]>
git.proxmox.com Git - mirror_qemu.git/blob - util/cutils.c
2 * Simple C functions to supplement the C library
4 * Copyright (c) 2006 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
25 #include "qemu/osdep.h"
26 #include "qemu/host-utils.h"
30 #include <sys/sysctl.h>
35 #include <sys/sysctl.h>
39 #include <kernel/image.h>
43 #include <mach-o/dyld.h>
51 #include "qemu/ctype.h"
52 #include "qemu/cutils.h"
53 #include "qemu/error-report.h"
55 void strpadcpy(char *buf
, int buf_size
, const char *str
, char pad
)
57 int len
= qemu_strnlen(str
, buf_size
);
58 memcpy(buf
, str
, len
);
59 memset(buf
+ len
, pad
, buf_size
- len
);
62 void pstrcpy(char *buf
, int buf_size
, const char *str
)
72 if (c
== 0 || q
>= buf
+ buf_size
- 1)
79 /* strcat and truncate. */
80 char *pstrcat(char *buf
, int buf_size
, const char *s
)
85 pstrcpy(buf
+ len
, buf_size
- len
, s
);
89 int strstart(const char *str
, const char *val
, const char **ptr
)
105 int stristart(const char *str
, const char *val
, const char **ptr
)
111 if (qemu_toupper(*p
) != qemu_toupper(*q
))
121 /* XXX: use host strnlen if available ? */
122 int qemu_strnlen(const char *s
, int max_len
)
126 for(i
= 0; i
< max_len
; i
++) {
134 char *qemu_strsep(char **input
, const char *delim
)
136 char *result
= *input
;
137 if (result
!= NULL
) {
140 for (p
= result
; *p
!= '\0'; p
++) {
141 if (strchr(delim
, *p
)) {
155 time_t mktimegm(struct tm
*tm
)
158 int y
= tm
->tm_year
+ 1900, m
= tm
->tm_mon
+ 1, d
= tm
->tm_mday
;
163 t
= 86400ULL * (d
+ (153 * m
- 457) / 5 + 365 * y
+ y
/ 4 - y
/ 100 +
165 t
+= 3600 * tm
->tm_hour
+ 60 * tm
->tm_min
+ tm
->tm_sec
;
169 static int64_t suffix_mul(char suffix
, int64_t unit
)
171 switch (qemu_toupper(suffix
)) {
179 return unit
* unit
* unit
;
181 return unit
* unit
* unit
* unit
;
183 return unit
* unit
* unit
* unit
* unit
;
185 return unit
* unit
* unit
* unit
* unit
* unit
;
191 * Convert size string to bytes.
193 * The size parsing supports the following syntaxes
194 * - 12345 - decimal, scale determined by @default_suffix and @unit
195 * - 12345{bBkKmMgGtTpPeE} - decimal, scale determined by suffix and @unit
196 * - 12345.678{kKmMgGtTpPeE} - decimal, scale determined by suffix, and
197 * fractional portion is truncated to byte
198 * - 0x7fEE - hexadecimal, unit determined by @default_suffix
200 * The following are intentionally not supported
201 * - hex with scaling suffix, such as 0x20M
202 * - octal, such as 08
203 * - fractional hex, such as 0x1.8
204 * - floating point exponents, such as 1e3
206 * The end pointer will be returned in *end, if not NULL. If there is
207 * no fraction, the input can be decimal or hexadecimal; if there is a
208 * non-zero fraction, then the input must be decimal and there must be
209 * a suffix (possibly by @default_suffix) larger than Byte, and the
210 * fractional portion may suffer from precision loss or rounding. The
211 * input must be positive.
213 * Return -ERANGE on overflow (with *@end advanced), and -EINVAL on
214 * other error (with *@end at @nptr). Unlike strtoull, *@result is
215 * set to 0 on all errors, as returning UINT64_MAX on overflow is less
216 * likely to be usable as a size.
