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qemu/util/cutils.c
Akihiko Odaki 401766e043 cutils: Fix get_relocated_path on Windows 
get_relocated_path() did not have error handling for PathCchSkipRoot()
because a path given to get_relocated_path() was expected to be a valid
path containing a drive letter or UNC server/share path elements on
Windows, but sometimes it turned out otherwise.

The paths passed to get_relocated_path() are defined by macros generated
by Meson. Meson in turn uses a prefix given by the configure script to
generate them. For Windows, the script passes /qemu as a prefix to
Meson by default.

As documented in docs/about/build-platforms.rst, typically MSYS2 is used
for the build system, but it is also possible to use Linux as well. When
MSYS2 is used, its Bash variant recognizes /qemu as a MSYS2 path, and
converts it to a Windows path, adding the MSYS2 prefix including a drive
letter or UNC server/share path elements. Such a conversion does not
happen on a shell on Linux however, and /qemu will be passed as is in
the case.

Implement a proper error handling of PathCchSkipRoot() in
get_relocated_path() so that it can handle a path without a drive letter
or UNC server/share path elements.

Reported-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231005064726.6945-1-akihiko.odaki@daynix.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2023-10-20 14:46:06 +02:00

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/*
* Simple C functions to supplement the C library
*
* Copyright (c) 2006 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
#include <math.h>
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#include <sys/user.h>
#endif
#ifdef __NetBSD__
#include <sys/sysctl.h>
#endif
#ifdef __HAIKU__
#include <kernel/image.h>
#endif
#ifdef __APPLE__
#include <mach-o/dyld.h>
#endif
#ifdef G_OS_WIN32
#include <pathcch.h>
#include <wchar.h>
#endif
#include "qemu/ctype.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
void strpadcpy(char *buf, int buf_size, const char *str, char pad)
{
int len = qemu_strnlen(str, buf_size);
memcpy(buf, str, len);
memset(buf + len, pad, buf_size - len);
}
void pstrcpy(char *buf, int buf_size, const char *str)
{
int c;
char *q = buf;
if (buf_size <= 0)
return;
for(;;) {
c = *str++;
if (c == 0 || q >= buf + buf_size - 1)
break;
*q++ = c;
}
*q = '\0';
}
/* strcat and truncate. */
char *pstrcat(char *buf, int buf_size, const char *s)
{
int len;
len = strlen(buf);
if (len < buf_size)
pstrcpy(buf + len, buf_size - len, s);
return buf;
}
int strstart(const char *str, const char *val, const char **ptr)
{
const char *p, *q;
p = str;
q = val;
while (*q != '\0') {
if (*p != *q)
return 0;
p++;
q++;
}
if (ptr)
*ptr = p;
return 1;
}
int stristart(const char *str, const char *val, const char **ptr)
{
const char *p, *q;
p = str;
q = val;
while (*q != '\0') {
if (qemu_toupper(*p) != qemu_toupper(*q))
return 0;
p++;
q++;
}
if (ptr)
*ptr = p;
return 1;
}
/* XXX: use host strnlen if available ? */
int qemu_strnlen(const char *s, int max_len)
{
int i;
for(i = 0; i < max_len; i++) {
if (s[i] == '\0') {
break;
}
}
return i;
}
char *qemu_strsep(char **input, const char *delim)
{
char *result = *input;
if (result != NULL) {
char *p;
for (p = result; *p != '\0'; p++) {
if (strchr(delim, *p)) {
break;
}
}
if (*p == '\0') {
*input = NULL;
} else {
*p = '\0';
*input = p + 1;
}
}
return result;
}
time_t mktimegm(struct tm *tm)
{
time_t t;
int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
if (m < 3) {
m += 12;
y--;
}
t = 86400ULL * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 +
y / 400 - 719469);
t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
return t;
}
static int64_t suffix_mul(char suffix, int64_t unit)
{
switch (qemu_toupper(suffix)) {
case 'B':
return 1;
case 'K':
return unit;
case 'M':
return unit * unit;
case 'G':
return unit * unit * unit;
case 'T':
return unit * unit * unit * unit;
case 'P':
return unit * unit * unit * unit * unit;
case 'E':
return unit * unit * unit * unit * unit * unit;
}
return -1;
}
/*
* Convert size string to bytes.
