1 /*
2 * linux/lib/vsprintf.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * (C) Copyright 2000-2009
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 */
8
9 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
10 /*
11 * Wirzenius wrote this portably, Torvalds fucked it up :-)
12 *
13 * from hush: simple_itoa() was lifted from boa-0.93.15
14 */
15
16 #include <common.h>
17 #include <charset.h>
18 #include <efi_loader.h>
19 #include <div64.h>
20 #include <hexdump.h>
21 #include <stdarg.h>
22 #include <vsprintf.h>
23 #include <linux/ctype.h>
24 #include <linux/err.h>
25 #include <linux/types.h>
26 #include <linux/string.h>
27
28 #define noinline __attribute__((noinline))
29
30 /* we use this so that we can do without the ctype library */
31 #define is_digit(c) ((c) >= '0' && (c) <= '9')
32
skip_atoi(const char ** s)33 static int skip_atoi(const char **s)
34 {
35 int i = 0;
36
37 while (is_digit(**s))
38 i = i * 10 + *((*s)++) - '0';
39
40 return i;
41 }
42
43 /* Decimal conversion is by far the most typical, and is used
44 * for /proc and /sys data. This directly impacts e.g. top performance
45 * with many processes running. We optimize it for speed
46 * using code from
47 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
48 * (with permission from the author, Douglas W. Jones). */
49
50 /* Formats correctly any integer in [0,99999].
51 * Outputs from one to five digits depending on input.
52 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
put_dec_trunc(char * buf,unsigned q)53 static char *put_dec_trunc(char *buf, unsigned q)
54 {
55 unsigned d3, d2, d1, d0;
56 d1 = (q>>4) & 0xf;
57 d2 = (q>>8) & 0xf;
58 d3 = (q>>12);
59
60 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
61 q = (d0 * 0xcd) >> 11;
62 d0 = d0 - 10*q;
63 *buf++ = d0 + '0'; /* least significant digit */
64 d1 = q + 9*d3 + 5*d2 + d1;
65 if (d1 != 0) {
66 q = (d1 * 0xcd) >> 11;
67 d1 = d1 - 10*q;
68 *buf++ = d1 + '0'; /* next digit */
69
70 d2 = q + 2*d2;
71 if ((d2 != 0) || (d3 != 0)) {
72 q = (d2 * 0xd) >> 7;
73 d2 = d2 - 10*q;
74 *buf++ = d2 + '0'; /* next digit */
75
76 d3 = q + 4*d3;
77 if (d3 != 0) {
78 q = (d3 * 0xcd) >> 11;
79 d3 = d3 - 10*q;
80 *buf++ = d3 + '0'; /* next digit */
81 if (q != 0)
82 *buf++ = q + '0'; /* most sign. digit */
83 }
84 }
85 }
86 return buf;
87 }
88 /* Same with if's removed. Always emits five digits */
put_dec_full(char * buf,unsigned q)89 static char *put_dec_full(char *buf, unsigned q)
90 {
91 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
92 /* but anyway, gcc produces better code with full-sized ints */
93 unsigned d3, d2, d1, d0;
94 d1 = (q>>4) & 0xf;
95 d2 = (q>>8) & 0xf;
96 d3 = (q>>12);
97
98 /*
99 * Possible ways to approx. divide by 10
100 * gcc -O2 replaces multiply with shifts and adds
101 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
102 * (x * 0x67) >> 10: 1100111
103 * (x * 0x34) >> 9: 110100 - same
104 * (x * 0x1a) >> 8: 11010 - same
105 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
106 */
107
108 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
109 q = (d0 * 0xcd) >> 11;
110 d0 = d0 - 10*q;
111 *buf++ = d0 + '0';
112 d1 = q + 9*d3 + 5*d2 + d1;
113 q = (d1 * 0xcd) >> 11;
114 d1 = d1 - 10*q;
115 *buf++ = d1 + '0';
116
117 d2 = q + 2*d2;
118 q = (d2 * 0xd) >> 7;
119 d2 = d2 - 10*q;
120 *buf++ = d2 + '0';
121
122 d3 = q + 4*d3;
123 q = (d3 * 0xcd) >> 11; /* - shorter code */
124 /* q = (d3 * 0x67) >> 10; - would also work */
125 d3 = d3 - 10*q;
126 *buf++ = d3 + '0';
127 *buf++ = q + '0';
128 return buf;
129 }
130 /* No inlining helps gcc to use registers better */
put_dec(char * buf,uint64_t num)131 static noinline char *put_dec(char *buf, uint64_t num)
132 {
133 while (1) {
134 unsigned rem;
135 if (num < 100000)
136 return put_dec_trunc(buf, num);
137 rem = do_div(num, 100000);
138 buf = put_dec_full(buf, rem);
139 }
140 }
141
142 #define ZEROPAD 1 /* pad with zero */
143 #define SIGN 2 /* unsigned/signed long */
144 #define PLUS 4 /* show plus */
145 #define SPACE 8 /* space if plus */
146 #define LEFT 16 /* left justified */
147 #define SMALL 32 /* Must be 32 == 0x20 */
148 #define SPECIAL 64 /* 0x */
149
150 /*
151 * Macro to add a new character to our output string, but only if it will
152 * fit. The macro moves to the next character position in the output string.
