1 /* 2 * linux/lib/vsprintf.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 */ 6 7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */ 8 /* 9 * Wirzenius wrote this portably, Torvalds fucked it up :-) 10 */ 11 12 #include <stdarg.h> 13 #include <linux/types.h> 14 #include <linux/string.h> 15 #include <linux/ctype.h> 16 #include <errno.h> 17 18 #include <common.h> 19 #if !defined (CONFIG_PANIC_HANG) 20 #include <command.h> 21 #endif 22 23 #include <div64.h> 24 # define NUM_TYPE long long 25 #define noinline __attribute__((noinline)) 26 27 const char hex_asc[] = "0123456789abcdef"; 28 #define hex_asc_lo(x) hex_asc[((x) & 0x0f)] 29 #define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] 30 31 static inline char *pack_hex_byte(char *buf, u8 byte) 32 { 33 *buf++ = hex_asc_hi(byte); 34 *buf++ = hex_asc_lo(byte); 35 return buf; 36 } 37 38 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base) 39 { 40 unsigned long result = 0,value; 41 42 if (*cp == '0') { 43 cp++; 44 if ((*cp == 'x') && isxdigit(cp[1])) { 45 base = 16; 46 cp++; 47 } 48 if (!base) { 49 base = 8; 50 } 51 } 52 if (!base) { 53 base = 10; 54 } 55 while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp) 56 ? toupper(*cp) : *cp)-'A'+10) < base) { 57 result = result*base + value; 58 cp++; 59 } 60 if (endp) 61 *endp = (char *)cp; 62 return result; 63 } 64 65 /** 66 * strict_strtoul - convert a string to an unsigned long strictly 67 * @cp: The string to be converted 68 * @base: The number base to use 69 * @res: The converted result value 70 * 71 * strict_strtoul converts a string to an unsigned long only if the 72 * string is really an unsigned long string, any string containing 73 * any invalid char at the tail will be rejected and -EINVAL is returned, 74 * only a newline char at the tail is acceptible because people generally 75 * change a module parameter in the following way: 76 * 77 * echo 1024 > /sys/module/e1000/parameters/copybreak 78 * 79 * echo will append a newline to the tail. 80 * 81 * It returns 0 if conversion is successful and *res is set to the converted 82 * value, otherwise it returns -EINVAL and *res is set to 0. 83 * 84 * simple_strtoul just ignores the successive invalid characters and 85 * return the converted value of prefix part of the string. 86 * 87 * Copied this function from Linux 2.6.38 commit ID: 88 * 521cb40b0c44418a4fd36dc633f575813d59a43d 89 * 90 */ 91 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res) 92 { 93 char *tail; 94 unsigned long val; 95 size_t len; 96 97 *res = 0; 98 len = strlen(cp); 99 if (len == 0) 100 return -EINVAL; 101 102 val = simple_strtoul(cp, &tail, base); 103 if (tail == cp) 104 return -EINVAL; 105 106 if ((*tail == '\0') || 107 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) { 108 *res = val; 109 return 0; 110 } 111 112 return -EINVAL; 113 } 114 115 long simple_strtol(const char *cp,char **endp,unsigned int base) 116 { 117 if(*cp=='-') 118 return -simple_strtoul(cp+1,endp,base); 119 return simple_strtoul(cp,endp,base); 120 } 121 122 int ustrtoul(const char *cp, char **endp, unsigned int base) 123 { 124 unsigned long result = simple_strtoul(cp, endp, base); 125 switch (**endp) { 126 case 'G' : 127 result *= 1024; 128 /* fall through */ 129 case 'M': 130 result *= 1024; 131 /* fall through */ 132 case 'K': 133 case 'k': 134 result *= 1024; 135 if ((*endp)[1] == 'i') { 136 if ((*endp)[2] == 'B') 137 (*endp) += 3; 138 else 139 (*endp) += 2; 140 } 141 } 142 return result; 143 } 144 145 unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base) 146 { 147 unsigned long long result = 0, value; 148 149 if (*cp == '0') { 150 cp++; 151 if ((*cp == 'x') && isxdigit (cp[1])) { 152 base = 16; 153 