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Fix writev() on the New Technology (#117)

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This commit is contained in:
Justine Tunney 2021-03-09 11:21:08 -08:00
parent 6cd1037692
commit 83d0c3b870
8 changed files with 113 additions and 31 deletions
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44
libc/calls/read-nt.c
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@ -26,35 +26,37 @@
#include "libc/nt/struct/overlapped.h"
#include "libc/sysv/errfuns.h"
static textwindows ssize_t sys_read_nt_impl(struct Fd *fd, void *data,
size_t size, ssize_t offset) {
uint32_t got;
struct NtOverlapped overlap;
if (ReadFile(fd->handle, data, clampio(size), &got,
offset2overlap(offset, &overlap))) {
return got;
} else if (GetLastError() == kNtErrorBrokenPipe) {
return 0;
} else {
return __winerr();
}
}
textwindows ssize_t sys_read_nt(struct Fd *fd, const struct iovec *iov,
size_t iovlen, ssize_t opt_offset) {
ssize_t rc;
uint32_t size;
size_t i, total;
uint32_t got, size;
struct NtOverlapped overlap;
while (iovlen && !iov[0].iov_len) iov++, iovlen--;
if (iovlen) {
for (total = i = 0; i < iovlen; ++i) {
size = clampio(iov[i].iov_len);
if (ReadFile(fd->handle, iov[i].iov_base, size, &got,
offset2overlap(opt_offset, &overlap))) {
total += got;
if (opt_offset != -1) opt_offset += got;
if (got < iov[i].iov_len) break;
} else if (GetLastError() == kNtErrorBrokenPipe) {
break; /* read() doesn't EPIPE lool */
} else {
return __winerr();
}
if (!iov[i].iov_len) continue;
rc = sys_read_nt_impl(fd, iov[i].iov_base, iov[i].iov_len, opt_offset);
if (rc == -1) return -1;
total += rc;
if (opt_offset != -1) opt_offset += rc;
if (rc < iov[i].iov_len) break;
}
return total;
} else {
if (ReadFile(fd->handle, NULL, 0, &got,
offset2overlap(opt_offset, &overlap))) {
return got;
} else if (GetLastError() == kNtErrorBrokenPipe) {
return 0;
} else {
return __winerr();
}
return sys_read_nt_impl(fd, NULL, 0, opt_offset);
}
}