*
* The size parsing supports the following syntaxes
* - 12345 - decimal, scale determined by @default_suffix and @unit
* - 12345{bBkKmMgGtTpPeE} - decimal, scale determined by suffix and @unit
* - 12345.678{kKmMgGtTpPeE} - decimal, scale determined by suffix, and
* fractional portion is truncated to byte, either side of . may be empty
* - 0x7fEE - hexadecimal, unit determined by @default_suffix
*
* The following are intentionally not supported
* - hex with scaling suffix, such as 0x20M or 0x1p3 (both fail with
* -EINVAL), while 0x1b is 27 (not 1 with byte scale)
* - octal, such as 08 (parsed as decimal instead)
* - binary, such as 0b1000 (parsed as 0b with trailing garbage "1000")
* - fractional hex, such as 0x1.8 (parsed as 0 with trailing garbage "x1.8")
* - negative values, including -0 (fail with -ERANGE)
* - floating point exponents, such as 1e3 (parsed as 1e with trailing
* garbage "3") or 0x1p3 (rejected as hex with scaling suffix)
* - non-finite values, such as inf or NaN (fail with -EINVAL)
*
* The end pointer will be returned in *end, if not NULL. If there is
* no fraction, the input can be decimal or hexadecimal; if there is a
* non-zero fraction, then the input must be decimal and there must be
* a suffix (possibly by @default_suffix) larger than Byte, and the
* fractional portion may suffer from precision loss or rounding. The
* input must be positive.
*
* Return -ERANGE on overflow (with *@end advanced), and -EINVAL on
* other error (with *@end at @nptr). Unlike strtoull, *@result is
* set to 0 on all errors, as returning UINT64_MAX on overflow is less
* likely to be usable as a size.
*/
static int do_strtosz(const char *nptr, const char **end,
const char default_suffix, int64_t unit,
uint64_t *result)
{
int retval;
const char *endptr;
unsigned char c;
uint64_t val = 0, valf = 0;
int64_t mul;
/* Parse integral portion as decimal. */
retval = parse_uint(nptr, &endptr, 10, &val);
if (retval == -ERANGE || !nptr) {
goto out;
}
if (retval == 0 && val == 0 && (*endptr == 'x' || *endptr == 'X')) {
/* Input looks like hex; reparse, and insist on no fraction or suffix. */
retval = qemu_strtou64(nptr, &endptr, 16, &val);
if (retval) {
goto out;
}
if (*endptr == '.' || suffix_mul(*endptr, unit) > 0) {
endptr = nptr;
retval = -EINVAL;
goto out;
}
} else if (*endptr == '.' || (endptr == nptr && strchr(nptr, '.'))) {
/*
* Input looks like a fraction. Make sure even 1.k works
* without fractional digits. strtod tries to treat 'e' as an
* exponent, but we want to treat it as a scaling suffix;
* doing this requires modifying a copy of the fraction.
*/
double fraction = 0.0;
if (retval == 0 && *endptr == '.' && !isdigit(endptr[1])) {
/* If we got here, we parsed at least one digit already. */
endptr++;
} else {
char *e;
const char *tail;
g_autofree char *copy = g_strdup(endptr);
e = strchr(copy, 'e');
if (e) {
*e = '\0';
}
e = strchr(copy, 'E');
if (e) {
*e = '\0';
}
/*
* If this is a floating point, we are guaranteed that '.'
* appears before any possible digits in copy. If it is
* not a floating point, strtod will fail. Either way,
* there is now no exponent in copy, so if it parses, we
* know 0.0 <= abs(result) <= 1.0 (after rounding), and
* ERANGE is only possible on underflow which is okay.
