c-ipfs/os/utils.c

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#include "ipfs/os/utils.h"
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#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
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/**
* get an environment varible from the os
* @param variable the variable to look for
* @returns the results
*/
char* os_utils_getenv(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;
}
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/**
* 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(char* root, char* extension, char* results, unsigned long max_len) {
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//TODO: implement slash checks
if (strlen(root) + strlen(extension) + 1 > max_len)
return 0;
strncpy(results, root, strlen(root) + 1);
strncat(results, extension, strlen(extension)+1);
return 1;
}
int os_utils_file_exists(char* file_name) {
if (access(file_name, F_OK) != -1)
return 1;
return 0;
}
int os_utils_directory_writeable(char* path) {
int result = access("/root/", W_OK);
return result == 0;
}