]>
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 * fraction, then the input must be decimal and there must be a suffix
209 * (possibly by @default_suffix) larger than Byte, and the fractional
210 * portion may suffer from precision loss or rounding. The input must
213 * Return -ERANGE on overflow (with *@end advanced), and -EINVAL on
214 * other error (with *@end left unchanged).
216 static int do_strtosz(const char *nptr
, const char **end
,
217 const char default_suffix
, int64_t unit
,
221 const char *endptr
, *f
;
223 uint64_t val
, valf
= 0;
226 /* Parse integral portion as decimal. */
227 retval
= qemu_strtou64(nptr
, &endptr
, 10, &val
);
231 if (memchr(nptr
, '-', endptr
- nptr
) != NULL
) {
236 if (val
== 0 && (*endptr
== 'x' || *endptr
== 'X')) {
237 /* Input looks like hex; reparse, and insist on no fraction or suffix. */
238 retval
= qemu_strtou64(nptr
, &endptr
, 16, &val
);
242 if (*endptr
== '.' || suffix_mul(*endptr
, unit
) > 0) {
247 } else if (*endptr
== '.') {
249 * Input looks like a fraction. Make sure even 1.k works
250 * without fractional digits. If we see an exponent, treat
251 * the entire input as invalid instead.
256 retval
= qemu_strtod_finite(f
, &endptr
, &fraction
);
259 } else if (memchr(f
, 'e', endptr
- f
) || memchr(f
, 'E', endptr
- f
)) {
264 /* Extract into a 64-bit fixed-point fraction. */
265 valf
= (uint64_t)(fraction
* 0x1p
64);
269 mul
= suffix_mul(c
, unit
);
273 mul
= suffix_mul(default_suffix
, unit
);
277 /* When a fraction is present, a scale is required. */
286 /* Compute exact result: 64.64 x 64.0 -> 128.64 fixed point */
287 mulu64(&val
, &valh
, val
, mul
);
288 mulu64(&valf
, &tmp
, valf
, mul
);
292 /* Round 0.5 upward. */
297 /* Report overflow. */
309 } else if (*endptr
) {
319 int qemu_strtosz(const char *nptr
, const char **end
, uint64_t *result
)
321 return do_strtosz(nptr
, end
, 'B', 1024, result
);
324 int qemu_strtosz_MiB(const char *nptr
, const char **end
, uint64_t *result
)
326 return do_strtosz(nptr
, end
, 'M', 1024, result
);
329 int qemu_strtosz_metric(const char *nptr
, const char **end
, uint64_t *result
)
331 return do_strtosz(nptr
, end
, 'B', 1000, result
);
335 * Helper function for error checking after strtol() and the like
337 static int check_strtox_error(const char *nptr
, char *ep
,
338 const char **endptr
, bool check_zero
,
343 /* Windows has a bug in that it fails to parse 0 from "0x" in base 16 */
344 if (check_zero
&& ep
== nptr
&& libc_errno
== 0) {
348 if (strtol(nptr
, &tmp
, 10) == 0 && errno
== 0 &&
349 (*tmp
== 'x' || *tmp
== 'X')) {
358 /* Turn "no conversion" into an error */
359 if (libc_errno
== 0 && ep
== nptr
) {
363 /* Fail when we're expected to consume the string, but didn't */
364 if (!endptr
&& *ep
) {
372 * Convert string @nptr to an integer, and store it in @result.
374 * This is a wrapper around strtol() that is harder to misuse.
375 * Semantics of @nptr, @endptr, @base match strtol() with differences
378 * @nptr may be null, and no conversion is performed then.
380 * If no conversion is performed, store @nptr in *@endptr and return
383 * If @endptr is null, and the string isn't fully converted, return
384 * -EINVAL. This is the case when the pointer that would be stored in
385 * a non-null @endptr points to a character other than '\0'.
387 * If the conversion overflows @result, store INT_MAX in @result,
388 * and return -ERANGE.
390 * If the conversion underflows @result, store INT_MIN in @result,
391 * and return -ERANGE.
393 * Else store the converted value in @result, and return zero.
395 * This matches the behavior of strtol() on 32-bit platforms, even on
396 * platforms where long is 64-bits.
