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#include "../git-compat-util.h"
#include "../wrapper.h"
ssize_t git_writev(int fd, const struct iovec *iov, int iovcnt)
{
size_t total_written = 0;
size_t sum = 0;
/*
* According to writev(3p), the syscall shall error with EINVAL in case
* the sum of `iov_len` overflows `ssize_t`.
*/
for (int i = 0; i < iovcnt; i++) {
if (iov[i].iov_len > maximum_signed_value_of_type(ssize_t) ||
iov[i].iov_len + sum > maximum_signed_value_of_type(ssize_t)) {
errno = EINVAL;
return -1;
}
sum += iov[i].iov_len;
}
for (int i = 0; i < iovcnt; i++) {
const char *bytes = iov[i].iov_base;
size_t iovec_written = 0;
while (iovec_written < iov[i].iov_len) {
ssize_t bytes_written = xwrite(fd, bytes + iovec_written,
iov[i].iov_len - iovec_written);
if (bytes_written < 0) {
if (total_written)
goto out;
return bytes_written;
}
if (!bytes_written)
goto out;
iovec_written += bytes_written;
total_written += bytes_written;
}
}
out:
return (ssize_t) total_written;
}
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