util/cutils.c

   1 /*
   2  * Simple C functions to supplement the C library
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "qemu/osdep.h"
  25 #include "qemu-common.h"
  26 #include "qemu/host-utils.h"
  27 #include <math.h>
  28
  29 #include "qemu/sockets.h"
  30 #include "qemu/iov.h"
  31 #include "net/net.h"
  32 #include "qemu/cutils.h"
  33 #include "qemu/error-report.h"
  34
  35 void strpadcpy(char *buf, int buf_size, const char *str, char pad)
  36 {
  37     int len = qemu_strnlen(str, buf_size);
  38     memcpy(buf, str, len);
  39     memset(buf + len, pad, buf_size - len);
  40 }
  41
  42 void pstrcpy(char *buf, int buf_size, const char *str)
  43 {
  44     int c;
  45     char *q = buf;
  46
  47     if (buf_size <= 0)
  48         return;
  49
  50     for(;;) {
  51         c = *str++;
  52         if (c == 0 || q >= buf + buf_size - 1)
  53             break;
  54         *q++ = c;
  55     }
  56     *q = '\0';
  57 }
  58
  59 /* strcat and truncate. */
  60 char *pstrcat(char *buf, int buf_size, const char *s)
  61 {
  62     int len;
  63     len = strlen(buf);
  64     if (len < buf_size)
  65         pstrcpy(buf + len, buf_size - len, s);
  66     return buf;
  67 }
  68
  69 int strstart(const char *str, const char *val, const char **ptr)
  70 {
  71     const char *p, *q;
  72     p = str;
  73     q = val;
  74     while (*q != '\0') {
  75         if (*p != *q)
  76             return 0;
  77         p++;
  78         q++;
  79     }
  80     if (ptr)
  81         *ptr = p;
  82     return 1;
  83 }
  84
  85 int stristart(const char *str, const char *val, const char **ptr)
  86 {
  87     const char *p, *q;
  88     p = str;
  89     q = val;
  90     while (*q != '\0') {
  91         if (qemu_toupper(*p) != qemu_toupper(*q))
  92             return 0;
  93         p++;
  94         q++;
  95     }
  96     if (ptr)
  97         *ptr = p;
  98     return 1;
  99 }
 100
 101 /* XXX: use host strnlen if available ? */
 102 int qemu_strnlen(const char *s, int max_len)
 103 {
 104     int i;
 105
 106     for(i = 0; i < max_len; i++) {
 107         if (s[i] == '\0') {
 108             break;
 109         }
 110     }
 111     return i;
 112 }
 113
 114 char *qemu_strsep(char **input, const char *delim)
 115 {
 116     char *result = *input;
 117     if (result != NULL) {
 118         char *p;
 119
 120         for (p = result; *p != '\0'; p++) {
 121             if (strchr(delim, *p)) {
 122                 break;
 123             }
 124         }
 125         if (*p == '\0') {
 126             *input = NULL;
 127         } else {
 128             *p = '\0';
 129             *input = p + 1;
 130         }
 131     }
 132     return result;
 133 }
 134
 135 time_t mktimegm(struct tm *tm)
 136 {
 137     time_t t;
 138     int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
 139     if (m < 3) {
 140         m += 12;
 141         y--;
 142     }
 143     t = 86400ULL * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 +
 144                  y / 400 - 719469);
 145     t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
 146     return t;
 147 }
 148
 149 /*
 150  * Make sure data goes on disk, but if possible do not bother to
 151  * write out the inode just for timestamp updates.
 152  *
 153  * Unfortunately even in 2009 many operating systems do not support
 154  * fdatasync and have to fall back to fsync.