218 static int do_strtosz(const char *nptr
, const char **end
,
219 const char default_suffix
, int64_t unit
,
223 const char *endptr
, *f
;
225 uint64_t val
, valf
= 0;
228 /* Parse integral portion as decimal. */
229 retval
= qemu_strtou64(nptr
, &endptr
, 10, &val
);
233 if (memchr(nptr
, '-', endptr
- nptr
) != NULL
) {
238 if (val
== 0 && (*endptr
== 'x' || *endptr
== 'X')) {
239 /* Input looks like hex; reparse, and insist on no fraction or suffix. */
240 retval
= qemu_strtou64(nptr
, &endptr
, 16, &val
);
244 if (*endptr
== '.' || suffix_mul(*endptr
, unit
) > 0) {
249 } else if (*endptr
== '.') {
251 * Input looks like a fraction. Make sure even 1.k works
252 * without fractional digits. If we see an exponent, treat
253 * the entire input as invalid instead.
258 retval
= qemu_strtod_finite(f
, &endptr
, &fraction
);
261 } else if (memchr(f
, 'e', endptr
- f
) || memchr(f
, 'E', endptr
- f
)) {
266 /* Extract into a 64-bit fixed-point fraction. */
267 valf
= (uint64_t)(fraction
* 0x1p
64);
271 mul
= suffix_mul(c
, unit
);
275 mul
= suffix_mul(default_suffix
, unit
);
279 /* When a fraction is present, a scale is required. */
288 /* Compute exact result: 64.64 x 64.0 -> 128.64 fixed point */
289 mulu64(&val
, &valh
, val
, mul
);
290 mulu64(&valf
, &tmp
, valf
, mul
);
294 /* Round 0.5 upward. */
299 /* Report overflow. */
311 } else if (nptr
&& *endptr
) {
318 if (end
&& retval
== -EINVAL
) {
326 int qemu_strtosz(const char *nptr
, const char **end
, uint64_t *result
)
328 return do_strtosz(nptr
, end
, 'B', 1024, result
);
331 int qemu_strtosz_MiB(const char *nptr
, const char **end
, uint64_t *result
)
333 return do_strtosz(nptr
, end
, 'M', 1024, result
);
336 int qemu_strtosz_metric(const char *nptr
, const char **end
, uint64_t *result
)
338 return do_strtosz(nptr
, end
, 'B', 1000, result
);
342 * Helper function for error checking after strtol() and the like
344 static int check_strtox_error(const char *nptr
, char *ep
,
345 const char **endptr
, bool check_zero
,
350 /* Windows has a bug in that it fails to parse 0 from "0x" in base 16 */
351 if (check_zero
&& ep
== nptr
&& libc_errno
== 0) {
355 if (strtol(nptr
, &tmp
, 10) == 0 && errno
== 0 &&
356 (*tmp
== 'x' || *tmp
== 'X')) {
365 /* Turn "no conversion" into an error */
366 if (libc_errno
== 0 && ep
== nptr
) {
370 /* Fail when we're expected to consume the string, but didn't */
371 if (!endptr
&& *ep
) {
379 * Convert string @nptr to an integer, and store it in @result.
381 * This is a wrapper around strtol() that is harder to misuse.
382 * Semantics of @nptr, @endptr, @base match strtol() with differences
385 * @nptr may be null, and no conversion is performed then.
387 * If no conversion is performed, store @nptr in *@endptr and return
390 * If @endptr is null, and the string isn't fully converted, return
391 * -EINVAL. This is the case when the pointer that would be stored in
392 * a non-null @endptr points to a character other than '\0'.
394 * If the conversion overflows @result, store INT_MAX in @result,
395 * and return -ERANGE.
397 * If the conversion underflows @result, store INT_MIN in @result,
398 * and return -ERANGE.
400 * Else store the converted value in @result, and return zero.
402 * This matches the behavior of strtol() on 32-bit platforms, even on
403 * platforms where long is 64-bits.
405 int qemu_strtoi(const char *nptr
, const char **endptr
, int base
,
411 assert((unsigned) base
<= 36 && base
!= 1);
420 lresult
= strtoll(nptr
, &ep
, base
);
421 if (lresult
< INT_MIN
) {
424 } else if (lresult
> INT_MAX
) {
430 return check_strtox_error(nptr
, ep
, endptr
, lresult
== 0, errno
);
434 * Convert string @nptr to an unsigned integer, and store it in @result.
436 * This is a wrapper around strtoul() that is harder to misuse.
437 * Semantics of @nptr, @endptr, @base match strtoul() with differences
440 * @nptr may be null, and no conversion is performed then.
