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// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "util.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <vector>
#ifdef _WIN32
#include <direct.h> // _mkdir
#endif
void Fatal(const char* msg, ...) {
va_list ap;
fprintf(stderr, "ninja: FATAL: ");
va_start(ap, msg);
vfprintf(stderr, msg, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(1);
}
void Warning(const char* msg, ...) {
va_list ap;
fprintf(stderr, "ninja: WARNING: ");
va_start(ap, msg);
vfprintf(stderr, msg, ap);
va_end(ap);
fprintf(stderr, "\n");
}
void Error(const char* msg, ...) {
va_list ap;
fprintf(stderr, "ninja: error: ");
va_start(ap, msg);
vfprintf(stderr, msg, ap);
va_end(ap);
fprintf(stderr, "\n");
}
bool CanonicalizePath(string* path, string* err) {
// WARNING: this function is performance-critical; please benchmark
// any changes you make to it.
// We don't want to allocate memory if necessary; a previous version
// of this function modified |path| as it went, which meant we
// needed to keep a copy of it around for including in a potential
// error message.
//
// Instead, we find all path components within the path, then fix
// them up to eliminate "foo/.." pairs and "." components. Finally,
// we overwrite path with these new substrings (since the path only
// ever gets shorter, we can just use memmove within it).
const int kMaxPathComponents = 20;
const char* starts[kMaxPathComponents]; // Starts of path components.
int lens[kMaxPathComponents]; // Lengths of path components.
int parts_count = 0; // Number of entries in starts/lens.
int slash_count = 0; // Number of components in the original path.
for (string::size_type start = 0; start < path->size(); ++start) {
string::size_type end = path->find('/', start);
if (end == string::npos)
end = path->size();
if (end > start) {
if (parts_count == kMaxPathComponents) {
*err = "can't canonicalize path '" + *path + "'; too many "
"path components";
return false;
}
starts[parts_count] = path->data() + start;
lens[parts_count] = end - start;
++parts_count;
}
++slash_count;
start = end;
}
int i = 0;
while (i < parts_count) {
const char* start = starts[i];
int len = lens[i];
if (start[0] == '.') {
int strip_components = 0;
if (len == 1) {
// "."; strip this component.
strip_components = 1;
} else if (len == 2 && start[1] == '.') {
// ".."; strip this and the previous component.
if (i == 0) {
*err = "can't canonicalize path '" + *path + "' that reaches "
"above its directory";
return false;
}
strip_components = 2;
--i;
}
if (strip_components) {
// Shift arrays backwards to remove bad path components.
int entries_to_move = parts_count - i - strip_components;
memmove(starts + i, starts + i + strip_components,
sizeof(starts[0]) * entries_to_move);
memmove(lens + i, lens + i + strip_components,
sizeof(lens[0]) * entries_to_move);
parts_count -= strip_components;
continue;
}
}
++i;
}
if (parts_count == slash_count)
return true; // Nothing to do.
char* p = (char*)path->data();
for (i = 0; i < parts_count; ++i) {
if (p > path->data())
*p++ = '/';
int len = lens[i];
memmove(p, starts[i], len);
p += len;
}
path->resize(p - path->data());
return true;
}
int MakeDir(const string& path) {
#ifdef _WIN32
return _mkdir(path.c_str());
#else
return mkdir(path.c_str(), 0777);
#endif
}
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