]>
git.ipfire.org Git - people/ms/u-boot.git/blob - lib/vsprintf.c
8c58a9366291bff911576e758156e8ec31b89213
4 * Copyright (C) 1991, 1992 Linus Torvalds
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
13 #include <linux/types.h>
14 #include <linux/string.h>
15 #include <linux/ctype.h>
18 #if !defined (CONFIG_PANIC_HANG)
21 extern int do_reset (cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *argv
[]);
25 # define NUM_TYPE long long
26 #define noinline __attribute__((noinline))
28 const char hex_asc
[] = "0123456789abcdef";
29 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
30 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
32 static inline char *pack_hex_byte(char *buf
, u8 byte
)
34 *buf
++ = hex_asc_hi(byte
);
35 *buf
++ = hex_asc_lo(byte
);
39 unsigned long simple_strtoul(const char *cp
,char **endp
,unsigned int base
)
41 unsigned long result
= 0,value
;
45 if ((*cp
== 'x') && isxdigit(cp
[1])) {
56 while (isxdigit(*cp
) && (value
= isdigit(*cp
) ? *cp
-'0' : (islower(*cp
)
57 ? toupper(*cp
) : *cp
)-'A'+10) < base
) {
58 result
= result
*base
+ value
;
66 long simple_strtol(const char *cp
,char **endp
,unsigned int base
)
69 return -simple_strtoul(cp
+1,endp
,base
);
70 return simple_strtoul(cp
,endp
,base
);
73 int ustrtoul(const char *cp
, char **endp
, unsigned int base
)
75 unsigned long result
= simple_strtoul(cp
, endp
, base
);
86 if ((*endp
)[1] == 'i') {
87 if ((*endp
)[2] == 'B')
96 unsigned long long simple_strtoull (const char *cp
, char **endp
, unsigned int base
)
98 unsigned long long result
= 0, value
;
102 if ((*cp
== 'x') && isxdigit (cp
[1])) {
113 while (isxdigit (*cp
) && (value
= isdigit (*cp
)
115 : (islower (*cp
) ? toupper (*cp
) : *cp
) - 'A' + 10) < base
) {
116 result
= result
* base
+ value
;
124 /* we use this so that we can do without the ctype library */
125 #define is_digit(c) ((c) >= '0' && (c) <= '9')
127 static int skip_atoi(const char **s
)
131 while (is_digit(**s
))
132 i
= i
*10 + *((*s
)++) - '0';
136 /* Decimal conversion is by far the most typical, and is used
137 * for /proc and /sys data. This directly impacts e.g. top performance
138 * with many processes running. We optimize it for speed
140 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
141 * (with permission from the author, Douglas W. Jones). */
143 /* Formats correctly any integer in [0,99999].
144 * Outputs from one to five digits depending on input.
145 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
146 static char* put_dec_trunc(char *buf
, unsigned q
)
148 unsigned d3
, d2
, d1
, d0
;
153 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
154 q
= (d0
* 0xcd) >> 11;
156 *buf
++ = d0
+ '0'; /* least significant digit */
157 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
159 q
= (d1
* 0xcd) >> 11;
161 *buf
++ = d1
+ '0'; /* next digit */
164 if ((d2
!= 0) || (d3
!= 0)) {
167 *buf
++ = d2
+ '0'; /* next digit */
171 q
= (d3
* 0xcd) >> 11;
173 *buf
++ = d3
+ '0'; /* next digit */
175 *buf
++ = q
+ '0'; /* most sign. digit */
181 /* Same with if's removed. Always emits five digits */
182 static char* put_dec_full(char *buf
, unsigned q
)
184 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
185 /* but anyway, gcc produces better code with full-sized ints */
186 unsigned d3
, d2
, d1
, d0
;
192 * Possible ways to approx. divide by 10
193 * gcc -O2 replaces multiply with shifts and adds
194 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
195 * (x * 0x67) >> 10: 1100111
196 * (x * 0x34) >> 9: 110100 - same
197 * (x * 0x1a) >> 8: 11010 - same
198 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
201 d0
= 6*(d3
+ d2
+ d1
) + (q
& 0xf);
202 q
= (d0
* 0xcd) >> 11;
205 d1
= q
+ 9*d3
+ 5*d2
+ d1
;
206 q
= (d1
* 0xcd) >> 11;
216 q
= (d3
* 0xcd) >> 11; /* - shorter code */
217 /* q = (d3 * 0x67) >> 10; - would also work */
223 /* No inlining helps gcc to use registers better */
224 static noinline