442 * If no conversion is performed, store @nptr in *@endptr and return
445 * If @endptr is null, and the string isn't fully converted, return
446 * -EINVAL. This is the case when the pointer that would be stored in
447 * a non-null @endptr points to a character other than '\0'.
449 * If the conversion overflows @result, store UINT_MAX in @result,
450 * and return -ERANGE.
452 * Else store the converted value in @result, and return zero.
454 * Note that a number with a leading minus sign gets converted without
455 * the minus sign, checked for overflow (see above), then negated (in
456 * @result's type). This matches the behavior of strtoul() on 32-bit
457 * platforms, even on platforms where long is 64-bits.
459 int qemu_strtoui(const char *nptr
, const char **endptr
, int base
,
460 unsigned int *result
)
463 unsigned long long lresult
;
466 assert((unsigned) base
<= 36 && base
!= 1);
475 lresult
= strtoull(nptr
, &ep
, base
);
477 /* Windows returns 1 for negative out-of-range values. */
478 if (errno
== ERANGE
) {
482 * Note that platforms with 32-bit strtoul only accept input
483 * in the range [-4294967295, 4294967295]; but we used 64-bit
484 * strtoull which wraps -18446744073709551615 to 1 instead of
485 * declaring overflow. So we must check if '-' was parsed,
486 * and if so, undo the negation before doing our bounds check.
488 neg
= memchr(nptr
, '-', ep
- nptr
) != NULL
;
492 if (lresult
> UINT_MAX
) {
496 *result
= neg
? -lresult
: lresult
;
499 return check_strtox_error(nptr
, ep
, endptr
, lresult
== 0, errno
);
503 * Convert string @nptr to a long integer, and store it in @result.
505 * This is a wrapper around strtol() that is harder to misuse.
506 * Semantics of @nptr, @endptr, @base match strtol() with differences
509 * @nptr may be null, and no conversion is performed then.
511 * If no conversion is performed, store @nptr in *@endptr and return
514 * If @endptr is null, and the string isn't fully converted, return
515 * -EINVAL. This is the case when the pointer that would be stored in
516 * a non-null @endptr points to a character other than '\0'.
518 * If the conversion overflows @result, store LONG_MAX in @result,
519 * and return -ERANGE.
521 * If the conversion underflows @result, store LONG_MIN in @result,
522 * and return -ERANGE.
524 * Else store the converted value in @result, and return zero.
526 int qemu_strtol(const char *nptr
, const char **endptr
, int base
,
531 assert((unsigned) base
<= 36 && base
!= 1);
540 *result
= strtol(nptr
, &ep
, base
);
541 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
545 * Convert string @nptr to an unsigned long, and store it in @result.
547 * This is a wrapper around strtoul() that is harder to misuse.
548 * Semantics of @nptr, @endptr, @base match strtoul() with differences
551 * @nptr may be null, and no conversion is performed then.
553 * If no conversion is performed, store @nptr in *@endptr and return
556 * If @endptr is null, and the string isn't fully converted, return
557 * -EINVAL. This is the case when the pointer that would be stored in
558 * a non-null @endptr points to a character other than '\0'.
560 * If the conversion overflows @result, store ULONG_MAX in @result,
561 * and return -ERANGE.
563 * Else store the converted value in @result, and return zero.
565 * Note that a number with a leading minus sign gets converted without
566 * the minus sign, checked for overflow (see above), then negated (in
567 * @result's type). This is exactly how strtoul() works.
569 int qemu_strtoul(const char *nptr
, const char **endptr
, int base
,
570 unsigned long *result
)
574 assert((unsigned) base
<= 36 && base
!= 1);
583 *result
= strtoul(nptr
, &ep
, base
);
584 /* Windows returns 1 for negative out-of-range values. */
585 if (errno
== ERANGE
) {
588 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
592 * Convert string @nptr to an int64_t.
594 * Works like qemu_strtol(), except it stores INT64_MAX on overflow,
595 * and INT64_MIN on underflow.
597 int qemu_strtoi64(const char *nptr
, const char **endptr
, int base
,
602 assert((unsigned) base
<= 36 && base
!= 1);
610 /* This assumes int64_t is long long TODO relax */
611 QEMU_BUILD_BUG_ON(sizeof(int64_t) != sizeof(long long));
613 *result
= strtoll(nptr
, &ep
, base
);
614 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
618 * Convert string @nptr to an uint64_t.
