ? '0' : ' ';
243 /* hmm even more zero padding? */
244 while (i
<= --precision
)
246 /* actual digits of result */
249 /* trailing space padding */
255 static char *string(char *buf
, char *end
, char *s
, int field_width
,
256 int precision
, int flags
)
263 len
= strnlen(s
, precision
);
266 while (len
< field_width
--)
268 for (i
= 0; i
< len
; ++i
)
270 while (len
< field_width
--)
275 static char *string16(char *buf
, char *end
, u16
*s
, int field_width
,
276 int precision
, int flags
)
278 u16
*str
= s
? s
: L
"<NULL>";
279 int utf16_len
= utf16_strnlen(str
, precision
);
280 u8 utf8
[utf16_len
* MAX_UTF8_PER_UTF16
];
283 utf8_len
= utf16_to_utf8(utf8
, str
, utf16_len
) - utf8
;
286 while (utf8_len
< field_width
--)
288 for (i
= 0; i
< utf8_len
; ++i
)
290 while (utf8_len
< field_width
--)
295 #ifdef CONFIG_CMD_NET
296 static const char hex_asc
[] = "0123456789abcdef";
297 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
298 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
300 static inline char *pack_hex_byte(char *buf
, u8 byte
)
302 *buf
++ = hex_asc_hi(byte
);
303 *buf
++ = hex_asc_lo(byte
);
307 static char *mac_address_string(char *buf
, char *end
, u8
*addr
, int field_width
,
308 int precision
, int flags
)
310 /* (6 * 2 hex digits), 5 colons and trailing zero */
311 char mac_addr
[6 * 3];
315 for (i
= 0; i
< 6; i
++) {
316 p
= pack_hex_byte(p
, addr
[i
]);
317 if (!(flags
& SPECIAL
) && i
!= 5)
322 return string(buf
, end
, mac_addr
, field_width
, precision
,
326 static char *ip6_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
327 int precision
, int flags
)
329 /* (8 * 4 hex digits), 7 colons and trailing zero */
330 char ip6_addr
[8 * 5];
334 for (i
= 0; i
< 8; i
++) {
335 p
= pack_hex_byte(p
, addr
[2 * i
]);
336 p
= pack_hex_byte(p
, addr
[2 * i
+ 1]);
337 if (!(flags
& SPECIAL
) && i
!= 7)
342 return string(buf
, end
, ip6_addr
, field_width
, precision
,
346 static char *ip4_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
347 int precision
, int flags
)
349 /* (4 * 3 decimal digits), 3 dots and trailing zero */
350 char ip4_addr
[4 * 4];
351 char temp
[3]; /* hold each IP quad in reverse order */
355 for (i
= 0; i
< 4; i
++) {
356 digits
= put_dec_trunc(temp
, addr
[i
]) - temp
;
357 /* reverse the digits in the quad */
365 return string(buf
, end
, ip4_addr
, field_width
, precision
,
370 #ifdef CONFIG_LIB_UUID
372 * This works (roughly) the same way as linux's, but we currently always
373 * print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
374 * mostly just because that is what uuid_bin_to_str() supports.
376 * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
377 * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
379 static char *uuid_string(char *buf
, char *end
, u8
*addr
, int field_width
,
380 int precision
, int flags
, const char *fmt
)
382 char uuid
[UUID_STR_LEN
+ 1];
383 int str_format
= UUID_STR_FORMAT_STD
;
388 str_format
= UUID_STR_FORMAT_GUID
;
392 /* this is the default */
398 uuid_bin_to_str(addr
, uuid
, str_format
);
400 return string(buf
, end
, uuid
, field_width
, precision
, flags
);
405 * Show a '%p' thing. A kernel extension is that the '%p' is followed
406 * by an extra set of alphanumeric characters that are extended format
409 * Right now we handle:
411 * - 'M' For a 6-byte MAC address, it prints the address in the
412 * usual colon-separated hex notation
413 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
414 * decimal for v4 and colon separated network-order 16 bit hex for v6)
415 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
418 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
419 * function pointers are really function descriptors, which contain a
420 * pointer to the real address.
422 static char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
423 int field_width
, int precision
, int flags
)
425 u64 num
= (uintptr_t)ptr
;
428 * Being a boot loader, we explicitly allow pointers to
429 * (physical) address null.