 155  */
 156 int qemu_fdatasync(int fd)
 157 {
 158 #ifdef CONFIG_FDATASYNC
 159     return fdatasync(fd);
 160 #else
 161     return fsync(fd);
 162 #endif
 163 }
 164
 165 #ifndef _WIN32
 166 /* Sets a specific flag */
 167 int fcntl_setfl(int fd, int flag)
 168 {
 169     int flags;
 170
 171     flags = fcntl(fd, F_GETFL);
 172     if (flags == -1)
 173         return -errno;
 174
 175     if (fcntl(fd, F_SETFL, flags | flag) == -1)
 176         return -errno;
 177
 178     return 0;
 179 }
 180 #endif
 181
 182 static int64_t suffix_mul(char suffix, int64_t unit)
 183 {
 184     switch (qemu_toupper(suffix)) {
 185     case 'B':
 186         return 1;
 187     case 'K':
 188         return unit;
 189     case 'M':
 190         return unit * unit;
 191     case 'G':
 192         return unit * unit * unit;
 193     case 'T':
 194         return unit * unit * unit * unit;
 195     case 'P':
 196         return unit * unit * unit * unit * unit;
 197     case 'E':
 198         return unit * unit * unit * unit * unit * unit;
 199     }
 200     return -1;
 201 }
 202
 203 /*
 204  * Convert string to bytes, allowing either B/b for bytes, K/k for KB,
 205  * M/m for MB, G/g for GB or T/t for TB. End pointer will be returned
 206  * in *end, if not NULL. Return -ERANGE on overflow, Return -EINVAL on
 207  * other error.
 208  */
 209 static int do_strtosz(const char *nptr, char **end,
 210                       const char default_suffix, int64_t unit,
 211                       uint64_t *result)
 212 {
 213     int retval;
 214     char *endptr;
 215     unsigned char c;
 216     int mul_required = 0;
 217     double val, mul, integral, fraction;
 218
 219     errno = 0;
 220     val = strtod(nptr, &endptr);
 221     if (isnan(val) || endptr == nptr || errno != 0) {
 222         retval = -EINVAL;
 223         goto out;
 224     }
 225     fraction = modf(val, &integral);
 226     if (fraction != 0) {
 227         mul_required = 1;
 228     }
 229     c = *endptr;
 230     mul = suffix_mul(c, unit);
 231     if (mul >= 0) {
 232         endptr++;
 233     } else {
 234         mul = suffix_mul(default_suffix, unit);
 235         assert(mul >= 0);
 236     }
 237     if (mul == 1 && mul_required) {
 238         retval = -EINVAL;
 239         goto out;
 240     }
 241     /*
 242      * Values >= 0xfffffffffffffc00 overflow uint64_t after their trip
 243      * through double (53 bits of precision).
 244      */
 245     if ((val * mul >= 0xfffffffffffffc00) || val < 0) {
 246         retval = -ERANGE;
 247         goto out;
 248     }
 249     *result = val * mul;
 250     retval = 0;
 251
 252 out:
 253     if (end) {
 254         *end = endptr;
 255     } else if (*endptr) {
 256         retval = -EINVAL;
 257     }
 258
 259     return retval;
 260 }
 261
 262 int qemu_strtosz(const char *nptr, char **end, uint64_t *result)
 263 {
 264     return do_strtosz(nptr, end, 'B', 1024, result);
 265 }
 266
 267 int qemu_strtosz_MiB(const char *nptr, char **end, uint64_t *result)
 268 {
 269     return do_strtosz(nptr, end, 'M', 1024, result);
 270 }
 271
 272 int qemu_strtosz_metric(const char *nptr, char **end, uint64_t *result)
 273 {
 274     return do_strtosz(nptr, end, 'B', 1000, result);
 275 }
 276
 277 /**
 278  * Helper function for error checking after strtol() and the like
 279  */
 280 static int check_strtox_error(const char *nptr, char *ep,
 281                               const char **endptr, int libc_errno)
 282 {
 283     assert(ep >= nptr);
 284     if (endptr) {
 285         *endptr = ep;
 286     }
 287
 288     /* Turn "no conversion" into an error */
 289     if (libc_errno == 0 && ep == nptr) {
 290         return -EINVAL;
 291     }
 292
 293     /* Fail when we're expected to consume the string, but didn't */
 294     if (!endptr && *ep) {
 295         return -EINVAL;
 296     }
 297
 298     return -libc_errno;
 299 }
 300
 301 /**
 302  * Convert string @nptr to an integer, and store it in @result.