620 * Works like qemu_strtoul(), except it stores UINT64_MAX on overflow.
621 * (If you want to prohibit negative numbers that wrap around to
622 * positive, use parse_uint()).
624 int qemu_strtou64(const char *nptr
, const char **endptr
, int base
,
629 assert((unsigned) base
<= 36 && base
!= 1);
637 /* This assumes uint64_t is unsigned long long TODO relax */
638 QEMU_BUILD_BUG_ON(sizeof(uint64_t) != sizeof(unsigned long long));
640 *result
= strtoull(nptr
, &ep
, base
);
641 /* Windows returns 1 for negative out-of-range values. */
642 if (errno
== ERANGE
) {
645 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
649 * Convert string @nptr to a double.
651 * This is a wrapper around strtod() that is harder to misuse.
652 * Semantics of @nptr and @endptr match strtod() with differences
655 * @nptr may be null, and no conversion is performed then.
657 * If no conversion is performed, store @nptr in *@endptr and return
660 * If @endptr is null, and the string isn't fully converted, return
661 * -EINVAL. This is the case when the pointer that would be stored in
662 * a non-null @endptr points to a character other than '\0'.
664 * If the conversion overflows, store +/-HUGE_VAL in @result, depending
665 * on the sign, and return -ERANGE.
667 * If the conversion underflows, store +/-0.0 in @result, depending on the
668 * sign, and return -ERANGE.
670 * Else store the converted value in @result, and return zero.
672 int qemu_strtod(const char *nptr
, const char **endptr
, double *result
)
684 *result
= strtod(nptr
, &ep
);
685 return check_strtox_error(nptr
, ep
, endptr
, false, errno
);
689 * Convert string @nptr to a finite double.
691 * Works like qemu_strtod(), except that "NaN" and "inf" are rejected
692 * with -EINVAL and no conversion is performed.
694 int qemu_strtod_finite(const char *nptr
, const char **endptr
, double *result
)
699 ret
= qemu_strtod(nptr
, endptr
, &tmp
);
700 if (!ret
&& !isfinite(tmp
)) {
707 if (ret
!= -EINVAL
) {
714 * Searches for the first occurrence of 'c' in 's', and returns a pointer
715 * to the trailing null byte if none was found.
717 #ifndef HAVE_STRCHRNUL
718 const char *qemu_strchrnul(const char *s
, int c
)
720 const char *e
= strchr(s
, c
);
731 * @s: String to parse
732 * @endptr: Destination for pointer to first character not consumed
733 * @base: integer base, between 2 and 36 inclusive, or 0
734 * @value: Destination for parsed integer value
736 * Parse unsigned integer
738 * Parsed syntax is like strtoull()'s: arbitrary whitespace, a single optional
739 * '+' or '-', an optional "0x" if @base is 0 or 16, one or more digits.
741 * If @s is null, or @s doesn't start with an integer in the syntax
742 * above, set *@value to 0, *@endptr to @s, and return -EINVAL.
744 * Set *@endptr to point right beyond the parsed integer (even if the integer
745 * overflows or is negative, all digits will be parsed and *@endptr will
746 * point right beyond them). If @endptr is %NULL, any trailing character
747 * instead causes a result of -EINVAL with *@value of 0.
749 * If the integer is negative, set *@value to 0, and return -ERANGE.
750 * (If you want to allow negative numbers that wrap around within
751 * bounds, use qemu_strtou64()).
753 * If the integer overflows unsigned long long, set *@value to
754 * ULLONG_MAX, and return -ERANGE.
756 * Else, set *@value to the parsed integer, and return 0.
758 int parse_uint(const char *s
, const char **endptr
, int base
, uint64_t *value
)
761 char *endp
= (char *)s
;
762 unsigned long long val
= 0;
764 assert((unsigned) base
<= 36 && base
!= 1);
771 val
= strtoull(s
, &endp
, base
);
782 /* make sure we reject negative numbers: */
783 while (qemu_isspace(*s
)) {
796 } else if (s
&& *endp
) {
806 * @s: String to parse
807 * @base: integer base, between 2 and 36 inclusive, or 0
808 * @value: Destination for parsed integer value
810 * Parse unsigned integer from entire string, rejecting any trailing slop.
