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Improve system call support

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This commit is contained in:
Justine Tunney 2021-08-25 21:35:58 -07:00
parent 63b867bd2f
commit 3085ac7837
65 changed files with 900 additions and 544 deletions
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33
libc/calls/fileexists.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/stat.h"
@ -26,26 +27,44 @@
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
#include "libc/zipos/zipos.internal.h"
/**
* Returns true if file exists at path.
*
* This function is equivalent to:
*
* struct stat st;
* return stat(path, &st) != -1;
*
* Please note that things which aren't strictly files, e.g. directories
* or sockets, could be considered files for the purposes of this
* function. The stat() function may be used to differentiate them.
*/
bool fileexists(const char *path) {
int rc, olderr;
int e;
struct stat st;
struct ZiposUri zipname;
uint16_t path16[PATH_MAX];
if (IsAsan() && !__asan_is_valid(path, 1)) return efault();
if (!IsWindows()) {
olderr = errno;
rc = __sys_fstatat(AT_FDCWD, path, &st, 0);
if (rc == -1 && (errno == ENOENT || errno == ENOTDIR)) {
errno = olderr;
if (weaken(__zipos_open) && weaken(__zipos_parseuri)(path, &zipname) != -1) {
e = errno;
if (weaken(__zipos_stat)(&zipname, &st) != -1) {
return true;
} else {
errno = e;
return false;
}
} else if (IsMetal()) {
return false;
} else if (!IsWindows()) {
e = errno;
if (__sys_fstatat(AT_FDCWD, path, &st, 0) != -1) {
return true;
} else {
errno = e;
return false;
}
return rc != -1;
} else {
if (__mkntpath(path, path16) == -1) return -1;
return GetFileAttributes(path16) != -1u;