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#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <frg/vector.hpp>
#include <mlibc/allocator.hpp>
#include <mlibc/debug.hpp>
#include <mlibc/posix-sysdeps.hpp>
#include <bits/ensure.h>
ssize_t readv(int fd, const struct iovec *iovs, int iovc) {
ssize_t read_bytes = 0;
auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_readv, -1);
if (int e = sysdep(fd, iovs, iovc, &read_bytes); e) {
errno = e;
return -1;
}
return read_bytes;
}
ssize_t writev(int fd, const struct iovec *iovs, int iovc) {
__ensure(iovc);
ssize_t written = 0;
size_t bytes = 0;
for(int i = 0; i < iovc; i++) {
if(SSIZE_MAX - bytes < iovs[i].iov_len) {
errno = EINVAL;
return -1;
}
bytes += iovs[i].iov_len;
}
frg::vector<char, MemoryAllocator> buffer{getAllocator()};
buffer.resize(bytes);
size_t to_copy = bytes;
char *bp = buffer.data();
for(int i = 0; i < iovc; i++) {
size_t copy = frg::min(iovs[i].iov_len, to_copy);
bp = (char *)mempcpy((void *)bp, (void *)iovs[i].iov_base, copy);
to_copy -= copy;
if(to_copy == 0)
break;
}
written = write(fd, buffer.data(), bytes);
return written;
}
ssize_t preadv(int, const struct iovec *, int, off_t) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
ssize_t pwritev(int, const struct iovec *, int, off_t) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
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