153 */
154 #define ADDCH(str, ch) do { \
155 if ((str) < end) \
156 *(str) = (ch); \
157 ++str; \
158 } while (0)
159
number(char * buf,char * end,u64 num,int base,int size,int precision,int type)160 static char *number(char *buf, char *end, u64 num,
161 int base, int size, int precision, int type)
162 {
163 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
164 static const char digits[16] = "0123456789ABCDEF";
165
166 char tmp[66];
167 char sign;
168 char locase;
169 int need_pfx = ((type & SPECIAL) && base != 10);
170 int i;
171
172 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
173 * produces same digits or (maybe lowercased) letters */
174 locase = (type & SMALL);
175 if (type & LEFT)
176 type &= ~ZEROPAD;
177 sign = 0;
178 if (type & SIGN) {
179 if ((s64) num < 0) {
180 sign = '-';
181 num = -(s64) num;
182 size--;
183 } else if (type & PLUS) {
184 sign = '+';
185 size--;
186 } else if (type & SPACE) {
187 sign = ' ';
188 size--;
189 }
190 }
191 if (need_pfx) {
192 size--;
193 if (base == 16)
194 size--;
195 }
196
197 /* generate full string in tmp[], in reverse order */
198 i = 0;
199 if (num == 0)
200 tmp[i++] = '0';
201 /* Generic code, for any base:
202 else do {
203 tmp[i++] = (digits[do_div(num,base)] | locase);
204 } while (num != 0);
205 */
206 else if (base != 10) { /* 8 or 16 */
207 int mask = base - 1;
208 int shift = 3;
209
210 if (base == 16)
211 shift = 4;
212
213 do {
214 tmp[i++] = (digits[((unsigned char)num) & mask]
215 | locase);
216 num >>= shift;
217 } while (num);
218 } else { /* base 10 */
219 i = put_dec(tmp, num) - tmp;
220 }
221
222 /* printing 100 using %2d gives "100", not "00" */
223 if (i > precision)
224 precision = i;
225 /* leading space padding */
226 size -= precision;
227 if (!(type & (ZEROPAD + LEFT))) {
228 while (--size >= 0)
229 ADDCH(buf, ' ');
230 }
231 /* sign */
232 if (sign)
233 ADDCH(buf, sign);
234 /* "0x" / "0" prefix */
235 if (need_pfx) {
236 ADDCH(buf, '0');
237 if (base == 16)
238 ADDCH(buf, 'X' | locase);
239 }
240 /* zero or space padding */
241 if (!(type & LEFT)) {
242 char c = (type & ZEROPAD) ? '0' : ' ';
243
244 while (--size >= 0)
245 ADDCH(buf, c);
246 }
247 /* hmm even more zero padding? */
248 while (i <= --precision)
249 ADDCH(buf, '0');
250 /* actual digits of result */
251 while (--i >= 0)
252 ADDCH(buf, tmp[i]);
253 /* trailing space padding */
254 while (--size >= 0)
255 ADDCH(buf, ' ');
256 return buf;
257 }
258
string(char * buf,char * end,char * s,int field_width,int precision,int flags)259 static char *string(char *buf, char *end, char *s, int field_width,
260 int precision, int flags)
261 {
262 int len, i;
263
264 if (s == NULL)
265 s = "<NULL>";
266
267 len = strnlen(s, precision);
268
269 if (!(flags & LEFT))
270 while (len < field_width--)
271 ADDCH(buf, ' ');
272 for (i = 0; i < len; ++i)
273 ADDCH(buf, *s++);
274 while (len < field_width--)
275 ADDCH(buf, ' ');
276 return buf;
277 }
278
279 /* U-Boot uses UTF-16 strings in the EFI context only. */
280 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
string16(char * buf,char * end,u16 * s,int field_width,int precision,int flags)281 static char *string16(char *buf, char *end, u16 *s, int field_width,
282 int precision, int flags)
283 {
284 const u16 *str = s ? s : L"<NULL>";
285 ssize_t i, len = utf16_strnlen(str, precision);
286
287 if (!(flags & LEFT))
288 for (; len < field_width; --field_width)
289 ADDCH(buf, ' ');
290 for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
291 s32 s = utf16_get(&str);
292
293 if (s < 0)
294 s = '?';
295 utf8_put(s, &buf);
296 }
297 for (; len < field_width; --field_width)
298 ADDCH(buf, ' ');
299 return buf;