398 int qemu_strtoi(const char *nptr
, const char **endptr
, int base
,
404 assert((unsigned) base
<= 36 && base
!= 1);
413 lresult
= strtoll(nptr
, &ep
, base
);
414 if (lresult
< INT_MIN
) {
417 } else if (lresult
> INT_MAX
) {
423 return check_strtox_error(nptr
, ep
, endptr
, lresult
== 0, errno
);
427 * Convert string @nptr to an unsigned integer, and store it in @result.
429 * This is a wrapper around strtoul() that is harder to misuse.
430 * Semantics of @nptr, @endptr, @base match strtoul() with differences
433 * @nptr may be null, and no conversion is performed then.
435 * If no conversion is performed, store @nptr in *@endptr and return
438 * If @endptr is null, and the string isn't fully converted, return
439 * -EINVAL. This is the case when the pointer that would be stored in
440 * a non-null @endptr points to a character other than '\0'.
442 * If the conversion overflows @result, store UINT_MAX in @result,
443 * and return -ERANGE.
445 * Else store the converted value in @result, and return zero.
447 * Note that a number with a leading minus sign gets converted without
448 * the minus sign, checked for overflow (see above), then negated (in
449 * @result's type). This matches the behavior of strtoul() on 32-bit
450 * platforms, even on platforms where long is 64-bits.
452 int qemu_strtoui(const char *nptr
, const char **endptr
, int base
,
453 unsigned int *result
)
456 unsigned long long lresult
;
459 assert((unsigned) base
<= 36 && base
!= 1);
468 lresult
= strtoull(nptr
, &ep
, base
);
470 /* Windows returns 1 for negative out-of-range values. */
471 if (errno
== ERANGE
) {
475 * Note that platforms with 32-bit strtoul only accept input
476 * in the range [-4294967295, 4294967295]; but we used 64-bit
477 * strtoull which wraps -18446744073709551615 to 1 instead of
478 * declaring overflow. So we must check if '-' was parsed,
479 * and if so, undo the negation before doing our bounds check.
481 neg
= memchr(nptr
, '-', ep
- nptr
) != NULL
;
485 if (lresult
> UINT_MAX
) {
489 *result
= neg
? -lresult
: lresult
;
492 return check_strtox_error(nptr
, ep
, endptr
, lresult
== 0, errno
);
496 * Convert string @nptr to a long integer, and store it in @result.
498 * This is a wrapper around strtol() that is harder to misuse.
499 * Semantics of @nptr, @endptr, @base match strtol() with differences
502 * @nptr may be null, and no conversion is performed then.
504 * If no conversion is performed, store @nptr in *@endptr and return
507 * If @endptr is null, and the string isn't fully converted, return
508 * -EINVAL. This is the case when the pointer that would be stored in
509 * a non-null @endptr points to a character other than '\0'.
511 * If the conversion overflows @result, store LONG_MAX in @result,
512 * and return -ERANGE.
514 * If the conversion underflows @result, store LONG_MIN in @result,
515 * and return -ERANGE.
517 * Else store the converted value in @result, and return zero.
519 int qemu_strtol(const char *nptr
, const char **endptr
, int base
,
524 assert((unsigned) base
<= 36 && base
!= 1);
533 *result
= strtol(nptr
, &ep
, base
);
534 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
538 * Convert string @nptr to an unsigned long, and store it in @result.
540 * This is a wrapper around strtoul() that is harder to misuse.
541 * Semantics of @nptr, @endptr, @base match strtoul() with differences
544 * @nptr may be null, and no conversion is performed then.
546 * If no conversion is performed, store @nptr in *@endptr and return
549 * If @endptr is null, and the string isn't fully converted, return
550 * -EINVAL. This is the case when the pointer that would be stored in
551 * a non-null @endptr points to a character other than '\0'.
553 * If the conversion overflows @result, store ULONG_MAX in @result,
554 * and return -ERANGE.
556 * Else store the converted value in @result, and return zero.
558 * Note that a number with a leading minus sign gets converted without
559 * the minus sign, checked for overflow (see above), then negated (in
560 * @result's type). This is exactly how strtoul() works.
562 int qemu_strtoul(const char *nptr
, const char **endptr
, int base
,
563 unsigned long *result
)
567 assert((unsigned) base
<= 36 && base
!= 1);
576 *result
= strtoul(nptr
, &ep
, base
);
577 /* Windows returns 1 for negative out-of-range values. */
578 if (errno
== ERANGE
) {
581 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
585 * Convert string @nptr to an int64_t.
587 * Works like qemu_strtol(), except it stores INT64_MAX on overflow,
588 * and INT64_MIN on underflow.