*/
retval = qemu_strtod_finite(copy, &tail, &fraction);
endptr += tail - copy;
if (signbit(fraction)) {
retval = -ERANGE;
goto out;
}
}
/* Extract into a 64-bit fixed-point fraction. */
if (fraction == 1.0) {
if (val == UINT64_MAX) {
retval = -ERANGE;
goto out;
}
val++;
} else if (retval == -ERANGE) {
/* See comments above about underflow */
valf = 1;
retval = 0;
} else {
/* We want non-zero valf for any non-zero fraction */
valf = (uint64_t)(fraction * 0x1p64);
if (valf == 0 && fraction > 0.0) {
valf = 1;
}
}
}
if (retval) {
goto out;
}
c = *endptr;
mul = suffix_mul(c, unit);
if (mul > 0) {
endptr++;
} else {
mul = suffix_mul(default_suffix, unit);
assert(mul > 0);
}
if (mul == 1) {
/* When a fraction is present, a scale is required. */
if (valf != 0) {
endptr = nptr;
retval = -EINVAL;
goto out;
}
} else {
uint64_t valh, tmp;
/* Compute exact result: 64.64 x 64.0 -> 128.64 fixed point */
mulu64(&val, &valh, val, mul);
mulu64(&valf, &tmp, valf, mul);
val += tmp;
valh += val < tmp;
/* Round 0.5 upward. */
tmp = valf >> 63;
val += tmp;
valh += val < tmp;
/* Report overflow. */
if (valh != 0) {
retval = -ERANGE;
goto out;
}
}
retval = 0;
out:
if (end) {
*end = endptr;
} else if (nptr && *endptr) {
retval = -EINVAL;
}
if (retval == 0) {
*result = val;
} else {
*result = 0;
if (end && retval == -EINVAL) {
*end = nptr;
}
}
return retval;
}
int qemu_strtosz(const char *nptr, const char **end, uint64_t *result)
{
return do_strtosz(nptr, end, 'B', 1024, result);
}
int qemu_strtosz_MiB(const char *nptr, const char **end, uint64_t *result)
{
return do_strtosz(nptr, end, 'M', 1024, result);
}
int qemu_strtosz_metric(const char *nptr, const char **end, uint64_t *result)
{
return do_strtosz(nptr, end, 'B', 1000, result);
}
/**
* Helper function for error checking after strtol() and the like
*/
static int check_strtox_error(const char *nptr, char *ep,
const char **endptr, bool check_zero,
int libc_errno)
{
assert(ep >= nptr);
/* Windows has a bug in that it fails to parse 0 from "0x" in base 16 */
if (check_zero && ep == nptr && libc_errno == 0) {
char *tmp;
errno = 0;
if (strtol(nptr, &tmp, 10) == 0 && errno == 0 &&
(*tmp == 'x' || *tmp == 'X')) {
ep = tmp;
}
}
if (endptr) {
*endptr = ep;
}
/* Turn "no conversion" into an error */
if (libc_errno == 0 && ep == nptr) {
return -EINVAL;
}
/* Fail when we're expected to consume the string, but didn't */
if (!endptr && *ep) {
return -EINVAL;
}
return -libc_errno;
}
/**
* Convert string @nptr to an integer, and store it in @result.
*
* This is a wrapper around strtol() that is harder to misuse.
* Semantics of @nptr, @endptr, @base match strtol() with differences
* noted below.
*
* @nptr may be null, and no conversion is performed then.
*
* If no conversion is performed, store @nptr in *@endptr, 0 in
* @result, and return -EINVAL.
*
* If @endptr is null, and the string isn't fully converted, return
* -EINVAL with @result set to the parsed value. This is the case
* when the pointer that would be stored in a non-null @endptr points
* to a character other than '\0'.
*
* If the conversion overflows @result, store INT_MAX in @result,
* and return -ERANGE.
*
* If the conversion underflows @result, store INT_MIN in @result,
* and return -ERANGE.
*
* Else store the converted value in @result, and return zero.
*
* This matches the behavior of strtol() on 32-bit platforms, even on
* platforms where long is 64-bits.