812 * Shorthand for parse_uint(s, NULL, base, value).
814 int parse_uint_full(const char *s
, int base
, uint64_t *value
)
816 return parse_uint(s
, NULL
, base
, value
);
819 int qemu_parse_fd(const char *param
)
825 fd
= strtol(param
, &endptr
, 10);
826 if (param
== endptr
/* no conversion performed */ ||
827 errno
!= 0 /* not representable as long; possibly others */ ||
828 *endptr
!= '\0' /* final string not empty */ ||
829 fd
< 0 /* invalid as file descriptor */ ||
830 fd
> INT_MAX
/* not representable as int */) {
837 * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
838 * Input is limited to 14-bit numbers
840 int uleb128_encode_small(uint8_t *out
, uint32_t n
)
842 g_assert(n
<= 0x3fff);
847 *out
++ = (n
& 0x7f) | 0x80;
853 int uleb128_decode_small(const uint8_t *in
, uint32_t *n
)
860 /* we exceed 14 bit number */
870 * helper to parse debug environment variables
872 int parse_debug_env(const char *name
, int max
, int initial
)
874 char *debug_env
= getenv(name
);
882 debug
= strtol(debug_env
, &inv
, 10);
883 if (inv
== debug_env
) {
886 if (debug
< 0 || debug
> max
|| errno
!= 0) {
887 warn_report("%s not in [0, %d]", name
, max
);
893 const char *si_prefix(unsigned int exp10
)
895 static const char *prefixes
[] = {
896 "a", "f", "p", "n", "u", "m", "", "K", "M", "G", "T", "P", "E"
900 assert(exp10
% 3 == 0 && exp10
/ 3 < ARRAY_SIZE(prefixes
));
901 return prefixes
[exp10
/ 3];
904 const char *iec_binary_prefix(unsigned int exp2
)
906 static const char *prefixes
[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
908 assert(exp2
% 10 == 0 && exp2
/ 10 < ARRAY_SIZE(prefixes
));
909 return prefixes
[exp2
/ 10];
913 * Return human readable string for size @val.
914 * @val can be anything that uint64_t allows (no more than "16 EiB").
915 * Use IEC binary units like KiB, MiB, and so forth.
916 * Caller is responsible for passing it to g_free().
918 char *size_to_str(uint64_t val
)
924 * The exponent (returned in i) minus one gives us
925 * floor(log2(val * 1024 / 1000). The correction makes us
926 * switch to the higher power when the integer part is >= 1000.
927 * (see e41b509d68afb1f for more info)
929 frexp(val
/ (1000.0 / 1024.0), &i
);
930 i
= (i
- 1) / 10 * 10;
933 return g_strdup_printf("%0.3g %sB", (double)val
/ div
, iec_binary_prefix(i
));
936 char *freq_to_str(uint64_t freq_hz
)
938 double freq
= freq_hz
;
941 while (freq
>= 1000.0) {
946 return g_strdup_printf("%0.3g %sHz", freq
, si_prefix(exp10
));
949 int qemu_pstrcmp0(const char **str1
, const char **str2
)
951 return g_strcmp0(*str1
, *str2
);
954 static inline bool starts_with_prefix(const char *dir
)
956 size_t prefix_len
= strlen(CONFIG_PREFIX
);
957 return !memcmp(dir
, CONFIG_PREFIX
, prefix_len
) &&
958 (!dir
[prefix_len
] || G_IS_DIR_SEPARATOR(dir
[prefix_len
]));
961 /* Return the next path component in dir, and store its length in *p_len. */
962 static inline const char *next_component(const char *dir
, int *p_len
)
965 while ((*dir
&& G_IS_DIR_SEPARATOR(*dir
)) ||
966 (*dir
== '.' && (G_IS_DIR_SEPARATOR(dir
[1]) || dir
[1] == '\0'))) {
970 while (dir
[len
] && !G_IS_DIR_SEPARATOR(dir
[len
])) {
977 static const char *exec_dir