433 return string(buf
, end
, "(null)", field_width
, precision
,
438 #ifdef CONFIG_CMD_NET
440 flags
|= SPECIAL
| ZEROPAD
;
445 field_width
= sizeof(phys_addr_t
) * 2 + 2;
446 num
= *(phys_addr_t
*)ptr
;
454 return mac_address_string(buf
, end
, ptr
, field_width
,
461 return ip6_addr_string(buf
, end
, ptr
, field_width
,
464 return ip4_addr_string(buf
, end
, ptr
, field_width
,
469 #ifdef CONFIG_LIB_UUID
471 return uuid_string(buf
, end
, ptr
, field_width
, precision
,
478 if (field_width
== -1) {
479 field_width
= 2*sizeof(void *);
482 return number(buf
, end
, num
, 16, field_width
, precision
, flags
);
485 static int vsnprintf_internal(char *buf
, size_t size
, const char *fmt
,
492 int flags
; /* flags to number() */
494 int field_width
; /* width of output field */
495 int precision
; /* min. # of digits for integers; max
496 number of chars for from string */
497 int qualifier
; /* 'h', 'l', or 'L' for integer fields */
498 /* 'z' support added 23/7/1999 S.H. */
499 /* 'z' changed to 'Z' --davidm 1/25/99 */
500 /* 't' added for ptrdiff_t */
501 char *end
= buf
+ size
;
503 /* Make sure end is always >= buf - do we want this in U-Boot? */
510 for (; *fmt
; ++fmt
) {
519 ++fmt
; /* this also skips first '%' */
538 /* get field width */
541 field_width
= skip_atoi(&fmt
);
542 else if (*fmt
== '*') {
544 /* it's the next argument */
545 field_width
= va_arg(args
, int);
546 if (field_width
< 0) {
547 field_width
= -field_width
;
552 /* get the precision */
557 precision
= skip_atoi(&fmt
);
558 else if (*fmt
== '*') {
560 /* it's the next argument */
561 precision
= va_arg(args
, int);
567 /* get the conversion qualifier */
569 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' ||
570 *fmt
== 'Z' || *fmt
== 'z' || *fmt
== 't') {
573 if (qualifier
== 'l' && *fmt
== 'l') {
584 if (!(flags
& LEFT
)) {
585 while (--field_width
> 0)
588 ADDCH(str
, (unsigned char) va_arg(args
, int));
589 while (--field_width
> 0)
594 if (qualifier
== 'l' && !IS_ENABLED(CONFIG_SPL_BUILD
)) {
595 str
= string16(str
, end
, va_arg(args
, u16
*),
596 field_width
, precision
, flags
);
598 str
= string(str
, end
, va_arg(args
, char *),
599 field_width
, precision
, flags
);
604 str
= pointer(fmt
+ 1, str
, end
,
605 va_arg(args
, void *),
606 field_width
, precision
, flags
);
607 /* Skip all alphanumeric pointer suffixes */
608 while (isalnum(fmt
[1]))
613 if (qualifier
== 'l') {
614 long *ip
= va_arg(args
, long *);
617 int *ip
= va_arg(args
, int *);
626 /* integer number formats - set up the flags and "break" */
651 if (qualifier
== 'L') /* "quad" for 64 bit variables */
652 num
= va_arg(args
, unsigned long long);
653 else if (qualifier
== 'l') {
654 num
= va_arg(args
, unsigned long);
656 num
= (signed long) num
;
657 } else if (qualifier
== 'Z' || qualifier
== 'z') {
658 num
= va_arg(args
, size_t);
659 } else if (qualifier
== 't') {
660 num
= va_arg(args
, ptrdiff_t);
661 } else if (qualifier
== 'h') {
662 num
= (unsigned short) va_arg(args
, int);
664 num
= (signed short) num
;
666 num
= va_arg(args
, unsigned int);
668 num
= (signed int) num
;
670 str
= number(str
, end
, num
, base
, field_width
, precision
,
680 /* the trailing null byte doesn't count towards the total */
684 int vsnprintf(char *buf
, size_t size
, const char *fmt
,
687 return vsnprintf_internal(buf
, size
, fmt
, args
);
690 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
694 i
= vsnprintf(buf
, size
, fmt
, args
);
696 if (likely(i
< size
))
703 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
709 i
= vsnprintf(buf
, size
, fmt
, args
);
715 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
721 i
= vscnprintf(buf
, size
, fmt
, args
);
728 * Format a string and place it in a buffer (va_list version)
730 * @param buf The buffer to place the result into
731 * @param fmt The format string to use
732 * @param args Arguments for the format string
734 * The function returns the number of characters written
735 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
738 * If you're not already dealing with a va_list consider using sprintf().
740 int vsprintf(char *buf
, const char *fmt
, va_list args
)
742 return vsnprintf_internal(buf
, INT_MAX
, fmt
, args
);
745 int sprintf(char *buf
, const char *fmt
, ...)
751 i
= vsprintf(buf
, fmt
, args
);
756 int printf(const char *fmt
, ...)
760 char printbuffer
[CONFIG_SYS_PBSIZE
];
765 * For this to work, printbuffer must be larger than
766 * anything we ever want to print.
768 i
= vscnprintf(printbuffer
, sizeof(printbuffer
), fmt
, args
);
771 /* Print the string */
776 int vprintf(const char *fmt
, va_list args
)
779 char printbuffer
[CONFIG_SYS_PBSIZE
];
782 * For this to work, printbuffer must be larger than
783 * anything we ever want to print.
785 i
= vscnprintf(printbuffer
, sizeof(printbuffer
), fmt
, args
);
787 /* Print the string */
793 void __assert_fail(const char *assertion
, const char *file
, unsigned line
,
794 const char *function
)
796 /* This will not return */
797 panic("%s:%u: %s: Assertion `%s' failed.", file
, line
, function
,
801 char *simple_itoa(ulong i
)
803 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
804 static char local
[22];
805 char *p
= &local
[21];
815 /* We don't seem to have %'d in U-Boot */
816 void print_grouped_ull(unsigned long long int_val
, int digits
)
821 digits
= (digits
+ 2) / 3;
822 sprintf(str
, "%*llu", digits
* 3, int_val
);
823 for (s
= str
; *s
; s
+= grab
) {
825 putc(s
[-1] != ' ' ? ',' : ' ');
826 printf("%.*s", grab
, s
);
831 bool str2off(const char *p
, loff_t
*num
)
835 *num
= simple_strtoull(p
, &endptr
, 16);
836 return *p
!= '\0' && *endptr
== '\0';
839 bool str2long(const char *p
, ulong
*num
)
843 *num
= simple_strtoul(p
, &endptr
, 16);
844 return *p
!= '\0' && *endptr
== '\0';