*/
int qemu_strtoi(const char *nptr, const char **endptr, int base,
int *result)
{
char *ep;
long long lresult;
assert((unsigned) base <= 36 && base != 1);
if (!nptr) {
*result = 0;
if (endptr) {
*endptr = nptr;
}
return -EINVAL;
}
errno = 0;
lresult = strtoll(nptr, &ep, base);
if (lresult < INT_MIN) {
*result = INT_MIN;
errno = ERANGE;
} else if (lresult > INT_MAX) {
*result = INT_MAX;
errno = ERANGE;
} else {
*result = lresult;
}
return check_strtox_error(nptr, ep, endptr, lresult == 0, errno);
}
/**
* Convert string @nptr to an unsigned integer, and store it in @result.
*
* This is a wrapper around strtoul() that is harder to misuse.
* Semantics of @nptr, @endptr, @base match strtoul() with differences
* noted below.
*
* @nptr may be null, and no conversion is performed then.
*
* If no conversion is performed, store @nptr in *@endptr, 0 in
* @result, and return -EINVAL.
*
* If @endptr is null, and the string isn't fully converted, return
* -EINVAL with @result set to the parsed value. This is the case
* when the pointer that would be stored in a non-null @endptr points
* to a character other than '\0'.
*
* If the conversion overflows @result, store UINT_MAX in @result,
* and return -ERANGE.
*
* Else store the converted value in @result, and return zero.
*
* Note that a number with a leading minus sign gets converted without
* the minus sign, checked for overflow (see above), then negated (in
* @result's type). This matches the behavior of strtoul() on 32-bit
* platforms, even on platforms where long is 64-bits.
*/
int qemu_strtoui(const char *nptr, const char **endptr, int base,
unsigned int *result)
{
char *ep;
unsigned long long lresult;
bool neg;
assert((unsigned) base <= 36 && base != 1);
if (!nptr) {
*result = 0;
if (endptr) {
*endptr = nptr;
}
return -EINVAL;
}
errno = 0;
lresult = strtoull(nptr, &ep, base);
/* Windows returns 1 for negative out-of-range values. */
if (errno == ERANGE) {
*result = -1;
} else {
/*
* Note that platforms with 32-bit strtoul only accept input
* in the range [-4294967295, 4294967295]; but we used 64-bit
* strtoull which wraps -18446744073709551615 to 1 instead of
* declaring overflow. So we must check if '-' was parsed,
* and if so, undo the negation before doing our bounds check.
*/
neg = memchr(nptr, '-', ep - nptr) != NULL;
if (neg) {
lresult = -lresult;
}
if (lresult > UINT_MAX) {
*result = UINT_MAX;
errno = ERANGE;
} else {
*result = neg ? -lresult : lresult;
}
}
return check_strtox_error(nptr, ep, endptr, lresult == 0, errno);
}
/**
* Convert string @nptr to a long integer, and store it in @result.
*
* This is a wrapper around strtol() that is harder to misuse.
* Semantics of @nptr, @endptr, @base match strtol() with differences
* noted below.
*
* @nptr may be null, and no conversion is performed then.
*
* If no conversion is performed, store @nptr in *@endptr, 0 in
* @result, and return -EINVAL.
*
* If @endptr is null, and the string isn't fully converted, return
* -EINVAL with @result set to the parsed value. This is the case
* when the pointer that would be stored in a non-null @endptr points
* to a character other than '\0'.
*
* If the conversion overflows @result, store LONG_MAX in @result,
* and return -ERANGE.
*
* If the conversion underflows @result, store LONG_MIN in @result,
* and return -ERANGE.
*
* Else store the converted value in @result, and return zero.
*/
int qemu_strtol(const char *nptr, const char **endptr, int base,
long *result)
{
char *ep;
assert((unsigned) base <= 36 && base != 1);
if (!nptr) {
*result = 0;
if (endptr) {
*endptr = nptr;
}
return -EINVAL;
}
errno = 0;
*result = strtol(nptr, &ep, base);
return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
}
/**
* Convert string @nptr to an unsigned long, and store it in @result.
*
* This is a wrapper around strtoul() that is harder to misuse.
* Semantics of @nptr, @endptr, @base match strtoul() with differences
* noted below.
*
* @nptr may be null, and no conversion is performed then.
