vsprintf.c 20 KB

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  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. /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
  9. /*
  10. * Wirzenius wrote this portably, Torvalds fucked it up :-)
  11. *
  12. * from hush: simple_itoa() was lifted from boa-0.93.15
  13. */
  14. #include <common.h>
  15. #include <charset.h>
  16. #include <efi_loader.h>
  17. #include <div64.h>
  18. #include <hexdump.h>
  19. #include <stdarg.h>
  20. #include <uuid.h>
  21. #include <vsprintf.h>
  22. #include <linux/ctype.h>
  23. #include <linux/err.h>
  24. #include <linux/types.h>
  25. #include <linux/string.h>
  26. /* we use this so that we can do without the ctype library */
  27. #define is_digit(c) ((c) >= '0' && (c) <= '9')
  28. static int skip_atoi(const char **s)
  29. {
  30. int i = 0;
  31. while (is_digit(**s))
  32. i = i * 10 + *((*s)++) - '0';
  33. return i;
  34. }
  35. /* Decimal conversion is by far the most typical, and is used
  36. * for /proc and /sys data. This directly impacts e.g. top performance
  37. * with many processes running. We optimize it for speed
  38. * using code from
  39. * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
  40. * (with permission from the author, Douglas W. Jones). */
  41. /* Formats correctly any integer in [0,99999].
  42. * Outputs from one to five digits depending on input.
  43. * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
  44. static char *put_dec_trunc(char *buf, unsigned q)
  45. {
  46. unsigned d3, d2, d1, d0;
  47. d1 = (q>>4) & 0xf;
  48. d2 = (q>>8) & 0xf;
  49. d3 = (q>>12);
  50. d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  51. q = (d0 * 0xcd) >> 11;
  52. d0 = d0 - 10*q;
  53. *buf++ = d0 + '0'; /* least significant digit */
  54. d1 = q + 9*d3 + 5*d2 + d1;
  55. if (d1 != 0) {
  56. q = (d1 * 0xcd) >> 11;
  57. d1 = d1 - 10*q;
  58. *buf++ = d1 + '0'; /* next digit */
  59. d2 = q + 2*d2;
  60. if ((d2 != 0) || (d3 != 0)) {
  61. q = (d2 * 0xd) >> 7;
  62. d2 = d2 - 10*q;
  63. *buf++ = d2 + '0'; /* next digit */
  64. d3 = q + 4*d3;
  65. if (d3 != 0) {
  66. q = (d3 * 0xcd) >> 11;
  67. d3 = d3 - 10*q;
  68. *buf++ = d3 + '0'; /* next digit */
  69. if (q != 0)
  70. *buf++ = q + '0'; /* most sign. digit */
  71. }
  72. }
  73. }
  74. return buf;
  75. }
  76. /* Same with if's removed. Always emits five digits */
  77. static char *put_dec_full(char *buf, unsigned q)
  78. {
  79. /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
  80. /* but anyway, gcc produces better code with full-sized ints */
  81. unsigned d3, d2, d1, d0;
  82. d1 = (q>>4) & 0xf;
  83. d2 = (q>>8) & 0xf;
  84. d3 = (q>>12);
  85. /*
  86. * Possible ways to approx. divide by 10
  87. * gcc -O2 replaces multiply with shifts and adds
  88. * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
  89. * (x * 0x67) >> 10: 1100111
  90. * (x * 0x34) >> 9: 110100 - same
  91. * (x * 0x1a) >> 8: 11010 - same
  92. * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
  93. */
  94. d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  95. q = (d0 * 0xcd) >> 11;
  96. d0 = d0 - 10*q;
  97. *buf++ = d0 + '0';
  98. d1 = q + 9*d3 + 5*d2 + d1;
  99. q = (d1 * 0xcd) >> 11;
  100. d1 = d1 - 10*q;
  101. *buf++ = d1 + '0';
  102. d2 = q + 2*d2;
  103. q = (d2 * 0xd) >> 7;
  104. d2 = d2 - 10*q;
  105. *buf++ = d2 + '0';
  106. d3 = q + 4*d3;
  107. q = (d3 * 0xcd) >> 11; /* - shorter code */
  108. /* q = (d3 * 0x67) >> 10; - would also work */
