c-libp2p/os/utils.c

220 lines
5.3 KiB
C
Raw Normal View History

#include "libp2p/os/utils.h"
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef __MINGW32__
#include <pwd.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
2017-08-24 18:30:04 +00:00
#include <time.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);
}
/**
* set an environment variable in the os
* @param variable the variable to set
* @param value the value to assign to the variable
* @param overwrite passing a non-zero will allow an existing value to be overwritten
* @returns true(1) on success
*/
int os_utils_setenv(const char* variable, const char* value, int overwrite) {
#ifdef __MINGW32__
return 0;
#else
setenv(variable, value, overwrite);
return 1;
#endif
}
/**
* returns the user's home directory
* @returns the home directory
*/
char* os_utils_get_homedir() {
#ifndef __MINGW32__
struct passwd *pw = getpwuid(getuid());
return pw->pw_dir;
#endif
return ".";
}
/**
* 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;
}
/***
* See if the passed in directory exists, and is a directory
* @param directory_name the name to examine
* @returns true(1) if it exists, false(0) if not
*/
int os_utils_directory_exists(const char* directory_name) {
if (access(directory_name, F_OK) != -1 && os_utils_is_directory(directory_name))
return 1;
return 0;
}
/**
* Determine if the passed in file name is a directory
* @param file_name the file name
* @returns true(1) if file_name is a directory
*/
int os_utils_is_directory(const char* file_name) {
struct stat path_stat;
stat(file_name, &path_stat);
return S_ISDIR(path_stat.st_mode) != 0;
}
int os_utils_split_filename(const char* in, char** path, char** filename) {
int len = strlen(in);
char* pos = strrchr(in, '/');
if (pos != NULL) {
pos++;
*path = (char*)malloc((pos - in) + 1);
strncpy(*path, in, pos-in-1);
(*path)[pos-in-1] = 0;
*filename = (char*)malloc(len - (pos-in) + 1);
strcpy(*filename, pos);
(*filename)[len - (pos-in)] = 0;
} else {
*filename = (char*)malloc(len+1);
strcpy(*filename, in);
}
return 1;
}
struct FileList* os_utils_list_directory(const char* path) {
DIR* dp;
struct dirent *ep;
struct FileList* first = NULL;
struct FileList* last = NULL;
struct FileList* next = NULL;
dp = opendir(path);
if (dp != NULL) {
while ( (ep = readdir(dp)) ) {
if (strcmp(ep->d_name, ".") != 0 && strcmp(ep->d_name, "..") != 0) {
// grab the data
next = (struct FileList*)malloc(sizeof(struct FileList));
next->file_name = malloc(strlen(ep->d_name) + 1);
strcpy(next->file_name, ep->d_name);
next->next = NULL;
// put it in the appropriate spot
if (first == NULL) {
first = next;
last = next;
} else {
last->next = next;
last = next;
}
} // not dealing with . or ..
} // while
closedir(dp);
}
return first;
}
int os_utils_free_file_list(struct FileList* first) {
if (first != NULL) {
struct FileList* next = first;
struct FileList* last = NULL;
while (next != NULL) {
last = next->next;
if (next->file_name != NULL) {
free(next->file_name);
}
free(next);
next = last;
}
}
return 1;
}
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) {
size_t file_size = 0;
// open file
FILE* in_file = fopen(path, "r");
if (in_file == NULL)
return 0;
// determine size
fseek(in_file, 0L, SEEK_END);
file_size = ftell(in_file);
fclose(in_file);
return file_size;
}
2017-08-24 18:30:04 +00:00
/***
* Get the current time in GMT (UTC) as seconds since epoch
* @returns seconds since epoch
*/
unsigned long long os_utils_gmtime() {
time_t local = time(NULL);
struct tm *gmt = gmtime(&local);
return (unsigned long long)mktime(gmt);
}
/**
* String search for platforms without it
* @haystack where to look
* @needle what you're looking for
* @len when to stop looking
* @returns a pointer to where the needle is found in the haystack or NULL if not found
*/
char *strnstr(const char *haystack, const char *needle, size_t len)
{
int i;
size_t needle_len;
if (0 == (needle_len = strnlen(needle, len)))
return (char *)haystack;
for (i=0; i<=(int)(len-needle_len); i++)
{
if ((haystack[0] == needle[0]) &&
(0 == strncmp(haystack, needle, needle_len)))
return (char *)haystack;
haystack++;
}
return NULL;
}