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/* SPDX-License-Identifier: ISC */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include "util.h"
FILE *fopenat(int dirfd, const char *filename, const char *mode)
{
const char *ptr = mode;
int fd, flags = 0;
FILE *fp;
switch (*(ptr++)) {
case 'r':
flags = O_RDONLY;
break;
case 'w':
flags = O_WRONLY | O_CREAT | O_TRUNC;
break;
case 'a':
flags = O_WRONLY | O_CREAT | O_APPEND;
break;
default:
errno = EINVAL;
return NULL;
}
if (*ptr == '+') {
flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
++ptr;
}
if (*ptr == 'b')
++ptr;
if (*ptr != '\0') {
errno = EINVAL;
return NULL;
}
fd = openat(dirfd, filename, flags, 0644);
if (fd == -1)
return NULL;
fp = fdopen(fd, mode);
if (fp == NULL)
close(fd);
return fp;
}
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