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[libFuzzer] use custom stol; also introduce __libfuzzer_is_present so that users can check for its presence.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257848 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2016-01-15 00:17:37 +00:00
parent 16b8b2d9ac
commit 9039b1ff4e
1 changed files with 17 additions and 1 deletions
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18
lib/Fuzzer/FuzzerDriver.cpp
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@ -23,6 +23,10 @@
#include <algorithm>
#include <iterator>
// This function should be present in the libFuzzer so that the client
// binary can test for its existence.
extern "C" __attribute__((used)) void __libfuzzer_is_present() {}
namespace fuzzer {
// Program arguments.
@ -93,6 +97,18 @@ static const char *FlagValue(const char *Param, const char *Name) {
return nullptr;
}
// Avoid calling stol as it triggers a bug in clang/glibc build.
static long MyStol(const char *Str) {
long Res = 0;
for (size_t i = 0; Str[i]; i++) {
char Ch = Str[i];
if (Ch < '0' || Ch > '9')
return Res;
Res = Res * 10 + (Ch - '0');
}
return Res;
}
static bool ParseOneFlag(const char *Param) {
if (Param[0] != '-') return false;
if (Param[1] == '-') {
@ -108,7 +124,7 @@ static bool ParseOneFlag(const char *Param) {
const char *Str = FlagValue(Param, Name);
if (Str) {
if (FlagDescriptions[F].IntFlag) {
int Val = std::stol(Str);
int Val = MyStol(Str);
*FlagDescriptions[F].IntFlag = Val;
if (Flags.verbosity >= 2)
Printf("Flag: %s %d\n", Name, Val);;