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 #define ERRSTR 128 /* %dE showing error string if enabled */
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,const char * s,int field_width,int precision,int flags)259 static char *string(char *buf, char *end, const 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. */
string16(char * buf,char * end,u16 * s,int field_width,int precision,int flags)280 static __maybe_unused char *string16(char *buf, char *end, u16 *s,
281 int field_width, int precision, int flags)
282 {
283 const u16 *str = s ? s : u"<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 if (buf < end)
290 *buf = 0;
291 for (i = 0; i < len; ++i) {
292 int slen = utf16_utf8_strnlen(str, 1);
293 s32 s = utf16_get(&str);
294
295 if (s < 0)
296 s = '?';
297 if (buf + slen < end) {
298 utf8_put(s, &buf);
299 if (buf < end)
300 *buf = 0;
301 } else {
302 buf += slen;
303 }
304 }
305 for (; len < field_width; --field_width)
306 ADDCH(buf, ' ');
307
308 return buf;
309 }
310
311 #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)312 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
313 int precision, int flags)
314 {
315 u16 *str;
316
317 /* If dp == NULL output the string '<NULL>' */
318 if (!dp)
319 return string16(buf, end, dp, field_width, precision, flags);
320
321 str = efi_dp_str((struct efi_device_path *)dp);
322 if (!str)
323 return ERR_PTR(-ENOMEM);
324
325 buf = string16(buf, end, str, field_width, precision, flags);
326 efi_free_pool(str);
327 return buf;
328 }
329 #endif
330
mac_address_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)331 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
332 int precision, int flags)
333 {
334 /* (6 * 2 hex digits), 5 colons and trailing zero */
335 char mac_addr[6 * 3];
336 char *p = mac_addr;
337 int i;
338
339 for (i = 0; i < 6; i++) {
340 p = hex_byte_pack(p, addr[i]);
341 if (!(flags & SPECIAL) && i != 5)
342 *p++ = ':';
343 }
344 *p = '\0';
345
346 return string(buf, end, mac_addr, field_width, precision,
347 flags & ~SPECIAL);
348 }
349
ip6_addr_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)350 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
351 int precision, int flags)
352 {
353 /* (8 * 4 hex digits), 7 colons and trailing zero */
354 char ip6_addr[8 * 5];
355 char *p = ip6_addr;
356 int i;
357
358 for (i = 0; i < 8; i++) {
359 p = hex_byte_pack(p, addr[2 * i]);
360 p = hex_byte_pack(p, addr[2 * i + 1]);
361 if (!(flags & SPECIAL) && i != 7)
362 *p++ = ':';
363 }
364 *p = '\0';
365
366 return string(buf, end, ip6_addr, field_width, precision,
367 flags & ~SPECIAL);
368 }
369
ip4_addr_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags)370 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
371 int precision, int flags)
372 {
373 /* (4 * 3 decimal digits), 3 dots and trailing zero */
374 char ip4_addr[4 * 4];
375 char temp[3]; /* hold each IP quad in reverse order */
376 char *p = ip4_addr;
377 int i, digits;
378
379 for (i = 0; i < 4; i++) {
380 digits = put_dec_trunc(temp, addr[i]) - temp;
381 /* reverse the digits in the quad */
382 while (digits--)
383 *p++ = temp[digits];
384 if (i != 3)
385 *p++ = '.';
386 }
387 *p = '\0';
388
389 return string(buf, end, ip4_addr, field_width, precision,
390 flags & ~SPECIAL);
391 }
392
393 #ifdef CONFIG_LIB_UUID
394 /*
395 * This works (roughly) the same way as Linux's.
396 *
397 * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
398 * %pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
399 * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
400 * %pUL: 04030201-0605-0807-090A-0B0C0D0E0F10
401 * %pUs: GUID text representation if known or fallback to %pUl
402 */
uuid_string(char * buf,char * end,u8 * addr,int field_width,int precision,int flags,const char * fmt)403 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
404 int precision, int flags, const char *fmt)
405 {
406 char uuid[UUID_STR_LEN + 1];
407 int str_format;
408 const char *str;
409
410 switch (*(++fmt)) {
411 case 'L':
412 str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
413 break;
414 case 'l':
415 str_format = UUID_STR_FORMAT_GUID;
416 break;
417 case 'B':
418 str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
419 break;
420 case 's':
421 str = uuid_guid_get_str(addr);
422 if (str)
423 return string(buf, end, str,
424 field_width, precision, flags);
425 str_format = UUID_STR_FORMAT_GUID;
426 break;
427 default:
428 str_format = UUID_STR_FORMAT_STD;
429 break;
430 }
431
432 if (addr)
433 uuid_bin_to_str(addr, uuid, str_format);
434 else
435 strcpy(uuid, "<NULL>");
436
437 return string(buf, end, uuid, field_width, precision, flags);
438 }
439 #endif
440
441 /*
442 * Show a '%p' thing. A kernel extension is that the '%p' is followed
443 * by an extra set of alphanumeric characters that are extended format
444 * specifiers.
