lib/vsprintf.c

   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 /*
  13  * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
  14  * - changed to provide snprintf and vsnprintf functions
  15  * So Feb  1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
  16  * - scnprintf and vscnprintf
  17  */
  18
  19 #include <stdarg.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/ctype.h>
  24 #include <linux/kernel.h>
  25 #include <linux/kallsyms.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/ioport.h>
  28
  29 #include <asm/page.h>           /* for PAGE_SIZE */
  30 #include <asm/div64.h>
  31 #include <asm/sections.h>       /* for dereference_function_descriptor() */
  32
  33 /* Works only for digits and letters, but small and fast */
  34 #define TOLOWER(x) ((x) | 0x20)
  35
  36 static unsigned int simple_guess_base(const char *cp)
  37 {
  38         if (cp[0] == '0') {
  39                 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
  40                         return 16;
  41                 else
  42                         return 8;
  43         } else {
  44                 return 10;
  45         }
  46 }
  47
  48 /**
  49  * simple_strtoul - convert a string to an unsigned long
  50  * @cp: The start of the string
  51  * @endp: A pointer to the end of the parsed string will be placed here
  52  * @base: The number base to use
  53  */
  54 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
  55 {
  56         unsigned long result = 0;
  57
  58         if (!base)
  59                 base = simple_guess_base(cp);
  60
  61         if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
  62                 cp += 2;
  63
  64         while (isxdigit(*cp)) {
  65                 unsigned int value;
  66
  67                 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
  68                 if (value >= base)
  69                         break;
  70                 result = result * base + value;
  71                 cp++;
  72         }
  73
  74         if (endp)
  75                 *endp = (char *)cp;
  76         return result;
  77 }
  78 EXPORT_SYMBOL(simple_strtoul);
  79
  80 /**
  81  * simple_strtol - convert a string to a signed long
  82  * @cp: The start of the string
  83  * @endp: A pointer to the end of the parsed string will be placed here
  84  * @base: The number base to use
  85  */
  86 long simple_strtol(const char *cp, char **endp, unsigned int base)
  87 {
  88         if(*cp == '-')
  89                 return -simple_strtoul(cp + 1, endp, base);
  90         return simple_strtoul(cp, endp, base);
  91 }
  92 EXPORT_SYMBOL(simple_strtol);
  93
  94 /**
  95  * simple_strtoull - convert a string to an unsigned long long
  96  * @cp: The start of the string
  97  * @endp: A pointer to the end of the parsed string will be placed here
  98  * @base: The number base to use
  99  */
 100 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
 101 {
 102         unsigned long long result = 0;
 103
 104         if (!base)
 105                 base = simple_guess_base(cp);
 106
 107         if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
 108                 cp += 2;
 109
 110         while (isxdigit(*cp)) {
 111                 unsigned int value;
 112
 113                 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
 114                 if (value >= base)
 115                         break;
 116                 result = result * base + value;
 117                 cp++;
 118         }
 119
 120         if (endp)
 121                 *endp = (char *)cp;
 122         return result;
 123 }
 124 EXPORT_SYMBOL(simple_strtoull);
 125
 126 /**
 127  * simple_strtoll - convert a string to a signed long long
 128  * @cp: The start of the string
 129  * @endp: A pointer to the end of the parsed string will be placed here
 130  * @base: The number base to use
 131  */
 132 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
 133 {
 134         if(*cp=='-')
 135                 return -simple_strtoull(cp + 1, endp, base);
 136         return simple_strtoull(cp, endp, base);
 137 }
 138
 139 /**
 140  * strict_strtoul - convert a string to an unsigned long strictly
 141  * @cp: The string to be converted
 142  * @base: The number base to use
 143  * @res: The converted result value
 144  *
 145  * strict_strtoul converts a string to an unsigned long only if the
 146  * string is really an unsigned long string, any string containing
 147  * any invalid char at the tail will be rejected and -EINVAL is returned,
 148  * only a newline char at the tail is acceptible because people generally
 149  * change a module parameter in the following way:
 150  *
 151  *      echo 1024 > /sys/module/e1000/parameters/copybreak
 152  *
 153  * echo will append a newline to the tail.
 154  *
 155  * It returns 0 if conversion is successful and *res is set to the converted
 156  * value, otherwise it returns -EINVAL and *res is set to 0.
 157  *
 158  * simple_strtoul just ignores the successive invalid characters and
 159  * return the converted value of prefix part of the string.
 160  */
 161 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
 162 {
 163         char *tail;
 164         unsigned long val;
 165         size_t len;
 166
 167         *res = 0;
 168         len = strlen(cp);
 169         if (len == 0)
 170                 return -EINVAL;
 171
 172         val = simple_strtoul(cp, &tail, base);
 173         if (tail == cp)
 174                 return -EINVAL;
 175         if ((*tail == '\0') ||
 176                 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
 177                 *res = val;
 178                 return 0;
 179         }
 180
 181         return -EINVAL;
 182 }
 183 EXPORT_SYMBOL(strict_strtoul);
 184
 185 /**
 186  * strict_strtol - convert a string to a long strictly
 187  * @cp: The string to be converted
 188  * @base: The number base to use
 189  * @res: The converted result value
 190  *
 191  * strict_strtol is similiar to strict_strtoul, but it allows the first
 192  * character of a string is '-'.
 193  *
 194  * It returns 0 if conversion is successful and *res is set to the converted
 195  * value, otherwise it returns -EINVAL and *res is set to 0.
 196  */
 197 int strict_strtol(const char *cp, unsigned int base, long *res)
 198 {
 199         int ret;
 200         if (*cp == '-') {
 201                 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
 202                 if (!ret)
 203                         *res = -(*res);
 204         } else {
 205                 ret = strict_strtoul(cp, base, (unsigned long *)res);
 206         }
 207
 208         return ret;
 209 }
 210 EXPORT_SYMBOL(strict_strtol);
 211
 212 /**
 213  * strict_strtoull - convert a string to an unsigned long long strictly
 214  * @cp: The string to be converted
 215  * @base: The number base to use
 216  * @res: The converted result value
 217  *
 218  * strict_strtoull converts a string to an unsigned long long only if the
 219  * string is really an unsigned long long string, any string containing
 220  * any invalid char at the tail will be rejected and -EINVAL is returned,
 221  * only a newline char at the tail is acceptible because people generally
 222  * change a module parameter in the following way:
 223  *
 224  *      echo 1024 > /sys/module/e1000/parameters/copybreak
 225  *
 226  * echo will append a newline to the tail of the string.
 227  *
 228  * It returns 0 if conversion is successful and *res is set to the converted
 229  * value, otherwise it returns -EINVAL and *res is set to 0.
 230  *
 231  * simple_strtoull just ignores the successive invalid characters and
 232  * return the converted value of prefix part of the string.
 233  */
 234 int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
 235 {
 236         char *tail;
 237         unsigned long long val;
 238         size_t len;
 239
 240         *res = 0;
 241         len = strlen(cp);
 242         if (len == 0)
 243                 return -EINVAL;
 244
 245         val = simple_strtoull(cp, &tail, base);
 246         if (tail == cp)
 247                 return -EINVAL;
 248         if ((*tail == '\0') ||
 249                 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
 250                 *res = val;
 251                 return 0;
 252         }
 253
 254         return -EINVAL;
 255 }
 256 EXPORT_SYMBOL(strict_strtoull);
 257
 258 /**
 259  * strict_strtoll - convert a string to a long long strictly
 260  * @cp: The string to be converted
 261  * @base: The number base to use
 262  * @res: The converted result value
 263  *
 264  * strict_strtoll is similiar to strict_strtoull, but it allows the first
 265  * character of a string is '-'.
