vsprintf.c 19 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 <vsprintf.h>
  21. #include <linux/ctype.h>
  22. #include <linux/err.h>
  23. #include <linux/types.h>
  24. #include <linux/string.h>
  25. #define noinline __attribute__((noinline))
  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, 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. #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
  250. static char *string16(char *buf, char *end, u16 *s, int field_width,
  251. int precision, int flags)
  252. {
  253. const u16 *str = s ? s : L"<NULL>";
  254. ssize_t i, len = utf16_strnlen(str, precision);
  255. if (!(flags & LEFT))
  256. for (; len < field_width; --field_width)
  257. ADDCH(buf, ' ');
  258. for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
  259. s32 s = utf16_get(&str);
  260. if (s < 0)
  261. s = '?';
  262. utf8_put(s, &buf);
  263. }
  264. for (; len < field_width; --field_width)
  265. ADDCH(buf, ' ');
  266. return buf;
  267. }
  268. #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
  269. static char *device_path_string(char *buf, char *end, void *dp, int field_width,
  270. int precision, int flags)
  271. {
  272. u16 *str;
  273. /* If dp == NULL output the string '<NULL>' */
  274. if (!dp)
  275. return string16(buf, end, dp, field_width, precision, flags);
  276. str = efi_dp_str((struct efi_device_path *)dp);
  277. if (!str)
  278. return ERR_PTR(-ENOMEM);
  279. buf = string16(buf, end, str, field_width, precision, flags);
  280. efi_free_pool(str);
  281. return buf;
  282. }
  283. #endif
  284. #endif
  285. static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
  286. int precision, int flags)
  287. {
  288. /* (6 * 2 hex digits), 5 colons and trailing zero */
  289. char mac_addr[6 * 3];
  290. char *p = mac_addr;
  291. int i;
  292. for (i = 0; i < 6; i++) {
  293. p = hex_byte_pack(p, addr[i]);
  294. if (!(flags & SPECIAL) && i != 5)
  295. *p++ = ':';
  296. }
  297. *p = '\0';
  298. return string(buf, end, mac_addr, field_width, precision,
  299. flags & ~SPECIAL);
  300. }
  301. static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
  302. int precision, int flags)
  303. {
  304. /* (8 * 4 hex digits), 7 colons and trailing zero */
  305. char ip6_addr[8 * 5];
  306. char *p = ip6_addr;
  307. int i;
  308. for (i = 0; i < 8; i++) {
  309. p = hex_byte_pack(p, addr[2 * i]);
  310. p = hex_byte_pack(p, addr[2 * i + 1]);
  311. if (!(flags & SPECIAL) && i != 7)
  312. *p++ = ':';
  313. }
  314. *p = '\0';
  315. return string(buf, end, ip6_addr, field_width, precision,
  316. flags & ~SPECIAL);
  317. }
  318. static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
  319. int precision, int flags)
  320. {
  321. /* (4 * 3 decimal digits), 3 dots and trailing zero */
  322. char ip4_addr[4 * 4];
  323. char temp[3]; /* hold each IP quad in reverse order */
  324. char *p = ip4_addr;
  325. int i, digits;
  326. for (i = 0; i < 4; i++) {
  327. digits = put_dec_trunc(temp, addr[i]) - temp;
  328. /* reverse the digits in the quad */
  329. while (digits--)
  330. *p++ = temp[digits];
  331. if (i != 3)
  332. *p++ = '.';
  333. }
  334. *p = '\0';
  335. return string(buf, end, ip4_addr, field_width, precision,
  336. flags & ~SPECIAL);
  337. }
  338. #ifdef CONFIG_LIB_UUID
  339. /*
  340. * This works (roughly) the same way as Linux's.
  341. *
  342. * %pUb: 01020304-0506-0708-090a-0b0c0d0e0f10
  343. * %pUB: 01020304-0506-0708-090A-0B0C0D0E0F10
  344. * %pUl: 04030201-0605-0807-090a-0b0c0d0e0f10
  345. * %pUL: 04030201-0605-0807-090A-0B0C0D0E0F10
  346. */
  347. static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
  348. int precision, int flags, const char *fmt)
  349. {
  350. char uuid[UUID_STR_LEN + 1];
  351. int str_format;
  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. default:
  363. str_format = UUID_STR_FORMAT_STD;
  364. break;
  365. }
  366. if (addr)
  367. uuid_bin_to_str(addr, uuid, str_format);
  368. else
  369. strcpy(uuid, "<NULL>");
  370. return string(buf, end, uuid, field_width, precision, flags);
  371. }
  372. #endif
  373. /*
  374. * Show a '%p' thing. A kernel extension is that the '%p' is followed
  375. * by an extra set of alphanumeric characters that are extended format
  376. * specifiers.