 303  *
 304  * This is a wrapper around strtol() that is harder to misuse.
 305  * Semantics of @nptr, @endptr, @base match strtol() with differences
 306  * noted below.
 307  *
 308  * @nptr may be null, and no conversion is performed then.
 309  *
 310  * If no conversion is performed, store @nptr in *@endptr and return
 311  * -EINVAL.
 312  *
 313  * If @endptr is null, and the string isn't fully converted, return
 314  * -EINVAL.  This is the case when the pointer that would be stored in
 315  * a non-null @endptr points to a character other than '\0'.
 316  *
 317  * If the conversion overflows @result, store INT_MAX in @result,
 318  * and return -ERANGE.
 319  *
 320  * If the conversion underflows @result, store INT_MIN in @result,
 321  * and return -ERANGE.
 322  *
 323  * Else store the converted value in @result, and return zero.
 324  */
 325 int qemu_strtoi(const char *nptr, const char **endptr, int base,
 326                 int *result)
 327 {
 328     char *ep;
 329     long long lresult;
 330
 331     assert((unsigned) base <= 36 && base != 1);
 332     if (!nptr) {
 333         if (endptr) {
 334             *endptr = nptr;
 335         }
 336         return -EINVAL;
 337     }
 338
 339     errno = 0;
 340     lresult = strtoll(nptr, &ep, base);
 341     if (lresult < INT_MIN) {
 342         *result = INT_MIN;
 343         errno = ERANGE;
 344     } else if (lresult > INT_MAX) {
 345         *result = INT_MAX;
 346         errno = ERANGE;
 347     } else {
 348         *result = lresult;
 349     }
 350     return check_strtox_error(nptr, ep, endptr, errno);
 351 }
 352
 353 /**
 354  * Convert string @nptr to an unsigned integer, and store it in @result.
 355  *
 356  * This is a wrapper around strtoul() that is harder to misuse.
 357  * Semantics of @nptr, @endptr, @base match strtoul() with differences
 358  * noted below.
 359  *
 360  * @nptr may be null, and no conversion is performed then.
 361  *
 362  * If no conversion is performed, store @nptr in *@endptr and return
 363  * -EINVAL.
 364  *
 365  * If @endptr is null, and the string isn't fully converted, return
 366  * -EINVAL.  This is the case when the pointer that would be stored in
 367  * a non-null @endptr points to a character other than '\0'.
 368  *
 369  * If the conversion overflows @result, store UINT_MAX in @result,
 370  * and return -ERANGE.
 371  *
 372  * Else store the converted value in @result, and return zero.
 373  *
 374  * Note that a number with a leading minus sign gets converted without
 375  * the minus sign, checked for overflow (see above), then negated (in
 376  * @result's type).  This is exactly how strtoul() works.
 377  */
 378 int qemu_strtoui(const char *nptr, const char **endptr, int base,
 379                  unsigned int *result)
 380 {
 381     char *ep;
 382     long long lresult;
 383
 384     assert((unsigned) base <= 36 && base != 1);
 385     if (!nptr) {
 386         if (endptr) {
 387             *endptr = nptr;
 388         }
 389         return -EINVAL;
 390     }
 391
 392     errno = 0;
 393     lresult = strtoull(nptr, &ep, base);
 394
 395     /* Windows returns 1 for negative out-of-range values.  */
 396     if (errno == ERANGE) {
 397         *result = -1;
 398     } else {
 399         if (lresult > UINT_MAX) {
 400             *result = UINT_MAX;
 401             errno = ERANGE;
 402         } else if (lresult < INT_MIN) {
 403             *result = UINT_MAX;
 404             errno = ERANGE;
 405         } else {
 406             *result = lresult;
 407         }
 408     }
 409     return check_strtox_error(nptr, ep, endptr, errno);
 410 }
 411
 412 /**
 413  * Convert string @nptr to a long integer, and store it in @result.
 414  *
 415  * This is a wrapper around strtol() that is harder to misuse.