445 *
446 * Right now we handle:
447 *
448 * - 'M' For a 6-byte MAC address, it prints the address in the
449 * usual colon-separated hex notation
450 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
451 * decimal for v4 and colon separated network-order 16 bit hex for v6)
452 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
453 * currently the same
454 */
pointer(const char * fmt,char * buf,char * end,void * ptr,int field_width,int precision,int flags)455 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
456 int field_width, int precision, int flags)
457 {
458 u64 num = (uintptr_t)ptr;
459
460 /*
461 * Being a boot loader, we explicitly allow pointers to
462 * (physical) address null.
463 */
464 #if 0
465 if (!ptr)
466 return string(buf, end, "(null)", field_width, precision,
467 flags);
468 #endif
469
470 switch (*fmt) {
471 /* Device paths only exist in the EFI context. */
472 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
473 case 'D':
474 return device_path_string(buf, end, ptr, field_width,
475 precision, flags);
476 #endif
477 case 'a':
478 flags |= SPECIAL | ZEROPAD;
479
480 switch (fmt[1]) {
481 case 'p':
482 default:
483 field_width = sizeof(phys_addr_t) * 2 + 2;
484 num = *(phys_addr_t *)ptr;
485 break;
486 }
487 break;
488 case 'm':
489 flags |= SPECIAL;
490 /* Fallthrough */
491 case 'M':
492 return mac_address_string(buf, end, ptr, field_width,
493 precision, flags);
494 case 'i':
495 flags |= SPECIAL;
496 /* Fallthrough */
497 case 'I':
498 if (IS_ENABLED(CONFIG_IPV6) && fmt[1] == '6')
499 return ip6_addr_string(buf, end, ptr, field_width,
500 precision, flags);
501 if (fmt[1] == '4')
502 return ip4_addr_string(buf, end, ptr, field_width,
503 precision, flags);
504 flags &= ~SPECIAL;
505 break;
506 #ifdef CONFIG_LIB_UUID
507 case 'U':
508 return uuid_string(buf, end, ptr, field_width, precision,
509 flags, fmt);
510 #endif
511 default:
512 break;
513 }
514 flags |= SMALL;
515 if (field_width == -1) {
516 field_width = 2*sizeof(void *);
517 flags |= ZEROPAD;
518 }
519 return number(buf, end, num, 16, field_width, precision, flags);
520 }
521
vsnprintf_internal(char * buf,size_t size,const char * fmt,va_list args)522 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
523 va_list args)
524 {
525 u64 num;
526 int base;
527 char *str;
528
529 int flags; /* flags to number() */
530
531 int field_width; /* width of output field */
532 int precision; /* min. # of digits for integers; max
533 number of chars for from string */
534 int qualifier; /* 'h', 'l', or 'L' for integer fields */
535 /* 'z' support added 23/7/1999 S.H. */
536 /* 'z' changed to 'Z' --davidm 1/25/99 */
537 /* 't' added for ptrdiff_t */
538 char *end = buf + size;
539
540 /* Make sure end is always >= buf - do we want this in U-Boot? */
541 if (end < buf) {
542 end = ((void *)-1);
543 size = end - buf;
544 }
545 str = buf;
546
547 for (; *fmt ; ++fmt) {
548 if (*fmt != '%') {
549 ADDCH(str, *fmt);
550 continue;
551 }
552
553 /* process flags */
554 flags = 0;
555 repeat:
556 ++fmt; /* this also skips first '%' */
557 switch (*fmt) {
558 case '-':
559 flags |= LEFT;
560 goto repeat;
561 case '+':
562 flags |= PLUS;
563 goto repeat;
564 case ' ':
565 flags |= SPACE;
566 goto repeat;
567 case '#':
568 flags |= SPECIAL;
569 goto repeat;
570 case '0':
571 flags |= ZEROPAD;
572 goto repeat;
573 }
574
575 /* get field width */
576 field_width = -1;
577 if (is_digit(*fmt))
578 field_width = skip_atoi(&fmt);
579 else if (*fmt == '*') {
580 ++fmt;
581 /* it's the next argument */
582 field_width = va_arg(args, int);
583 if (field_width < 0) {
584 field_width = -field_width;
585 flags |= LEFT;
586 }
587 }
588
589 /* get the precision */
590 precision = -1;
591 if (*fmt == '.') {
592 ++fmt;
593 if (is_digit(*fmt))
594 precision = skip_atoi(&fmt);
595 else if (*fmt == '*') {
596 ++fmt;
