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#include <sys/types.h>
#include <sys/stat.h>
#include <linux/limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include "io.h"
int stream_open(struct stream *in)
{
struct stat st;
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP;
char *dname = NULL;
int ret = 0;
if (!in || in->fd > 0 || !in->name) {
ret = EINVAL;
goto err;
}
if (in->out) {
char *tmp[2];
tmp[0] = strdup(in->name);
tmp[1] = dirname(tmp[0]);
dname = strdup(tmp[1]);
free(tmp[0]);
if (stat(dname, &st)) {
ret = errno;
/* TODO: error message */
goto err;
}
if(!(st.st_mode & S_IFDIR)) {
ret = EINVAL;
/* TODO: error message */
goto err;
}
if (!stat(in->name, &st)) {
if (!(st.st_mode & S_IFREG)) {
ret = EINVAL;
/* TODO: error message */
goto err;
}
mode = st.st_mode;
}
} else if (stat(in->name, &st)) {
ret = errno;
/* TODO: error message */
goto err;
} else if (!(st.st_mode & S_IFREG) || !st.st_size || (st.st_size % in->stride)) {
ret = EINVAL;
/* TODO: error message */
goto err;
} else {
in->n = st.st_size / in->stride;
}
if (in->out) {
in->fd = open(dname, O_TMPFILE | O_WRONLY, mode);
if (in->fd < 0) {
ret = errno;
/* TODO: error message */
goto err;
}
if (ftruncate(in->fd, in->stride * in->n)) {
ret = errno;
/* TODO: error message */
goto err;
}
} else {
in->fd = open(in->name, O_RDONLY | O_NOATIME);
if (in->fd < 0) {
ret = errno;
/* TODO: error message */
goto err;
}
}
err:
free(dname);
return ret;
}
int stream_close(struct stream *in)
{
int ret = 0;
if (!in || in->fd < 0) {
ret = EINVAL;
goto early_err;
}
if (!in->out) {
goto out;
}
if (in->name) {
char path[PATH_MAX];
struct stat st;
snprintf(path, PATH_MAX, "/proc/self/fd/%i", in->fd);
if (!stat(in->name, &st)) {
if (st.st_mode & S_IFREG) {
unlink(in->name);
} else {
ret = EINVAL;
/* TODO: error message */
goto err;
}
}
if (linkat(AT_FDCWD, path, AT_FDCWD, in->name, AT_SYMLINK_FOLLOW)) {
ret = errno;
/* TODO: error message */
goto err;
}
} else {
ret = EINVAL;
goto err;
}
out:
err:
close(in->fd);
in->fd = -1;
early_err:
return ret;
}
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