cp++; 154 } 155 if (!base) { 156 base = 8; 157 } 158 } 159 if (!base) { 160 base = 10; 161 } 162 while (isxdigit (*cp) && (value = isdigit (*cp) 163 ? *cp - '0' 164 : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) { 165 result = result * base + value; 166 cp++; 167 } 168 if (endp) 169 *endp = (char *) cp; 170 return result; 171 } 172 173 /* we use this so that we can do without the ctype library */ 174 #define is_digit(c) ((c) >= '0' && (c) <= '9') 175 176 static int skip_atoi(const char **s) 177 { 178 int i=0; 179 180 while (is_digit(**s)) 181 i = i*10 + *((*s)++) - '0'; 182 return i; 183 } 184 185 /* Decimal conversion is by far the most typical, and is used 186 * for /proc and /sys data. This directly impacts e.g. top performance 187 * with many processes running. We optimize it for speed 188 * using code from 189 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html 190 * (with permission from the author, Douglas W. Jones). */ 191 192 /* Formats correctly any integer in [0,99999]. 193 * Outputs from one to five digits depending on input. 194 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ 195 static char* put_dec_trunc(char *buf, unsigned q) 196 { 197 unsigned d3, d2, d1, d0; 198 d1 = (q>>4) & 0xf; 199 d2 = (q>>8) & 0xf; 200 d3 = (q>>12); 201 202 d0 = 6*(d3 + d2 + d1) + (q & 0xf); 203 q = (d0 * 0xcd) >> 11; 204 d0 = d0 - 10*q; 205 *buf++ = d0 + '0'; /* least significant digit */ 206 d1 = q + 9*d3 + 5*d2 + d1; 207 if (d1 != 0) { 208 q = (d1 * 0xcd) >> 11; 209 d1 = d1 - 10*q; 210 *buf++ = d1 + '0'; /* next digit */ 211 212 d2 = q + 2*d2; 213 if ((d2 != 0) || (d3 != 0)) { 214 q = (d2 * 0xd) >> 7; 215 d2 = d2 - 10*q; 216 *buf++ = d2 + '0'; /* next digit */ 217 218 d3 = q + 4*d3; 219 if (d3 != 0) { 220 q = (d3 * 0xcd) >> 11; 221 d3 = d3 - 10*q; 222 *buf++ = d3 + '0'; /* next digit */ 223 if (q != 0) 224 *buf++ = q + '0'; /* most sign. digit */ 225 } 226 } 227 } 228 return buf; 229 } 230 /* Same with if's removed. Always emits five digits */ 231 static char* put_dec_full(char *buf, unsigned q) 232 { 233 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ 234 /* but anyway, gcc produces better code with full-sized ints */ 235 unsigned d3, d2, d1, d0; 236 d1 = (q>>4) & 0xf; 237 d2 = (q>>8) & 0xf; 238 d3 = (q>>12); 239 240 /* 241 * Possible ways to approx. divide by 10 242 * gcc -O2 replaces multiply with shifts and adds 243 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) 244 * (x * 0x67) >> 10: 1100111 245 * (x * 0x34) >> 9: 110100 - same 246 * (x * 0x1a) >> 8: 11010 - same 247 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) 248 */ 249 250 d0 = 6*(d3 + d2 + d1) + (q & 0xf); 251 q = (d0 * 0xcd) >> 11; 252 d0 = d0 - 10*q; 253 *buf++ = d0 + '0'; 254 d1 = q + 9*d3 + 5*d2 + d1; 255 q = (d1 * 0xcd) >> 11; 256 d1 = d1 - 10*q; 257 *buf++ = d1 + '0'; 258 259 d2 = q + 2*d2; 260 q = (d2 * 0xd) >> 7; 261 d2 = d2 - 10*q; 262 *buf++ = d2 + '0'; 263 264 d3 = q + 4*d3; 265 q = (d3 * 0xcd) >> 11; /* - shorter code */ 266 /* q = (d3 * 0x67) >> 10; - would also work */ 267 d3 = d3 - 10*q; 268 *buf++ = d3 + '0'; 269 *buf++ = q + '0'; 270 return buf; 271 } 272 /* No inlining helps gcc to use registers better */ 273 static noinline char* put_dec(char *buf, unsigned NUM_TYPE num) 274 { 275 while (1) { 276 unsigned rem; 277 if (num < 100000) 278 return put_dec_trunc(buf, num); 279 rem = do_div(num, 100000); 280 buf = put_dec_full(buf, rem); 281 } 282 } 283 284 #define ZEROPAD 1 /* pad with zero */ 285 #define SIGN 2 /* unsigned/signed long */ 286 #define PLUS 4 /* show plus */ 287 #define SPACE 8 /* space if plus */ 288 #define LEFT 16 /* left justified */ 289 #define SMALL 32 /* Must be 32 == 0x20 */ 290 #define SPECIAL 