  109. d3 = d3 - 10*q;
  110. *buf++ = d3 + '0';
  111. *buf++ = q + '0';
  112. return buf;
  113. }
  114. /* No inlining helps gcc to use registers better */
  115. static noinline char *put_dec(char *buf, uint64_t num)
  116. {
  117. while (1) {
  118. unsigned rem;
  119. if (num < 100000)
  120. return put_dec_trunc(buf, num);
  121. rem = do_div(num, 100000);
  122. buf = put_dec_full(buf, rem);
  123. }
  124. }
  125. #define ZEROPAD 1 /* pad with zero */
  126. #define SIGN 2 /* unsigned/signed long */
  127. #define PLUS 4 /* show plus */
  128. #define SPACE 8 /* space if plus */
  129. #define LEFT 16 /* left justified */
  130. #define SMALL 32 /* Must be 32 == 0x20 */
  131. #define SPECIAL 64 /* 0x */
  132. /*
  133. * Macro to add a new character to our output string, but only if it will
  134. * fit. The macro moves to the next character position in the output string.
  135. */
  136. #define ADDCH(str, ch) do { \
  137. if ((str) < end) \
  138. *(str) = (ch); \
  139. ++str; \
  140. } while (0)
  141. static char *number(char *buf, char *end, u64 num,
  142. int base, int size, int precision, int type)
  143. {
  144. /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
  145. static const char digits[16] = "0123456789ABCDEF";
  146. char tmp[66];
  147. char sign;
  148. char locase;
  149. int need_pfx = ((type & SPECIAL) && base != 10);
  150. int i;
  151. /* locase = 0 or 0x20. ORing digits or letters with 'locase'
  152. * produces same digits or (maybe lowercased) letters */
  153. locase = (type & SMALL);
  154. if (type & LEFT)
  155. type &= ~ZEROPAD;
  156. sign = 0;
  157. if (type & SIGN) {
  158. if ((s64) num < 0) {
  159. sign = '-';
  160. num = -(s64) num;
  161. size--;
  162. } else if (type & PLUS) {
  163. sign = '+';
  164. size--;
  165. } else if (type & SPACE) {
  166. sign = ' ';
  167. size--;
  168. }
  169. }
  170. if (need_pfx) {
  171. size--;
  172. if (base == 16)
  173. size--;
  174. }
  175. /* generate full string in tmp[], in reverse order */
  176. i = 0;
  177. if (num == 0)
  178. tmp[i++] = '0';
  179. /* Generic code, for any base:
  180. else do {
  181. tmp[i++] = (digits[do_div(num,base)] | locase);
  182. } while (num != 0);
  183. */
  184. else if (base != 10) { /* 8 or 16 */
  185. int mask = base - 1;
  186. int shift = 3;
  187. if (base == 16)
  188. shift = 4;
  189. do {
  190. tmp[i++] = (digits[((unsigned char)num) & mask]
  191. | locase);
  192. num >>= shift;
  193. } while (num);
  194. } else { /* base 10 */
  195. i = put_dec(tmp, num) - tmp;
  196. }
  197. /* printing 100 using %2d gives "100", not "00" */
  198. if (i > precision)
  199. precision = i;
  200. /* leading space padding */
  201. size -= precision;
  202. if (!(type & (ZEROPAD + LEFT))) {
  203. while (--size >= 0)
  204. ADDCH(buf, ' ');
  205. }
  206. /* sign */
  207. if (sign)
  208. ADDCH(buf, sign);
  209. /* "0x" / "0" prefix */
  210. if (need_pfx) {
  211. ADDCH(buf, '0');
  212. if (base == 16)
  213. ADDCH(buf, 'X' | locase);
  214. }
  215. /* zero or space padding */
  216. if (!(type & LEFT)) {
  217. char c = (type & ZEROPAD) ? '0' : ' ';
  218. while (--size >= 0)
  219. ADDCH(buf, c);
  220. }
  221. /* hmm even more zero padding? */
  222. while (i <= --precision)
  223. ADDCH(buf, '0');
  224. /* actual digits of result */
  225. while (--i >= 0)
  226. ADDCH(buf, tmp[i]);
  227. /* trailing space padding */
  228. while (--size >= 0)
  229. ADDCH(buf, ' ');
