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#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "log.h"
#include "util.h"
#ifndef O_TMPFILE
#define __O_TMPFILE 020000000
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY)
#endif
using namespace std;
int make_tempfile(const string &contents)
{
int fd = open("/tmp", O_RDWR | O_TMPFILE, 0600);
if (fd == -1) {
char filename[] = "/tmp/cubemap.XXXXXX";
mode_t old_umask = umask(077);
fd = mkstemp(filename);
if (fd == -1) {
log_perror("mkstemp");
return -1;
}
umask(old_umask);
if (unlink(filename) == -1) {
log_perror("unlink");
// Can still continue.
}
}
const char *ptr = contents.data();
size_t to_write = contents.size();
while (to_write > 0) {
ssize_t ret = write(fd, ptr, to_write);
if (ret == -1) {
log_perror("write");
safe_close(fd);
return -1;
}
ptr += ret;
to_write -= ret;
}
return fd;
}
bool read_tempfile_and_close(int fd, string *contents)
{
bool ok = read_tempfile(fd, contents);
safe_close(fd); // Implicitly deletes the file.
return ok;
}
bool read_tempfile(int fd, string *contents)
{
ssize_t ret, has_read;
off_t len = lseek(fd, 0, SEEK_END);
if (len == -1) {
log_perror("lseek");
return false;
}
contents->resize(len);
if (lseek(fd, 0, SEEK_SET) == -1) {
log_perror("lseek");
return false;
}
has_read = 0;
while (has_read < len) {
ret = read(fd, &((*contents)[has_read]), len - has_read);
if (ret == -1) {
log_perror("read");
return false;
}
if (ret == 0) {
log(ERROR, "Unexpected EOF!");
return false;
}
has_read += ret;
}
return true;
}
int safe_close(int fd)
{
int ret;
do {
ret = close(fd);
} while (ret == -1 && errno == EINTR);
if (ret == -1) {
log_perror("close()");
}
return ret;
}
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