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