c-ipfs/os/utils.c
John Jones 50ffade515 More work on storage and cleanup
Added flatfs, as well as fixed some memory leaks. Valgrind across tests
now reports 0 memory leaks.
2016-11-28 08:09:00 -05:00

72 lines
1.7 KiB
C

#include "ipfs/os/utils.h"
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#include <stdio.h>
/**
* get an environment varible from the os
* @param variable the variable to look for
* @returns the results
*/
char* os_utils_getenv(const char* variable) {
return getenv(variable);
}
/**
* returns the user's home directory
* @returns the home directory
*/
char* os_utils_get_homedir() {
struct passwd *pw = getpwuid(getuid());
return pw->pw_dir;
}
/**
* join 2 pieces of a filepath, being careful about the slashes
* @param root the root part
* @param extension what should be concatenated
* @param results where to put the results
* @param max_len throw an error if the total is longer than max_len
*/
int os_utils_filepath_join(const char* root, const char* extension, char* results, unsigned long max_len) {
if (strlen(root) + strlen(extension) + 1 > max_len)
return 0;
strncpy(results, root, strlen(root) + 1);
// one of these should have a slash. If not, add one
if (root[strlen(root)-1] != '/' && extension[0] != '/') {
results[strlen(root)] = '/';
results[strlen(root)+1] = 0;
}
strncat(results, extension, strlen(extension)+1);
return 1;
}
int os_utils_file_exists(const char* file_name) {
if (access(file_name, F_OK) != -1)
return 1;
return 0;
}
int os_utils_directory_exists(const char* directory_name) {
if (access(directory_name, F_OK) != -1)
return 1;
return 0;
}
int os_utils_directory_writeable(const char* path) {
int result = access(path, W_OK);
return result == 0;
}
int os_utils_file_size(const char* path) {
// open file
FILE* in_file = fopen(path, "r");
// determine size
fseek(in_file, 0L, SEEK_END);
size_t file_size = ftell(in_file);
fclose(in_file);
return file_size;
}