  230. return buf;
  231. }
  232. static char *string(char *buf, char *end, const char *s, int field_width,
  233. int precision, int flags)
  234. {
  235. int len, i;
  236. if (s == NULL)
  237. s = "<NULL>";
  238. len = strnlen(s, precision);
  239. if (!(flags & LEFT))
  240. while (len < field_width--)
  241. ADDCH(buf, ' ');
  242. for (i = 0; i < len; ++i)
  243. ADDCH(buf, *s++);
  244. while (len < field_width--)
  245. ADDCH(buf, ' ');
  246. return buf;
  247. }
  248. /* U-Boot uses UTF-16 strings in the EFI context only. */
  249. static __maybe_unused char *string16(char *buf, char *end, u16 *s,
  250. int field_width, int precision, int flags)
  251. {
  252. const u16 *str = s ? s : L"<NULL>";
  253. ssize_t i, len = utf16_strnlen(str, precision);
  254. if (!(flags & LEFT))
  255. for (; len < field_width; --field_width)
  256. ADDCH(buf, ' ');
  257. for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
  258. s32 s = utf16_get(&str);
  259. if (s < 0)
  260. s = '?';
  261. utf8_put(s, &buf);
  262. }
  263. for (; len < field_width; --field_width)
  264. ADDCH(buf, ' ');
  265. return buf;
  266. }
  267. #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
  268. static char *device_path_string(char *buf, char *end, void *dp, int field_width,
  269. int precision, int flags)
  270. {
  271. u16 *str;
  272. /* If dp == NULL output the string '<NULL>' */
  273. if (!dp)
  274. return string16(buf, end, dp, field_width, precision, flags);
  275. str = efi_dp_str((struct efi_device_path *)dp);
  276. if (!str)
  277. return ERR_PTR(-ENOMEM);
  278. buf = string16(buf, end, str, field_width, precision, flags);
  279. efi_free_pool(str);
  280. return buf;
  281. }
  282. #endif
  283. static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
  284. int precision, int flags)
  285. {
  286. /* (6 * 2 hex digits), 5 colons and trailing zero */
  287. char mac_addr[6 * 3];
  288. char *p = mac_addr;
  289. int i;
  290. for (i = 0; i < 6; i++) {
  291. p = hex_byte_pack(p, addr[i]);
  292. if (!(flags & SPECIAL) && i != 5)
  293. *p++ = ':';
  294. }
  295. *p = '\0';
  296. return string(buf, end, mac_addr, field_width, precision,
  297. flags & ~SPECIAL);
  298. }
  299. static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
  300. int precision, int flags)
  301. {
  302. /* (8 * 4 hex digits), 7 colons and trailing zero */
  303. char ip6_addr[8 * 5];
  304. char *p = ip6_addr;
  305. int i;
  306. for (i = 0; i < 8; i++) {
  307. p = hex_byte_pack(p, addr[2 * i]);
  308. p = hex_byte_pack(p, addr[2 * i + 1]);
  309. if (!(flags & SPECIAL) && i != 7)
  310. *p++ = ':';
  311. }
  312. *p = '\0';
  313. return string(buf, end, ip6_addr, field_width, precision,
  314. flags & ~SPECIAL);
  315. }
  316. static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
  317. int precision, int flags)
  318. {
  319. /* (4 * 3 decimal digits), 3 dots and trailing zero */
  320. char ip4_addr[4 * 4];
  321. char temp[3]; /* hold each IP quad in reverse order */
  322. char *p = ip4_addr;
  323. int i, digits;
  324. for (i = 0; i < 4; i++) {
  325. digits = put_dec_trunc(temp, addr[i]) - temp;
  326. /* reverse the digits in the quad */
  327. while (digits--)
  328. *p++ = temp[digits];
  329. if (i != 3)
  330. *p++ = '.';
  331. }
  332. *p = '\0';
  333. return string(buf, end, ip4_addr, field_width, precision,
  334. flags & ~SPECIAL);
  335. }
  336. #ifdef CONFIG_LIB_UUID
  337. /*
  338. * This works (roughly) the same way as Linux's.
