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 <uuid.h>
23 #include <vsprintf.h>
24 #include <linux/ctype.h>
25 #include <linux/err.h>
26 #include <linux/types.h>
27 #include <linux/string.h>
28
29 /* we use this so that we can do without the ctype library */
30 #define is_digit(c) ((c) >= '0' && (c) <= '9')
31
skip_atoi(const char ** s)32 static int skip_atoi(const char **s)
33 {
34 int i = 0;
35
36 while (is_digit(**s))
37 i = i * 10 + *((*s)++) - '0';
38
39 return i;
40 }
41
42 /* Decimal conversion is by far the most typical, and is used
43 * for /proc and /sys data. This directly impacts e.g. top performance
44 * with many processes running. We optimize it for speed
45 * using code from
46 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
47 * (with permission from the author, Douglas W. Jones). */
48
49 /* Formats correctly any integer in [0,99999].
50 * Outputs from one to five digits depending on input.
51 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
put_dec_trunc(char * buf,unsigned q)52 static char *put_dec_trunc(char *buf, unsigned q)
53 {
54 unsigned d3, d2, d1, d0;
55 d1 = (q>>4) & 0xf;
56 d2 = (q>>8) & 0xf;
57 d3 = (q>>12);
58
59 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
60 q = (d0 * 0xcd) >> 11;
61 d0 = d0 - 10*q;
62 *buf++ = d0 + '0'; /* least significant digit */
63 d1 = q + 9*d3 + 5*d2 + d1;
64 if (d1 != 0) {
65 q = (d1 * 0xcd) >> 11;
66 d1 = d1 - 10*q;
67 *buf++ = d1 + '0'; /* next digit */
68
69 d2 = q + 2*d2;
70 if ((d2 != 0) || (d3 != 0)) {
71 q = (d2 * 0xd) >> 7;
72 d2 = d2 - 10*q;
73 *buf++ = d2 + '0'; /* next digit */
74
75 d3 = q + 4*d3;
76 if (d3 != 0) {
77 q = (d3 * 0xcd) >> 11;
78 d3 = d3 - 10*q;
79 *buf++ = d3 + '0'; /* next digit */
80 if (q != 0)
81 *buf++ = q + '0'; /* most sign. digit */
82 }
83 }
84 }
85 return buf;
86 }
87 /* Same with if's removed. Always emits five digits */
put_dec_full(char * buf,unsigned q)88 static char *put_dec_full(char *buf, unsigned q)
89 {
90 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
91 /* but anyway, gcc produces better code with full-sized ints */
92 unsigned d3, d2, d1, d0;
93 d1 = (q>>4) & 0xf;
94 d2 = (q>>8) & 0xf;
95 d3 = (q>>12);
96
97 /*
98 * Possible ways to approx. divide by 10
99 * gcc -O2 replaces multiply with shifts and adds
100 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
101 * (x * 0x67) >> 10: 1100111
102 * (x * 0x34) >> 9: 110100 - same
103 * (x * 0x1a) >> 8: 11010 - same
104 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
105 */
106
107 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
108 q = (d0 * 0xcd) >> 11;
109 d0 = d0 - 10*q;
110 *buf++ = d0 + '0';
111 d1 = q + 9*d3 + 5*d2 + d1;
112 q = (d1 * 0xcd) >> 11;
113 d1 = d1 - 10*q;
114 *buf++ = d1 + '0';
115
116 d2 = q + 2*d2;
117 q = (d2 * 0xd) >> 7;
118 d2 = d2 - 10*q;
119 *buf++ = d2 + '0';
120
121 d3 = q + 4*d3;
122 q = (d3 * 0xcd) >> 11; /* - shorter code */
123 /* q = (d3 * 0x67) >> 10; - would also work */
124 d3 = d3 - 10*q;
125 *buf++ = d3 + '0';
126 *buf++ = q + '0';
127 return buf;
128 }
129 /* No inlining helps gcc to use registers better */
put_dec(char * buf,uint64_t num)130 static noinline char *put_dec(char *buf, uint64_t num)
131 {
132 while (1) {
133 unsigned rem;
134 if (num < 100000)
135 return put_dec_trunc(buf, num);
136 rem = do_div(num, 100000);
137 buf = put_dec_full(buf, rem);
138 }
139 }
140
141 #define ZEROPAD 1 /* pad with zero */
142 #define SIGN 2 /* unsigned/signed long */
143 #define PLUS 4 /* show plus */
144 #define SPACE 8 /* space if plus */
145 #define LEFT 16 /* left justified */
146 #define SMALL 32 /* Must be 32 == 0x20 */
147 #define SPECIAL 64 /* 0x */
148
149 /*
150 * Macro to add a new character to our output string, but only if it will
151 * fit. The macro moves to the next character position in the output string.