  377. *
  378. * Right now we handle:
  379. *
  380. * - 'M' For a 6-byte MAC address, it prints the address in the
  381. * usual colon-separated hex notation
  382. * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
  383. * decimal for v4 and colon separated network-order 16 bit hex for v6)
  384. * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
  385. * currently the same
  386. *
  387. * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  388. * function pointers are really function descriptors, which contain a
  389. * pointer to the real address.
  390. */
  391. static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
  392. int field_width, int precision, int flags)
  393. {
  394. u64 num = (uintptr_t)ptr;
  395. /*
  396. * Being a boot loader, we explicitly allow pointers to
  397. * (physical) address null.
  398. */
  399. #if 0
  400. if (!ptr)
  401. return string(buf, end, "(null)", field_width, precision,
  402. flags);
  403. #endif
  404. switch (*fmt) {
  405. /* Device paths only exist in the EFI context. */
  406. #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
  407. case 'D':
  408. return device_path_string(buf, end, ptr, field_width,
  409. precision, flags);
  410. #endif
  411. case 'a':
  412. flags |= SPECIAL | ZEROPAD;
  413. switch (fmt[1]) {
  414. case 'p':
  415. default:
  416. field_width = sizeof(phys_addr_t) * 2 + 2;
  417. num = *(phys_addr_t *)ptr;
  418. break;
  419. }
  420. break;
  421. case 'm':
  422. flags |= SPECIAL;
  423. /* Fallthrough */
  424. case 'M':
  425. return mac_address_string(buf, end, ptr, field_width,
  426. precision, flags);
  427. case 'i':
  428. flags |= SPECIAL;
  429. /* Fallthrough */
  430. case 'I':
  431. if (fmt[1] == '6')
  432. return ip6_addr_string(buf, end, ptr, field_width,
  433. precision, flags);
  434. if (fmt[1] == '4')
  435. return ip4_addr_string(buf, end, ptr, field_width,
  436. precision, flags);
  437. flags &= ~SPECIAL;
  438. break;
  439. #ifdef CONFIG_LIB_UUID
  440. case 'U':
  441. return uuid_string(buf, end, ptr, field_width, precision,
  442. flags, fmt);
  443. #endif
  444. default:
  445. break;
  446. }
  447. flags |= SMALL;
  448. if (field_width == -1) {
  449. field_width = 2*sizeof(void *);
  450. flags |= ZEROPAD;
  451. }
  452. return number(buf, end, num, 16, field_width, precision, flags);
  453. }
  454. static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
  455. va_list args)
  456. {
  457. u64 num;
  458. int base;
  459. char *str;
  460. int flags; /* flags to number() */
  461. int field_width; /* width of output field */
  462. int precision; /* min. # of digits for integers; max
  463. number of chars for from string */
  464. int qualifier; /* 'h', 'l', or 'L' for integer fields */
  465. /* 'z' support added 23/7/1999 S.H. */
  466. /* 'z' changed to 'Z' --davidm 1/25/99 */
  467. /* 't' added for ptrdiff_t */
  468. char *end = buf + size;
  469. /* Make sure end is always >= buf - do we want this in U-Boot? */
  470. if (end < buf) {
  471. end = ((void *)-1);
  472. size = end - buf;
  473. }
  474. str = buf;
  475. for (; *fmt ; ++fmt) {
  476. if (*fmt != '%') {
  477. ADDCH(str, *fmt);
  478. continue;
  479. }
  480. /* process flags */
  481. flags = 0;
  482. repeat:
  483. ++fmt; /* this also skips first '%' */
  484. switch (*fmt) {
  485. case '-':
  486. flags |= LEFT;
  487. goto repeat;
  488. case '+':
  489. flags |= PLUS;
  490. goto repeat;
  491. case ' ':
  492. flags |= SPACE;
  493. goto repeat;
  494. case '#':
  495. flags |= SPECIAL;
  496. goto repeat;
  497. case '0':
  498. flags |= ZEROPAD;
  499. goto repeat;
  500. }
  501. /* get field width */
  502. field_width = -1;
  503. if (is_digit(*fmt))
  504. field_width = skip_atoi(&fmt);
  505. else if (*fmt == '*') {
  506. ++fmt;
  507. /* it's the next argument */
  508. field_width = va_arg(args, int);
  509. if (field_width < 0) {