64 /* 0x */ 291 292 static char *number(char *buf, unsigned NUM_TYPE num, int base, int size, int precision, int type) 293 { 294 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ 295 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ 296 297 char tmp[66]; 298 char sign; 299 char locase; 300 int need_pfx = ((type & SPECIAL) && base != 10); 301 int i; 302 303 /* locase = 0 or 0x20. ORing digits or letters with 'locase' 304 * produces same digits or (maybe lowercased) letters */ 305 locase = (type & SMALL); 306 if (type & LEFT) 307 type &= ~ZEROPAD; 308 sign = 0; 309 if (type & SIGN) { 310 if ((signed NUM_TYPE) num < 0) { 311 sign = '-'; 312 num = - (signed NUM_TYPE) num; 313 size--; 314 } else if (type & PLUS) { 315 sign = '+'; 316 size--; 317 } else if (type & SPACE) { 318 sign = ' '; 319 size--; 320 } 321 } 322 if (need_pfx) { 323 size--; 324 if (base == 16) 325 size--; 326 } 327 328 /* generate full string in tmp[], in reverse order */ 329 i = 0; 330 if (num == 0) 331 tmp[i++] = '0'; 332 /* Generic code, for any base: 333 else do { 334 tmp[i++] = (digits[do_div(num,base)] | locase); 335 } while (num != 0); 336 */ 337 else if (base != 10) { /* 8 or 16 */ 338 int mask = base - 1; 339 int shift = 3; 340 if (base == 16) shift = 4; 341 do { 342 tmp[i++] = (digits[((unsigned char)num) & mask] | locase); 343 num >>= shift; 344 } while (num); 345 } else { /* base 10 */ 346 i = put_dec(tmp, num) - tmp; 347 } 348 349 /* printing 100 using %2d gives "100", not "00" */ 350 if (i > precision) 351 precision = i; 352 /* leading space padding */ 353 size -= precision; 354 if (!(type & (ZEROPAD+LEFT))) 355 while(--size >= 0) 356 *buf++ = ' '; 357 /* sign */ 358 if (sign) 359 *buf++ = sign; 360 /* "0x" / "0" prefix */ 361 if (need_pfx) { 362 *buf++ = '0'; 363 if (base == 16) 364 *buf++ = ('X' | locase); 365 } 366 /* zero or space padding */ 367 if (!(type & LEFT)) { 368 char c = (type & ZEROPAD) ? '0' : ' '; 369 while (--size >= 0) 370 *buf++ = c; 371 } 372 /* hmm even more zero padding? */ 373 while (i <= --precision) 374 *buf++ = '0'; 375 /* actual digits of result */ 376 while (--i >= 0) 377 *buf++ = tmp[i]; 378 /* trailing space padding */ 379 while (--size >= 0) 380 *buf++ = ' '; 381 return buf; 382 } 383 384 static char *string(char *buf, char *s, int field_width, int precision, int flags) 385 { 386 int len, i; 387 388 if (s == 0) 389 s = "<NULL>"; 390 391 len = strnlen(s, precision); 392 393 if (!(flags & LEFT)) 394 while (len < field_width--) 395 *buf++ = ' '; 396 for (i = 0; i < len; ++i) 397 *buf++ = *s++; 398 while (len < field_width--) 399 *buf++ = ' '; 400 return buf; 401 } 402 403 #ifdef CONFIG_CMD_NET 404 static char *mac_address_string(char *buf, u8 *addr, int field_width, 405 int precision, int flags) 406 { 407 char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */ 408 char *p = mac_addr; 409 int i; 410 411 for (i = 0; i < 6; i++) { 412 p = pack_hex_byte(p, addr[i]); 413 if (!(flags & SPECIAL) && i != 5) 414 *p++ = ':'; 415 } 416 *p = '\0'; 417 418 return string(buf, mac_addr, field_width, precision, flags & ~SPECIAL); 419 } 420 421 static char *ip6_addr_string(char *buf, u8 *addr, int field_width, 422 int precision, int flags) 423 { 424 char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */ 425 char *p = ip6_addr; 426 int i; 427 428 for (i = 0; i < 8; i++) { 429 p = pack_hex_byte(p, addr[2 * i]); 430 p = pack_hex_byte(p, addr[2 * i + 1]); 431 if (!