 266  *
 267  * It returns 0 if conversion is successful and *res is set to the converted
 268  * value, otherwise it returns -EINVAL and *res is set to 0.
 269  */
 270 int strict_strtoll(const char *cp, unsigned int base, long long *res)
 271 {
 272         int ret;
 273         if (*cp == '-') {
 274                 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
 275                 if (!ret)
 276                         *res = -(*res);
 277         } else {
 278                 ret = strict_strtoull(cp, base, (unsigned long long *)res);
 279         }
 280
 281         return ret;
 282 }
 283 EXPORT_SYMBOL(strict_strtoll);
 284
 285 static int skip_atoi(const char **s)
 286 {
 287         int i=0;
 288
 289         while (isdigit(**s))
 290                 i = i*10 + *((*s)++) - '0';
 291         return i;
 292 }
 293
 294 /* Decimal conversion is by far the most typical, and is used
 295  * for /proc and /sys data. This directly impacts e.g. top performance
 296  * with many processes running. We optimize it for speed
 297  * using code from
 298  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 299  * (with permission from the author, Douglas W. Jones). */
 300
 301 /* Formats correctly any integer in [0,99999].
 302  * Outputs from one to five digits depending on input.
 303  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
 304 static char* put_dec_trunc(char *buf, unsigned q)
 305 {
 306         unsigned d3, d2, d1, d0;
 307         d1 = (q>>4) & 0xf;
 308         d2 = (q>>8) & 0xf;
 309         d3 = (q>>12);
 310
 311         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 312         q = (d0 * 0xcd) >> 11;
 313         d0 = d0 - 10*q;
 314         *buf++ = d0 + '0'; /* least significant digit */
 315         d1 = q + 9*d3 + 5*d2 + d1;
 316         if (d1 != 0) {
 317                 q = (d1 * 0xcd) >> 11;
 318                 d1 = d1 - 10*q;
 319                 *buf++ = d1 + '0'; /* next digit */
 320
 321                 d2 = q + 2*d2;
 322                 if ((d2 != 0) || (d3 != 0)) {
 323                         q = (d2 * 0xd) >> 7;
 324                         d2 = d2 - 10*q;
 325                         *buf++ = d2 + '0'; /* next digit */
 326
 327                         d3 = q + 4*d3;
 328                         if (d3 != 0) {
 329                                 q = (d3 * 0xcd) >> 11;
 330                                 d3 = d3 - 10*q;
 331                                 *buf++ = d3 + '0';  /* next digit */
 332                                 if (q != 0)
 333                                         *buf++ = q + '0';  /* most sign. digit */
 334                         }
 335                 }
 336         }
 337         return buf;
 338 }
 339 /* Same with if's removed. Always emits five digits */
 340 static char* put_dec_full(char *buf, unsigned q)
 341 {
 342         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
 343         /* but anyway, gcc produces better code with full-sized ints */
 344         unsigned d3, d2, d1, d0;
 345         d1 = (q>>4) & 0xf;
 346         d2 = (q>>8) & 0xf;
 347         d3 = (q>>12);
 348
 349         /* Possible ways to approx. divide by 10 */
 350         /* gcc -O2 replaces multiply with shifts and adds */
 351         // (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 352         // (x * 0x67) >> 10:  1100111
 353         // (x * 0x34) >> 9:    110100 - same
 354         // (x * 0x1a) >> 8:     11010 - same
 355         // (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 356
 357         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 358         q = (d0 * 0xcd) >> 11;
 359         d0 = d0 - 10*q;
 360         *buf++ = d0 + '0';
 361         d1 = q + 9*d3 + 5*d2 + d1;
 362                 q = (d1 * 0xcd) >> 11;
 363                 d1 = d1 - 10*q;
 364                 *buf++ = d1 + '0';
 365
 366                 d2 = q + 2*d2;
 367                         q = (d2 * 0xd) >> 7;
 368                         d2 = d2 - 10*q;
 369                         *buf++ = d2 + '0';
 370
 371                         d3 = q + 4*d3;
 372                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 373                                 /* q = (d3 * 0x67) >> 10; - would also work */
 374                                 d3 = d3 - 10*q;
 375                                 *buf++ = d3 + '0';
 376                                         *buf++ = q + '0';
 377         return buf;
 378 }
 379 /* No inlining helps gcc to use registers better */
 380 static noinline char* put_dec(char *buf, unsigned long long num)
 381 {
 382         while (1) {
 383                 unsigned rem;
 384                 if (num < 100000)
 385                         return put_dec_trunc(buf, num);
 386                 rem = do_div(num, 100000);
 387                 buf = put_dec_full(buf, rem);
 388         }
 389 }
 390
 391 #define ZEROPAD 1               /* pad with zero */
 392 #define SIGN    2               /* unsigned/signed long */
 393 #define PLUS    4               /* show plus */
 394 #define SPACE   8               /* space if plus */
 395 #define LEFT    16              /* left justified */
 396 #define SMALL   32              /* Must be 32 == 0x20 */
 397 #define SPECIAL 64              /* 0x */
 398
 399 enum format_type {
 400         FORMAT_TYPE_NONE, /* Just a string part */
 401         FORMAT_TYPE_WIDTH,
 402         FORMAT_TYPE_PRECISION,
 403         FORMAT_TYPE_CHAR,
 404         FORMAT_TYPE_STR,
 405         FORMAT_TYPE_PTR,
 406         FORMAT_TYPE_PERCENT_CHAR,
 407         FORMAT_TYPE_INVALID,
 408         FORMAT_TYPE_LONG_LONG,
 409         FORMAT_TYPE_ULONG,
 410         FORMAT_TYPE_LONG,
 411         FORMAT_TYPE_UBYTE,
 412         FORMAT_TYPE_BYTE,
 413         FORMAT_TYPE_USHORT,
 414         FORMAT_TYPE_SHORT,
 415         FORMAT_TYPE_UINT,
 416         FORMAT_TYPE_INT,
 417         FORMAT_TYPE_NRCHARS,
 418         FORMAT_TYPE_SIZE_T,
 419         FORMAT_TYPE_PTRDIFF
 420 };
 421
 422 struct printf_spec {
 423         enum format_type        type;
 424         int                     flags;          /* flags to number() */
 425         int                     field_width;    /* width of output field */
 426         int                     base;
 427         int                     precision;      /* # of digits/chars */
 428         int                     qualifier;
 429 };
 430
 431 static char *number(char *buf, char *end, unsigned long long num,
 432                         struct printf_spec spec)
 433 {
 434         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 435         static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
 436
 437         char tmp[66];
 438         char sign;
 439         char locase;
 440         int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
 441         int i;
 442
 443         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 444          * produces same digits or (maybe lowercased) letters */
 445         locase = (spec.flags & SMALL);
 446         if (spec.flags & LEFT)
 447                 spec.flags &= ~ZEROPAD;
 448         sign = 0;
 449         if (spec.flags & SIGN) {
 450                 if ((signed long long) num < 0) {
 451                         sign = '-';
 452                         num = - (signed long long) num;
 453                         spec.field_width--;
 454                 } else if (spec.flags & PLUS) {
 455                         sign = '+';
 456                         spec.field_width--;
 457                 } else if (spec.flags & SPACE) {
 458                         sign = ' ';
 459                         spec.field_width--;
 460                 }
 461         }
 462         if (need_pfx) {
 463                 spec.field_width--;
 464                 if (spec.base == 16)
 465                         spec.field_width--;
 466         }
 467
 468         /* generate full string in tmp[], in reverse order */
 469         i = 0;
 470         if (num == 0)
 471                 tmp[i++] = '0';
 472         /* Generic code, for any base:
 473         else do {
 474                 tmp[i++] = (digits[do_div(num,base)] | locase);
 475         } while (num != 0);
 476         */
 477         else if (spec.base != 10) { /* 8 or 16 */
 478                 int mask = spec.base - 1;
 479                 int shift = 3;