*
* If no conversion is performed, store @nptr in *@endptr, 0 in
* @result, and return -EINVAL.
*
* If @endptr is null, and the string isn't fully converted, return
* -EINVAL with @result set to the parsed value. This is the case
* when the pointer that would be stored in a non-null @endptr points
* to a character other than '\0'.
*
* If the conversion overflows @result, store ULONG_MAX in @result,
* and return -ERANGE.
*
* Else store the converted value in @result, and return zero.
*
* Note that a number with a leading minus sign gets converted without
* the minus sign, checked for overflow (see above), then negated (in
* @result's type). This is exactly how strtoul() works.
*/
int qemu_strtoul(const char *nptr, const char **endptr, int base,
unsigned long *result)
{
char *ep;
assert((unsigned) base <= 36 && base != 1);
if (!nptr) {
*result = 0;
if (endptr) {
*endptr = nptr;
}
return -EINVAL;
}
errno = 0;
*result = strtoul(nptr, &ep, base);
/* Windows returns 1 for negative out-of-range values. */
if (errno == ERANGE) {
*result = -1;
}
return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
}
/**
* Convert string @nptr to an int64_t.
*
* Works like qemu_strtol(), except it stores INT64_MAX on overflow,
* and INT64_MIN on underflow.
*/
int qemu_strtoi64(const char *nptr, const char **endptr, int base,
int64_t *result)
{
char *ep;
assert((unsigned) base <= 36 && base != 1);
if (!nptr) {
*result = 0;
if (endptr) {
*endptr = nptr;
}
return -EINVAL;
}
/* This assumes int64_t is long long TODO relax */
QEMU_BUILD_BUG_ON(sizeof(int64_t) != sizeof(long long));
errno = 0;
*result = strtoll(nptr, &ep, base);
return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
}
/**
* Convert string @nptr to an uint64_t.
*
* Works like qemu_strtoul(), except it stores UINT64_MAX on overflow.
* (If you want to prohibit negative numbers that wrap around to
* positive, use parse_uint()).
*/
int qemu_strtou64(const char *nptr, const char **endptr, int base,
uint64_t *result)
{
char *ep;
assert((unsigned) base <= 36 && base != 1);
if (!nptr) {
*result = 0;
if (endptr) {
*endptr = nptr;
}
return -EINVAL;
}
/* This assumes uint64_t is unsigned long long TODO relax */
QEMU_BUILD_BUG_ON(sizeof(uint64_t) != sizeof(unsigned long long));
errno = 0;
*result = strtoull(nptr, &ep, base);
/* Windows returns 1 for negative out-of-range values. */
if (errno == ERANGE) {
*result = -1;
}
return check_strtox_error(nptr, ep, endptr, *result == 0, errno);
}
/**
* Convert string @nptr to a double.
*
* This is a wrapper around strtod() that is harder to misuse.
* Semantics of @nptr and @endptr match strtod() with differences
* noted below.
*
* @nptr may be null, and no conversion is performed then.
*
* If no conversion is performed, store @nptr in *@endptr, +0.0 in
* @result, and return -EINVAL.
*
* If @endptr is null, and the string isn't fully converted, return
* -EINVAL with @result set to the parsed value. This is the case
* when the pointer that would be stored in a non-null @endptr points
* to a character other than '\0'.
*
* If the conversion overflows, store +/-HUGE_VAL in @result, depending
* on the sign, and return -ERANGE.
*
* If the conversion underflows, store +/-0.0 in @result, depending on the
* sign, and return -ERANGE.
*
* Else store the converted value in @result, and return zero.
*/
int qemu_strtod(const char *nptr, const char **endptr, double *result)
{
char *ep;
if (!nptr) {
*result = 0.0;
if (endptr) {
*endptr = nptr;
}
return -EINVAL;
}
errno = 0;
*result = strtod(nptr, &ep);
return check_strtox_error(nptr, ep, endptr, false, errno);
}
/**
* Convert string @nptr to a finite double.
