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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>
21 #if !defined(CONFIG_PANIC_HANG)
26 #define noinline __attribute__((noinline))
28 /* some reluctance to put this into a new limits.h, so it is here */
29 #define INT_MAX ((int)(~0U>>1))
31 static const char hex_asc
[] = "0123456789abcdef";
32 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
33 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
35 static inline char *pack_hex_byte(char *buf
, u8 byte
)
37 *buf
++ = hex_asc_hi(byte
);
38 *buf
++ = hex_asc_lo(byte
);
42 unsigned long simple_strtoul(const char *cp
, char **endp
,
45 unsigned long result
= 0;
50 if ((*cp
== 'x') && isxdigit(cp
[1])) {
62 while (isxdigit(*cp
) && (value
= isdigit(*cp
) ? *cp
-'0' : (islower(*cp
)
63 ? toupper(*cp
) : *cp
)-'A'+10) < base
) {
64 result
= result
*base
+ value
;
74 int strict_strtoul(const char *cp
, unsigned int base
, unsigned long *res
)
85 val
= simple_strtoul(cp
, &tail
, base
);
89 if ((*tail
== '\0') ||
90 ((len
== (size_t)(tail
- cp
) + 1) && (*tail
== '\n'))) {
98 long simple_strtol(const char *cp
, char **endp
, unsigned int base
)
101 return -simple_strtoul(cp
+ 1, endp
, base
);
103 return simple_strtoul(cp
, endp
, base
);
106 unsigned long ustrtoul(const char *cp
, char **endp
, unsigned int base
)
108 unsigned long result
= simple_strtoul(cp
, endp
, base
);
119 if ((*endp
)[1] == 'i') {
120 if ((*endp
)[2] == 'B')
129 unsigned long long simple_strtoull(const char *cp
, char **endp
,
132 unsigned long long result
= 0, value
;
136 if ((*cp
== 'x') && isxdigit(cp
[1])) {
148 while (isxdigit(*cp
) && (value
= isdigit(*cp
) ? *cp
- '0'
149 : (islower(*cp
) ? toupper(*cp
) : *cp
) - 'A' + 10) < base
) {
150 result
= result
* base
+ value
;
160 /* we use this so that we can do without the ctype library */
161 #define is_digit(c) ((c) >= '0' && (c) <= '9')
163 static int skip_atoi(const char **s
)
167 while (is_digit(**s
))
168 i
= i
* 10 + *((*s
)++) - '0';
173 /* Decimal conversion is by far the most typical, and is used
174 * for /proc and /sys data. This directly impacts e.g. top performance
175 * with many processes running. We optimize it for speed
177 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
178 * (with permission from the author, Douglas W. Jones). */
180 /* Formats correctly any integer in [0,99999].
181 * Outputs from one to five digits depending on input.
182 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
183 static char *put_dec_trunc(char *buf
, unsigned q
)
185 unsigned d3
, d2
, d1
, d0
;
190 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
191 q
= (d0
* 0xcd) >> 11;
193 *buf
++ = d0
+ '0'; /* least significant digit */
194 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
196 q
= (d1
* 0xcd) >> 11;
198 *buf
++ = d1
+ '0'; /* next digit */
201 if ((d2
!= 0) || (d3
!= 0)) {
204 *buf
++ = d2
+ '0'; /* next digit */
208 q
= (d3
* 0xcd) >> 11;
210 *buf
++ = d3
+ '0'; /* next digit */
212 *buf
++ = q
+ '0'; /* most sign. digit */
218 /* Same with if's removed. Always emits five digits */
219 static char *put_dec_full(char *buf
, unsigned q
)
221 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
222 /* but anyway, gcc produces better code with full-sized ints */
223 unsigned d3
, d2
, d1
, d0
;
229 * Possible ways to approx. divide by 10
230 * gcc -O2 replaces multiply with shifts and adds
231 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
232 * (x * 0x67) >> 10: 1100111
233 * (x * 0x34) >> 9: 110100 - same
234 * (x * 0x1a) >> 8: 11010 - same
235 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
238 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
239 q
= (d0
* 0xcd) >> 11;
242 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
243 q
= (d1
* 0xcd) >> 11;
253 q
= (d3
* 0xcd) >> 11; /* - shorter code */
254 /* q = (d3 * 0x67) >> 10; - would also work */
260 /* No inlining helps gcc to use registers better */
261 static noinline
char *put_dec(char *buf
, u64 num
)
266 return put_dec_trunc(buf
, num
);
267 rem
= do_div(num
, 100000);
268 buf
= put_dec_full(buf
, rem
);
272 #define ZEROPAD 1 /* pad with zero */
273 #define SIGN 2 /* unsigned/signed long */
274 #define PLUS 4 /* show plus */
275 #define SPACE 8 /* space if plus */
276 #define LEFT 16 /* left justified */
277 #define SMALL 32 /* Must be 32 == 0x20 */
278 #define SPECIAL 64 /* 0x */
280 #ifdef CONFIG_SYS_VSNPRINTF
282 * Macro to add a new character to our output string, but only if it will
283 * fit. The macro moves to the next character position in the output string.