 480                 if (spec.base == 16) shift = 4;
 481                 do {
 482                         tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
 483                         num >>= shift;
 484                 } while (num);
 485         } else { /* base 10 */
 486                 i = put_dec(tmp, num) - tmp;
 487         }
 488
 489         /* printing 100 using %2d gives "100", not "00" */
 490         if (i > spec.precision)
 491                 spec.precision = i;
 492         /* leading space padding */
 493         spec.field_width -= spec.precision;
 494         if (!(spec.flags & (ZEROPAD+LEFT))) {
 495                 while(--spec.field_width >= 0) {
 496                         if (buf < end)
 497                                 *buf = ' ';
 498                         ++buf;
 499                 }
 500         }
 501         /* sign */
 502         if (sign) {
 503                 if (buf < end)
 504                         *buf = sign;
 505                 ++buf;
 506         }
 507         /* "0x" / "0" prefix */
 508         if (need_pfx) {
 509                 if (buf < end)
 510                         *buf = '0';
 511                 ++buf;
 512                 if (spec.base == 16) {
 513                         if (buf < end)
 514                                 *buf = ('X' | locase);
 515                         ++buf;
 516                 }
 517         }
 518         /* zero or space padding */
 519         if (!(spec.flags & LEFT)) {
 520                 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
 521                 while (--spec.field_width >= 0) {
 522                         if (buf < end)
 523                                 *buf = c;
 524                         ++buf;
 525                 }
 526         }
 527         /* hmm even more zero padding? */
 528         while (i <= --spec.precision) {
 529                 if (buf < end)
 530                         *buf = '0';
 531                 ++buf;
 532         }
 533         /* actual digits of result */
 534         while (--i >= 0) {
 535                 if (buf < end)
 536                         *buf = tmp[i];
 537                 ++buf;
 538         }
 539         /* trailing space padding */
 540         while (--spec.field_width >= 0) {
 541                 if (buf < end)
 542                         *buf = ' ';
 543                 ++buf;
 544         }
 545         return buf;
 546 }
 547
 548 static char *string(char *buf, char *end, char *s, struct printf_spec spec)
 549 {
 550         int len, i;
 551
 552         if ((unsigned long)s < PAGE_SIZE)
 553                 s = "<NULL>";
 554
 555         len = strnlen(s, spec.precision);
 556
 557         if (!(spec.flags & LEFT)) {
 558                 while (len < spec.field_width--) {
 559                         if (buf < end)
 560                                 *buf = ' ';
 561                         ++buf;
 562                 }
 563         }
 564         for (i = 0; i < len; ++i) {
 565                 if (buf < end)
 566                         *buf = *s;
 567                 ++buf; ++s;
 568         }
 569         while (len < spec.field_width--) {
 570                 if (buf < end)
 571                         *buf = ' ';
 572                 ++buf;
 573         }
 574         return buf;
 575 }
 576
 577 static char *symbol_string(char *buf, char *end, void *ptr,
 578                                 struct printf_spec spec, char ext)
 579 {
 580         unsigned long value = (unsigned long) ptr;
 581 #ifdef CONFIG_KALLSYMS
 582         char sym[KSYM_SYMBOL_LEN];
 583         if (ext != 'f')
 584                 sprint_symbol(sym, value);
 585         else
 586                 kallsyms_lookup(value, NULL, NULL, NULL, sym);
 587         return string(buf, end, sym, spec);
 588 #else
 589         spec.field_width = 2*sizeof(void *);
 590         spec.flags |= SPECIAL | SMALL | ZEROPAD;
 591         spec.base = 16;
 592         return number(buf, end, value, spec);
 593 #endif
 594 }
 595
 596 static char *resource_string(char *buf, char *end, struct resource *res,
 597                                 struct printf_spec spec)
 598 {
 599 #ifndef IO_RSRC_PRINTK_SIZE
 600 #define IO_RSRC_PRINTK_SIZE     4
 601 #endif
 602
 603 #ifndef MEM_RSRC_PRINTK_SIZE
 604 #define MEM_RSRC_PRINTK_SIZE    8
 605 #endif
 606         struct printf_spec num_spec = {
 607                 .base = 16,
 608                 .precision = -1,
 609                 .flags = SPECIAL | SMALL | ZEROPAD,
 610         };
 611         /* room for the actual numbers, the two "0x", -, [, ] and the final zero */
 612         char sym[4*sizeof(resource_size_t) + 8];
 613         char *p = sym, *pend = sym + sizeof(sym);
 614         int size = -1;
 615
 616         if (res->flags & IORESOURCE_IO)
 617                 size = IO_RSRC_PRINTK_SIZE;
 618         else if (res->flags & IORESOURCE_MEM)
 619                 size = MEM_RSRC_PRINTK_SIZE;
 620
 621         *p++ = '[';
 622         num_spec.field_width = size;
 623         p = number(p, pend, res->start, num_spec);
 624         *p++ = '-';
 625         p = number(p, pend, res->end, num_spec);
 626         *p++ = ']';
 627         *p = 0;
 628
 629         return string(buf, end, sym, spec);
 630 }
 631
 632 static char *mac_address_string(char *buf, char *end, u8 *addr,
 633                                 struct printf_spec spec)
 634 {
 635         char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
 636         char *p = mac_addr;
 637         int i;
 638
 639         for (i = 0; i < 6; i++) {
 640                 p = pack_hex_byte(p, addr[i]);
 641                 if (!(spec.flags & SPECIAL) && i != 5)
 642                         *p++ = ':';
 643         }
 644         *p = '\0';
 645         spec.flags &= ~SPECIAL;
 646
 647         return string(buf, end, mac_addr, spec);
 648 }
 649
 650 static char *ip6_addr_string(char *buf, char *end, u8 *addr,
 651                                 struct printf_spec spec)
 652 {
 653         char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
 654         char *p = ip6_addr;
 655         int i;
 656
 657         for (i = 0; i < 8; i++) {
 658                 p = pack_hex_byte(p, addr[2 * i]);
 659                 p = pack_hex_byte(p, addr[2 * i + 1]);
 660                 if (!(spec.flags & SPECIAL) && i != 7)
 661                         *p++ = ':';
 662         }
 663         *p = '\0';
 664         spec.flags &= ~SPECIAL;
 665
 666         return string(buf, end, ip6_addr, spec);
 667 }
 668
 669 static char *ip4_addr_string(char *buf, char *end, u8 *addr,
 670                                 struct printf_spec spec)
 671 {
 672         char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
 673         char temp[3];   /* hold each IP quad in reverse order */
 674         char *p = ip4_addr;
 675         int i, digits;
 676
 677         for (i = 0; i < 4; i++) {
 678                 digits = put_dec_trunc(temp, addr[i]) - temp;
 679                 /* reverse the digits in the quad */
 680                 while (digits--)
 681                         *p++ = temp[digits];
 682                 if (i != 3)
 683                         *p++ = '.';
 684         }
 685         *p = '\0';
 686         spec.flags &= ~SPECIAL;
 687
 688         return string(buf, end, ip4_addr, spec);
 689 }
 690
 691 /*
 692  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 693  * by an extra set of alphanumeric characters that are extended format
 694  * specifiers.
 695  *
 696  * Right now we handle:
 697  *
 698  * - 'F' For symbolic function descriptor pointers with offset
 699  * - 'f' For simple symbolic function names without offset
 700  * - 'S' For symbolic direct pointers
 701  * - 'R' For a struct resource pointer, it prints the range of
 702  *       addresses (not the name nor the flags)
 703  * - 'M' For a 6-byte MAC address, it prints the address in the
 704  *       usual colon-separated hex notation
 705  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 706  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 707  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 708  *       currently the same
 709  *
 710  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 711  * function pointers are really function descriptors, which contain a
 712  * pointer to the real address.