152 */
153 #define ADDCH(str, ch) do { \
154 if ((str) < end) \
155 *(str) = (ch); \
156 ++str; \
157 } while (0)
158
number(char * buf,char * end,u64 num,int base,int size,int precision,int type)159 static char *number(char *buf, char *end, u64 num,
160 int base, int size, int precision, int type)
161 {
162 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
163 static const char digits[16] = "0123456789ABCDEF";
164
165 char tmp[66];
166 char sign;
167 char locase;
168 int need_pfx = ((type & SPECIAL) && base != 10);
169 int i;
170
171 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
172 * produces same digits or (maybe lowercased) letters */
173 locase = (type & SMALL);
174 if (type & LEFT)
175 type &= ~ZEROPAD;
176 sign = 0;
177 if (type & SIGN) {
178 if ((s64) num < 0) {
179 sign = '-';
180 num = -(s64) num;
181 size--;
182 } else if (type & PLUS) {
183 sign = '+';
184 size--;
185 } else if (type & SPACE) {
186 sign = ' ';
187 size--;
188 }
189 }
190 if (need_pfx) {
191 size--;
192 if (base == 16)
193 size--;
194 }
195
196 /* generate full string in tmp[], in reverse order */
197 i = 0;
198 if (num == 0)
199 tmp[i++] = '0';
200 /* Generic code, for any base:
201 else do {
202 tmp[i++] = (digits[do_div(num,base)] | locase);
203 } while (num != 0);
204 */
205 else if (base != 10) { /* 8 or 16 */
206 int mask = base - 1;
207 int shift = 3;
208
209 if (base == 16)
210 shift = 4;
211
212 do {
213 tmp[i++] = (digits[((unsigned char)num) & mask]
214 | locase);
215 num >>= shift;
216 } while (num);
217 } else { /* base 10 */
218 i = put_dec(tmp, num) - tmp;
219 }
220
221 /* printing 100 using %2d gives "100", not "00" */
222 if (i > precision)
223 precision = i;
224 /* leading space padding */
225 size -= precision;
226 if (!(type & (ZEROPAD + LEFT))) {
227 while (--size >= 0)
228 ADDCH(buf, ' ');
229 }
230 /* sign */
231 if (sign)
232 ADDCH(buf, sign);
233 /* "0x" / "0" prefix */
234 if (need_pfx) {
235 ADDCH(buf, '0');
236 if (base == 16)
237 ADDCH(buf, 'X' | locase);
238 }
239 /* zero or space padding */
240 if (!(type & LEFT)) {
241 char c = (type & ZEROPAD) ? '0' : ' ';
242
243 while (--size >= 0)
244 ADDCH(buf, c);
245 }
246 /* hmm even more zero padding? */
247 while (i <= --precision)
248 ADDCH(buf, '0');
249 /* actual digits of result */
250 while (--i >= 0)
251 ADDCH(buf, tmp[i]);
252 /* trailing space padding */
253 while (--size >= 0)
254 ADDCH(buf, ' ');
255 return buf;
256 }
257
string(char * buf,char * end,char * s,int field_width,int precision,int flags)258 static char *string(char *buf, char *end, char *s, int field_width,
259 int precision, int flags)
260 {
261 int len, i;
262
263 if (s == NULL)
264 s = "<NULL>";
265
266 len = strnlen(s, precision);
267
268 if (!(flags & LEFT))
269 while (len < field_width--)
270 ADDCH(buf, ' ');
271 for (i = 0; i < len; ++i)
272 ADDCH(buf, *s++);
273 while (len < field_width--)
274 ADDCH(buf, ' ');
275 return buf;
276 }
277
278 /* U-Boot uses UTF-16 strings in the EFI context only. */
279 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
string16(char * buf,char * end,u16 * s,int field_width,int precision,int flags)280 static char *string16(char *buf, char *end, u16 *s, int field_width,
281 int precision, int flags)
282 {
283 const u16 *str = s ? s : L"<NULL>";
284 ssize_t i, len = utf16_strnlen(str, precision);
285
286 if (!(flags & LEFT))
287 for (; len < field_width; --field_width)
288 ADDCH(buf, ' ');
289 for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
290 s32 s = utf16_get(&str);
291
292 if (s < 0)
293 s = '?';
294 utf8_put(s, &buf);
295 }
296 for (; len < field_width; --field_width)