  510. field_width = -field_width;
  511. flags |= LEFT;
  512. }
  513. }
  514. /* get the precision */
  515. precision = -1;
  516. if (*fmt == '.') {
  517. ++fmt;
  518. if (is_digit(*fmt))
  519. precision = skip_atoi(&fmt);
  520. else if (*fmt == '*') {
  521. ++fmt;
  522. /* it's the next argument */
  523. precision = va_arg(args, int);
  524. }
  525. if (precision < 0)
  526. precision = 0;
  527. }
  528. /* get the conversion qualifier */
  529. qualifier = -1;
  530. if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
  531. *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
  532. qualifier = *fmt;
  533. ++fmt;
  534. if (qualifier == 'l' && *fmt == 'l') {
  535. qualifier = 'L';
  536. ++fmt;
  537. }
  538. }
  539. /* default base */
  540. base = 10;
  541. switch (*fmt) {
  542. case 'c':
  543. if (!(flags & LEFT)) {
  544. while (--field_width > 0)
  545. ADDCH(str, ' ');
  546. }
  547. ADDCH(str, (unsigned char) va_arg(args, int));
  548. while (--field_width > 0)
  549. ADDCH(str, ' ');
  550. continue;
  551. case 's':
  552. /* U-Boot uses UTF-16 strings in the EFI context only. */
  553. #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
  554. if (qualifier == 'l') {
  555. str = string16(str, end, va_arg(args, u16 *),
  556. field_width, precision, flags);
  557. } else
  558. #endif
  559. {
  560. str = string(str, end, va_arg(args, char *),
  561. field_width, precision, flags);
  562. }
  563. continue;
  564. case 'p':
  565. str = pointer(fmt + 1, str, end,
  566. va_arg(args, void *),
  567. field_width, precision, flags);
  568. if (IS_ERR(str))
  569. return PTR_ERR(str);
  570. /* Skip all alphanumeric pointer suffixes */
  571. while (isalnum(fmt[1]))
  572. fmt++;
  573. continue;
  574. case 'n':
  575. if (qualifier == 'l') {
  576. long *ip = va_arg(args, long *);
  577. *ip = (str - buf);
  578. } else {
  579. int *ip = va_arg(args, int *);
  580. *ip = (str - buf);
  581. }
  582. continue;
  583. case '%':
  584. ADDCH(str, '%');
  585. continue;
  586. /* integer number formats - set up the flags and "break" */
  587. case 'o':
  588. base = 8;
  589. break;
  590. case 'x':
  591. flags |= SMALL;
  592. case 'X':
  593. base = 16;
  594. break;
  595. case 'd':
  596. case 'i':
  597. flags |= SIGN;
  598. case 'u':
  599. break;
  600. default:
  601. ADDCH(str, '%');
  602. if (*fmt)
  603. ADDCH(str, *fmt);
  604. else
  605. --fmt;
  606. continue;
  607. }
  608. if (qualifier == 'L') /* "quad" for 64 bit variables */
  609. num = va_arg(args, unsigned long long);
  610. else if (qualifier == 'l') {
  611. num = va_arg(args, unsigned long);
  612. if (flags & SIGN)
  613. num = (signed long) num;
  614. } else if (qualifier == 'Z' || qualifier == 'z') {
  615. num = va_arg(args, size_t);
  616. } else if (qualifier == 't') {
  617. num = va_arg(args, ptrdiff_t);
  618. } else if (qualifier == 'h') {
  619. num = (unsigned short) va_arg(args, int);
  620. if (flags & SIGN)
  621. num = (signed short) num;
  622. } else {
  623. num = va_arg(args, unsigned int);
  624. if (flags & SIGN)
  625. num = (signed int) num;
  626. }
  627. str = number(str, end, num, base, field_width, precision,
  628. flags);
  629. }
  630. if (size > 0) {
  631. ADDCH(str, '\0');
  632. if (str > end)
  633. end[-1] = '\0';
  634. --str;
  635. }
  636. /* the trailing null byte doesn't count towards the total */
  637. return str - buf;
  638. }
  639. int vsnprintf(char *buf, size_t size, const char *fmt,
  640. va_list args)
  641. {
  642. return vsnprintf_internal(buf, size, fmt, args);
  643. }
  644. int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
  645. {
  646. int i;
  647. i = vsnprintf(buf, size, fmt, args);
  648. if (likely(i < size))
  649. return i;
  650. if (size != 0)
  651. return size - 1;
  652. return 0;
  653. }
  654. int snprintf(char *buf, size_t size, const char *fmt, ...)