 713  */
 714 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 715                         struct printf_spec spec)
 716 {
 717         if (!ptr)
 718                 return string(buf, end, "(null)", spec);
 719
 720         switch (*fmt) {
 721         case 'F':
 722         case 'f':
 723                 ptr = dereference_function_descriptor(ptr);
 724                 /* Fallthrough */
 725         case 'S':
 726                 return symbol_string(buf, end, ptr, spec, *fmt);
 727         case 'R':
 728                 return resource_string(buf, end, ptr, spec);
 729         case 'm':
 730                 spec.flags |= SPECIAL;
 731                 /* Fallthrough */
 732         case 'M':
 733                 return mac_address_string(buf, end, ptr, spec);
 734         case 'i':
 735                 spec.flags |= SPECIAL;
 736                 /* Fallthrough */
 737         case 'I':
 738                 if (fmt[1] == '6')
 739                         return ip6_addr_string(buf, end, ptr, spec);
 740                 if (fmt[1] == '4')
 741                         return ip4_addr_string(buf, end, ptr, spec);
 742                 spec.flags &= ~SPECIAL;
 743                 break;
 744         }
 745         spec.flags |= SMALL;
 746         if (spec.field_width == -1) {
 747                 spec.field_width = 2*sizeof(void *);
 748                 spec.flags |= ZEROPAD;
 749         }
 750         spec.base = 16;
 751
 752         return number(buf, end, (unsigned long) ptr, spec);
 753 }
 754
 755 /*
 756  * Helper function to decode printf style format.
 757  * Each call decode a token from the format and return the
 758  * number of characters read (or likely the delta where it wants
 759  * to go on the next call).
 760  * The decoded token is returned through the parameters
 761  *
 762  * 'h', 'l', or 'L' for integer fields
 763  * 'z' support added 23/7/1999 S.H.
 764  * 'z' changed to 'Z' --davidm 1/25/99
 765  * 't' added for ptrdiff_t
 766  *
 767  * @fmt: the format string
 768  * @type of the token returned
 769  * @flags: various flags such as +, -, # tokens..
 770  * @field_width: overwritten width
 771  * @base: base of the number (octal, hex, ...)
 772  * @precision: precision of a number
 773  * @qualifier: qualifier of a number (long, size_t, ...)
 774  */
 775 static int format_decode(const char *fmt, struct printf_spec *spec)
 776 {
 777         const char *start = fmt;
 778
 779         /* we finished early by reading the field width */
 780         if (spec->type == FORMAT_TYPE_WIDTH) {
 781                 if (spec->field_width < 0) {
 782                         spec->field_width = -spec->field_width;
 783                         spec->flags |= LEFT;
 784                 }
 785                 spec->type = FORMAT_TYPE_NONE;
 786                 goto precision;
 787         }
 788
 789         /* we finished early by reading the precision */
 790         if (spec->type == FORMAT_TYPE_PRECISION) {
 791                 if (spec->precision < 0)
 792                         spec->precision = 0;
 793
 794                 spec->type = FORMAT_TYPE_NONE;
 795                 goto qualifier;
 796         }
 797
 798         /* By default */
 799         spec->type = FORMAT_TYPE_NONE;
 800
 801         for (; *fmt ; ++fmt) {
 802                 if (*fmt == '%')
 803                         break;
 804         }
 805
 806         /* Return the current non-format string */
 807         if (fmt != start || !*fmt)
 808                 return fmt - start;
 809
 810         /* Process flags */
 811         spec->flags = 0;
 812
 813         while (1) { /* this also skips first '%' */
 814                 bool found = true;
 815
 816                 ++fmt;
 817
 818                 switch (*fmt) {
 819                 case '-': spec->flags |= LEFT;    break;
 820                 case '+': spec->flags |= PLUS;    break;
 821                 case ' ': spec->flags |= SPACE;   break;
 822                 case '#': spec->flags |= SPECIAL; break;
 823                 case '0': spec->flags |= ZEROPAD; break;
 824                 default:  found = false;
 825                 }
 826
 827                 if (!found)
 828                         break;
 829         }
 830
 831         /* get field width */
 832         spec->field_width = -1;
 833
 834         if (isdigit(*fmt))
 835                 spec->field_width = skip_atoi(&fmt);
 836         else if (*fmt == '*') {
 837                 /* it's the next argument */
 838                 spec->type = FORMAT_TYPE_WIDTH;
 839                 return ++fmt - start;
 840         }
 841
 842 precision:
 843         /* get the precision */
 844         spec->precision = -1;
 845         if (*fmt == '.') {
 846                 ++fmt;
 847                 if (isdigit(*fmt)) {
 848                         spec->precision = skip_atoi(&fmt);
 849                         if (spec->precision < 0)
 850                                 spec->precision = 0;
 851                 } else if (*fmt == '*') {
 852                         /* it's the next argument */
 853                         spec->type = FORMAT_TYPE_PRECISION;
 854                         return ++fmt - start;
 855                 }
 856         }
 857
 858 qualifier:
 859         /* get the conversion qualifier */
 860         spec->qualifier = -1;
 861         if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 862             *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 863                 spec->qualifier = *fmt++;
 864                 if (unlikely(spec->qualifier == *fmt)) {
 865                         if (spec->qualifier == 'l') {
 866                                 spec->qualifier = 'L';
 867                                 ++fmt;
 868                         } else if (spec->qualifier == 'h') {
 869                                 spec->qualifier = 'H';
 870                                 ++fmt;
 871                         }
 872                 }
 873         }
 874
 875         /* default base */
 876         spec->base = 10;
 877         switch (*fmt) {
 878         case 'c':
 879                 spec->type = FORMAT_TYPE_CHAR;
 880                 return ++fmt - start;
 881
 882         case 's':
 883                 spec->type = FORMAT_TYPE_STR;
 884                 return ++fmt - start;
 885
 886         case 'p':
 887                 spec->type = FORMAT_TYPE_PTR;
 888                 return fmt - start;
 889                 /* skip alnum */
 890
 891         case 'n':
 892                 spec->type = FORMAT_TYPE_NRCHARS;
 893                 return ++fmt - start;
 894
 895         case '%':
 896                 spec->type = FORMAT_TYPE_PERCENT_CHAR;
 897                 return ++fmt - start;
 898
 899         /* integer number formats - set up the flags and "break" */
 900         case 'o':
 901                 spec->base = 8;
 902                 break;
 903
 904         case 'x':
 905                 spec->flags |= SMALL;
 906
 907         case 'X':
 908                 spec->base = 16;
 909                 break;
 910
 911         case 'd':
 912         case 'i':
 913                 spec->flags |= SIGN;
 914         case 'u':
 915                 break;
 916
 917         default:
 918                 spec->type = FORMAT_TYPE_INVALID;
 919                 return fmt - start;
 920         }
 921
 922         if (spec->qualifier == 'L')
 923                 spec->type = FORMAT_TYPE_LONG_LONG;
 924         else if (spec->qualifier == 'l') {
 925                 if (spec->flags & SIGN)
 926                         spec->type = FORMAT_TYPE_LONG;
 927                 else
 928                         spec->type = FORMAT_TYPE_ULONG;
 929         } else if (spec->qualifier == 'Z' || spec->qualifier == 'z') {
 930                 spec->type = FORMAT_TYPE_SIZE_T;
 931         } else if (spec->qualifier == 't') {
 932                 spec->type = FORMAT_TYPE_PTRDIFF;
 933         } else if (spec->qualifier == 'H') {
 934                 if (spec->flags & SIGN)
 935                         spec->type = FORMAT_TYPE_BYTE;
 936                 else
 937                         spec->type = FORMAT_TYPE_UBYTE;
 938         } else if (spec->qualifier == 'h') {
 939                 if (spec->flags & SIGN)
 940                         spec->type = FORMAT_TYPE_SHORT;
 941                 else
 942                         spec->type = FORMAT_TYPE_USHORT;
 943         } else {
 944                 if (spec->flags & SIGN)
 945                         spec->type = FORMAT_TYPE_INT;
 946                 else
 947                         spec->type = FORMAT_TYPE_UINT;
 948         }
 949
 950         return ++fmt - start;
 951 }
 952
 953 /**
 954  * vsnprintf - Format a string and place it in a buffer
 955  * @buf: The buffer to place the result into
 956  * @size: The size of the buffer, including the trailing null space
 957  * @fmt: The format string to use
 958  * @args: Arguments for the format string
 959  *
 960  * This function follows C99 vsnprintf, but has some extensions:
 961  * %pS output the name of a text symbol
 962  * %pF output the name of a function pointer with its offset
 963  * %pf output the name of a function pointer without its offset
 964  * %pR output the address range in a struct resource
 965  *
 966  * The return value is the number of characters which would
 967  * be generated for the given input, excluding the trailing
 968  * '\0', as per ISO C99. If you want to have the exact
 969  * number of characters written into @buf as return value
 970  * (not including the trailing '\0'), use vscnprintf(). If the
 971  * return is greater than or equal to @size, the resulting
 972  * string is truncated.