285 #define ADDCH(str, ch) do { \
291 #define ADDCH(str, ch) (*(str)++ = (ch))
294 static char *number(char *buf
, char *end
, u64 num
,
295 int base
, int size
, int precision
, int type
)
297 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
298 static const char digits
[16] = "0123456789ABCDEF";
303 int need_pfx
= ((type
& SPECIAL
) && base
!= 10);
306 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
307 * produces same digits or (maybe lowercased) letters */
308 locase
= (type
& SMALL
);
317 } else if (type
& PLUS
) {
320 } else if (type
& SPACE
) {
331 /* generate full string in tmp[], in reverse order */
335 /* Generic code, for any base:
337 tmp[i++] = (digits[do_div(num,base)] | locase);
340 else if (base
!= 10) { /* 8 or 16 */
348 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
]
352 } else { /* base 10 */
353 i
= put_dec(tmp
, num
) - tmp
;
356 /* printing 100 using %2d gives "100", not "00" */
359 /* leading space padding */
361 if (!(type
& (ZEROPAD
+ LEFT
))) {
368 /* "0x" / "0" prefix */
372 ADDCH(buf
, 'X' | locase
);
374 /* zero or space padding */
375 if (!(type
& LEFT
)) {
376 char c
= (type
& ZEROPAD
) ? '0' : ' ';
381 /* hmm even more zero padding? */
382 while (i
<= --precision
)
384 /* actual digits of result */
387 /* trailing space padding */
393 static char *string(char *buf
, char *end
, char *s
, int field_width
,
394 int precision
, int flags
)
401 len
= strnlen(s
, precision
);
404 while (len
< field_width
--)
406 for (i
= 0; i
< len
; ++i
)
408 while (len
< field_width
--)
413 #ifdef CONFIG_CMD_NET
414 static char *mac_address_string(char *buf
, char *end
, u8
*addr
, int field_width
,
415 int precision
, int flags
)
417 /* (6 * 2 hex digits), 5 colons and trailing zero */
418 char mac_addr
[6 * 3];
422 for (i
= 0; i
< 6; i
++) {
423 p
= pack_hex_byte(p
, addr
[i
]);
424 if (!(flags
& SPECIAL
) && i
!= 5)
429 return string(buf
, end
, mac_addr
, field_width
, precision
,
433 static char *ip6_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
434 int precision
, int flags
)
436 /* (8 * 4 hex digits), 7 colons and trailing zero */
437 char ip6_addr
[8 * 5];
441 for (i
= 0; i
< 8; i
++) {
442 p
= pack_hex_byte(p
, addr
[2 * i
]);
443 p
= pack_hex_byte(p
, addr
[2 * i
+ 1]);
444 if (!(flags
& SPECIAL
) && i
!= 7)
449 return string(buf
, end
, ip6_addr
, field_width
, precision
,
453 static char *ip4_addr_string(char *buf
, char *end
, u8
*addr
, int field_width
,
454 int precision
, int flags
)
456 /* (4 * 3 decimal digits), 3 dots and trailing zero */
457 char ip4_addr
[4 * 4];
458 char temp
[3]; /* hold each IP quad in reverse order */
462 for (i
= 0; i
< 4; i
++) {
463 digits
= put_dec_trunc(temp
, addr
[i
]) - temp
;
464 /* reverse the digits in the quad */
472 return string(buf
, end
, ip4_addr
, field_width
, precision
,
478 * Show a '%p' thing. A kernel extension is that the '%p' is followed
479 * by an extra set of alphanumeric characters that are extended format
482 * Right now we handle:
484 * - 'M' For a 6-byte MAC address, it prints the address in the
485 * usual colon-separated hex notation
486 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
487 * decimal for v4 and colon separated network-order 16 bit hex for v6)
488 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
491 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
492 * function pointers are really function descriptors, which contain a
493 * pointer to the real address.
495 static char *pointer(const char *fmt
, char *buf
, char *end
, void *ptr
,
496 int field_width
, int precision
, int flags
)
499 * Being a boot loader, we explicitly allow pointers to
500 * (physical) address null.