297 ADDCH(buf, ' ');
298 return buf;
299 }
300
301 #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)302 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
303 int precision, int flags)
304 {
305 u16 *str;
306
307 /* If dp == NULL output the string '<NULL>' */
308 if (!dp)
309 return string16(buf, end, dp, field_width, precision, flags);
310
311 str = efi_dp_str((struct efi_device_path *)dp);
312 if (!str)
313 return ERR_PTR(-ENOMEM);
314
315 buf = string16(buf, end, str, field_width, precision, flags);
316 efi_free_pool(str);
317 return buf;
318 }
319 #endif
320 #endif
321
mac_address_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)322 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
323 int precision, int flags)
324 {
325 /* (6 * 2 hex digits), 5 colons and trailing zero */
326 char mac_addr[6 * 3];
327 char *p = mac_addr;
328 int i;
329
330 for (i = 0; i < 6; i++) {
331 p = hex_byte_pack(p, addr[i]);
332 if (!(flags & SPECIAL) && i != 5)
333 *p++ = ':';
334 }
335 *p = '\0';
336
337 return string(buf, end, mac_addr, field_width, precision,
338 flags & ~SPECIAL);
339 }
340
ip6_addr_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)341 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
342 int precision, int flags)
343 {
344 /* (8 * 4 hex digits), 7 colons and trailing zero */
345 char ip6_addr[8 * 5];
346 char *p = ip6_addr;
347 int i;
348
349 for (i = 0; i < 8; i++) {
350 p = hex_byte_pack(p, addr[2 * i]);
351 p = hex_byte_pack(p, addr[2 * i + 1]);
352 if (!(flags & SPECIAL) && i != 7)
353 *p++ = ':';
354 }
355 *p = '\0';
356
357 return string(buf, end, ip6_addr, field_width, precision,
358 flags & ~SPECIAL);
359 }
360
ip4_addr_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)361 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
362 int precision, int flags)
363 {
364 /* (4 * 3 decimal digits), 3 dots and trailing zero */
365 char ip4_addr[4 * 4];
366 char temp[3]; /* hold each IP quad in reverse order */
367 char *p = ip4_addr;
368 int i, digits;
369
370 for (i = 0; i < 4; i++) {
371 digits = put_dec_trunc(temp, addr[i]) - temp;
372 /* reverse the digits in the quad */
373 while (digits--)
374 *p++ = temp[digits];
375 if (i != 3)
376 *p++ = '.';
377 }
378 *p = '\0';
379
380 return string(buf, end, ip4_addr, field_width, precision,
381 flags & ~SPECIAL);
382 }
383
384 #ifdef CONFIG_LIB_UUID
385 /*
386 * This works (roughly) the same way as Linux's.
387 *
388 * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
389 * %pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
390 * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
391 * %pUL: 04030201-0605-0807-090A-0B0C0D0E0F10
392 */
uuid_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags,const char * fmt)393 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
394 int precision, int flags, const char *fmt)
395 {
396 char uuid[UUID_STR_LEN + 1];
397 int str_format;
398
399 switch (*(++fmt)) {
400 case 'L':
401 str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
402 break;
403 case 'l':
404 str_format = UUID_STR_FORMAT_GUID;
405 break;
406 case 'B':
407 str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
408 break;
409 default:
410 str_format = UUID_STR_FORMAT_STD;
411 break;
412 }
413
414 if (addr)
415 uuid_bin_to_str(addr, uuid, str_format);
416 else
417 strcpy(uuid, "<NULL>");
418
419 return string(buf, end, uuid, field_width, precision, flags);
420 }
421 #endif
422
423 /*
424 * Show a '%p' thing. A kernel extension is that the '%p' is followed
425 * by an extra set of alphanumeric characters that are extended format
426 * specifiers.