300 }
301
302 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
device_path_string(char * buf,char * end,void * dp,int field_width,int precision,int flags)303 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
304 int precision, int flags)
305 {
306 u16 *str;
307
308 /* If dp == NULL output the string '<NULL>' */
309 if (!dp)
310 return string16(buf, end, dp, field_width, precision, flags);
311
312 str = efi_dp_str((struct efi_device_path *)dp);
313 if (!str)
314 return ERR_PTR(-ENOMEM);
315
316 buf = string16(buf, end, str, field_width, precision, flags);
317 efi_free_pool(str);
318 return buf;
319 }
320 #endif
321 #endif
322
mac_address_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)323 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
324 int precision, int flags)
325 {
326 /* (6 * 2 hex digits), 5 colons and trailing zero */
327 char mac_addr[6 * 3];
328 char *p = mac_addr;
329 int i;
330
331 for (i = 0; i < 6; i++) {
332 p = hex_byte_pack(p, addr[i]);
333 if (!(flags & SPECIAL) && i != 5)
334 *p++ = ':';
335 }
336 *p = '\0';
337
338 return string(buf, end, mac_addr, field_width, precision,
339 flags & ~SPECIAL);
340 }
341
ip6_addr_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)342 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
343 int precision, int flags)
344 {
345 /* (8 * 4 hex digits), 7 colons and trailing zero */
346 char ip6_addr[8 * 5];
347 char *p = ip6_addr;
348 int i;
349
350 for (i = 0; i < 8; i++) {
351 p = hex_byte_pack(p, addr[2 * i]);
352 p = hex_byte_pack(p, addr[2 * i + 1]);
353 if (!(flags & SPECIAL) && i != 7)
354 *p++ = ':';
355 }
356 *p = '\0';
357
358 return string(buf, end, ip6_addr, field_width, precision,
359 flags & ~SPECIAL);
360 }
361
ip4_addr_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)362 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
363 int precision, int flags)
364 {
365 /* (4 * 3 decimal digits), 3 dots and trailing zero */
366 char ip4_addr[4 * 4];
367 char temp[3]; /* hold each IP quad in reverse order */
368 char *p = ip4_addr;
369 int i, digits;
370
371 for (i = 0; i < 4; i++) {
372 digits = put_dec_trunc(temp, addr[i]) - temp;
373 /* reverse the digits in the quad */
374 while (digits--)
375 *p++ = temp[digits];
376 if (i != 3)
377 *p++ = '.';
378 }
379 *p = '\0';
380
381 return string(buf, end, ip4_addr, field_width, precision,
382 flags & ~SPECIAL);
383 }
384
385 #ifdef CONFIG_LIB_UUID
386 /*
387 * This works (roughly) the same way as Linux's.
388 *
389 * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
390 * %pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
391 * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
392 * %pUL: 04030201-0605-0807-090A-0B0C0D0E0F10
393 */
uuid_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags,const char * fmt)394 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
395 int precision, int flags, const char *fmt)
396 {
397 char uuid[UUID_STR_LEN + 1];
398 int str_format;
399
400 switch (*(++fmt)) {
401 case 'L':
402 str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
403 break;
404 case 'l':
405 str_format = UUID_STR_FORMAT_GUID;
406 break;
407 case 'B':
408 str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
409 break;
410 default:
411 str_format = UUID_STR_FORMAT_STD;
412 break;
413 }
414
415 if (addr)
416 uuid_bin_to_str(addr, uuid, str_format);
417 else
418 strcpy(uuid, "<NULL>");
419
420 return string(buf, end, uuid, field_width, precision, flags);
421 }
422 #endif
423
424 /*
425 * Show a '%p' thing. A kernel extension is that the '%p' is followed
426 * by an extra set of alphanumeric characters that are extended format
427 * specifiers.