504 return string(buf
, end
, "(null)", field_width
, precision
,
508 #ifdef CONFIG_CMD_NET
514 return mac_address_string(buf
, end
, ptr
, field_width
,
521 return ip6_addr_string(buf
, end
, ptr
, field_width
,
524 return ip4_addr_string(buf
, end
, ptr
, field_width
,
531 if (field_width
== -1) {
532 field_width
= 2*sizeof(void *);
535 return number(buf
, end
, (unsigned long)ptr
, 16, field_width
,
539 static int vsnprintf_internal(char *buf
, size_t size
, const char *fmt
,
546 int flags
; /* flags to number() */
548 int field_width
; /* width of output field */
549 int precision
; /* min. # of digits for integers; max
550 number of chars for from string */
551 int qualifier
; /* 'h', 'l', or 'L' for integer fields */
552 /* 'z' support added 23/7/1999 S.H. */
553 /* 'z' changed to 'Z' --davidm 1/25/99 */
554 /* 't' added for ptrdiff_t */
555 char *end
= buf
+ size
;
557 #ifdef CONFIG_SYS_VSNPRINTF
558 /* Make sure end is always >= buf - do we want this in U-Boot? */
566 for (; *fmt
; ++fmt
) {
575 ++fmt
; /* this also skips first '%' */
594 /* get field width */
597 field_width
= skip_atoi(&fmt
);
598 else if (*fmt
== '*') {
600 /* it's the next argument */
601 field_width
= va_arg(args
, int);
602 if (field_width
< 0) {
603 field_width
= -field_width
;
608 /* get the precision */
613 precision
= skip_atoi(&fmt
);
614 else if (*fmt
== '*') {
616 /* it's the next argument */
617 precision
= va_arg(args
, int);
623 /* get the conversion qualifier */
625 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' ||
626 *fmt
== 'Z' || *fmt
== 'z' || *fmt
== 't') {
629 if (qualifier
== 'l' && *fmt
== 'l') {
640 if (!(flags
& LEFT
)) {
641 while (--field_width
> 0)
644 ADDCH(str
, (unsigned char) va_arg(args
, int));
645 while (--field_width
> 0)
650 str
= string(str
, end
, va_arg(args
, char *),
651 field_width
, precision
, flags
);
655 str
= pointer(fmt
+ 1, str
, end
,
656 va_arg(args
, void *),
657 field_width
, precision
, flags
);
658 /* Skip all alphanumeric pointer suffixes */
659 while (isalnum(fmt
[1]))
664 if (qualifier
== 'l') {
665 long *ip
= va_arg(args
, long *);
668 int *ip
= va_arg(args
, int *);
677 /* integer number formats - set up the flags and "break" */
702 if (qualifier
== 'L') /* "quad" for 64 bit variables */
703 num
= va_arg(args
, unsigned long long);
704 else if (qualifier
== 'l') {
705 num
= va_arg(args
, unsigned long);
707 num
= (signed long) num
;
708 } else if (qualifier
== 'Z' || qualifier
== 'z') {
709 num
= va_arg(args
, size_t);
710 } else if (qualifier
== 't') {
711 num
= va_arg(args
, ptrdiff_t);
712 } else if (qualifier
== 'h') {
713 num
= (unsigned short) va_arg(args
, int);
715 num
= (signed short) num
;
717 num
= va_arg(args
, unsigned int);
719 num
= (signed int) num
;
721 str
= number(str
, end
, num
, base
, field_width
, precision
,
725 #ifdef CONFIG_SYS_VSNPRINTF
734 /* the trailing null byte doesn't count towards the total */
738 #ifdef CONFIG_SYS_VSNPRINTF
739 int vsnprintf(char *buf
, size_t size
, const char *fmt
,
742 return vsnprintf_internal(buf
, size
, fmt
, args
);
745 int vscnprintf(char *buf
, size_t size
, const char *fmt
, va_list args
)
749 i
= vsnprintf(buf
, size
, fmt
, args
);
751 if (likely(i
< size
))
758 int snprintf(char *buf
, size_t size
, const char *fmt
, ...)
764 i
= vsnprintf(buf
, size
, fmt
, args
);
770 int scnprintf(char *buf
, size_t size
, const char *fmt
, ...)
776 i
= vscnprintf(buf
, size
, fmt
, args
);
781 #endif /* CONFIG_SYS_VSNPRINT */
784 * Format a string and place it in a buffer (va_list version)
786 * @param buf The buffer to place the result into
787 * @param fmt The format string to use
788 * @param args Arguments for the format string
790 * The function returns the number of characters written
791 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
794 * If you're not already dealing with a va_list consider using sprintf().
796 int vsprintf(char *buf
, const char *fmt
, va_list args
)
798 return vsnprintf_internal(buf
, INT_MAX
, fmt
, args
);
801 int sprintf(char *buf
, const char *fmt
, ...)
807 i
= vsprintf(buf
, fmt
, args
);
812 void panic(const char *fmt
, ...)
819 #if defined(CONFIG_PANIC_HANG)
822 udelay(100000); /* allow messages to go out */
823 do_reset(NULL
, 0, 0, NULL
);
829 void __assert_fail(const char *assertion
, const char *file
, unsigned line
,
830 const char *function
)
832 /* This will not return */
833 panic("%s:%u: %s: Assertion `%s' failed.", file
, line
, function
,
837 char *simple_itoa(ulong i
)
839 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
840 static char local
[22];
841 char *p
= &local
[21];