590 int qemu_strtoi64(const char *nptr
, const char **endptr
, int base
,
595 assert((unsigned) base
<= 36 && base
!= 1);
603 /* This assumes int64_t is long long TODO relax */
604 QEMU_BUILD_BUG_ON(sizeof(int64_t) != sizeof(long long));
606 *result
= strtoll(nptr
, &ep
, base
);
607 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
611 * Convert string @nptr to an uint64_t.
613 * Works like qemu_strtoul(), except it stores UINT64_MAX on overflow.
614 * (If you want to prohibit negative numbers that wrap around to
615 * positive, use parse_uint()).
617 int qemu_strtou64(const char *nptr
, const char **endptr
, int base
,
622 assert((unsigned) base
<= 36 && base
!= 1);
630 /* This assumes uint64_t is unsigned long long TODO relax */
631 QEMU_BUILD_BUG_ON(sizeof(uint64_t) != sizeof(unsigned long long));
633 *result
= strtoull(nptr
, &ep
, base
);
634 /* Windows returns 1 for negative out-of-range values. */
635 if (errno
== ERANGE
) {
638 return check_strtox_error(nptr
, ep
, endptr
, *result
== 0, errno
);
642 * Convert string @nptr to a double.
644 * This is a wrapper around strtod() that is harder to misuse.
645 * Semantics of @nptr and @endptr match strtod() with differences
648 * @nptr may be null, and no conversion is performed then.
650 * If no conversion is performed, store @nptr in *@endptr and return
653 * If @endptr is null, and the string isn't fully converted, return
654 * -EINVAL. This is the case when the pointer that would be stored in
655 * a non-null @endptr points to a character other than '\0'.
657 * If the conversion overflows, store +/-HUGE_VAL in @result, depending
658 * on the sign, and return -ERANGE.
660 * If the conversion underflows, store +/-0.0 in @result, depending on the
661 * sign, and return -ERANGE.
663 * Else store the converted value in @result, and return zero.
665 int qemu_strtod(const char *nptr
, const char **endptr
, double *result
)
677 *result
= strtod(nptr
, &ep
);
678 return check_strtox_error(nptr
, ep
, endptr
, false, errno
);
682 * Convert string @nptr to a finite double.
684 * Works like qemu_strtod(), except that "NaN" and "inf" are rejected
685 * with -EINVAL and no conversion is performed.
687 int qemu_strtod_finite(const char *nptr
, const char **endptr
, double *result
)
692 ret
= qemu_strtod(nptr
, endptr
, &tmp
);
693 if (!ret
&& !isfinite(tmp
)) {
700 if (ret
!= -EINVAL
) {
707 * Searches for the first occurrence of 'c' in 's', and returns a pointer
708 * to the trailing null byte if none was found.
710 #ifndef HAVE_STRCHRNUL
711 const char *qemu_strchrnul(const char *s
, int c
)
713 const char *e
= strchr(s
, c
);
724 * @s: String to parse
725 * @endptr: Destination for pointer to first character not consumed, must
727 * @base: integer base, between 2 and 36 inclusive, or 0
728 * @value: Destination for parsed integer value
730 * Parse unsigned integer
732 * Parsed syntax is like strtoull()'s: arbitrary whitespace, a single optional
733 * '+' or '-', an optional "0x" if @base is 0 or 16, one or more digits.
735 * If @s is null, or @s doesn't start with an integer in the syntax
736 * above, set *@value to 0, *@endptr to @s, and return -EINVAL.
738 * Set *@endptr to point right beyond the parsed integer (even if the integer
739 * overflows or is negative, all digits will be parsed and *@endptr will
740 * point right beyond them).
742 * If the integer is negative, set *@value to 0, and return -ERANGE.
743 * (If you want to allow negative numbers that wrap around within
744 * bounds, use qemu_strtou64()).
746 * If the integer overflows unsigned long long, set *@value to
747 * ULLONG_MAX, and return -ERANGE.
749 * Else, set *@value to the parsed integer, and return 0.