 416  * Semantics of @nptr, @endptr, @base match strtol() with differences
 417  * noted below.
 418  *
 419  * @nptr may be null, and no conversion is performed then.
 420  *
 421  * If no conversion is performed, store @nptr in *@endptr and return
 422  * -EINVAL.
 423  *
 424  * If @endptr is null, and the string isn't fully converted, return
 425  * -EINVAL.  This is the case when the pointer that would be stored in
 426  * a non-null @endptr points to a character other than '\0'.
 427  *
 428  * If the conversion overflows @result, store LONG_MAX in @result,
 429  * and return -ERANGE.
 430  *
 431  * If the conversion underflows @result, store LONG_MIN in @result,
 432  * and return -ERANGE.
 433  *
 434  * Else store the converted value in @result, and return zero.
 435  */
 436 int qemu_strtol(const char *nptr, const char **endptr, int base,
 437                 long *result)
 438 {
 439     char *ep;
 440
 441     assert((unsigned) base <= 36 && base != 1);
 442     if (!nptr) {
 443         if (endptr) {
 444             *endptr = nptr;
 445         }
 446         return -EINVAL;
 447     }
 448
 449     errno = 0;
 450     *result = strtol(nptr, &ep, base);
 451     return check_strtox_error(nptr, ep, endptr, errno);
 452 }
 453
 454 /**
 455  * Convert string @nptr to an unsigned long, and store it in @result.
 456  *
 457  * This is a wrapper around strtoul() that is harder to misuse.
 458  * Semantics of @nptr, @endptr, @base match strtoul() with differences
 459  * noted below.
 460  *
 461  * @nptr may be null, and no conversion is performed then.
 462  *
 463  * If no conversion is performed, store @nptr in *@endptr and return
 464  * -EINVAL.
 465  *
 466  * If @endptr is null, and the string isn't fully converted, return
 467  * -EINVAL.  This is the case when the pointer that would be stored in
 468  * a non-null @endptr points to a character other than '\0'.
 469  *
 470  * If the conversion overflows @result, store ULONG_MAX in @result,
 471  * and return -ERANGE.
 472  *
 473  * Else store the converted value in @result, and return zero.
 474  *
 475  * Note that a number with a leading minus sign gets converted without
 476  * the minus sign, checked for overflow (see above), then negated (in
 477  * @result's type).  This is exactly how strtoul() works.
 478  */
 479 int qemu_strtoul(const char *nptr, const char **endptr, int base,
 480                  unsigned long *result)
 481 {
 482     char *ep;
 483
 484     assert((unsigned) base <= 36 && base != 1);
 485     if (!nptr) {
 486         if (endptr) {
 487             *endptr = nptr;
 488         }
 489         return -EINVAL;
 490     }
 491
 492     errno = 0;
 493     *result = strtoul(nptr, &ep, base);
 494     /* Windows returns 1 for negative out-of-range values.  */
 495     if (errno == ERANGE) {
 496         *result = -1;
 497     }
 498     return check_strtox_error(nptr, ep, endptr, errno);
 499 }
 500
 501 /**
 502  * Convert string @nptr to an int64_t.
 503  *
 504  * Works like qemu_strtol(), except it stores INT64_MAX on overflow,
 505  * and INT_MIN on underflow.
 506  */
 507 int qemu_strtoi64(const char *nptr, const char **endptr, int base,
 508                  int64_t *result)
 509 {
 510     char *ep;
 511
 512     assert((unsigned) base <= 36 && base != 1);
 513     if (!nptr) {
 514         if (endptr) {
 515             *endptr = nptr;
 516         }
 517         return -EINVAL;
 518     }
 519
 520     errno = 0;
 521     /* FIXME This assumes int64_t is long long */
 522     *result = strtoll(nptr, &ep, base);
 523     return check_strtox_error(nptr, ep, endptr, errno);
 524 }
 525
 526 /**
 527  * Convert string @nptr to an uint64_t.
 528  *
 529  * Works like qemu_strtoul(), except it stores UINT64_MAX on overflow.