428 *
429 * Right now we handle:
430 *
431 * - 'M' For a 6-byte MAC address, it prints the address in the
432 * usual colon-separated hex notation
433 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
434 * decimal for v4 and colon separated network-order 16 bit hex for v6)
435 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
436 * currently the same
437 *
438 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
439 * function pointers are really function descriptors, which contain a
440 * pointer to the real address.
441 */
pointer(const char * fmt,char * buf,char * end,void * ptr,int field_width,int precision,int flags)442 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
443 int field_width, int precision, int flags)
444 {
445 u64 num = (uintptr_t)ptr;
446
447 /*
448 * Being a boot loader, we explicitly allow pointers to
449 * (physical) address null.
450 */
451 #if 0
452 if (!ptr)
453 return string(buf, end, "(null)", field_width, precision,
454 flags);
455 #endif
456
457 switch (*fmt) {
458 /* Device paths only exist in the EFI context. */
459 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
460 case 'D':
461 return device_path_string(buf, end, ptr, field_width,
462 precision, flags);
463 #endif
464 case 'a':
465 flags |= SPECIAL | ZEROPAD;
466
467 switch (fmt[1]) {
468 case 'p':
469 default:
470 field_width = sizeof(phys_addr_t) * 2 + 2;
471 num = *(phys_addr_t *)ptr;
472 break;
473 }
474 break;
475 case 'm':
476 flags |= SPECIAL;
477 /* Fallthrough */
478 case 'M':
479 return mac_address_string(buf, end, ptr, field_width,
480 precision, flags);
481 case 'i':
482 flags |= SPECIAL;
483 /* Fallthrough */
484 case 'I':
485 if (fmt[1] == '6')
486 return ip6_addr_string(buf, end, ptr, field_width,
487 precision, flags);
488 if (fmt[1] == '4')
489 return ip4_addr_string(buf, end, ptr, field_width,
490 precision, flags);
491 flags &= ~SPECIAL;
492 break;
493 #ifdef CONFIG_LIB_UUID
494 case 'U':
495 return uuid_string(buf, end, ptr, field_width, precision,
496 flags, fmt);
497 #endif
498 default:
499 break;
500 }
501 flags |= SMALL;
502 if (field_width == -1) {
503 field_width = 2*sizeof(void *);
504 flags |= ZEROPAD;
505 }
506 return number(buf, end, num, 16, field_width, precision, flags);
507 }
508
vsnprintf_internal(char * buf,size_t size,const char * fmt,va_list args)509 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
510 va_list args)
511 {
512 u64 num;
513 int base;
514 char *str;
515
516 int flags; /* flags to number() */
517
518 int field_width; /* width of output field */
519 int precision; /* min. # of digits for integers; max
520 number of chars for from string */
521 int qualifier; /* 'h', 'l', or 'L' for integer fields */
522 /* 'z' support added 23/7/1999 S.H. */
523 /* 'z' changed to 'Z' --davidm 1/25/99 */
524 /* 't' added for ptrdiff_t */
525 char *end = buf + size;
526
527 /* Make sure end is always >= buf - do we want this in U-Boot? */
528 if (end < buf) {
529 end = ((void *)-1);
530 size = end - buf;
531 }
532 str = buf;
533
534 for (; *fmt ; ++fmt) {
535 if (*fmt != '%') {
536 ADDCH(str, *fmt);
537 continue;
538 }
539
540 /* process flags */
541 flags = 0;
542 repeat:
543 ++fmt; /* this also skips first '%' */
544 switch (*fmt) {
545 case '-':
546 flags |= LEFT;
547 goto repeat;
548 case '+':
549 flags |= PLUS;
550 goto repeat;
551 case ' ':
552 flags |= SPACE;
553 goto repeat;
554 case '#':
555 flags |= SPECIAL;
556 goto repeat;
557 case '0':
558 flags |= ZEROPAD;
559 goto repeat;
560 }
561
562 /* get field width */
563 field_width = -1;
564 if (is_digit(*fmt))
565 field_width = skip_atoi(&fmt);
566 else if (*fmt == '*') {
567 ++fmt;
568 /* it's the next argument */
569 field_width = va_arg(args, int);
570 if (field_width < 0) {