(flags & SPECIAL) && i != 7) 432 *p++ = ':'; 433 } 434 *p = '\0'; 435 436 return string(buf, ip6_addr, field_width, precision, flags & ~SPECIAL); 437 } 438 439 static char *ip4_addr_string(char *buf, u8 *addr, int field_width, 440 int precision, int flags) 441 { 442 char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */ 443 char temp[3]; /* hold each IP quad in reverse order */ 444 char *p = ip4_addr; 445 int i, digits; 446 447 for (i = 0; i < 4; i++) { 448 digits = put_dec_trunc(temp, addr[i]) - temp; 449 /* reverse the digits in the quad */ 450 while (digits--) 451 *p++ = temp[digits]; 452 if (i != 3) 453 *p++ = '.'; 454 } 455 *p = '\0'; 456 457 return string(buf, ip4_addr, field_width, precision, flags & ~SPECIAL); 458 } 459 #endif 460 461 /* 462 * Show a '%p' thing. A kernel extension is that the '%p' is followed 463 * by an extra set of alphanumeric characters that are extended format 464 * specifiers. 465 * 466 * Right now we handle: 467 * 468 * - 'M' For a 6-byte MAC address, it prints the address in the 469 * usual colon-separated hex notation 470 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated 471 * decimal for v4 and colon separated network-order 16 bit hex for v6) 472 * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is 473 * currently the same 474 * 475 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 476 * function pointers are really function descriptors, which contain a 477 * pointer to the real address. 478 */ 479 static char *pointer(const char *fmt, char *buf, void *ptr, int field_width, int precision, int flags) 480 { 481 if (!ptr) 482 return string(buf, "(null)", field_width, precision, flags); 483 484 #ifdef CONFIG_CMD_NET 485 switch (*fmt) { 486 case 'm': 487 flags |= SPECIAL; 488 /* Fallthrough */ 489 case 'M': 490 return mac_address_string(buf, ptr, field_width, precision, flags); 491 case 'i': 492 flags |= SPECIAL; 493 /* Fallthrough */ 494 case 'I': 495 if (fmt[1] == '6') 496 return ip6_addr_string(buf, ptr, field_width, precision, flags); 497 if (fmt[1] == '4') 498 return ip4_addr_string(buf, ptr, field_width, precision, flags); 499 flags &= ~SPECIAL; 500 break; 501 } 502 #endif 503 flags |= SMALL; 504 if (field_width == -1) { 505 field_width = 2*sizeof(void *); 506 flags |= ZEROPAD; 507 } 508 return number(buf, (unsigned long) ptr, 16, field_width, precision, flags); 509 } 510 511 /** 512 * vsprintf - Format a string and place it in a buffer 513 * @buf: The buffer to place the result into 514 * @fmt: The format string to use 515 * @args: Arguments for the format string 516 * 517 * This function follows C99 vsprintf, but has some extensions: 518 * %pS output the name of a text symbol 519 * %pF output the name of a function pointer 520 * %pR output the address range in a struct resource 521 * 522 * The function returns the number of characters written 523 * into @buf. 524 * 525 * Call this function if you are already dealing with a va_list. 526 * You probably want sprintf() instead. 527 */ 528 int vsprintf(char *buf, const char *fmt, va_list args) 529 { 530 unsigned NUM_TYPE num; 531 int base; 532 char *str; 533 534 int flags; /* flags to number() */ 535 536 int field_width; /* width of output field */ 537 int precision; /* min. # of digits for integers; max 538 number of chars for from string */ 539 int qualifier; /* 'h', 'l', or 'L' for integer fields */ 540 /* 'z' support added 23/7/1999 S.H. */ 541 /* 'z' changed to 'Z' --davidm 1/25/99 */ 542 /* 't' added for ptrdiff_t */ 543 544 str = buf; 545 546 for (; *fmt ; ++fmt) { 547 if (*fmt != '%') { 548 *str++ = *fmt; 549 continue; 550 } 551 552 /* process flags */ 553 flags = 0; 554 repeat: 555 ++fmt; /* this also skips first '%' */ 556 switch (*fmt) { 557 case '-': flags |= LEFT; goto repeat; 558 case '+': flags |= PLUS; goto repeat; 559 case ' ': flags |= SPACE; goto repeat; 560 case '#': flags |= SPECIAL; goto repeat; 561 case '0': flags |= ZEROPAD; goto repeat; 562 } 563 564 /* get