427 *
428 * Right now we handle:
429 *
430 * - 'M' For a 6-byte MAC address, it prints the address in the
431 * usual colon-separated hex notation
432 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
433 * decimal for v4 and colon separated network-order 16 bit hex for v6)
434 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
435 * currently the same
436 *
437 * Note: IPv6 support is currently if(0)'ed out. If you ever need
438 * %pI6, please add an IPV6 Kconfig knob, make your code select or
439 * depend on that, and change the 0 below to CONFIG_IS_ENABLED(IPV6).
440 */
pointer(const char * fmt,char * buf,char * end,void * ptr,int field_width,int precision,int flags)441 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
442 int field_width, int precision, int flags)
443 {
444 u64 num = (uintptr_t)ptr;
445
446 /*
447 * Being a boot loader, we explicitly allow pointers to
448 * (physical) address null.
449 */
450 #if 0
451 if (!ptr)
452 return string(buf, end, "(null)", field_width, precision,
453 flags);
454 #endif
455
456 switch (*fmt) {
457 /* Device paths only exist in the EFI context. */
458 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
459 case 'D':
460 return device_path_string(buf, end, ptr, field_width,
461 precision, flags);
462 #endif
463 case 'a':
464 flags |= SPECIAL | ZEROPAD;
465
466 switch (fmt[1]) {
467 case 'p':
468 default:
469 field_width = sizeof(phys_addr_t) * 2 + 2;
470 num = *(phys_addr_t *)ptr;
471 break;
472 }
473 break;
474 case 'm':
475 flags |= SPECIAL;
476 /* Fallthrough */
477 case 'M':
478 return mac_address_string(buf, end, ptr, field_width,
479 precision, flags);
480 case 'i':
481 flags |= SPECIAL;
482 /* Fallthrough */
483 case 'I':
484 /* %pI6 currently unused */
485 if (0 && 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
792 va_start(args, fmt);
793 i = vprintf(fmt, args);
794 va_end(args);
795
796 return i;
797 }
798
vprintf(const char * fmt,va_list args)799 int vprintf(const char *fmt, va_list args)
800 {
801 uint i;
802 char printbuffer[CONFIG_SYS_PBSIZE];
803
804 /*
805 * For this to work, printbuffer must be larger than
806 * anything we ever want to print.
807 */
808 i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
809
810 /* Handle error */
811 if (i <= 0)
812 return i;
813 /* Print the string */
814 puts(printbuffer);
815 return i;
816 }
817 #endif
818
simple_itoa(ulong i)819 char *simple_itoa(ulong i)
820 {
821 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
822 static char local[22];
823 char *p = &local[21];
824
825 *p-- = '\0';
826 do {
827 *p-- = '0' + i % 10;
828 i /= 10;
829 } while (i > 0);
830 return p + 1;
831 }
832
833 /* We don't seem to have %'d in U-Boot */
print_grouped_ull(unsigned long long int_val,int digits)834 void print_grouped_ull(unsigned long long int_val, int digits)
835 {
836 char str[21], *s;
837 int grab = 3;
838
839 digits = (digits + 2) / 3;
840 sprintf(str, "%*llu", digits * 3, int_val);
841 for (s = str; *s; s += grab) {
842 if (s != str)
843 putc(s[-1] != ' ' ? ',' : ' ');
844 printf("%.*s", grab, s);
845 grab = 3;
846 }
847 }
848
str2off(const char * p,loff_t * num)849 bool str2off(const char *p, loff_t *num)
850 {
851 char *endptr;
852
853 *num = simple_strtoull(p, &endptr, 16);
854 return *p != '\0' && *endptr == '\0';
855 }
856
str2long(const char * p,ulong * num)857 bool str2long(const char *p, ulong *num)
858 {
859 char *endptr;
860
861 *num = hextoul(p, &endptr);
862 return *p != '\0' && *endptr == '\0';
863 }
864
strmhz(char * buf,unsigned long hz)865 char *strmhz(char *buf, unsigned long hz)
866 {
867 long l, n;
868 long m;
869
870 n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
871 l = sprintf(buf, "%ld", n);
872
873 hz -= n * 1000000L;
874 m = DIV_ROUND_CLOSEST(hz, 1000L);
875 if (m != 0)
876 sprintf(buf + l, ".%03ld", m);
877
878 return buf;
879 }
880