751 int parse_uint(const char *s
, const char **endptr
, int base
, uint64_t *value
)
754 char *endp
= (char *)s
;
755 unsigned long long val
= 0;
757 assert((unsigned) base
<= 36 && base
!= 1);
764 val
= strtoull(s
, &endp
, base
);
775 /* make sure we reject negative numbers: */
776 while (qemu_isspace(*s
)) {
794 * @s: String to parse
795 * @base: integer base, between 2 and 36 inclusive, or 0
796 * @value: Destination for parsed integer value
798 * Parse unsigned integer from entire string
800 * Have the same behavior of parse_uint(), but with an additional
801 * check for additional data after the parsed number. If extra
802 * characters are present after a non-overflowing parsed number, the
803 * function will return -EINVAL, and *@v will be set to 0.
805 int parse_uint_full(const char *s
, int base
, uint64_t *value
)
810 r
= parse_uint(s
, &endp
, base
, value
);
822 int qemu_parse_fd(const char *param
)
828 fd
= strtol(param
, &endptr
, 10);
829 if (param
== endptr
/* no conversion performed */ ||
830 errno
!= 0 /* not representable as long; possibly others */ ||
831 *endptr
!= '\0' /* final string not empty */ ||
832 fd
< 0 /* invalid as file descriptor */ ||
833 fd
> INT_MAX
/* not representable as int */) {
840 * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
841 * Input is limited to 14-bit numbers
843 int uleb128_encode_small(uint8_t *out
, uint32_t n
)
845 g_assert(n
<= 0x3fff);
850 *out
++ = (n
& 0x7f) | 0x80;
856 int uleb128_decode_small(const uint8_t *in
, uint32_t *n
)
863 /* we exceed 14 bit number */
873 * helper to parse debug environment variables
875 int parse_debug_env(const char *name
, int max
, int initial
)
877 char *debug_env
= getenv(name
);
885 debug
= strtol(debug_env
, &inv
, 10);
886 if (inv
== debug_env
) {
889 if (debug
< 0 || debug
> max
|| errno
!= 0) {
890 warn_report("%s not in [0, %d]", name
, max
);
896 const char *si_prefix(unsigned int exp10
)
898 static const char *prefixes
[] = {
899 "a", "f", "p", "n", "u", "m", "", "K", "M", "G", "T", "P", "E"
903 assert(exp10
% 3 == 0 && exp10
/ 3 < ARRAY_SIZE(prefixes
));
904 return prefixes
[exp10
/ 3];
907 const char *iec_binary_prefix(unsigned int exp2
)
909 static const char *prefixes
[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
911 assert(exp2
% 10 == 0 && exp2
/ 10 < ARRAY_SIZE(prefixes
));
912 return prefixes
[exp2
/ 10];
916 * Return human readable string for size @val.
917 * @val can be anything that uint64_t allows (no more than "16 EiB").
918 * Use IEC binary units like KiB, MiB, and so forth.
919 * Caller is responsible for passing it to g_free().
921 char *size_to_str(uint64_t val
)
927 * The exponent (returned in i) minus one gives us
928 * floor(log2(val * 1024 / 1000). The correction makes us
929 * switch to the higher power when the integer part is >= 1000.
930 * (see e41b509d68afb1f for more info)
932 frexp(val
/ (1000.0 / 1024.0), &i
);
933 i
= (i
- 1) / 10 * 10;
936 return g_strdup_printf("%0.3g %sB", (double)val
/ div
, iec_binary_prefix(i
));
939 char *freq_to_str(uint64_t freq_hz
)
941 double freq
= freq_hz
;
944 while (freq
>= 1000.0) {
949 return g_strdup_printf("%0.3g %sHz", freq
, si_prefix(exp10
));
952 int qemu_pstrcmp0(const char **str1
, const char **str2
)
954 return g_strcmp0(*str1
, *str2
);
957 static inline bool starts_with_prefix(const char *dir
)
959 size_t prefix_len
= strlen(CONFIG_PREFIX
);
960 return !memcmp(dir
, CONFIG_PREFIX
, prefix_len
) &&
961 (!dir
[prefix_len
] || G_IS_DIR_SEPARATOR(dir
[prefix_len
]));