;
979 void qemu_init_exec_dir(const char *argv0
)
990 len
= GetModuleFileName(NULL
, buf
, sizeof(buf
) - 1);
997 while (p
!= buf
&& *p
!= '\\') {
1001 if (access(buf
, R_OK
) == 0) {
1002 exec_dir
= g_strdup(buf
);
1004 exec_dir
= CONFIG_BINDIR
;
1014 #if defined(__linux__)
1017 len
= readlink("/proc/self/exe", buf
, sizeof(buf
) - 1);
1023 #elif defined(__FreeBSD__) \
1024 || (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME))
1026 #if defined(__FreeBSD__)
1027 static int mib
[4] = {CTL_KERN
, KERN_PROC
, KERN_PROC_PATHNAME
, -1};
1029 static int mib
[4] = {CTL_KERN
, KERN_PROC_ARGS
, -1, KERN_PROC_PATHNAME
};
1031 size_t len
= sizeof(buf
) - 1;
1034 if (!sysctl(mib
, ARRAY_SIZE(mib
), buf
, &len
, NULL
, 0) &&
1036 buf
[sizeof(buf
) - 1] = '\0';
1040 #elif defined(__APPLE__)
1042 char fpath
[PATH_MAX
];
1043 uint32_t len
= sizeof(fpath
);
1044 if (_NSGetExecutablePath(fpath
, &len
) == 0) {
1045 p
= realpath(fpath
, buf
);
1051 #elif defined(__HAIKU__)
1057 while (get_next_image_info(0, &c
, &ii
) == B_OK
) {
1058 if (ii
.type
== B_APP_IMAGE
) {
1059 strncpy(buf
, ii
.name
, sizeof(buf
));
1060 buf
[sizeof(buf
) - 1] = 0;
1067 /* If we don't have any way of figuring out the actual executable
1068 location then try argv[0]. */
1070 p
= realpath(argv0
, buf
);
1073 exec_dir
= g_path_get_dirname(p
);
1075 exec_dir
= CONFIG_BINDIR
;
1080 const char *qemu_get_exec_dir(void)
1085 char *get_relocated_path(const char *dir
)
1087 size_t prefix_len
= strlen(CONFIG_PREFIX
);
1088 const char *bindir
= CONFIG_BINDIR
;
1089 const char *exec_dir
= qemu_get_exec_dir();
1091 int len_dir
, len_bindir
;
1093 /* Fail if qemu_init_exec_dir was not called. */
1094 assert(exec_dir
[0]);
1096 result
= g_string_new(exec_dir
);
1097 g_string_append(result
, "/qemu-bundle");
1098 if (access(result
->str
, R_OK
) == 0) {
1100 size_t size
= mbsrtowcs(NULL
, &dir
, 0, &(mbstate_t){0}) + 1;
1101 PWSTR wdir
= g_new(WCHAR
, size
);
1102 mbsrtowcs(wdir
, &dir
, size
, &(mbstate_t){0});
1104 PCWSTR wdir_skipped_root
;
1105 PathCchSkipRoot(wdir
, &wdir_skipped_root
);
1107 size
= wcsrtombs(NULL
, &wdir_skipped_root
, 0, &(mbstate_t){0});
1108 char *cursor
= result
->str
+ result
->len
;
1109 g_string_set_size(result
, result
->len
+ size
);
1110 wcsrtombs(cursor
, &wdir_skipped_root
, size
+ 1, &(mbstate_t){0});
1113 g_string_append(result
, dir
);
1115 } else if (!starts_with_prefix(dir
) || !starts_with_prefix(bindir
)) {
1116 g_string_assign(result
, dir
);
1118 g_string_assign(result
, exec_dir
);
1120 /* Advance over common components. */
1121 len_dir
= len_bindir
= prefix_len
;
1124 bindir
+= len_bindir
;
1125 dir
= next_component(dir
, &len_dir
);
1126 bindir
= next_component(bindir
, &len_bindir
);
1127 } while (len_dir
&& len_dir
== len_bindir
&& !memcmp(dir
, bindir
, len_dir
));
1129 /* Ascend from bindir to the common prefix with dir. */
1130 while (len_bindir
) {
1131 bindir
+= len_bindir
;
1132 g_string_append(result
, "/..");
1133 bindir
= next_component(bindir
, &len_bindir
);
1137 assert(G_IS_DIR_SEPARATOR(dir
[-1]));
1138 g_string_append(result
, dir
- 1);
1142 return g_string_free(result
, false);