  655. {
  656. va_list args;
  657. int i;
  658. va_start(args, fmt);
  659. i = vsnprintf(buf, size, fmt, args);
  660. va_end(args);
  661. return i;
  662. }
  663. int scnprintf(char *buf, size_t size, const char *fmt, ...)
  664. {
  665. va_list args;
  666. int i;
  667. va_start(args, fmt);
  668. i = vscnprintf(buf, size, fmt, args);
  669. va_end(args);
  670. return i;
  671. }
  672. /**
  673. * Format a string and place it in a buffer (va_list version)
  674. *
  675. * @param buf The buffer to place the result into
  676. * @param fmt The format string to use
  677. * @param args Arguments for the format string
  678. *
  679. * The function returns the number of characters written
  680. * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
  681. * buffer overflows.
  682. *
  683. * If you're not already dealing with a va_list consider using sprintf().
  684. */
  685. int vsprintf(char *buf, const char *fmt, va_list args)
  686. {
  687. return vsnprintf_internal(buf, INT_MAX, fmt, args);
  688. }
  689. int sprintf(char *buf, const char *fmt, ...)
  690. {
  691. va_list args;
  692. int i;
  693. va_start(args, fmt);
  694. i = vsprintf(buf, fmt, args);
  695. va_end(args);
  696. return i;
  697. }
  698. #if CONFIG_IS_ENABLED(PRINTF)
  699. int printf(const char *fmt, ...)
  700. {
  701. va_list args;
  702. uint i;
  703. char printbuffer[CONFIG_SYS_PBSIZE];
  704. va_start(args, fmt);
  705. /*
  706. * For this to work, printbuffer must be larger than
  707. * anything we ever want to print.
  708. */
  709. i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
  710. va_end(args);
  711. /* Handle error */
  712. if (i <= 0)
  713. return i;
  714. /* Print the string */
  715. puts(printbuffer);
  716. return i;
  717. }
  718. int vprintf(const char *fmt, va_list args)
  719. {
  720. uint i;
  721. char printbuffer[CONFIG_SYS_PBSIZE];
  722. /*
  723. * For this to work, printbuffer must be larger than
  724. * anything we ever want to print.
  725. */
  726. i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
  727. /* Handle error */
  728. if (i <= 0)
  729. return i;
  730. /* Print the string */
  731. puts(printbuffer);
  732. return i;
  733. }
  734. #endif
  735. char *simple_itoa(ulong i)
  736. {
  737. /* 21 digits plus null terminator, good for 64-bit or smaller ints */
  738. static char local[22];
  739. char *p = &local[21];
  740. *p-- = '\0';
  741. do {
  742. *p-- = '0' + i % 10;
  743. i /= 10;
  744. } while (i > 0);
  745. return p + 1;
  746. }
  747. /* We don't seem to have %'d in U-Boot */
  748. void print_grouped_ull(unsigned long long int_val, int digits)
  749. {
  750. char str[21], *s;
  751. int grab = 3;
  752. digits = (digits + 2) / 3;
  753. sprintf(str, "%*llu", digits * 3, int_val);
  754. for (s = str; *s; s += grab) {
  755. if (s != str)
  756. putc(s[-1] != ' ' ? ',' : ' ');
  757. printf("%.*s", grab, s);
  758. grab = 3;
  759. }
  760. }
  761. bool str2off(const char *p, loff_t *num)
  762. {
  763. char *endptr;
  764. *num = simple_strtoull(p, &endptr, 16);
  765. return *p != '\0' && *endptr == '\0';
  766. }
  767. bool str2long(const char *p, ulong *num)
  768. {
  769. char *endptr;
  770. *num = simple_strtoul(p, &endptr, 16);
  771. return *p != '\0' && *endptr == '\0';
  772. }
  773. char *strmhz(char *buf, unsigned long hz)
  774. {
  775. long l, n;
  776. long m;
  777. n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
  778. l = sprintf(buf, "%ld", n);
  779. hz -= n * 1000000L;
  780. m = DIV_ROUND_CLOSEST(hz, 1000L);
  781. if (m != 0)
  782. sprintf(buf + l, ".%03ld", m);
  783. return buf;
  784. }