*
* Works like qemu_strtod(), except that "NaN", "inf", and strings
* that cause ERANGE overflow errors are rejected with -EINVAL as if
* no conversion is performed, storing 0.0 into @result regardless of
* any sign. -ERANGE failures for underflow still preserve the parsed
* sign.
*/
int qemu_strtod_finite(const char *nptr, const char **endptr, double *result)
{
const char *tmp;
int ret;
ret = qemu_strtod(nptr, &tmp, result);
if (!isfinite(*result)) {
if (endptr) {
*endptr = nptr;
}
*result = 0.0;
ret = -EINVAL;
} else if (endptr) {
*endptr = tmp;
} else if (*tmp) {
ret = -EINVAL;
}
return ret;
}
/**
* Searches for the first occurrence of 'c' in 's', and returns a pointer
* to the trailing null byte if none was found.
*/
#ifndef HAVE_STRCHRNUL
const char *qemu_strchrnul(const char *s, int c)
{
const char *e = strchr(s, c);
if (!e) {
e = s + strlen(s);
}
return e;
}
#endif
/**
* parse_uint:
*
* @s: String to parse
* @endptr: Destination for pointer to first character not consumed
* @base: integer base, between 2 and 36 inclusive, or 0
* @value: Destination for parsed integer value
*
* Parse unsigned integer
*
* Parsed syntax is like strtoull()'s: arbitrary whitespace, a single optional
* '+' or '-', an optional "0x" if @base is 0 or 16, one or more digits.
*
* If @s is null, or @s doesn't start with an integer in the syntax
* above, set *@value to 0, *@endptr to @s, and return -EINVAL.
*
* Set *@endptr to point right beyond the parsed integer (even if the integer
* overflows or is negative, all digits will be parsed and *@endptr will
* point right beyond them). If @endptr is %NULL, any trailing character
* instead causes a result of -EINVAL with *@value of 0.
*
* If the integer is negative, set *@value to 0, and return -ERANGE.
* (If you want to allow negative numbers that wrap around within
* bounds, use qemu_strtou64()).
*
* If the integer overflows unsigned long long, set *@value to
* ULLONG_MAX, and return -ERANGE.
*
* Else, set *@value to the parsed integer, and return 0.
*/
int parse_uint(const char *s, const char **endptr, int base, uint64_t *value)
{
int r = 0;
char *endp = (char *)s;
unsigned long long val = 0;
assert((unsigned) base <= 36 && base != 1);
if (!s) {
r = -EINVAL;
goto out;
}
errno = 0;
val = strtoull(s, &endp, base);
if (errno) {
r = -errno;
goto out;
}
if (endp == s) {
r = -EINVAL;
goto out;
}
/* make sure we reject negative numbers: */
while (qemu_isspace(*s)) {
s++;
}
if (*s == '-') {
val = 0;
r = -ERANGE;
goto out;
}
out:
*value = val;
if (endptr) {
*endptr = endp;
} else if (s && *endp) {
r = -EINVAL;
*value = 0;
}
return r;
}
/**
* parse_uint_full:
*
* @s: String to parse
* @base: integer base, between 2 and 36 inclusive, or 0
* @value: Destination for parsed integer value
*
* Parse unsigned integer from entire string, rejecting any trailing slop.
*
* Shorthand for parse_uint(s, NULL, base, value).