597 /* it's the next argument */
598 precision = va_arg(args, int);
599 }
600 if (precision < 0)
601 precision = 0;
602 }
603
604 /* get the conversion qualifier */
605 qualifier = -1;
606 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
607 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
608 qualifier = *fmt;
609 ++fmt;
610 if (qualifier == 'l' && *fmt == 'l') {
611 qualifier = 'L';
612 ++fmt;
613 }
614 }
615
616 /* default base */
617 base = 10;
618
619 switch (*fmt) {
620 case 'c':
621 if (!(flags & LEFT)) {
622 while (--field_width > 0)
623 ADDCH(str, ' ');
624 }
625 ADDCH(str, (unsigned char) va_arg(args, int));
626 while (--field_width > 0)
627 ADDCH(str, ' ');
628 continue;
629
630 case 's':
631 /* U-Boot uses UTF-16 strings in the EFI context only. */
632 #if (CONFIG_IS_ENABLED(EFI_LOADER) || IS_ENABLED(CONFIG_EFI_APP)) && \
633 !defined(API_BUILD)
634 if (qualifier == 'l') {
635 str = string16(str, end, va_arg(args, u16 *),
636 field_width, precision, flags);
637 } else
638 #endif
639 {
640 str = string(str, end, va_arg(args, char *),
641 field_width, precision, flags);
642 }
643 continue;
644
645 case 'p':
646 str = pointer(fmt + 1, str, end,
647 va_arg(args, void *),
648 field_width, precision, flags);
649 if (IS_ERR(str))
650 return PTR_ERR(str);
651 /* Skip all alphanumeric pointer suffixes */
652 while (isalnum(fmt[1]))
653 fmt++;
654 continue;
655
656 case 'n':
657 if (qualifier == 'l') {
658 long *ip = va_arg(args, long *);
659 *ip = (str - buf);
660 } else {
661 int *ip = va_arg(args, int *);
662 *ip = (str - buf);
663 }
664 continue;
665
666 case '%':
667 ADDCH(str, '%');
668 continue;
669
670 /* integer number formats - set up the flags and "break" */
671 case 'o':
672 base = 8;
673 break;
674
675 case 'x':
676 flags |= SMALL;
677 /* fallthrough */
678 case 'X':
679 base = 16;
680 break;
681
682 case 'd':
683 if (fmt[1] == 'E')
684 flags |= ERRSTR;
685 /* fallthrough */
686 case 'i':
687 flags |= SIGN;
688 /* fallthrough */
689 case 'u':
690 break;
691
692 default:
693 ADDCH(str, '%');
694 if (*fmt)
695 ADDCH(str, *fmt);
696 else
697 --fmt;
698 continue;
699 }
700 if (qualifier == 'L') /* "quad" for 64 bit variables */
701 num = va_arg(args, unsigned long long);
702 else if (qualifier == 'l') {
703 num = va_arg(args, unsigned long);
704 if (flags & SIGN)
705 num = (signed long) num;
706 } else if (qualifier == 'Z' || qualifier == 'z') {
707 num = va_arg(args, size_t);
708 } else if (qualifier == 't') {
709 num = va_arg(args, ptrdiff_t);
710 } else if (qualifier == 'h') {
711 num = (unsigned short) va_arg(args, int);
712 if (flags & SIGN)
713 num = (signed short) num;
714 } else {
715 num = va_arg(args, unsigned int);
716 if (flags & SIGN)
717 num = (signed int) num;
718 }
719 str = number(str, end, num, base, field_width, precision,
720 flags);
721 if (IS_ENABLED(CONFIG_ERRNO_STR) && (flags & ERRSTR)) {
722 const char *p;
723
724 ADDCH(str, ':');
725 ADDCH(str, ' ');
726 for (p = errno_str(num); *p; p++)
727 ADDCH(str, *p);
728 fmt++;
729 }
730 }
731
732 if (size > 0) {
733 ADDCH(str, '\0');
734 if (str > end)
735 end[-1] = '\0';
736 --str;
737 }
738 /* the trailing null byte doesn't count towards the total */
739 return str - buf;
740 }
741
vsnprintf(char * buf,size_t size,const char * fmt,va_list args)742 int vsnprintf(char *buf, size_t size, const char *fmt,
743 va_list args)
744 {
745 return vsnprintf_internal(buf, size, fmt, args);
746 }
747
vscnprintf(char * buf,size_t size,const char * fmt,va_list args)748 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
749 {
750 int i;
751
752 i = vsnprintf(buf, size, fmt, args);
753
754 if (likely(i < size))
755 return i;
756 if (size != 0)
757 return size - 1;
758 return 0;
759 }
760
snprintf(char * buf,size_t size,const char * fmt,...)761 int snprintf(char *buf, size_t size, const char *fmt, ...)