field width */ 565 field_width = -1; 566 if (is_digit(*fmt)) 567 field_width = skip_atoi(&fmt); 568 else if (*fmt == '*') { 569 ++fmt; 570 /* it's the next argument */ 571 field_width = va_arg(args, int); 572 if (field_width < 0) { 573 field_width = -field_width; 574 flags |= LEFT; 575 } 576 } 577 578 /* get the precision */ 579 precision = -1; 580 if (*fmt == '.') { 581 ++fmt; 582 if (is_digit(*fmt)) 583 precision = skip_atoi(&fmt); 584 else if (*fmt == '*') { 585 ++fmt; 586 /* it's the next argument */ 587 precision = va_arg(args, int); 588 } 589 if (precision < 0) 590 precision = 0; 591 } 592 593 /* get the conversion qualifier */ 594 qualifier = -1; 595 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || 596 *fmt == 'Z' || *fmt == 'z' || *fmt == 't') { 597 qualifier = *fmt; 598 ++fmt; 599 if (qualifier == 'l' && *fmt == 'l') { 600 qualifier = 'L'; 601 ++fmt; 602 } 603 } 604 605 /* default base */ 606 base = 10; 607 608 switch (*fmt) { 609 case 'c': 610 if (!(flags & LEFT)) 611 while (--field_width > 0) 612 *str++ = ' '; 613 *str++ = (unsigned char) va_arg(args, int); 614 while (--field_width > 0) 615 *str++ = ' '; 616 continue; 617 618 case 's': 619 str = string(str, va_arg(args, char *), field_width, precision, flags); 620 continue; 621 622 case 'p': 623 str = pointer(fmt+1, str, 624 va_arg(args, void *), 625 field_width, precision, flags); 626 /* Skip all alphanumeric pointer suffixes */ 627 while (isalnum(fmt[1])) 628 fmt++; 629 continue; 630 631 case 'n': 632 if (qualifier == 'l') { 633 long * ip = va_arg(args, long *); 634 *ip = (str - buf); 635 } else { 636 int * ip = va_arg(args, int *); 637 *ip = (str - buf); 638 } 639 continue; 640 641 case '%': 642 *str++ = '%'; 643 continue; 644 645 /* integer number formats - set up the flags and "break" */ 646 case 'o': 647 base = 8; 648 break; 649 650 case 'x': 651 flags |= SMALL; 652 case 'X': 653 base = 16; 654 break; 655 656 case 'd': 657 case 'i': 658 flags |= SIGN; 659 case 'u': 660 break; 661 662 default: 663 *str++ = '%'; 664 if (*fmt) 665 *str++ = *fmt; 666 else 667 --fmt; 668 continue; 669 } 670 if (qualifier == 'L') /* "quad" for 64 bit variables */ 671 num = va_arg(args, unsigned long long); 672 else if (qualifier == 'l') { 673 num = va_arg(args, unsigned long); 674 if (flags & SIGN) 675 num = (signed long) num; 676 } else if (qualifier == 'Z' || qualifier == 'z') { 677 num = va_arg(args, size_t); 678 } else if (qualifier == 't') { 679 num = va_arg(args, ptrdiff_t); 680 } else if (qualifier == 'h') { 681 num = (unsigned short) va_arg(args, int); 682 if (flags & SIGN) 683 num = (signed short) num; 684 } else { 685 num = va_arg(args, unsigned int); 686 if (flags & SIGN) 687 num = (signed int) num; 688 } 689 str = number(str, num, base, field_width, precision, flags); 690 } 691 *str = '\0'; 692 return str-buf; 693 } 694 695 /** 696 * sprintf - Format a string and place it in a buffer 697 * @buf: The buffer to place the result into 698 * @fmt: The format string to use 699 * @...: Arguments for the format string 700 * 701 * The function returns the number of characters written 702 * into @buf. 703 * 704 * See the vsprintf() documentation for format string extensions over C99. 705 */ 706 int sprintf(char * buf, const char *fmt, ...) 707 { 708 va_list args; 709 int i; 710 711 va_start(args, fmt); 712 i=vsprintf(buf,fmt,args); 713 va_end(args); 714 return i; 715 } 716 717 void panic(const char *fmt, ...) 718 { 719 va_list args; 720 va_start(args, fmt); 721 vprintf(fmt, args); 722 putc('\n'); 723 va_end(args); 724 #if defined (CONFIG_PANIC_HANG) 725 hang(); 726 #else 727 udelay (100000); /* allow messages to go out */ 728 do_reset (NULL, 0, 0, NULL); 729 #endif 730 } 731