*/
int parse_uint_full(const char *s, int base, uint64_t *value)
{
return parse_uint(s, NULL, base, value);
}
int qemu_parse_fd(const char *param)
{
long fd;
char *endptr;
errno = 0;
fd = strtol(param, &endptr, 10);
if (param == endptr /* no conversion performed */ ||
errno != 0 /* not representable as long; possibly others */ ||
*endptr != '\0' /* final string not empty */ ||
fd < 0 /* invalid as file descriptor */ ||
fd > INT_MAX /* not representable as int */) {
return -1;
}
return fd;
}
/*
* Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
* Input is limited to 14-bit numbers
*/
int uleb128_encode_small(uint8_t *out, uint32_t n)
{
g_assert(n <= 0x3fff);
if (n < 0x80) {
*out = n;
return 1;
} else {
*out++ = (n & 0x7f) | 0x80;
*out = n >> 7;
return 2;
}
}
int uleb128_decode_small(const uint8_t *in, uint32_t *n)
{
if (!(*in & 0x80)) {
*n = *in;
return 1;
} else {
*n = *in++ & 0x7f;
/* we exceed 14 bit number */
if (*in & 0x80) {
return -1;
}
*n |= *in << 7;
return 2;
}
}
/*
* helper to parse debug environment variables
*/
int parse_debug_env(const char *name, int max, int initial)
{
char *debug_env = getenv(name);
char *inv = NULL;
long debug;
if (!debug_env) {
return initial;
}
errno = 0;
debug = strtol(debug_env, &inv, 10);
if (inv == debug_env) {
return initial;
}
if (debug < 0 || debug > max || errno != 0) {
warn_report("%s not in [0, %d]", name, max);
return initial;
}
return debug;
}
const char *si_prefix(unsigned int exp10)
{
static const char *prefixes[] = {
"a", "f", "p", "n", "u", "m", "", "K", "M", "G", "T", "P", "E"
};
exp10 += 18;
assert(exp10 % 3 == 0 && exp10 / 3 < ARRAY_SIZE(prefixes));
return prefixes[exp10 / 3];
}
const char *iec_binary_prefix(unsigned int exp2)
{
static const char *prefixes[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
assert(exp2 % 10 == 0 && exp2 / 10 < ARRAY_SIZE(prefixes));
return prefixes[exp2 / 10];
}
/*
* Return human readable string for size @val.
* @val can be anything that uint64_t allows (no more than "16 EiB").
* Use IEC binary units like KiB, MiB, and so forth.
* Caller is responsible for passing it to g_free().
*/
char *size_to_str(uint64_t val)
{
uint64_t div;
int i;
/*
* The exponent (returned in i) minus one gives us
* floor(log2(val * 1024 / 1000). The correction makes us
* switch to the higher power when the integer part is >= 1000.
* (see e41b509d68afb1f for more info)
*/
frexp(val / (1000.0 / 1024.0), &i);
i = (i - 1) / 10 * 10;
div = 1ULL << i;
return g_strdup_printf("%0.3g %sB", (double)val / div, iec_binary_prefix(i));
}
char *freq_to_str(uint64_t freq_hz)
{
double freq = freq_hz;
size_t exp10 = 0;
while (freq >= 1000.0) {
freq /= 1000.0;
exp10 += 3;
}
return g_strdup_printf("%0.3g %sHz", freq, si_prefix(exp10));
}
int qemu_pstrcmp0(const char **str1, const char **str2)
{
return g_strcmp0(*str1, *str2);
}
static inline bool starts_with_prefix(const char *dir)
{
size_t prefix_len = strlen(CONFIG_PREFIX);
/*
* dir[prefix_len] is only accessed if the length of dir is
* >= prefix_len, so no out of bounds access is possible.