  339. *
  340. * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
  341. * %pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
  342. * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
  343. * %pUL: 04030201-0605-0807-090A-0B0C0D0E0F10
  344. * %pUs: GUID text representation if known or fallback to %pUl
  345. */
  346. static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
  347. int precision, int flags, const char *fmt)
  348. {
  349. char uuid[UUID_STR_LEN + 1];
  350. int str_format;
  351. const char *str;
  352. switch (*(++fmt)) {
  353. case 'L':
  354. str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
  355. break;
  356. case 'l':
  357. str_format = UUID_STR_FORMAT_GUID;
  358. break;
  359. case 'B':
  360. str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
  361. break;
  362. case 's':
  363. str = uuid_guid_get_str(addr);
  364. if (str)
  365. return string(buf, end, str,
  366. field_width, precision, flags);
  367. str_format = UUID_STR_FORMAT_GUID;
  368. break;
  369. default:
  370. str_format = UUID_STR_FORMAT_STD;
  371. break;
  372. }
  373. if (addr)
  374. uuid_bin_to_str(addr, uuid, str_format);
  375. else
  376. strcpy(uuid, "<NULL>");
  377. return string(buf, end, uuid, field_width, precision, flags);
  378. }
  379. #endif
  380. /*
  381. * Show a '%p' thing. A kernel extension is that the '%p' is followed
  382. * by an extra set of alphanumeric characters that are extended format
  383. * specifiers.
  384. *
  385. * Right now we handle:
  386. *
  387. * - 'M' For a 6-byte MAC address, it prints the address in the
  388. * usual colon-separated hex notation
  389. * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
  390. * decimal for v4 and colon separated network-order 16 bit hex for v6)
  391. * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
  392. * currently the same
  393. *
  394. * Note: IPv6 support is currently if(0)'ed out. If you ever need
  395. * %pI6, please add an IPV6 Kconfig knob, make your code select or
  396. * depend on that, and change the 0 below to CONFIG_IS_ENABLED(IPV6).
  397. */
  398. static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
  399. int field_width, int precision, int flags)
  400. {
  401. u64 num = (uintptr_t)ptr;
  402. /*
  403. * Being a boot loader, we explicitly allow pointers to
  404. * (physical) address null.
