From e02797df909c686fe2fcf1afca15883cbe071a68 Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi.kivity@gmail.com>
Date: Sun, 6 Jan 2013 17:12:18 +0200
Subject: [PATCH] libc: implement realpath()
Assumes no symlinks, cwd == /.
---
libc/libc.cc | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/libc/libc.cc b/libc/libc.cc
index df5bc3e94..88119b1cd 100644
--- a/libc/libc.cc
+++ b/libc/libc.cc
@@ -1,5 +1,8 @@
#include "libc.hh"
#include <stdio.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <boost/algorithm/string/split.hpp>
int libc_error(int err)
{
@@ -15,3 +18,33 @@ int* __errno_location()
{
return &errno;
}
+
+char* realpath(const char* path, char* resolved_path)
+{
+ // assumes cwd == /
+ std::vector<std::string> components;
+ std::string spath = path;
+ boost::split(components, spath, [] (char c) { return c == '/'; });
+ std::vector<std::string> tmp;
+ for (auto c : components) {
+ if (c == "" || c == ".") {
+ continue;
+ } else if (c == "..") {
+ if (!tmp.empty()) {
+ tmp.pop_back();
+ }
+ } else {
+ tmp.push_back(c);
+ }
+ }
+ std::string ret;
+ for (auto c : tmp) {
+ ret += "/" + c;
+ }
+ ret = ret.substr(0, PATH_MAX - 1);
+ if (!resolved_path) {
+ resolved_path = static_cast<char*>(malloc(ret.size() + 1));
+ }
+ strcpy(resolved_path, ret.c_str());
+ return resolved_path;
+}
--
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