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