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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
// Copyright 2017 Capitar IT Group BV <info@capitar.com>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include "core/nng_impl.h"
#ifdef NNG_PLATFORM_POSIX
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
// File support.
// nni_plat_file_put writes the named file, with the provided data,
// and the given size. If the file already exists it is overwritten.
// The permissions on the file should be limited to read and write
// access by the entity running the application only.
int
nni_plat_file_put(const char *name, const void *data, size_t len)
{
FILE *f;
int rv = 0;
if ((f = fopen(name, "wb")) == NULL) {
return (nni_plat_errno(errno));
}
if (fwrite(data, 1, len, f) != len) {
rv = nni_plat_errno(errno);
(void) unlink(name);
}
(void) fclose(f);
return (rv);
}
// nni_plat_file_get reads the entire named file, allocating storage
// to receive the data and returning the data and the size in the
// reference arguments.
int
nni_plat_file_get(const char *name, void **datap, size_t *lenp)
{
FILE * f;
struct stat st;
int rv = 0;
int len;
void * data;
if ((f = fopen(name, "rb")) == NULL) {
return (nni_plat_errno(errno));
}
if (stat(name, &st) != 0) {
rv = nni_plat_errno(errno);
(void) fclose(f);
return (rv);
}
len = st.st_size;
if ((data = nni_alloc(len)) == NULL) {
rv = NNG_ENOMEM;
goto done;
}
if (fread(data, 1, len, f) != len) {
rv = nni_plat_errno(errno);
nni_free(data, len);
goto done;
}
*datap = data;
*lenp = len;
done:
(void) fclose(f);
return (rv);
}
// nni_plat_file_delete deletes the named file.
int
nni_plat_file_delete(const char *name)
{
if (unlink(name) < 0) {
return (nni_plat_errno(errno));
}
return (0);
}
// nni_plat_dir_open attempts to "open a directory" for listing. The
// handle for further operations is returned in the first argument, and
// the directory name is supplied in the second.
int
nni_plat_dir_open(void **dirp, const char *name)
{
DIR *dir;
if ((dir = opendir(name)) == NULL) {
return (nni_plat_errno(errno));
}
*dirp = dir;
return (0);
}
int
nni_plat_dir_create(const char *name)
{
if (mkdir(name, S_IRWXU) != 0) {
if (errno == EEXIST) {
return (0);
}
return (nni_plat_errno(errno));
}
return (0);
}
int
nni_plat_dir_remove(const char *name)
{
if (rmdir(name) != 0) {
if (errno == ENOENT) {
return (0);
}
return (nni_plat_errno(errno));
}
return (0);
}
// nni_plat_dir_next gets the next directory entry. Each call returns
// a new entry (arbitrary order). When no more entries exist, it returns
// NNG_ENOENT.
int
nni_plat_dir_next(void *dir, const char **namep)
{
for (;;) {
struct dirent *ent;
if ((ent = readdir((DIR *) dir)) == NULL) {
return (NNG_ENOENT);
}
// Skip "." and ".." -- we would like to skip all
// directories, but that would require checking full
// paths.
if ((strcmp(ent->d_name, ".") == 0) ||
(strcmp(ent->d_name, "..") == 0)) {
continue;
}
*namep = ent->d_name;
return (0);
}
}
// nni_plat_dir_close closes the directory handle, freeing all
// resources associated with it.
void
nni_plat_dir_close(void *dir)
{
(void) closedir((DIR *) dir);
}
char *
nni_plat_temp_dir(void)
{
char *temp;
// POSIX says $TMPDIR is required.
if ((temp = getenv("TMPDIR")) != NULL) {
return (nni_strdup(temp));
}
return (nni_strdup("/tmp"));
}
char *
nni_plat_home_dir(void)
{
char *home;
// POSIX says that $HOME is *REQUIRED*. We could look in getpwuid,
// but realistically this is simply not required.
if ((home = getenv("HOME")) != NULL) {
return (nni_strdup(home));
}
return (NULL);
}
char *
nni_plat_join_dir(const char *prefix, const char *suffix)
{
char * newdir;
size_t len;
len = strlen(prefix) + strlen(suffix) + 2;
newdir = nni_alloc(strlen(prefix) + strlen(suffix) + 2);
if (newdir != NULL) {
(void) snprintf(newdir, len, "%s/%s", prefix, suffix);
}
return (newdir);
}
#endif // NNG_PLATFORM_POSIX
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