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Rewrite special file handling on Windows

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This change gets GNU grep working. What caused it to not work, is it
wouldn't write to an output file descriptor when its dev/ino equaled
/dev/null's. So now we invent special dev/ino values for these files
This commit is contained in:
Justine Tunney 2023-10-14 01:06:00 -07:00
parent aca2261cda
commit 2db2f40a98
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
53 changed files with 485 additions and 299 deletions
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20
libc/calls/mkntpath.c
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@ -16,7 +16,6 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/ntmagicpaths.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
@ -36,24 +35,6 @@ static inline int IsAlpha(int c) {
return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
}
textwindows static const char *FixNtMagicPath(const char *path,
unsigned flags) {
const struct NtMagicPaths *mp = &kNtMagicPaths;
asm("" : "+r"(mp));
if (!IsSlash(path[0])) return path;
if (strcmp(path, mp->devtty) == 0) {
if ((flags & O_ACCMODE) == O_RDONLY) {
return mp->conin;
} else if ((flags & O_ACCMODE) == O_WRONLY) {
return mp->conout;
}
}
if (strcmp(path, mp->devnull) == 0) return mp->nul;
if (strcmp(path, mp->devstdin) == 0) return mp->conin;
if (strcmp(path, mp->devstdout) == 0) return mp->conout;
return path;
}
textwindows size_t __normntpath(char16_t *p, size_t n) {
size_t i, j;
for (j = i = 0; i < n; ++i) {
@ -116,7 +97,6 @@ textwindows int __mkntpath2(const char *path,
if (!path || (IsAsan() && !__asan_is_valid_str(path))) {
return efault();
}
path = FixNtMagicPath(path, flags);
size_t x, z;
char16_t *p = path16;