 973  *
 974  * Call this function if you are already dealing with a va_list.
 975  * You probably want snprintf() instead.
 976  */
 977 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 978 {
 979         unsigned long long num;
 980         char *str, *end, c;
 981         int read;
 982         struct printf_spec spec = {0};
 983
 984         /* Reject out-of-range values early.  Large positive sizes are
 985            used for unknown buffer sizes. */
 986         if (unlikely((int) size < 0)) {
 987                 /* There can be only one.. */
 988                 static char warn = 1;
 989                 WARN_ON(warn);
 990                 warn = 0;
 991                 return 0;
 992         }
 993
 994         str = buf;
 995         end = buf + size;
 996
 997         /* Make sure end is always >= buf */
 998         if (end < buf) {
 999                 end = ((void *)-1);
1000                 size = end - buf;
1001         }
1002
1003         while (*fmt) {
1004                 const char *old_fmt = fmt;
1005
1006                 read = format_decode(fmt, &spec);
1007
1008                 fmt += read;
1009
1010                 switch (spec.type) {
1011                 case FORMAT_TYPE_NONE: {
1012                         int copy = read;
1013                         if (str < end) {
1014                                 if (copy > end - str)
1015                                         copy = end - str;
1016                                 memcpy(str, old_fmt, copy);
1017                         }
1018                         str += read;
1019                         break;
1020                 }
1021
1022                 case FORMAT_TYPE_WIDTH:
1023                         spec.field_width = va_arg(args, int);
1024                         break;
1025
1026                 case FORMAT_TYPE_PRECISION:
1027                         spec.precision = va_arg(args, int);
1028                         break;
1029
1030                 case FORMAT_TYPE_CHAR:
1031                         if (!(spec.flags & LEFT)) {
1032                                 while (--spec.field_width > 0) {
1033                                         if (str < end)
1034                                                 *str = ' ';
1035                                         ++str;
1036
1037                                 }
1038                         }
1039                         c = (unsigned char) va_arg(args, int);
1040                         if (str < end)
1041                                 *str = c;
1042                         ++str;
1043                         while (--spec.field_width > 0) {
1044                                 if (str < end)
1045                                         *str = ' ';
1046                                 ++str;
1047                         }
1048                         break;
1049
1050                 case FORMAT_TYPE_STR:
1051                         str = string(str, end, va_arg(args, char *), spec);
1052                         break;
1053
1054                 case FORMAT_TYPE_PTR:
1055                         str = pointer(fmt+1, str, end, va_arg(args, void *),
1056                                       spec);
1057                         while (isalnum(*fmt))
1058                                 fmt++;
1059                         break;
1060
1061                 case FORMAT_TYPE_PERCENT_CHAR:
1062                         if (str < end)
1063                                 *str = '%';
1064                         ++str;
1065                         break;
1066
1067                 case FORMAT_TYPE_INVALID:
1068                         if (str < end)
1069                                 *str = '%';
1070                         ++str;
1071                         break;
1072
1073                 case FORMAT_TYPE_NRCHARS: {
1074                         int qualifier = spec.qualifier;
1075
1076                         if (qualifier == 'l') {
1077                                 long *ip = va_arg(args, long *);
1078                                 *ip = (str - buf);
1079                         } else if (qualifier == 'Z' ||
1080                                         qualifier == 'z') {
1081                                 size_t *ip = va_arg(args, size_t *);
1082                                 *ip = (str - buf);
1083                         } else {
1084                                 int *ip = va_arg(args, int *);
1085                                 *ip = (str - buf);
1086                         }
1087                         break;
1088                 }
1089
1090                 default:
1091                         switch (spec.type) {
1092                         case FORMAT_TYPE_LONG_LONG:
1093                                 num = va_arg(args, long long);
1094                                 break;
1095                         case FORMAT_TYPE_ULONG:
1096                                 num = va_arg(args, unsigned long);
1097                                 break;
1098                         case FORMAT_TYPE_LONG:
1099                                 num = va_arg(args, long);
1100                                 break;
1101                         case FORMAT_TYPE_SIZE_T:
1102                                 num = va_arg(args, size_t);
1103                                 break;
1104                         case FORMAT_TYPE_PTRDIFF:
1105                                 num = va_arg(args, ptrdiff_t);
1106                                 break;
1107                         case FORMAT_TYPE_UBYTE:
1108                                 num = (unsigned char) va_arg(args, int);
1109                                 break;
1110                         case FORMAT_TYPE_BYTE:
1111                                 num = (signed char) va_arg(args, int);
1112                                 break;
1113                         case FORMAT_TYPE_USHORT:
1114                                 num = (unsigned short) va_arg(args, int);
1115                                 break;
1116                         case FORMAT_TYPE_SHORT:
1117                                 num = (short) va_arg(args, int);
1118                                 break;
1119                         case FORMAT_TYPE_INT:
1120                                 num = (int) va_arg(args, int);
1121                                 break;
1122                         default:
1123                                 num = va_arg(args, unsigned int);
1124                         }
1125
1126                         str = number(str, end, num, spec);
1127                 }
1128         }
1129
1130         if (size > 0) {
1131                 if (str < end)
1132                         *str = '\0';
1133                 else
1134                         end[-1] = '\0';
1135         }
1136
1137         /* the trailing null byte doesn't count towards the total */
1138         return str-buf;
1139
1140 }
1141 EXPORT_SYMBOL(vsnprintf);
1142
1143 /**
1144  * vscnprintf - Format a string and place it in a buffer
1145  * @buf: The buffer to place the result into
1146  * @size: The size of the buffer, including the trailing null space
1147  * @fmt: The format string to use
1148  * @args: Arguments for the format string
1149  *
1150  * The return value is the number of characters which have been written into
1151  * the @buf not including the trailing '\0'. If @size is <= 0 the function
1152  * returns 0.
1153  *
1154  * Call this function if you are already dealing with a va_list.
1155  * You probably want scnprintf() instead.
1156  *
1157  * See the vsnprintf() documentation for format string extensions over C99.
