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#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string>
#include <sstream>
#include <vector>
#include <dirent.h>
#include <sys/stat.h>
#include "file_util.h"
using namespace std;
/**
* Adapted from an answer by "Evan Teran" from this stack overflow question:
* http://stackoverflow.com/questions/236129/split-a-string-in-c
*/
vector<string> split(const string &s, char delim) {
vector<string> elems;
stringstream ss(s);
string item;
while (getline(ss, item, delim)) {
if (!item.empty()) {
elems.push_back(item);
}
}
return elems;
}
/**
* Adapted from an answer by "dash-tom-bang" from this stack overflow question:
* http://stackoverflow.com/questions/5772992/get-relative-path-from-two-absolute-paths
*/
string get_relative_path(const string &to, const string &from) {
vector<string> to_dirs = split(to, '/');
vector<string> from_dirs = split(from, '/');
string output;
output.reserve(to.size());
vector<string>::const_iterator to_it = to_dirs.begin(),
to_end = to_dirs.end(),
from_it = from_dirs.begin(),
from_end = from_dirs.end();
while ((to_it != to_end) && (from_it != from_end) && *to_it == *from_it) {
++to_it;
++from_it;
}
while (from_it != from_end) {
output += "../";
++from_it;
}
while (to_it != to_end) {
output += *to_it;
++to_it;
if (to_it != to_end) {
output += "/";
}
}
return output;
}
/**
* Returns a string without '..' and '.'
*
* Preconditions: path must be an absolute path
* Postconditions: if path is empty or not an absolute path, return original
* path, otherwise, return path after resolving '..' and '.'
*/
string get_canonicalized_path(const string &path) {
if (path.empty() || path[0] != '/') {
return path;
}
vector<string> parts = split(path, '/');
vector<string> canonicalized_path;
vector<string>::const_iterator parts_it = parts.begin(),
parts_end = parts.end();
while (parts_it != parts_end) {
if (*parts_it == ".." && !canonicalized_path.empty()) {
canonicalized_path.pop_back();
}
else if (*parts_it != "." && *parts_it != "..") {
canonicalized_path.push_back(*parts_it);
}
++parts_it;
}
vector<string>::const_iterator path_it = canonicalized_path.begin(),
path_end = canonicalized_path.end();
string output;
output.reserve(path.size());
output += "/";
while (path_it != path_end) {
output += *path_it;
++path_it;
if (path_it != path_end) {
output += "/";
}
}
return output;
}
/**
* Adapted from an answer by "Mark" from this stack overflow question:
* http://stackoverflow.com/questions/675039/how-can-i-create-directory-tree-in-c-linux
*/
bool mkpath(const string &path) {
bool success = false;
int ret = mkdir(path.c_str(), 0775);
if(ret == -1) {
switch(errno) {
case ENOENT:
if(mkpath(path.substr(0, path.rfind('/'))))
success = 0 == mkdir(path.c_str(), 0775);
else
success = false;
break;
case EEXIST:
success = true;
break;
default:
success = false;
break;
}
}
else {
success = true;
}
return success;
}
/**
* Adapted from an answer by "asveikau" from this stack overflow question:
* http://stackoverflow.com/questions/2256945/removing-a-non-empty-directory-programmatically-in-c-or-c
*/
bool rmpath(const char* path) {
DIR *d = opendir(path);
size_t path_len = strlen(path);
int r = -1;
if (d) {
struct dirent *p;
r = 0;
while (!r && (p=readdir(d))) {
int r2 = -1;
char *buf;
size_t len;
/* Skip the names "." and ".." as we don't want to recurse on them. */
if (!strcmp(p->d_name, ".") || !strcmp(p->d_name, "..")) {
continue;
}
len = path_len + strlen(p->d_name) + 2;
buf = (char*)malloc(len);
if (buf) {
struct stat statbuf;
snprintf(buf, len, "%s/%s", path, p->d_name);
if (!stat(buf, &statbuf)) {
if (S_ISDIR(statbuf.st_mode)) {
r2 = rmpath(buf);
}
else {
r2 = unlink(buf);
}
}
free(buf);
}
r = r2;
}
closedir(d);
}
if (!r) {
r = rmdir(path);
}
return r;
}
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