  405. */
  406. #if 0
  407. if (!ptr)
  408. return string(buf, end, "(null)", field_width, precision,
  409. flags);
  410. #endif
  411. switch (*fmt) {
  412. /* Device paths only exist in the EFI context. */
  413. #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
  414. case 'D':
  415. return device_path_string(buf, end, ptr, field_width,
  416. precision, flags);
  417. #endif
  418. case 'a':
  419. flags |= SPECIAL | ZEROPAD;
  420. switch (fmt[1]) {
  421. case 'p':
  422. default:
  423. field_width = sizeof(phys_addr_t) * 2 + 2;
  424. num = *(phys_addr_t *)ptr;
  425. break;
  426. }
  427. break;
  428. case 'm':
  429. flags |= SPECIAL;
  430. /* Fallthrough */
  431. case 'M':
  432. return mac_address_string(buf, end, ptr, field_width,
  433. precision, flags);
  434. case 'i':
  435. flags |= SPECIAL;
  436. /* Fallthrough */
  437. case 'I':
  438. /* %pI6 currently unused */
  439. if (0 && fmt[1] == '6')
  440. return ip6_addr_string(buf, end, ptr, field_width,
  441. precision, flags);
  442. if (fmt[1] == '4')
  443. return ip4_addr_string(buf, end, ptr, field_width,
  444. precision, flags);
  445. flags &= ~SPECIAL;
  446. break;
  447. #ifdef CONFIG_LIB_UUID
  448. case 'U':
  449. return uuid_string(buf, end, ptr, field_width, precision,
  450. flags, fmt);
  451. #endif
  452. default:
  453. break;
  454. }
  455. flags |= SMALL;
  456. if (field_width == -1) {
  457. field_width = 2*sizeof(void *);
  458. flags |= ZEROPAD;
  459. }
  460. return number(buf, end, num, 16, field_width, precision, flags);
  461. }
  462. static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
  463. va_list args)
  464. {
  465. u64 num;
  466. int base;
  467. char *str;
  468. int flags; /* flags to number() */
  469. int field_width; /* width of output field */
  470. int precision; /* min. # of digits for integers; max
  471. number of chars for from string */
  472. int qualifier; /* 'h', 'l', or 'L' for integer fields */
  473. /* 'z' support added 23/7/1999 S.H. */
  474. /* 'z' changed to 'Z' --davidm 1/25/99 */
  475. /* 't' added for ptrdiff_t */
  476. char *end = buf + size;
  477. /* Make sure end is always >= buf - do we want this in U-Boot? */
  478. if (end < buf) {
  479. end = ((void *)-1);
  480. size = end - buf;
  481. }
  482. str = buf;
  483. for (; *fmt ; ++fmt) {
  484. if (*fmt != '%') {
  485. ADDCH(str, *fmt);
  486. continue;
  487. }
  488. /* process flags */
  489. flags = 0;
  490. repeat:
  491. ++fmt; /* this also skips first '%' */
  492. switch (*fmt) {
  493. case '-':
  494. flags |= LEFT;
  495. goto repeat;
  496. case '+':
  497. flags |= PLUS;
  498. goto repeat;
  499. case ' ':
  500. flags |= SPACE;
  501. goto repeat;
  502. case '#':
  503. flags |= SPECIAL;
  504. goto repeat;
  505. case '0':
  506. flags |= ZEROPAD;
  507. goto repeat;
  508. }
  509. /* get field width */
  510. field_width = -1;
  511. if (is_digit(*fmt))
  512. field_width = skip_atoi(&fmt);
  513. else if (*fmt == '*') {
  514. ++fmt;
  515. /* it's the next argument */
  516. field_width = va_arg(args, int);
  517. if (field_width < 0) {
  518. field_width = -field_width;
  519. flags |= LEFT;
  520. }
  521. }
  522. /* get the precision */
  523. precision = -1;
  524. if (*fmt == '.') {
  525. ++fmt;
  526. if (is_digit(*fmt))
  527. precision = skip_atoi(&fmt);
  528. else if (*fmt == '*') {
  529. ++fmt;
  530. /* it's the next argument */
  531. precision = va_arg(args, int);
  532. }
  533. if (precision < 0)
  534. precision = 0;
  535. }
  536. /* get the conversion qualifier */
  537. qualifier = -1;
  538. if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
