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fix aliasing-based undefined behavior in mbsrtowcs
[musl]
/
src
/
misc
/
realpath.c
diff --git
a/src/misc/realpath.c
b/src/misc/realpath.c
index
ef156fc
..
d2708e5
100644
(file)
--- a/
src/misc/realpath.c
+++ b/
src/misc/realpath.c
@@
-1,49
+1,43
@@
#include <stdlib.h>
#include <stdlib.h>
-#include <stdio.h>
#include <limits.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
+#include <string.h>
+#include "syscall.h"
-char *realpath(const char *
filename, char *
resolved)
+char *realpath(const char *
restrict filename, char *restrict
resolved)
{
int fd;
ssize_t r;
struct stat st1, st2;
char buf[15+3*sizeof(int)];
{
int fd;
ssize_t r;
struct stat st1, st2;
char buf[15+3*sizeof(int)];
-
int alloc = 0
;
+
char tmp[PATH_MAX]
;
if (!filename) {
errno = EINVAL;
return 0;
}
if (!filename) {
errno = EINVAL;
return 0;
}
- fd =
open(filename, O_RDONLY|O_NONBLOCK
);
+ fd =
sys_open(filename, O_PATH|O_NONBLOCK|O_CLOEXEC
);
if (fd < 0) return 0;
if (fd < 0) return 0;
-
snprintf(buf, sizeof buf, "/proc/self/fd/%d"
, fd);
+
__procfdname(buf
, fd);
- if (!resolved) {
- alloc = 1;
- resolved = malloc(PATH_MAX);
- if (!resolved) return 0;
- }
-
- r = readlink(buf, resolved, PATH_MAX-1);
+ r = readlink(buf, tmp, sizeof tmp - 1);
if (r < 0) goto err;
if (r < 0) goto err;
-
resolved
[r] = 0;
+
tmp
[r] = 0;
fstat(fd, &st1);
fstat(fd, &st1);
- r = stat(
resolved
, &st2);
+ r = stat(
tmp
, &st2);
if (r<0 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) {
if (!r) errno = ELOOP;
goto err;
}
if (r<0 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) {
if (!r) errno = ELOOP;
goto err;
}
-
close(
fd);
- return resolved;
+
__syscall(SYS_close,
fd);
+ return resolved
? strcpy(resolved, tmp) : strdup(tmp)
;
err:
err:
- if (alloc) free(resolved);
- close(fd);
+ __syscall(SYS_close, fd);
return 0;
}
return 0;
}