*/
#pragma GCC diagnostic push
#if !defined(__clang__) || __has_warning("-Warray-bounds=")
#pragma GCC diagnostic ignored "-Warray-bounds="
#endif
return !memcmp(dir, CONFIG_PREFIX, prefix_len) &&
(!dir[prefix_len] || G_IS_DIR_SEPARATOR(dir[prefix_len]));
#pragma GCC diagnostic pop
}
/* Return the next path component in dir, and store its length in *p_len. */
static inline const char *next_component(const char *dir, int *p_len)
{
int len;
while ((*dir && G_IS_DIR_SEPARATOR(*dir)) ||
(*dir == '.' && (G_IS_DIR_SEPARATOR(dir[1]) || dir[1] == '\0'))) {
dir++;
}
len = 0;
while (dir[len] && !G_IS_DIR_SEPARATOR(dir[len])) {
len++;
}
*p_len = len;
return dir;
}
static const char *exec_dir;
void qemu_init_exec_dir(const char *argv0)
{
#ifdef G_OS_WIN32
char *p;
char buf[MAX_PATH];
DWORD len;
if (exec_dir) {
return;
}
len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
if (len == 0) {
return;
}
buf[len] = 0;
p = buf + len - 1;
while (p != buf && *p != '\\') {
p--;
}
*p = 0;
if (access(buf, R_OK) == 0) {
exec_dir = g_strdup(buf);
} else {
exec_dir = CONFIG_BINDIR;
}
#else
char *p = NULL;
char buf[PATH_MAX];
if (exec_dir) {
return;
}
#if defined(__linux__)
{
int len;
len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
if (len > 0) {
buf[len] = 0;
p = buf;
}
}
#elif defined(__FreeBSD__) \
|| (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME))
{
#if defined(__FreeBSD__)
static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
#else
static int mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME};
#endif
size_t len = sizeof(buf) - 1;
*buf = '\0';
if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) &&
*buf) {
buf[sizeof(buf) - 1] = '\0';
p = buf;
}
}
#elif defined(__APPLE__)
{
char fpath[PATH_MAX];
uint32_t len = sizeof(fpath);
if (_NSGetExecutablePath(fpath, &len) == 0) {
p = realpath(fpath, buf);
if (!p) {
return;
}
}
}
#elif defined(__HAIKU__)
{
image_info ii;
int32_t c = 0;
*buf = '\0';
while (get_next_image_info(0, &c, &ii) == B_OK) {
if (ii.type == B_APP_IMAGE) {
strncpy(buf, ii.name, sizeof(buf));
buf[sizeof(buf) - 1] = 0;
p = buf;
break;
}
}
}
#endif
/* If we don't have any way of figuring out the actual executable
location then try argv[0]. */
if (!p && argv0) {
p = realpath(argv0, buf);
}
if (p) {
exec_dir = g_path_get_dirname(p);
} else {
exec_dir = CONFIG_BINDIR;
}
#endif
}
const char *qemu_get_exec_dir(void)
{
return exec_dir;
}
char *get_relocated_path(const char *dir)
{
size_t prefix_len = strlen(CONFIG_PREFIX);
const char *bindir = CONFIG_BINDIR;
GString *result;
int len_dir, len_bindir;
/* Fail if qemu_init_exec_dir was not called. */
assert(exec_dir[0]);
result = g_string_new(exec_dir);
g_string_append(result, "/qemu-bundle");
if (access(result->str, R_OK) == 0) {
#ifdef G_OS_WIN32
const char *src = dir;
size_t size = mbsrtowcs(NULL, &src, 0, &(mbstate_t){0}) + 1;
PWSTR wdir = g_new(WCHAR, size);
mbsrtowcs(wdir, &src, size, &(mbstate_t){0});
PCWSTR wdir_skipped_root;
if (PathCchSkipRoot(wdir, &wdir_skipped_root) == S_OK) {
size = wcsrtombs(NULL, &wdir_skipped_root, 0, &(mbstate_t){0});
char *cursor = result->str + result->len;
g_string_set_size(result, result->len + size);
wcsrtombs(cursor, &wdir_skipped_root, size + 1, &(mbstate_t){0});
} else {
g_string_append(result, dir);
}
g_free(wdir);
#else
g_string_append(result, dir);
#endif
goto out;
}
if (IS_ENABLED(CONFIG_RELOCATABLE) &&
starts_with_prefix(dir) && starts_with_prefix(bindir)) {
g_string_assign(result, exec_dir);
/* Advance over common components. */
len_dir = len_bindir = prefix_len;
do {
dir += len_dir;
bindir += len_bindir;
dir = next_component(dir, &len_dir);
bindir = next_component(bindir, &len_bindir);
} while (len_dir && len_dir == len_bindir && !memcmp(dir, bindir, len_dir));
/* Ascend from bindir to the common prefix with dir. */
while (len_bindir) {
bindir += len_bindir;
g_string_append(result, "/..");
bindir = next_component(bindir, &len_bindir);
}
if (*dir) {
assert(G_IS_DIR_SEPARATOR(dir[-1]));
g_string_append(result, dir - 1);
}
goto out;
}
g_string_assign(result, dir);
out:
return g_string_free(result, false);
}
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