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/*
This file is part of ethash.
ethash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ethash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ethash. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file io_posix.c
* @author Lefteris Karapetsas <lefteris@ethdev.com>
* @date 2015
*/
#include "io.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <libgen.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pwd.h>
FILE* ethash_fopen(char const* file_name, char const* mode)
{
return fopen(file_name, mode);
}
char* ethash_strncat(char* dest, size_t dest_size, char const* src, size_t count)
{
return strlen(dest) + count + 1 <= dest_size ? strncat(dest, src, count) : NULL;
}
bool ethash_mkdir(char const* dirname)
{
int rc = mkdir(dirname, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
return rc != -1 || errno == EEXIST;
}
int ethash_fileno(FILE *f)
{
return fileno(f);
}
char* ethash_io_create_filename(
char const* dirname,
char const* filename,
size_t filename_length
)
{
size_t dirlen = strlen(dirname);
size_t dest_size = dirlen + filename_length + 1;
if (dirname[dirlen] != '/') {
dest_size += 1;
}
char* name = malloc(dest_size);
if (!name) {
return NULL;
}
name[0] = '\0';
ethash_strncat(name, dest_size, dirname, dirlen);
if (dirname[dirlen] != '/') {
ethash_strncat(name, dest_size, "/", 1);
}
ethash_strncat(name, dest_size, filename, filename_length);
return name;
}
bool ethash_file_size(FILE* f, size_t* ret_size)
{
struct stat st;
int fd;
if ((fd = fileno(f)) == -1 || fstat(fd, &st) != 0) {
return false;
}
*ret_size = st.st_size;
return true;
}
bool ethash_get_default_dirname(char* strbuf, size_t buffsize)
{
static const char dir_suffix[] = ".ethash/";
strbuf[0] = '\0';
char* home_dir = getenv("HOME");
if (!home_dir || strlen(home_dir) == 0)
{
struct passwd* pwd = getpwuid(getuid());
if (pwd)
home_dir = pwd->pw_dir;
}
size_t len = strlen(home_dir);
if (!ethash_strncat(strbuf, buffsize, home_dir, len)) {
return false;
}
if (home_dir[len] != '/') {
if (!ethash_strncat(strbuf, buffsize, "/", 1)) {
return false;
}
}
return ethash_strncat(strbuf, buffsize, dir_suffix, sizeof(dir_suffix));
}
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