char* put_dec(char *buf
, unsigned NUM_TYPE num
)
229 return put_dec_trunc(buf
, num
);
230 rem
= do_div(num
, 100000);
231 buf
= put_dec_full(buf
, rem
);
235 #define ZEROPAD 1 /* pad with zero */
236 #define SIGN 2 /* unsigned/signed long */
237 #define PLUS 4 /* show plus */
238 #define SPACE 8 /* space if plus */
239 #define LEFT 16 /* left justified */
240 #define SMALL 32 /* Must be 32 == 0x20 */
241 #define SPECIAL 64 /* 0x */
243 static char *number(char *buf
, unsigned NUM_TYPE num
, int base
, int size
, int precision
, int type
)
245 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
246 static const char digits
[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
251 int need_pfx
= ((type
& SPECIAL
) && base
!= 10);
254 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
255 * produces same digits or (maybe lowercased) letters */
256 locase
= (type
& SMALL
);
261 if ((signed NUM_TYPE
) num
< 0) {
263 num
= - (signed NUM_TYPE
) num
;
265 } else if (type
& PLUS
) {
268 } else if (type
& SPACE
) {
279 /* generate full string in tmp[], in reverse order */
283 /* Generic code, for any base:
285 tmp[i++] = (digits[do_div(num,base)] | locase);
288 else if (base
!= 10) { /* 8 or 16 */
291 if (base
== 16) shift
= 4;
293 tmp
[i
++] = (digits
[((unsigned char)num
) & mask
] | locase
);
296 } else { /* base 10 */
297 i
= put_dec(tmp
, num
) - tmp
;
300 /* printing 100 using %2d gives "100", not "00" */
303 /* leading space padding */
305 if (!(type
& (ZEROPAD
+LEFT
)))
311 /* "0x" / "0" prefix */
315 *buf
++ = ('X' | locase
);
317 /* zero or space padding */
318 if (!(type
& LEFT
)) {
319 char c
= (type
& ZEROPAD
) ? '0' : ' ';
323 /* hmm even more zero padding? */
324 while (i
<= --precision
)
326 /* actual digits of result */
329 /* trailing space padding */
335 static char *string(char *buf
, char *s
, int field_width
, int precision
, int flags
)
342 len
= strnlen(s
, precision
);
345 while (len
< field_width
--)
347 for (i
= 0; i
< len
; ++i
)
349 while (len
< field_width
--)
354 #ifdef CONFIG_CMD_NET
355 static char *mac_address_string(char *buf
, u8
*addr
, int field_width
,
356 int precision
, int flags
)
358 char mac_addr
[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
362 for (i
= 0; i
< 6; i
++) {
363 p
= pack_hex_byte(p
, addr
[i
]);
364 if (!(flags
& SPECIAL
) && i
!= 5)
369 return string(buf
, mac_addr
, field_width
, precision
, flags
& ~SPECIAL
);
372 static char *ip6_addr_string(char *buf
, u8
*addr
, int field_width
,
373 int precision
, int flags
)
375 char ip6_addr
[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
379 for (i
= 0; i
< 8; i
++) {
380 p
= pack_hex_byte(p
, addr
[2 * i
]);
381 p
= pack_hex_byte(p
, addr
[2 * i
+ 1]);
382 if (!(flags
& SPECIAL
) && i
!= 7)
387 return string(buf
, ip6_addr
, field_width
, precision
, flags
& ~SPECIAL
);
390 static char *ip4_addr_string(char *buf
, u8
*addr
, int field_width
,
391 int precision
, int flags
)
393 char ip4_addr
[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
394 char temp
[3]; /* hold each IP quad in reverse order */
398 for (i
= 0; i
< 4; i
++) {
399 digits
= put_dec_trunc(temp
, addr
[i
]) - temp
;
400 /* reverse the digits in the quad */
408 return string(buf
, ip4_addr
, field_width
, precision
, flags
& ~SPECIAL
);
413 * Show a '%p' thing. A kernel extension is that the '%p' is followed
414 * by an extra set of alphanumeric characters that are extended format
417 * Right now we handle:
419 * - 'M' For a 6-byte MAC address, it prints the address in the
420 * usual colon-separated hex notation
421 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
422 * decimal for v4 and colon separated network-order 16 bit hex for v6)
423 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
426 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
427 * function pointers are really function descriptors, which contain a
428 * pointer to the real address.