 530  */
 531 int qemu_strtou64(const char *nptr, const char **endptr, int base,
 532                   uint64_t *result)
 533 {
 534     char *ep;
 535
 536     assert((unsigned) base <= 36 && base != 1);
 537     if (!nptr) {
 538         if (endptr) {
 539             *endptr = nptr;
 540         }
 541         return -EINVAL;
 542     }
 543
 544     errno = 0;
 545     /* FIXME This assumes uint64_t is unsigned long long */
 546     *result = strtoull(nptr, &ep, base);
 547     /* Windows returns 1 for negative out-of-range values.  */
 548     if (errno == ERANGE) {
 549         *result = -1;
 550     }
 551     return check_strtox_error(nptr, ep, endptr, errno);
 552 }
 553
 554 /**
 555  * Searches for the first occurrence of 'c' in 's', and returns a pointer
 556  * to the trailing null byte if none was found.
 557  */
 558 #ifndef HAVE_STRCHRNUL
 559 const char *qemu_strchrnul(const char *s, int c)
 560 {
 561     const char *e = strchr(s, c);
 562     if (!e) {
 563         e = s + strlen(s);
 564     }
 565     return e;
 566 }
 567 #endif
 568
 569 /**
 570  * parse_uint:
 571  *
 572  * @s: String to parse
 573  * @value: Destination for parsed integer value
 574  * @endptr: Destination for pointer to first character not consumed
 575  * @base: integer base, between 2 and 36 inclusive, or 0
 576  *
 577  * Parse unsigned integer
 578  *
 579  * Parsed syntax is like strtoull()'s: arbitrary whitespace, a single optional
 580  * '+' or '-', an optional "0x" if @base is 0 or 16, one or more digits.
 581  *
 582  * If @s is null, or @base is invalid, or @s doesn't start with an
 583  * integer in the syntax above, set *@value to 0, *@endptr to @s, and
 584  * return -EINVAL.
 585  *
 586  * Set *@endptr to point right beyond the parsed integer (even if the integer
 587  * overflows or is negative, all digits will be parsed and *@endptr will
 588  * point right beyond them).
 589  *
 590  * If the integer is negative, set *@value to 0, and return -ERANGE.
 591  *
 592  * If the integer overflows unsigned long long, set *@value to
 593  * ULLONG_MAX, and return -ERANGE.
 594  *
 595  * Else, set *@value to the parsed integer, and return 0.
 596  */
 597 int parse_uint(const char *s, unsigned long long *value, char **endptr,
 598                int base)
 599 {
 600     int r = 0;
 601     char *endp = (char *)s;
 602     unsigned long long val = 0;
 603
 604     assert((unsigned) base <= 36 && base != 1);
 605     if (!s) {
 606         r = -EINVAL;
 607         goto out;
 608     }
 609
 610     errno = 0;
 611     val = strtoull(s, &endp, base);
 612     if (errno) {
 613         r = -errno;
 614         goto out;
 615     }
 616
 617     if (endp == s) {
 618         r = -EINVAL;
 619         goto out;
 620     }
 621
 622     /* make sure we reject negative numbers: */
 623     while (isspace((unsigned char)*s)) {
 624         s++;
 625     }
 626     if (*s == '-') {
 627         val = 0;
 628         r = -ERANGE;
 629         goto out;
 630     }
 631
 632 out:
 633     *value = val;
 634     *endptr = endp;
 635     return r;
 636 }
 637
 638 /**
 639  * parse_uint_full:
 640  *
 641  * @s: String to parse
 642  * @value: Destination for parsed integer value
 643  * @base: integer base, between 2 and 36 inclusive, or 0
 644  *
 645  * Parse unsigned integer from entire string
 646  *
 647  * Have the same behavior of parse_uint(), but with an additional check
 648  * for additional data after the parsed number. If extra characters are present
 649  * after the parsed number, the function will return -EINVAL, and *@v will
 650  * be set to 0.
