1 //===-- Environment.cpp -----------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Utility/Environment.h"
11 
12 using namespace lldb_private;
13 
14 char *Environment::Envp::make_entry(llvm::StringRef Key,
15                                     llvm::StringRef Value) {
16   const size_t size = Key.size() + 1 /*=*/ + Value.size() + 1 /*\0*/;
17   char *Result = reinterpret_cast<char *>(
18       Allocator.Allocate(sizeof(char) * size, alignof(char)));
19   char *Next = Result;
20 
21   Next = std::copy(Key.begin(), Key.end(), Next);
22   *Next++ = '=';
23   Next = std::copy(Value.begin(), Value.end(), Next);
24   *Next++ = '\0';
25 
26   return Result;
27 }
28 
29 Environment::Envp::Envp(const Environment &Env) {
30   Data = reinterpret_cast<char **>(
31       Allocator.Allocate(sizeof(char *) * (Env.size() + 1), alignof(char *)));
32   char **Next = Data;
33   for (const auto &KV : Env)
34     *Next++ = make_entry(KV.first(), KV.second);
35   *Next++ = nullptr;
36 }
37 
38 Environment::Environment(const char *const *Env) {
39   if (!Env)
40     return;
41   while (*Env)
42     insert(*Env++);
43 }
44 
45 void Environment::insert(const_iterator first, const_iterator last) {
46   while (first != last) {
47     try_emplace(first->first(), first->second);
48     ++first;
49   }
50 }
51