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* Use low-level unix I/O interface since we're on Unix. 

* Don't use variable length arrays (replaced with alloca)

llvm-svn: 17901
This commit is contained in:
Reid Spencer 2004-11-16 17:14:08 +00:00
parent 7391dde138
commit 1b13a7cdb8
1 changed files with 17 additions and 7 deletions
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24
llvm/lib/System/Unix/Path.cpp
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@ -17,6 +17,7 @@
//===----------------------------------------------------------------------===//
#include <llvm/Config/config.h>
#include <llvm/Config/alloca.h>
#include "Unix.h"
#include <sys/stat.h>
#include <fcntl.h>
@ -157,20 +158,29 @@ Path::getBasename() const {
bool Path::hasMagicNumber(const std::string &Magic) const {
size_t len = Magic.size();
char buf[ 1 + len];
std::ifstream f(path.c_str());
f.read(buf, len);
assert(len < 1024 && "Request for magic string too long");
char* buf = (char*) alloca(1 + len);
int fd = ::open(path.c_str(),O_RDONLY);
if (fd < 0)
return false;
if (0 != ::read(fd, buf, len))
return false;
close(fd);
buf[len] = '\0';
f.close();
return Magic == buf;
}
bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
if (!isFile())
return false;
char buf[1 + len];
std::ifstream f(path.c_str());
f.read(buf,len);
assert(len < 1024 && "Request for magic string too long");
char* buf = (char*) alloca(1 + len);
int fd = ::open(path.c_str(),O_RDONLY);
if (fd < 0)
return false;
if (0 != ::read(fd, buf, len))
return false;
close(fd);
buf[len] = '\0';
Magic = buf;
return true;