 651  */
 652 int parse_uint_full(const char *s, unsigned long long *value, int base)
 653 {
 654     char *endp;
 655     int r;
 656
 657     r = parse_uint(s, value, &endp, base);
 658     if (r < 0) {
 659         return r;
 660     }
 661     if (*endp) {
 662         *value = 0;
 663         return -EINVAL;
 664     }
 665
 666     return 0;
 667 }
 668
 669 int qemu_parse_fd(const char *param)
 670 {
 671     long fd;
 672     char *endptr;
 673
 674     errno = 0;
 675     fd = strtol(param, &endptr, 10);
 676     if (param == endptr /* no conversion performed */                    ||
 677         errno != 0      /* not representable as long; possibly others */ ||
 678         *endptr != '\0' /* final string not empty */                     ||
 679         fd < 0          /* invalid as file descriptor */                 ||
 680         fd > INT_MAX    /* not representable as int */) {
 681         return -1;
 682     }
 683     return fd;
 684 }
 685
 686 /*
 687  * Implementation of  ULEB128 (http://en.wikipedia.org/wiki/LEB128)
 688  * Input is limited to 14-bit numbers
 689  */
 690 int uleb128_encode_small(uint8_t *out, uint32_t n)
 691 {
 692     g_assert(n <= 0x3fff);
 693     if (n < 0x80) {
 694         *out++ = n;
 695         return 1;
 696     } else {
 697         *out++ = (n & 0x7f) | 0x80;
 698         *out++ = n >> 7;
 699         return 2;
 700     }
 701 }
 702
 703 int uleb128_decode_small(const uint8_t *in, uint32_t *n)
 704 {
 705     if (!(*in & 0x80)) {
 706         *n = *in++;
 707         return 1;
 708     } else {
 709         *n = *in++ & 0x7f;
 710         /* we exceed 14 bit number */
 711         if (*in & 0x80) {
 712             return -1;
 713         }
 714         *n |= *in++ << 7;
 715         return 2;
 716     }
 717 }
 718
 719 /*
 720  * helper to parse debug environment variables
 721  */
 722 int parse_debug_env(const char *name, int max, int initial)
 723 {
 724     char *debug_env = getenv(name);
 725     char *inv = NULL;
 726     long debug;
 727
 728     if (!debug_env) {
 729         return initial;
 730     }
 731     errno = 0;
 732     debug = strtol(debug_env, &inv, 10);
 733     if (inv == debug_env) {
 734         return initial;
 735     }
 736     if (debug < 0 || debug > max || errno != 0) {
 737         warn_report("%s not in [0, %d]", name, max);
 738         return initial;
 739     }
 740     return debug;
 741 }
 742
 743 /*
 744  * Helper to print ethernet mac address
 745  */
 746 const char *qemu_ether_ntoa(const MACAddr *mac)
 747 {
 748     static char ret[18];
 749
 750     snprintf(ret, sizeof(ret), "%02x:%02x:%02x:%02x:%02x:%02x",
 751              mac->a[0], mac->a[1], mac->a[2], mac->a[3], mac->a[4], mac->a[5]);
 752
 753     return ret;
 754 }
 755
 756 /*
 757  * Return human readable string for size @val.
 758  * @val can be anything that uint64_t allows (no more than "16 EiB").
 759  * Use IEC binary units like KiB, MiB, and so forth.
 760  * Caller is responsible for passing it to g_free().
 761  */
 762 char *size_to_str(uint64_t val)
 763 {
 764     static const char *suffixes[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
 765     unsigned long div;
 766     int i;
 767
 768     /*
 769      * The exponent (returned in i) minus one gives us
 770      * floor(log2(val * 1024 / 1000).  The correction makes us
 771      * switch to the higher power when the integer part is >= 1000.
 772      * (see e41b509d68afb1f for more info)
 773      */
 774     frexp(val / (1000.0 / 1024.0), &i);
 775     i = (i - 1) / 10;
 776     div = 1ULL << (i * 10);
 777
 778     return g_strdup_printf("%0.3g %sB", (double)val / div, suffixes[i]);
 779 }
 780
 781 int qemu_pstrcmp0(const char **str1, const char **str2)
 782 {
 783     return g_strcmp0(*str1, *str2);
 784 }