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/*
* Copyright (c) 2022 Egor Tensin <Egor.Tensin@gmail.com>
* This file is part of the "cimple" project.
* For details, see https://github.com/egor-tensin/cimple.
* Distributed under the MIT License.
*/
#include "file.h"
#include "compiler.h"
#include "log.h"
#include <fcntl.h>
#include <ftw.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
static int unlink_cb(const char *fpath, UNUSED const struct stat *sb, UNUSED int typeflag,
UNUSED struct FTW *ftwbuf)
{
int ret = 0;
ret = remove(fpath);
if (ret < 0) {
log_errno("remove");
return ret;
}
return ret;
}
int rm_rf(const char *dir)
{
log("Recursively removing directory: %s\n", dir);
return nftw(dir, unlink_cb, 64, FTW_DEPTH | FTW_PHYS);
}
int my_chdir(const char *dir, char **old)
{
int ret = 0;
if (old) {
*old = get_current_dir_name();
if (!*old) {
log_errno("get_current_dir_name");
return -1;
}
}
ret = chdir(dir);
if (ret < 0) {
log_errno("chdir");
goto free_old;
}
return ret;
free_old:
if (old)
free(*old);
return ret;
}
char *my_readlink(const char *path)
{
size_t current_size = 256;
char *buf = NULL;
while (1) {
char *tmp_buf = realloc(buf, current_size);
if (!tmp_buf) {
log_errno("realloc");
goto free;
}
buf = tmp_buf;
ssize_t res = readlink(path, buf, current_size);
if (res < 0) {
log_errno("readlink");
goto free;
}
if ((size_t)res == current_size) {
current_size *= 2;
continue;
}
buf[res] = '\0';
break;
}
return buf;
free:
free(buf);
return NULL;
}
int file_dup(int fd)
{
int ret = 0;
ret = fcntl(fd, F_DUPFD_CLOEXEC, 0);
if (ret < 0) {
log_errno("fcntl");
return ret;
}
return ret;
}
void file_close(int fd)
{
log_errno_if(close(fd), "close");
}
int file_exists(const char *path)
{
struct stat stat;
int ret = lstat(path, &stat);
return !ret && S_ISREG(stat.st_mode);
}
int file_read(int fd, unsigned char **_contents, size_t *_size)
{
size_t alloc_size = 256;
unsigned char *contents = NULL;
size_t size = 0;
while (1) {
unsigned char *tmp_contents = realloc(contents, alloc_size);
if (!tmp_contents) {
log_errno("realloc");
free(contents);
return -1;
}
contents = tmp_contents;
ssize_t read_size = read(fd, contents + size, alloc_size - size);
if (read_size < 0) {
log_errno("read");
free(contents);
return read_size;
}
if (!read_size) {
*_contents = contents;
*_size = size;
return 0;
}
size += read_size;
if (size == alloc_size) {
alloc_size *= 2;
}
}
}
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