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

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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17901 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2004-11-16 17:14:08 +00:00
parent 0033baf94e
commit be31d2ad78
2 changed files with 34 additions and 14 deletions
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24
lib/System/Unix/Path.cpp
View File

@ -17,6 +17,7 @@
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#include <llvm/Config/config.h> #include <llvm/Config/config.h>
#include <llvm/Config/alloca.h>
#include "Unix.h" #include "Unix.h"
#include <sys/stat.h> #include <sys/stat.h>
#include <fcntl.h> #include <fcntl.h>
@ -157,20 +158,29 @@ Path::getBasename() const {
bool Path::hasMagicNumber(const std::string &Magic) const { bool Path::hasMagicNumber(const std::string &Magic) const {
size_t len = Magic.size(); size_t len = Magic.size();
char buf[ 1 + len]; assert(len < 1024 && "Request for magic string too long");
std::ifstream f(path.c_str()); char* buf = (char*) alloca(1 + len);
f.read(buf, 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'; buf[len] = '\0';
f.close();
return Magic == buf; return Magic == buf;
} }
bool Path::getMagicNumber(std::string& Magic, unsigned len) const { bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
if (!isFile()) if (!isFile())
return false; return false;
char buf[1 + len]; assert(len < 1024 && "Request for magic string too long");
std::ifstream f(path.c_str()); char* buf = (char*) alloca(1 + len);
f.read(buf,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'; buf[len] = '\0';
Magic = buf; Magic = buf;
return true; return true;

24
lib/System/Unix/Path.inc
View File

@ -17,6 +17,7 @@
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#include <llvm/Config/config.h> #include <llvm/Config/config.h>
#include <llvm/Config/alloca.h>
#include "Unix.h" #include "Unix.h"
#include <sys/stat.h> #include <sys/stat.h>
#include <fcntl.h> #include <fcntl.h>
@ -157,20 +158,29 @@ Path::getBasename() const {
bool Path::hasMagicNumber(const std::string &Magic) const { bool Path::hasMagicNumber(const std::string &Magic) const {
size_t len = Magic.size(); size_t len = Magic.size();
char buf[ 1 + len]; assert(len < 1024 && "Request for magic string too long");
std::ifstream f(path.c_str()); char* buf = (char*) alloca(1 + len);
f.read(buf, 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'; buf[len] = '\0';
f.close();
return Magic == buf; return Magic == buf;
} }
bool Path::getMagicNumber(std::string& Magic, unsigned len) const { bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
if (!isFile()) if (!isFile())
return false; return false;
char buf[1 + len]; assert(len < 1024 && "Request for magic string too long");
std::ifstream f(path.c_str()); char* buf = (char*) alloca(1 + len);
f.read(buf,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'; buf[len] = '\0';
Magic = buf; Magic = buf;
return true; return true;