571 field_width = -field_width;
572 flags |= LEFT;
573 }
574 }
575
576 /* get the precision */
577 precision = -1;
578 if (*fmt == '.') {
579 ++fmt;
580 if (is_digit(*fmt))
581 precision = skip_atoi(&fmt);
582 else if (*fmt == '*') {
583 ++fmt;
584 /* it's the next argument */
585 precision = va_arg(args, int);
586 }
587 if (precision < 0)
588 precision = 0;
589 }
590
591 /* get the conversion qualifier */
592 qualifier = -1;
593 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
594 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
595 qualifier = *fmt;
596 ++fmt;
597 if (qualifier == 'l' && *fmt == 'l') {
598 qualifier = 'L';
599 ++fmt;
600 }
601 }
602
603 /* default base */
604 base = 10;
605
606 switch (*fmt) {
607 case 'c':
608 if (!(flags & LEFT)) {
609 while (--field_width > 0)
610 ADDCH(str, ' ');
611 }
612 ADDCH(str, (unsigned char) va_arg(args, int));
613 while (--field_width > 0)
614 ADDCH(str, ' ');
615 continue;
616
617 case 's':
618 /* U-Boot uses UTF-16 strings in the EFI context only. */
619 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
620 if (qualifier == 'l') {
621 str = string16(str, end, va_arg(args, u16 *),
622 field_width, precision, flags);
623 } else
624 #endif
625 {
626 str = string(str, end, va_arg(args, char *),
627 field_width, precision, flags);
628 }
629 continue;
630
631 case 'p':
632 str = pointer(fmt + 1, str, end,
633 va_arg(args, void *),
634 field_width, precision, flags);
635 if (IS_ERR(str))
636 return PTR_ERR(str);
637 /* Skip all alphanumeric pointer suffixes */
638 while (isalnum(fmt[1]))
639 fmt++;
640 continue;
641
642 case 'n':
643 if (qualifier == 'l') {
644 long *ip = va_arg(args, long *);
645 *ip = (str - buf);
646 } else {
647 int *ip = va_arg(args, int *);
648 *ip = (str - buf);
649 }
650 continue;
651
652 case '%':
653 ADDCH(str, '%');
654 continue;
655
656 /* integer number formats - set up the flags and "break" */
657 case 'o':
658 base = 8;
659 break;
660
661 case 'x':
662 flags |= SMALL;
663 case 'X':
664 base = 16;
665 break;
666
667 case 'd':
668 case 'i':
669 flags |= SIGN;
670 case 'u':
671 break;
672
673 default:
674 ADDCH(str, '%');
675 if (*fmt)
676 ADDCH(str, *fmt);
677 else
678 --fmt;
679 continue;
680 }
681 if (qualifier == 'L') /* "quad" for 64 bit variables */
682 num = va_arg(args, unsigned long long);
683 else if (qualifier == 'l') {
684 num = va_arg(args, unsigned long);
685 if (flags & SIGN)
686 num = (signed long) num;
687 } else if (qualifier == 'Z' || qualifier == 'z') {
688 num = va_arg(args, size_t);
689 } else if (qualifier == 't') {
690 num = va_arg(args, ptrdiff_t);
691 } else if (qualifier == 'h') {
692 num = (unsigned short) va_arg(args, int);
693 if (flags & SIGN)
694 num = (signed short) num;
695 } else {
696 num = va_arg(args, unsigned int);
697 if (flags & SIGN)
698 num = (signed int) num;
699 }
700 str = number(str, end, num, base, field_width, precision,
701 flags);
702 }
703
704 if (size > 0) {
705 ADDCH(str, '\0');
706 if (str > end)
707 end[-1] = '\0';
708 --str;
709 }
710 /* the trailing null byte doesn't count towards the total */
711 return str - buf;
712 }
713
vsnprintf(char * buf,size_t size,const char * fmt,va_list args)714 int vsnprintf(char *buf, size_t size, const char *fmt,
715 va_list args)
716 {
717 return vsnprintf_internal(buf, size, fmt, args);
718 }
719
vscnprintf(char * buf,size_t size,const char * fmt,va_list args)720 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
721 {
722 int i;
723
724 i = vsnprintf(buf, size, fmt, args);
725
726 if (likely(i < size))
727 return i;
728 if (size != 0)
729 return size - 1;
730 return 0;
731 }
732
snprintf(char * buf,size_t size,const char * fmt,...)733 int snprintf(char *buf, size_t size, const char *fmt, ...)