1158  */
1159 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1160 {
1161         int i;
1162
1163         i=vsnprintf(buf,size,fmt,args);
1164         return (i >= size) ? (size - 1) : i;
1165 }
1166 EXPORT_SYMBOL(vscnprintf);
1167
1168 /**
1169  * snprintf - Format a string and place it in a buffer
1170  * @buf: The buffer to place the result into
1171  * @size: The size of the buffer, including the trailing null space
1172  * @fmt: The format string to use
1173  * @...: Arguments for the format string
1174  *
1175  * The return value is the number of characters which would be
1176  * generated for the given input, excluding the trailing null,
1177  * as per ISO C99.  If the return is greater than or equal to
1178  * @size, the resulting string is truncated.
1179  *
1180  * See the vsnprintf() documentation for format string extensions over C99.
1181  */
1182 int snprintf(char * buf, size_t size, const char *fmt, ...)
1183 {
1184         va_list args;
1185         int i;
1186
1187         va_start(args, fmt);
1188         i=vsnprintf(buf,size,fmt,args);
1189         va_end(args);
1190         return i;
1191 }
1192 EXPORT_SYMBOL(snprintf);
1193
1194 /**
1195  * scnprintf - Format a string and place it in a buffer
1196  * @buf: The buffer to place the result into
1197  * @size: The size of the buffer, including the trailing null space
1198  * @fmt: The format string to use
1199  * @...: Arguments for the format string
1200  *
1201  * The return value is the number of characters written into @buf not including
1202  * the trailing '\0'. If @size is <= 0 the function returns 0.
1203  */
1204
1205 int scnprintf(char * buf, size_t size, const char *fmt, ...)
1206 {
1207         va_list args;
1208         int i;
1209
1210         va_start(args, fmt);
1211         i = vsnprintf(buf, size, fmt, args);
1212         va_end(args);
1213         return (i >= size) ? (size - 1) : i;
1214 }
1215 EXPORT_SYMBOL(scnprintf);
1216
1217 /**
1218  * vsprintf - Format a string and place it in a buffer
1219  * @buf: The buffer to place the result into
1220  * @fmt: The format string to use
1221  * @args: Arguments for the format string
1222  *
1223  * The function returns the number of characters written
1224  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1225  * buffer overflows.
1226  *
1227  * Call this function if you are already dealing with a va_list.
1228  * You probably want sprintf() instead.
1229  *
1230  * See the vsnprintf() documentation for format string extensions over C99.
1231  */
1232 int vsprintf(char *buf, const char *fmt, va_list args)
1233 {
1234         return vsnprintf(buf, INT_MAX, fmt, args);
1235 }
1236 EXPORT_SYMBOL(vsprintf);
1237
1238 /**
1239  * sprintf - Format a string and place it in a buffer
1240  * @buf: The buffer to place the result into
1241  * @fmt: The format string to use
1242  * @...: Arguments for the format string
1243  *
1244  * The function returns the number of characters written
1245  * into @buf. Use snprintf() or scnprintf() in order to avoid
1246  * buffer overflows.
1247  *
1248  * See the vsnprintf() documentation for format string extensions over C99.
1249  */
1250 int sprintf(char * buf, const char *fmt, ...)
1251 {
1252         va_list args;
1253         int i;
1254
1255         va_start(args, fmt);
1256         i=vsnprintf(buf, INT_MAX, fmt, args);
1257         va_end(args);
1258         return i;
1259 }
1260 EXPORT_SYMBOL(sprintf);
1261
1262 #ifdef CONFIG_BINARY_PRINTF
1263 /*
1264  * bprintf service:
1265  * vbin_printf() - VA arguments to binary data
1266  * bstr_printf() - Binary data to text string
1267  */
1268
1269 /**
1270  * vbin_printf - Parse a format string and place args' binary value in a buffer
1271  * @bin_buf: The buffer to place args' binary value
1272  * @size: The size of the buffer(by words(32bits), not characters)
1273  * @fmt: The format string to use
1274  * @args: Arguments for the format string
1275  *
1276  * The format follows C99 vsnprintf, except %n is ignored, and its argument
1277  * is skiped.
1278  *
1279  * The return value is the number of words(32bits) which would be generated for
1280  * the given input.
1281  *
1282  * NOTE:
1283  * If the return value is greater than @size, the resulting bin_buf is NOT
1284  * valid for bstr_printf().
1285  */
1286 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1287 {
1288         struct printf_spec spec = {0};
1289         char *str, *end;
1290         int read;
1291
1292         str = (char *)bin_buf;
1293         end = (char *)(bin_buf + size);
1294
1295 #define save_arg(type)                                                  \
1296 do {                                                                    \
1297         if (sizeof(type) == 8) {                                        \
1298                 unsigned long long value;                               \
1299                 str = PTR_ALIGN(str, sizeof(u32));                      \
1300                 value = va_arg(args, unsigned long long);               \
1301                 if (str + sizeof(type) <= end) {                        \
1302                         *(u32 *)str = *(u32 *)&value;                   \
1303                         *(u32 *)(str + 4) = *((u32 *)&value + 1);       \
1304                 }                                                       \
1305         } else {                                                        \
1306                 unsigned long value;                                    \
1307                 str = PTR_ALIGN(str, sizeof(type));                     \
1308                 value = va_arg(args, int);                              \
1309                 if (str + sizeof(type) <= end)                          \
1310                         *(typeof(type) *)str = (type)value;             \
1311         }                                                               \
1312         str += sizeof(type);                                            \
1313 } while (0)
1314
1315
1316         while (*fmt) {
1317                 read = format_decode(fmt, &spec);
1318
1319                 fmt += read;
1320
1321                 switch (spec.type) {
1322                 case FORMAT_TYPE_NONE:
1323                         break;
1324
1325                 case FORMAT_TYPE_WIDTH:
1326                 case FORMAT_TYPE_PRECISION:
1327                         save_arg(int);
1328                         break;
1329
1330                 case FORMAT_TYPE_CHAR:
1331                         save_arg(char);
1332                         break;
1333
1334                 case FORMAT_TYPE_STR: {
1335                         const char *save_str = va_arg(args, char *);
1336                         size_t len;
1337                         if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1338                                         || (unsigned long)save_str < PAGE_SIZE)
1339                                 save_str = "<NULL>";
1340                         len = strlen(save_str);
1341                         if (str + len + 1 < end)
1342                                 memcpy(str, save_str, len + 1);
1343                         str += len + 1;
1344                         break;
1345                 }
1346
1347                 case FORMAT_TYPE_PTR:
1348                         save_arg(void *);
1349                         /* skip all alphanumeric pointer suffixes */
1350                         while (isalnum(*fmt))
1351                                 fmt++;
1352                         break;
1353
1354                 case FORMAT_TYPE_PERCENT_CHAR:
1355                         break;
1356
1357                 case FORMAT_TYPE_INVALID:
1358                         break;
1359
1360                 case FORMAT_TYPE_NRCHARS: {
1361                         /* skip %n 's argument */
1362                         int qualifier = spec.qualifier;
1363                         void *skip_arg;
1364                         if (qualifier == 'l')
1365                                 skip_arg = va_arg(args, long *);
1366                         else if (qualifier == 'Z' || qualifier == 'z')
1367                                 skip_arg = va_arg(args, size_t *);
1368                         else
1369                                 skip_arg = va_arg(args, int *);
1370                         break;
1371                 }
1372
1373                 default:
1374                         switch (spec.type) {
1375
1376                         case FORMAT_TYPE_LONG_LONG:
1377                                 save_arg(long long);
1378                                 break;
1379                         case FORMAT_TYPE_ULONG:
1380                         case FORMAT_TYPE_LONG:
1381                                 save_arg(unsigned long);
1382                                 break;
1383                         case FORMAT_TYPE_SIZE_T:
1384                                 save_arg(size_t);
1385                                 break;
1386                         case FORMAT_TYPE_PTRDIFF:
1387                                 save_arg(ptrdiff_t);
1388                                 break;
1389                         case FORMAT_TYPE_UBYTE:
1390                         case FORMAT_TYPE_BYTE:
1391                                 save_arg(char);
1392                                 break;
1393                         case FORMAT_TYPE_USHORT:
1394                         case FORMAT_TYPE_SHORT:
1395                                 save_arg(short);
1396                                 break;
1397                         default:
1398                                 save_arg(int);
1399                         }
1400                 }
1401         }
1402         return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1403
1404 #undef save_arg
1405 }
1406 EXPORT_SYMBOL_GPL(vbin_printf);
1407
1408 /**
1409  * bstr_printf - Format a string from binary arguments and place it in a buffer
1410  * @buf: The buffer to place the result into
1411  * @size: The size of the buffer, including the trailing null space
1412  * @fmt: The format string to use
1413  * @bin_buf: Binary arguments for the format string
1414  *
1415  * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1416  * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1417  * a binary buffer that generated by vbin_printf.