762 {
763 va_list args;
764 int i;
765
766 va_start(args, fmt);
767 i = vsnprintf(buf, size, fmt, args);
768 va_end(args);
769
770 return i;
771 }
772
scnprintf(char * buf,size_t size,const char * fmt,...)773 int scnprintf(char *buf, size_t size, const char *fmt, ...)
774 {
775 va_list args;
776 int i;
777
778 va_start(args, fmt);
779 i = vscnprintf(buf, size, fmt, args);
780 va_end(args);
781
782 return i;
783 }
784
785 /**
786 * Format a string and place it in a buffer (va_list version)
787 *
788 * @param buf The buffer to place the result into
789 * @param fmt The format string to use
790 * @param args Arguments for the format string
791 *
792 * The function returns the number of characters written
793 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
794 * buffer overflows.
795 *
796 * If you're not already dealing with a va_list consider using sprintf().
797 */
vsprintf(char * buf,const char * fmt,va_list args)798 int vsprintf(char *buf, const char *fmt, va_list args)
799 {
800 return vsnprintf_internal(buf, INT_MAX, fmt, args);
801 }
802
sprintf(char * buf,const char * fmt,...)803 int sprintf(char *buf, const char *fmt, ...)
804 {
805 va_list args;
806 int i;
807
808 va_start(args, fmt);
809 i = vsprintf(buf, fmt, args);
810 va_end(args);
811 return i;
812 }
813
814 #if CONFIG_IS_ENABLED(PRINTF)
printf(const char * fmt,...)815 int printf(const char *fmt, ...)
816 {
817 va_list args;
818 uint i;
819
820 va_start(args, fmt);
821 i = vprintf(fmt, args);
822 va_end(args);
823
824 return i;
825 }
826
vprintf(const char * fmt,va_list args)827 int vprintf(const char *fmt, va_list args)
828 {
829 uint i;
830 char printbuffer[CONFIG_SYS_PBSIZE];
831
832 /*
833 * For this to work, printbuffer must be larger than
834 * anything we ever want to print.
835 */
836 i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
837
838 /* Handle error */
839 if (i <= 0)
840 return i;
841 /* Print the string */
842 puts(printbuffer);
843 return i;
844 }
845 #endif
846
847 static char local_toa[22];
848
simple_itoa(ulong i)849 char *simple_itoa(ulong i)
850 {
851 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
852 char *p = &local_toa[21];
853
854 *p-- = '\0';
855 do {
856 *p-- = '0' + i % 10;
857 i /= 10;
858 } while (i > 0);
859 return p + 1;
860 }
861
simple_xtoa(ulong num)862 char *simple_xtoa(ulong num)
863 {
864 /* 16 digits plus nul terminator, good for 64-bit or smaller ints */
865 char *p = &local_toa[17];
866
867 *--p = '\0';
868 do {
869 p -= 2;
870 hex_byte_pack(p, num & 0xff);
871 num >>= 8;
872 } while (num > 0);
873
874 return p;
875 }
876
877 /* We don't seem to have %'d in U-Boot */
print_grouped_ull(unsigned long long int_val,int digits)878 void print_grouped_ull(unsigned long long int_val, int digits)
879 {
880 char str[21], *s;
881 int grab = 3;
882
883 digits = (digits + 2) / 3;
884 sprintf(str, "%*llu", digits * 3, int_val);
885 for (s = str; *s; s += grab) {
886 if (s != str)
887 putc(s[-1] != ' ' ? ',' : ' ');
888 printf("%.*s", grab, s);
889 grab = 3;
890 }
891 }
892
str2off(const char * p,loff_t * num)893 bool str2off(const char *p, loff_t *num)
894 {
895 char *endptr;
896
897 *num = simple_strtoull(p, &endptr, 16);
898 return *p != '\0' && *endptr == '\0';
899 }
900
str2long(const char * p,ulong * num)901 bool str2long(const char *p, ulong *num)
902 {
903 char *endptr;
904
905 *num = hextoul(p, &endptr);
906 return *p != '\0' && *endptr == '\0';
907 }
908
strmhz(char * buf,unsigned long hz)909 char *strmhz(char *buf, unsigned long hz)
910 {
911 long l, n;
912 long m;
913
914 n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
915 l = sprintf(buf, "%ld", n);
916
917 hz -= n * 1000000L;
918 m = DIV_ROUND_CLOSEST(hz, 1000L);
919 if (m != 0)
920 sprintf(buf + l, ".%03ld", m);
921
922 return buf;
923 }
924