734 {
735 va_list args;
736 int i;
737
738 va_start(args, fmt);
739 i = vsnprintf(buf, size, fmt, args);
740 va_end(args);
741
742 return i;
743 }
744
scnprintf(char * buf,size_t size,const char * fmt,...)745 int scnprintf(char *buf, size_t size, const char *fmt, ...)
746 {
747 va_list args;
748 int i;
749
750 va_start(args, fmt);
751 i = vscnprintf(buf, size, fmt, args);
752 va_end(args);
753
754 return i;
755 }
756
757 /**
758 * Format a string and place it in a buffer (va_list version)
759 *
760 * @param buf The buffer to place the result into
761 * @param fmt The format string to use
762 * @param args Arguments for the format string
763 *
764 * The function returns the number of characters written
765 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
766 * buffer overflows.
767 *
768 * If you're not already dealing with a va_list consider using sprintf().
769 */
vsprintf(char * buf,const char * fmt,va_list args)770 int vsprintf(char *buf, const char *fmt, va_list args)
771 {
772 return vsnprintf_internal(buf, INT_MAX, fmt, args);
773 }
774
sprintf(char * buf,const char * fmt,...)775 int sprintf(char *buf, const char *fmt, ...)
776 {
777 va_list args;
778 int i;
779
780 va_start(args, fmt);
781 i = vsprintf(buf, fmt, args);
782 va_end(args);
783 return i;
784 }
785
786 #if CONFIG_IS_ENABLED(PRINTF)
printf(const char * fmt,...)787 int printf(const char *fmt, ...)
788 {
789 va_list args;
790 uint i;
791 char printbuffer[CONFIG_SYS_PBSIZE];
792
793 va_start(args, fmt);
794
795 /*
796 * For this to work, printbuffer must be larger than
797 * anything we ever want to print.
798 */
799 i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
800 va_end(args);
801
802 /* Handle error */
803 if (i <= 0)
804 return i;
805 /* Print the string */
806 puts(printbuffer);
807 return i;
808 }
809
vprintf(const char * fmt,va_list args)810 int vprintf(const char *fmt, va_list args)
811 {
812 uint i;
813 char printbuffer[CONFIG_SYS_PBSIZE];
814
815 /*
816 * For this to work, printbuffer must be larger than
817 * anything we ever want to print.
818 */
819 i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
820
821 /* Handle error */
822 if (i <= 0)
823 return i;
824 /* Print the string */
825 puts(printbuffer);
826 return i;
827 }
828 #endif
829
simple_itoa(ulong i)830 char *simple_itoa(ulong i)
831 {
832 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
833 static char local[22];
834 char *p = &local[21];
835
836 *p-- = '\0';
837 do {
838 *p-- = '0' + i % 10;
839 i /= 10;
840 } while (i > 0);
841 return p + 1;
842 }
843
844 /* We don't seem to have %'d in U-Boot */
print_grouped_ull(unsigned long long int_val,int digits)845 void print_grouped_ull(unsigned long long int_val, int digits)
846 {
847 char str[21], *s;
848 int grab = 3;
849
850 digits = (digits + 2) / 3;
851 sprintf(str, "%*llu", digits * 3, int_val);
852 for (s = str; *s; s += grab) {
853 if (s != str)
854 putc(s[-1] != ' ' ? ',' : ' ');
855 printf("%.*s", grab, s);
856 grab = 3;
857 }
858 }
859
str2off(const char * p,loff_t * num)860 bool str2off(const char *p, loff_t *num)
861 {
862 char *endptr;
863
864 *num = simple_strtoull(p, &endptr, 16);
865 return *p != '\0' && *endptr == '\0';
866 }
867
str2long(const char * p,ulong * num)868 bool str2long(const char *p, ulong *num)
869 {
870 char *endptr;
871
872 *num = simple_strtoul(p, &endptr, 16);
873 return *p != '\0' && *endptr == '\0';
874 }
875
strmhz(char * buf,unsigned long hz)876 char *strmhz(char *buf, unsigned long hz)
877 {
878 long l, n;
879 long m;
880
881 n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
882 l = sprintf(buf, "%ld", n);
883
884 hz -= n * 1000000L;
885 m = DIV_ROUND_CLOSEST(hz, 1000L);
886 if (m != 0)
887 sprintf(buf + l, ".%03ld", m);
888
889 return buf;
890 }
891