430 static char *pointer(const char *fmt
, char *buf
, void *ptr
, int field_width
, int precision
, int flags
)
433 return string(buf
, "(null)", field_width
, precision
, flags
);
435 #ifdef CONFIG_CMD_NET
441 return mac_address_string(buf
, ptr
, field_width
, precision
, flags
);
447 return ip6_addr_string(buf
, ptr
, field_width
, precision
, flags
);
449 return ip4_addr_string(buf
, ptr
, field_width
, precision
, flags
);
455 if (field_width
== -1) {
456 field_width
= 2*sizeof(void *);
459 return number(buf
, (unsigned long) ptr
, 16, field_width
, precision
, flags
);
463 * vsprintf - Format a string and place it in a buffer
464 * @buf: The buffer to place the result into
465 * @fmt: The format string to use
466 * @args: Arguments for the format string
468 * This function follows C99 vsprintf, but has some extensions:
469 * %pS output the name of a text symbol
470 * %pF output the name of a function pointer
471 * %pR output the address range in a struct resource
473 * The function returns the number of characters written
476 * Call this function if you are already dealing with a va_list.
477 * You probably want sprintf() instead.
479 int vsprintf(char *buf
, const char *fmt
, va_list args
)
481 unsigned NUM_TYPE num
;
485 int flags
; /* flags to number() */
487 int field_width
; /* width of output field */
488 int precision
; /* min. # of digits for integers; max
489 number of chars for from string */
490 int qualifier
; /* 'h', 'l', or 'L' for integer fields */
491 /* 'z' support added 23/7/1999 S.H. */
492 /* 'z' changed to 'Z' --davidm 1/25/99 */
493 /* 't' added for ptrdiff_t */
497 for (; *fmt
; ++fmt
) {
506 ++fmt
; /* this also skips first '%' */
508 case '-': flags
|= LEFT
; goto repeat
;
509 case '+': flags
|= PLUS
; goto repeat
;
510 case ' ': flags
|= SPACE
; goto repeat
;
511 case '#': flags
|= SPECIAL
; goto repeat
;
512 case '0': flags
|= ZEROPAD
; goto repeat
;
515 /* get field width */
518 field_width
= skip_atoi(&fmt
);
519 else if (*fmt
== '*') {
521 /* it's the next argument */
522 field_width
= va_arg(args
, int);
523 if (field_width
< 0) {
524 field_width
= -field_width
;
529 /* get the precision */
534 precision
= skip_atoi(&fmt
);
535 else if (*fmt
== '*') {
537 /* it's the next argument */
538 precision
= va_arg(args
, int);
544 /* get the conversion qualifier */
546 if (*fmt
== 'h' || *fmt
== 'l' || *fmt
== 'L' ||
547 *fmt
== 'Z' || *fmt
== 'z' || *fmt
== 't') {
550 if (qualifier
== 'l' && *fmt
== 'l') {
562 while (--field_width
> 0)
564 *str
++ = (unsigned char) va_arg(args
, int);
565 while (--field_width
> 0)
570 str
= string(str
, va_arg(args
, char *), field_width
, precision
, flags
);
574 str
= pointer(fmt
+1, str
,
575 va_arg(args
, void *),
576 field_width
, precision
, flags
);
577 /* Skip all alphanumeric pointer suffixes */
578 while (isalnum(fmt
[1]))
583 if (qualifier
== 'l') {
584 long * ip
= va_arg(args
, long *);
587 int * ip
= va_arg(args
, int *);
596 /* integer number formats - set up the flags and "break" */
621 if (qualifier
== 'L') /* "quad" for 64 bit variables */
622 num
= va_arg(args
, unsigned long long);
623 else if (qualifier
== 'l') {
624 num
= va_arg(args
, unsigned long);
626 num
= (signed long) num
;
627 } else if (qualifier
== 'Z' || qualifier
== 'z') {
628 num
= va_arg(args
, size_t);
629 } else if (qualifier
== 't') {
630 num
= va_arg(args
, ptrdiff_t);
631 } else if (qualifier
== 'h') {
632 num
= (unsigned short) va_arg(args
, int);
634 num
= (signed short) num
;
636 num
= va_arg(args
, unsigned int);
638 num
= (signed int) num
;
640 str
= number(str
, num
, base
, field_width
, precision
, flags
);
647 * sprintf - Format a string and place it in a buffer
648 * @buf: The buffer to place the result into
649 * @fmt: The format string to use
650 * @...: Arguments for the format string
652 * The function returns the number of characters written
655 * See the vsprintf() documentation for format string extensions over C99.
657 int sprintf(char * buf
, const char *fmt
, ...)
663 i
=vsprintf(buf
,fmt
,args
);
668 void panic(const char *fmt
, ...)
675 #if defined (CONFIG_PANIC_HANG)
678 udelay (100000); /* allow messages to go out */
679 do_reset (NULL
, 0, 0, NULL
);