1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "crazy_linker_search_path_list.h" 6 7 #include <string.h> 8 9 #include "crazy_linker_debug.h" 10 #include "crazy_linker_system.h" 11 12 namespace crazy { 13 14 void SearchPathList::Reset() { 15 list_.Resize(0); 16 env_list_.Resize(0); 17 full_path_.Resize(0); 18 } 19 20 void SearchPathList::ResetFromEnv(const char* var_name) { 21 Reset(); 22 const char* env = GetEnv(var_name); 23 if (env && *env) 24 env_list_ = env; 25 } 26 27 void SearchPathList::AddPaths(const char* list, const char* list_end) { 28 // Append a column to the current list, if necessary 29 if (list_.size() > 0 && list_[list_.size() - 1] != ':') 30 list_ += ':'; 31 list_.Append(list, list_end - list); 32 } 33 34 const char* SearchPathList::FindFile(const char* file_name) { 35 // Sanity checks. 36 if (!file_name || !*file_name) 37 return NULL; 38 39 LOG("%s: Looking for %s\n", __FUNCTION__, file_name); 40 41 // Build full list by appending the env_list_ after the regular one. 42 String full_list = list_; 43 if (env_list_.size() > 0) { 44 if (full_list.size() > 0 && full_list[full_list.size() - 1] != ':') 45 full_list += ':'; 46 full_list += env_list_; 47 } 48 49 // Iterate over all items in the list. 50 const char* p = full_list.c_str(); 51 const char* end = p + full_list.size(); 52 53 while (p < end) { 54 // compute current list item, and next item start at the same time. 55 const char* item = p; 56 const char* item_end = 57 reinterpret_cast<const char*>(memchr(p, ':', end - p)); 58 if (item_end) 59 p = item_end + 1; 60 else { 61 item_end = end; 62 p = end; 63 } 64 65 full_path_.Assign(item, item_end - item); 66 67 // Add trailing directory separator if needed. 68 if (full_path_.size() > 0 && full_path_[full_path_.size() - 1] != '/') 69 full_path_ += '/'; 70 71 full_path_ += file_name; 72 73 if (PathIsFile(full_path_.c_str())) { 74 LOG(" FOUND %s\n", full_path_.c_str()); 75 return full_path_.c_str(); 76 } else 77 LOG(" skip %s\n", full_path_.c_str()); 78 } 79 80 return NULL; 81 } 82 83 } // namespace crazy 84