1418  *
1419  * The format follows C99 vsnprintf, but has some extensions:
1420  * %pS output the name of a text symbol
1421  * %pF output the name of a function pointer with its offset
1422  * %pf output the name of a function pointer without its offset
1423  * %pR output the address range in a struct resource
1424  * %n is ignored
1425  *
1426  * The return value is the number of characters which would
1427  * be generated for the given input, excluding the trailing
1428  * '\0', as per ISO C99. If you want to have the exact
1429  * number of characters written into @buf as return value
1430  * (not including the trailing '\0'), use vscnprintf(). If the
1431  * return is greater than or equal to @size, the resulting
1432  * string is truncated.
1433  */
1434 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1435 {
1436         unsigned long long num;
1437         char *str, *end, c;
1438         const char *args = (const char *)bin_buf;
1439
1440         struct printf_spec spec = {0};
1441
1442         if (unlikely((int) size < 0)) {
1443                 /* There can be only one.. */
1444                 static char warn = 1;
1445                 WARN_ON(warn);
1446                 warn = 0;
1447                 return 0;
1448         }
1449
1450         str = buf;
1451         end = buf + size;
1452
1453 #define get_arg(type)                                                   \
1454 ({                                                                      \
1455         typeof(type) value;                                             \
1456         if (sizeof(type) == 8) {                                        \
1457                 args = PTR_ALIGN(args, sizeof(u32));                    \
1458                 *(u32 *)&value = *(u32 *)args;                          \
1459                 *((u32 *)&value + 1) = *(u32 *)(args + 4);              \
1460         } else {                                                        \
1461                 args = PTR_ALIGN(args, sizeof(type));                   \
1462                 value = *(typeof(type) *)args;                          \
1463         }                                                               \
1464         args += sizeof(type);                                           \
1465         value;                                                          \
1466 })
1467
1468         /* Make sure end is always >= buf */
1469         if (end < buf) {
1470                 end = ((void *)-1);
1471                 size = end - buf;
1472         }
1473
1474         while (*fmt) {
1475                 int read;
1476                 const char *old_fmt = fmt;
1477
1478                 read = format_decode(fmt, &spec);
1479
1480                 fmt += read;
1481
1482                 switch (spec.type) {
1483                 case FORMAT_TYPE_NONE: {
1484                         int copy = read;
1485                         if (str < end) {
1486                                 if (copy > end - str)
1487                                         copy = end - str;
1488                                 memcpy(str, old_fmt, copy);
1489                         }
1490                         str += read;
1491                         break;
1492                 }
1493
1494                 case FORMAT_TYPE_WIDTH:
1495                         spec.field_width = get_arg(int);
1496                         break;
1497
1498                 case FORMAT_TYPE_PRECISION:
1499                         spec.precision = get_arg(int);
1500                         break;
1501
1502                 case FORMAT_TYPE_CHAR:
1503                         if (!(spec.flags & LEFT)) {
1504                                 while (--spec.field_width > 0) {
1505                                         if (str < end)
1506                                                 *str = ' ';
1507                                         ++str;
1508                                 }
1509                         }
1510                         c = (unsigned char) get_arg(char);
1511                         if (str < end)
1512                                 *str = c;
1513                         ++str;
1514                         while (--spec.field_width > 0) {
1515                                 if (str < end)
1516                                         *str = ' ';
1517                                 ++str;
1518                         }
1519                         break;
1520
1521                 case FORMAT_TYPE_STR: {
1522                         const char *str_arg = args;
1523                         size_t len = strlen(str_arg);
1524                         args += len + 1;
1525                         str = string(str, end, (char *)str_arg, spec);
1526                         break;
1527                 }
1528
1529                 case FORMAT_TYPE_PTR:
1530                         str = pointer(fmt+1, str, end, get_arg(void *), spec);
1531                         while (isalnum(*fmt))
1532                                 fmt++;
1533                         break;
1534
1535                 case FORMAT_TYPE_PERCENT_CHAR:
1536                         if (str < end)
1537                                 *str = '%';
1538                         ++str;
1539                         break;
1540
1541                 case FORMAT_TYPE_INVALID:
1542                         if (str < end)
1543                                 *str = '%';
1544                         ++str;
1545                         break;
1546
1547                 case FORMAT_TYPE_NRCHARS:
1548                         /* skip */
1549                         break;
1550
1551                 default:
1552                         switch (spec.type) {
1553
1554                         case FORMAT_TYPE_LONG_LONG:
1555                                 num = get_arg(long long);
1556                                 break;
1557                         case FORMAT_TYPE_ULONG:
1558                                 num = get_arg(unsigned long);
1559                                 break;
1560                         case FORMAT_TYPE_LONG:
1561                                 num = get_arg(unsigned long);
1562                                 break;
1563                         case FORMAT_TYPE_SIZE_T:
1564                                 num = get_arg(size_t);
1565                                 break;
1566                         case FORMAT_TYPE_PTRDIFF:
1567                                 num = get_arg(ptrdiff_t);
1568                                 break;
1569                         case FORMAT_TYPE_UBYTE:
1570                                 num = get_arg(unsigned char);
1571                                 break;
1572                         case FORMAT_TYPE_BYTE:
1573                                 num = get_arg(signed char);
1574                                 break;
1575                         case FORMAT_TYPE_USHORT:
1576                                 num = get_arg(unsigned short);
1577                                 break;
1578                         case FORMAT_TYPE_SHORT:
1579                                 num = get_arg(short);
1580                                 break;
1581                         case FORMAT_TYPE_UINT:
1582                                 num = get_arg(unsigned int);
1583                                 break;
1584                         default:
1585                                 num = get_arg(int);
1586                         }
1587
1588                         str = number(str, end, num, spec);
1589                 }
1590         }
1591
1592         if (size > 0) {
1593                 if (str < end)
1594                         *str = '\0';
1595                 else
1596                         end[-1] = '\0';
1597         }
1598
1599 #undef get_arg
1600
1601         /* the trailing null byte doesn't count towards the total */
1602         return str - buf;
1603 }
1604 EXPORT_SYMBOL_GPL(bstr_printf);
1605
1606 /**
1607  * bprintf - Parse a format string and place args' binary value in a buffer
1608  * @bin_buf: The buffer to place args' binary value
1609  * @size: The size of the buffer(by words(32bits), not characters)
1610  * @fmt: The format string to use
1611  * @...: Arguments for the format string
1612  *
1613  * The function returns the number of words(u32) written
1614  * into @bin_buf.