  539. *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
  540. qualifier = *fmt;
  541. ++fmt;
  542. if (qualifier == 'l' && *fmt == 'l') {
  543. qualifier = 'L';
  544. ++fmt;
  545. }
  546. }
  547. /* default base */
  548. base = 10;
  549. switch (*fmt) {
  550. case 'c':
  551. if (!(flags & LEFT)) {
  552. while (--field_width > 0)
  553. ADDCH(str, ' ');
  554. }
  555. ADDCH(str, (unsigned char) va_arg(args, int));
  556. while (--field_width > 0)
  557. ADDCH(str, ' ');
  558. continue;
  559. case 's':
  560. /* U-Boot uses UTF-16 strings in the EFI context only. */
  561. #if (CONFIG_IS_ENABLED(EFI_LOADER) || CONFIG_IS_ENABLED(EFI_APP)) && \
  562. !defined(API_BUILD)
  563. if (qualifier == 'l') {
  564. str = string16(str, end, va_arg(args, u16 *),
  565. field_width, precision, flags);
  566. } else
  567. #endif
  568. {
  569. str = string(str, end, va_arg(args, char *),
  570. field_width, precision, flags);
  571. }
  572. continue;
  573. case 'p':
  574. str = pointer(fmt + 1, str, end,
  575. va_arg(args, void *),
  576. field_width, precision, flags);
  577. if (IS_ERR(str))
  578. return PTR_ERR(str);
  579. /* Skip all alphanumeric pointer suffixes */
  580. while (isalnum(fmt[1]))
  581. fmt++;
  582. continue;
  583. case 'n':
  584. if (qualifier == 'l') {
  585. long *ip = va_arg(args, long *);
  586. *ip = (str - buf);
  587. } else {
  588. int *ip = va_arg(args, int *);
  589. *ip = (str - buf);
  590. }
  591. continue;
  592. case '%':
  593. ADDCH(str, '%');
  594. continue;
  595. /* integer number formats - set up the flags and "break" */
  596. case 'o':
  597. base = 8;
  598. break;
  599. case 'x':
  600. flags |= SMALL;
  601. case 'X':
  602. base = 16;
  603. break;
  604. case 'd':
  605. case 'i':
  606. flags |= SIGN;
  607. case 'u':
  608. break;
  609. default:
  610. ADDCH(str, '%');
  611. if (*fmt)
  612. ADDCH(str, *fmt);
  613. else
  614. --fmt;
  615. continue;
  616. }
  617. if (qualifier == 'L') /* "quad" for 64 bit variables */
  618. num = va_arg(args, unsigned long long);
  619. else if (qualifier == 'l') {
  620. num = va_arg(args, unsigned long);
  621. if (flags & SIGN)
  622. num = (signed long) num;
  623. } else if (qualifier == 'Z' || qualifier == 'z') {
  624. num = va_arg(args, size_t);
  625. } else if (qualifier == 't') {
  626. num = va_arg(args, ptrdiff_t);
  627. } else if (qualifier == 'h') {
  628. num = (unsigned short) va_arg(args, int);
  629. if (flags & SIGN)
  630. num = (signed short) num;
  631. } else {
  632. num = va_arg(args, unsigned int);
  633. if (flags & SIGN)
  634. num = (signed int) num;
  635. }
  636. str = number(str, end, num, base, field_width, precision,
  637. flags);
  638. }
  639. if (size > 0) {
  640. ADDCH(str, '\0');
  641. if (str > end)
  642. end[-1] = '\0';
  643. --str;
  644. }
  645. /* the trailing null byte doesn't count towards the total */
  646. return str - buf;
  647. }
  648. int vsnprintf(char *buf, size_t size, const char *fmt,
  649. va_list args)
  650. {
  651. return vsnprintf_internal(buf, size, fmt, args);
  652. }
  653. int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
  654. {
  655. int i;
  656. i = vsnprintf(buf, size, fmt, args);
  657. if (likely(i < size))
  658. return i;
  659. if (size != 0)
  660. return size - 1;
  661. return 0;
  662. }
  663. int snprintf(char *buf, size_t size, const char *fmt, ...)
  664. {
  665. va_list args;
  666. int i;
  667. va_start(args, fmt);
  668. i = vsnprintf(buf, size, fmt, args);
  669. va_end(args);
  670. return i;
  671. }
  672. int scnprintf(char *buf, size_t size, const char *fmt, ...)