964 /* Return the next path component in dir, and store its length in *p_len. */
965 static inline const char *next_component(const char *dir
, int *p_len
)
968 while ((*dir
&& G_IS_DIR_SEPARATOR(*dir
)) ||
969 (*dir
== '.' && (G_IS_DIR_SEPARATOR(dir
[1]) || dir
[1] == '\0'))) {
973 while (dir
[len
] && !G_IS_DIR_SEPARATOR(dir
[len
])) {
980 static const char *exec_dir
;
982 void qemu_init_exec_dir(const char *argv0
)
993 len
= GetModuleFileName(NULL
, buf
, sizeof(buf
) - 1);
1000 while (p
!= buf
&& *p
!= '\\') {
1004 if (access(buf
, R_OK
) == 0) {
1005 exec_dir
= g_strdup(buf
);
1007 exec_dir
= CONFIG_BINDIR
;
1017 #if defined(__linux__)
1020 len
= readlink("/proc/self/exe", buf
, sizeof(buf
) - 1);
1026 #elif defined(__FreeBSD__) \
1027 || (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME))
1029 #if defined(__FreeBSD__)
1030 static int mib
[4] = {CTL_KERN
, KERN_PROC
, KERN_PROC_PATHNAME
, -1};
1032 static int mib
[4] = {CTL_KERN
, KERN_PROC_ARGS
, -1, KERN_PROC_PATHNAME
};
1034 size_t len
= sizeof(buf
) - 1;
1037 if (!sysctl(mib
, ARRAY_SIZE(mib
), buf
, &len
, NULL
, 0) &&
1039 buf
[sizeof(buf
) - 1] = '\0';
1043 #elif defined(__APPLE__)
1045 char fpath
[PATH_MAX
];
1046 uint32_t len
= sizeof(fpath
);
1047 if (_NSGetExecutablePath(fpath
, &len
) == 0) {
1048 p
= realpath(fpath
, buf
);
1054 #elif defined(__HAIKU__)
1060 while (get_next_image_info(0, &c
, &ii
) == B_OK
) {
1061 if (ii
.type
== B_APP_IMAGE
) {
1062 strncpy(buf
, ii
.name
, sizeof(buf
));
1063 buf
[sizeof(buf
) - 1] = 0;
1070 /* If we don't have any way of figuring out the actual executable
1071 location then try argv[0]. */
1073 p
= realpath(argv0
, buf
);
1076 exec_dir
= g_path_get_dirname(p
);
1078 exec_dir
= CONFIG_BINDIR
;
1083 const char *qemu_get_exec_dir(void)
1088 char *get_relocated_path(const char *dir
)
1090 size_t prefix_len
= strlen(CONFIG_PREFIX
);
1091 const char *bindir
= CONFIG_BINDIR
;
1092 const char *exec_dir
= qemu_get_exec_dir();
1094 int len_dir
, len_bindir
;
1096 /* Fail if qemu_init_exec_dir was not called. */
1097 assert(exec_dir
[0]);
1099 result
= g_string_new(exec_dir
);
1100 g_string_append(result
, "/qemu-bundle");
1101 if (access(result
->str
, R_OK
) == 0) {
1103 size_t size
= mbsrtowcs(NULL
, &dir
, 0, &(mbstate_t){0}) + 1;
1104 PWSTR wdir
= g_new(WCHAR
, size
);
1105 mbsrtowcs(wdir
, &dir
, size
, &(mbstate_t){0});
1107 PCWSTR wdir_skipped_root
;
1108 PathCchSkipRoot(wdir
, &wdir_skipped_root
);
1110 size
= wcsrtombs(NULL
, &wdir_skipped_root
, 0, &(mbstate_t){0});
1111 char *cursor
= result
->str
+ result
->len
;
1112 g_string_set_size(result
, result
->len
+ size
);
1113 wcsrtombs(cursor
, &wdir_skipped_root
, size
+ 1, &(mbstate_t){0});
1116 g_string_append(result
, dir
);
1118 } else if (!starts_with_prefix(dir
) || !starts_with_prefix(bindir
)) {
1119 g_string_assign(result
, dir
);
1121 g_string_assign(result
, exec_dir
);
1123 /* Advance over common components. */
1124 len_dir
= len_bindir
= prefix_len
;
1127 bindir
+= len_bindir
;
1128 dir
= next_component(dir
, &len_dir
);
1129 bindir
= next_component(bindir
, &len_bindir
);
1130 } while (len_dir
&& len_dir
== len_bindir
&& !memcmp(dir
, bindir
, len_dir
));
1132 /* Ascend from bindir to the common prefix with dir. */
1133 while (len_bindir
) {
1134 bindir
+= len_bindir
;
1135 g_string_append(result
, "/..");
1136 bindir
= next_component(bindir
, &len_bindir
);
1140 assert(G_IS_DIR_SEPARATOR(dir
[-1]));
1141 g_string_append(result
, dir
- 1);
1145 return g_string_free(result
, false);