1615  */
1616 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1617 {
1618         va_list args;
1619         int ret;
1620
1621         va_start(args, fmt);
1622         ret = vbin_printf(bin_buf, size, fmt, args);
1623         va_end(args);
1624         return ret;
1625 }
1626 EXPORT_SYMBOL_GPL(bprintf);
1627
1628 #endif /* CONFIG_BINARY_PRINTF */
1629
1630 /**
1631  * vsscanf - Unformat a buffer into a list of arguments
1632  * @buf:        input buffer
1633  * @fmt:        format of buffer
1634  * @args:       arguments
1635  */
1636 int vsscanf(const char * buf, const char * fmt, va_list args)
1637 {
1638         const char *str = buf;
1639         char *next;
1640         char digit;
1641         int num = 0;
1642         int qualifier;
1643         int base;
1644         int field_width;
1645         int is_sign = 0;
1646
1647         while(*fmt && *str) {
1648                 /* skip any white space in format */
1649                 /* white space in format matchs any amount of
1650                  * white space, including none, in the input.
1651                  */
1652                 if (isspace(*fmt)) {
1653                         while (isspace(*fmt))
1654                                 ++fmt;
1655                         while (isspace(*str))
1656                                 ++str;
1657                 }
1658
1659                 /* anything that is not a conversion must match exactly */
1660                 if (*fmt != '%' && *fmt) {
1661                         if (*fmt++ != *str++)
1662                                 break;
1663                         continue;
1664                 }
1665
1666                 if (!*fmt)
1667                         break;
1668                 ++fmt;
1669
1670                 /* skip this conversion.
1671                  * advance both strings to next white space
1672                  */
1673                 if (*fmt == '*') {
1674                         while (!isspace(*fmt) && *fmt)
1675                                 fmt++;
1676                         while (!isspace(*str) && *str)
1677                                 str++;
1678                         continue;
1679                 }
1680
1681                 /* get field width */
1682                 field_width = -1;
1683                 if (isdigit(*fmt))
1684                         field_width = skip_atoi(&fmt);
1685
1686                 /* get conversion qualifier */
1687                 qualifier = -1;
1688                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
1689                     *fmt == 'Z' || *fmt == 'z') {
1690                         qualifier = *fmt++;
1691                         if (unlikely(qualifier == *fmt)) {
1692                                 if (qualifier == 'h') {
1693                                         qualifier = 'H';
1694                                         fmt++;
1695                                 } else if (qualifier == 'l') {
1696                                         qualifier = 'L';
1697                                         fmt++;
1698                                 }
1699                         }
1700                 }
1701                 base = 10;
1702                 is_sign = 0;
1703
1704                 if (!*fmt || !*str)
1705                         break;
1706
1707                 switch(*fmt++) {
1708                 case 'c':
1709                 {
1710                         char *s = (char *) va_arg(args,char*);
1711                         if (field_width == -1)
1712                                 field_width = 1;
1713                         do {
1714                                 *s++ = *str++;
1715                         } while (--field_width > 0 && *str);
1716                         num++;
1717                 }
1718                 continue;
1719                 case 's':
1720                 {
1721                         char *s = (char *) va_arg(args, char *);
1722                         if(field_width == -1)
1723                                 field_width = INT_MAX;
1724                         /* first, skip leading white space in buffer */
1725                         while (isspace(*str))
1726                                 str++;
1727
1728                         /* now copy until next white space */
1729                         while (*str && !isspace(*str) && field_width--) {
1730                                 *s++ = *str++;
1731                         }
1732                         *s = '\0';
1733                         num++;
1734                 }
1735                 continue;
1736                 case 'n':
1737                         /* return number of characters read so far */
1738                 {
1739                         int *i = (int *)va_arg(args,int*);
1740                         *i = str - buf;
1741                 }
1742                 continue;
1743                 case 'o':
1744                         base = 8;
1745                         break;
1746                 case 'x':
1747                 case 'X':
1748                         base = 16;
1749                         break;
1750                 case 'i':
1751                         base = 0;
1752                 case 'd':
1753                         is_sign = 1;
1754                 case 'u':
1755                         break;
1756                 case '%':
1757                         /* looking for '%' in str */
1758                         if (*str++ != '%')
1759                                 return num;
1760                         continue;
1761                 default:
1762                         /* invalid format; stop here */
1763                         return num;
1764                 }
1765
1766                 /* have some sort of integer conversion.
1767                  * first, skip white space in buffer.
1768                  */
1769                 while (isspace(*str))
1770                         str++;
1771
1772                 digit = *str;
1773                 if (is_sign && digit == '-')
1774                         digit = *(str + 1);
1775
1776                 if (!digit
1777                     || (base == 16 && !isxdigit(digit))
1778                     || (base == 10 && !isdigit(digit))
1779                     || (base == 8 && (!isdigit(digit) || digit > '7'))
1780                     || (base == 0 && !isdigit(digit)))
1781                                 break;
1782
1783                 switch(qualifier) {
1784                 case 'H':       /* that's 'hh' in format */
1785                         if (is_sign) {
1786                                 signed char *s = (signed char *) va_arg(args,signed char *);
1787                                 *s = (signed char) simple_strtol(str,&next,base);
1788                         } else {
1789                                 unsigned char *s = (unsigned char *) va_arg(args, unsigned char *);
1790                                 *s = (unsigned char) simple_strtoul(str, &next, base);
1791                         }
1792                         break;
1793                 case 'h':
1794                         if (is_sign) {
1795                                 short *s = (short *) va_arg(args,short *);
1796                                 *s = (short) simple_strtol(str,&next,base);
1797                         } else {
1798                                 unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
1799                                 *s = (unsigned short) simple_strtoul(str, &next, base);
1800                         }
1801                         break;
1802                 case 'l':
1803                         if (is_sign) {
1804                                 long *l = (long *) va_arg(args,long *);
1805                                 *l = simple_strtol(str,&next,base);
1806                         } else {
1807                                 unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
1808                                 *l = simple_strtoul(str,&next,base);
1809                         }
1810                         break;
1811                 case 'L':
1812                         if (is_sign) {
1813                                 long long *l = (long long*) va_arg(args,long long *);
1814                                 *l = simple_strtoll(str,&next,base);
1815                         } else {
1816                                 unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
1817                                 *l = simple_strtoull(str,&next,base);
1818                         }
1819                         break;
1820                 case 'Z':
1821                 case 'z':
1822                 {
1823                         size_t *s = (size_t*) va_arg(args,size_t*);
1824                         *s = (size_t) simple_strtoul(str,&next,base);
1825                 }
1826                 break;
1827                 default:
1828                         if (is_sign) {
1829                                 int *i = (int *) va_arg(args, int*);
1830                                 *i = (int) simple_strtol(str,&next,base);
1831                         } else {
1832                                 unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
1833                                 *i = (unsigned int) simple_strtoul(str,&next,base);
1834                         }
1835                         break;
1836                 }
1837                 num++;
1838
1839                 if (!next)
1840                         break;
1841                 str = next;
1842         }
1843
1844         /*
1845          * Now we've come all the way through so either the input string or the
1846          * format ended. In the former case, there can be a %n at the current
1847          * position in the format that needs to be filled.
1848          */
1849         if (*fmt == '%' && *(fmt + 1) == 'n') {
1850                 int *p = (int *)va_arg(args, int *);
1851                 *p = str - buf;
1852         }
1853
1854         return num;
1855 }
1856 EXPORT_SYMBOL(vsscanf);
1857
1858 /**
1859  * sscanf - Unformat a buffer into a list of arguments
1860  * @buf:        input buffer
1861  * @fmt:        formatting of buffer
1862  * @...:        resulting arguments
1863  */
1864 int sscanf(const char * buf, const char * fmt, ...)
1865 {
1866         va_list args;
1867         int i;
1868
1869         va_start(args,fmt);
1870         i = vsscanf(buf,fmt,args);
1871         va_end(args);
1872         return i;
1873 }
1874 EXPORT_SYMBOL(sscanf);