  673. {
  674. va_list args;
  675. int i;
  676. va_start(args, fmt);
  677. i = vscnprintf(buf, size, fmt, args);
  678. va_end(args);
  679. return i;
  680. }
  681. /**
  682. * Format a string and place it in a buffer (va_list version)
  683. *
  684. * @param buf The buffer to place the result into
  685. * @param fmt The format string to use
  686. * @param args Arguments for the format string
  687. *
  688. * The function returns the number of characters written
  689. * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
  690. * buffer overflows.
  691. *
  692. * If you're not already dealing with a va_list consider using sprintf().
  693. */
  694. int vsprintf(char *buf, const char *fmt, va_list args)
  695. {
  696. return vsnprintf_internal(buf, INT_MAX, fmt, args);
  697. }
  698. int sprintf(char *buf, const char *fmt, ...)
  699. {
  700. va_list args;
  701. int i;
  702. va_start(args, fmt);
  703. i = vsprintf(buf, fmt, args);
  704. va_end(args);
  705. return i;
  706. }
  707. #if CONFIG_IS_ENABLED(PRINTF)
  708. int printf(const char *fmt, ...)
  709. {
  710. va_list args;
  711. uint i;
  712. va_start(args, fmt);
  713. i = vprintf(fmt, args);
  714. va_end(args);
  715. return i;
  716. }
  717. int vprintf(const char *fmt, va_list args)
  718. {
  719. uint i;
  720. char printbuffer[CONFIG_SYS_PBSIZE];
  721. /*
  722. * For this to work, printbuffer must be larger than
  723. * anything we ever want to print.
  724. */
  725. i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
  726. /* Handle error */
  727. if (i <= 0)
  728. return i;
  729. /* Print the string */
  730. puts(printbuffer);
  731. return i;
  732. }
  733. #endif
  734. static char local_toa[22];
  735. char *simple_itoa(ulong i)
  736. {
  737. /* 21 digits plus null terminator, good for 64-bit or smaller ints */
  738. char *p = &local_toa[21];
  739. *p-- = '\0';
  740. do {
  741. *p-- = '0' + i % 10;
  742. i /= 10;
  743. } while (i > 0);
  744. return p + 1;
  745. }
  746. char *simple_xtoa(ulong num)
  747. {
  748. /* 16 digits plus nul terminator, good for 64-bit or smaller ints */
  749. char *p = &local_toa[17];
  750. *--p = '\0';
  751. do {
  752. p -= 2;
  753. hex_byte_pack(p, num & 0xff);
  754. num >>= 8;
  755. } while (num > 0);
  756. return p;
  757. }
  758. /* We don't seem to have %'d in U-Boot */
  759. void print_grouped_ull(unsigned long long int_val, int digits)
  760. {
  761. char str[21], *s;
  762. int grab = 3;
  763. digits = (digits + 2) / 3;
  764. sprintf(str, "%*llu", digits * 3, int_val);
  765. for (s = str; *s; s += grab) {
  766. if (s != str)
  767. putc(s[-1] != ' ' ? ',' : ' ');
  768. printf("%.*s", grab, s);
  769. grab = 3;
  770. }
  771. }
  772. bool str2off(const char *p, loff_t *num)
  773. {
  774. char *endptr;
  775. *num = simple_strtoull(p, &endptr, 16);
  776. return *p != '\0' && *endptr == '\0';
  777. }
  778. bool str2long(const char *p, ulong *num)
  779. {
  780. char *endptr;
  781. *num = hextoul(p, &endptr);
  782. return *p != '\0' && *endptr == '\0';
  783. }
  784. char *strmhz(char *buf, unsigned long hz)
  785. {
  786. long l, n;
  787. long m;
  788. n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
  789. l = sprintf(buf, "%ld", n);
  790. hz -= n * 1000000L;
  791. m = DIV_ROUND_CLOSEST(hz, 1000L);
  792. if (m != 0)
  793. sprintf(buf + l, ".%03ld", m);
  794. return buf;
  795. }