mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-07-08 15:24:21 +00:00
Revise the design of the Path concept per peer review. Too many changes to
note individually but these essence of it is to not derive from std::string, clarify the interface, and provide better documentation. There is now also (untested) implementations for AIX, Darwin, and SunOS. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16078 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
@ -13,126 +13,321 @@
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on all UNIX variants.
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "Unix.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <Config/config.h>
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bool
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Path::is_file() const {
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if (!empty() && ((*this)[length()-1] != '/'))
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return true;
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return false;
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}
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namespace llvm {
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using namespace sys;
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bool
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Path::is_directory() const {
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if ((!empty()) && ((*this)[length()-1] == '/'))
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return true;
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return false;
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}
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void
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Path::create( bool create_parents) {
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if ( is_directory() ) {
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if ( create_parents )
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this->create_directories( );
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this->create_directory( );
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} else if ( is_file() ) {
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if ( create_parents )
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this->create_directories( );
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this->create_file( );
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}
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}
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void
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Path::remove() {
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if ( is_directory() ) {
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if ( exists() )
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this->remove_directory( );
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} else if ( is_file() )
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if ( exists() )
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this->remove_file( );
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}
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bool
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Path::exists() {
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char pathname[MAXPATHLEN];
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this->fill(pathname,MAXPATHLEN);
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int lastchar = this->length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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return 0 == access(pathname, F_OK );
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}
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void
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Path::create_directory( ) {
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char pathname[MAXPATHLEN];
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this->fill(pathname,MAXPATHLEN);
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int lastchar = this->length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
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ThrowErrno(pathname);
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}
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void
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Path::create_directories() {
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char pathname[MAXPATHLEN];
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this->fill(pathname,MAXPATHLEN);
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int lastchar = this->length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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char * next = index(pathname,'/');
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if ( pathname[0] == '/')
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next = index(&pathname[1],'/');
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while ( next != 0 )
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{
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*next = 0;
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if (0 != access(pathname, F_OK | R_OK))
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if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
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ThrowErrno(pathname);
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char* save = next;
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next = index(pathname,'/');
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*save = '/';
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}
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}
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void
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Path::remove_directory()
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Path::Path(std::string unverified_path)
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: path(unverified_path)
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{
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char pathname[MAXPATHLEN];
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this->fill(pathname,MAXPATHLEN);
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int lastchar = this->length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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if ( 0 != rmdir(pathname))
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ThrowErrno(pathname);
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if (unverified_path.empty())
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return;
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if (this->is_valid())
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return;
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// oops, not valid.
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path.clear();
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ThrowErrno(unverified_path + ": path is not valid");
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}
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void
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Path
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Path::GetRootDirectory() {
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Path result;
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result.set_directory("/");
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return result;
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}
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Path
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Path::GetTemporaryDirectory() {
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char pathname[MAXPATHLEN];
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strcpy(pathname,"/tmp/llvm_XXXXXX");
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if (0 == mkdtemp(pathname))
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ThrowErrno(std::string(pathname) + ": Can't create temporary directory");
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Path result;
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result.set_directory(pathname);
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assert(result.is_valid() && "mkdtemp didn't create a valid pathname!");
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return result;
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}
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Path
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Path::GetSystemLibraryPath1() {
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return Path("/lib/");
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}
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Path
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Path::GetSystemLibraryPath2() {
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return Path("/usr/lib/");
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}
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Path
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Path::GetLLVMDefaultConfigDir() {
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return Path("/etc/llvm/");
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}
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Path
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Path::GetLLVMConfigDir() {
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Path result;
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if (result.set_directory(LLVM_ETCDIR))
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return result;
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return GetLLVMDefaultConfigDir();
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}
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Path
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Path::GetUserHomeDirectory() {
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const char* home = getenv("HOME");
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if (home) {
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Path result;
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if (result.set_directory(home))
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return result;
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}
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return GetRootDirectory();
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}
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bool
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Path::exists() const {
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return 0 == access(path.c_str(), F_OK );
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}
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bool
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Path::readable() const {
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return 0 == access(path.c_str(), F_OK | R_OK );
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}
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bool
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Path::writable() const {
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return 0 == access(path.c_str(), F_OK | W_OK );
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}
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bool
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Path::executable() const {
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return 0 == access(path.c_str(), R_OK | X_OK );
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}
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std::string
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Path::getLast() const {
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// Find the last slash
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size_t pos = path.rfind('/');
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// Handle the corner cases
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if (pos == std::string::npos)
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return path;
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// If the last character is a slash
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if (pos == path.length()-1) {
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// Find the second to last slash
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size_t pos2 = path.rfind('/', pos-1);
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if (pos2 == std::string::npos)
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return path.substr(0,pos);
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else
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return path.substr(pos2+1,pos-pos2-1);
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}
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// Return everything after the last slash
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return path.substr(pos+1);
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}
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bool
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Path::set_directory(const std::string& a_path) {
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if (a_path.size() == 0)
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return false;
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Path save(*this);
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path = a_path;
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size_t last = a_path.size() -1;
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if (last != 0 && a_path[last] != '/')
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path += '/';
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if (!is_valid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::set_file(const std::string& a_path) {
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if (a_path.size() == 0)
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return false;
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Path save(*this);
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path = a_path;
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size_t last = a_path.size() - 1;
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while (last > 0 && a_path[last] == '/')
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last--;
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path.erase(last+1);
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if (!is_valid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::append_directory(const std::string& dir) {
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if (is_file())
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return false;
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Path save(*this);
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path += dir;
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path += "/";
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if (!is_valid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::elide_directory() {
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if (is_file())
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return false;
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size_t slashpos = path.rfind('/',path.size());
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if (slashpos == 0 || slashpos == std::string::npos)
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return false;
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if (slashpos == path.size() - 1)
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slashpos = path.rfind('/',slashpos-1);
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if (slashpos == std::string::npos)
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return false;
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path.erase(slashpos);
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return true;
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}
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bool
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Path::append_file(const std::string& file) {
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if (!is_directory())
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return false;
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Path save(*this);
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path += file;
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if (!is_valid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::elide_file() {
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if (is_directory())
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return false;
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size_t slashpos = path.rfind('/',path.size());
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if (slashpos == std::string::npos)
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return false;
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path.erase(slashpos+1);
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return true;
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}
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bool
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Path::append_suffix(const std::string& suffix) {
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if (is_directory())
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return false;
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Path save(*this);
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path.append(".");
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path.append(suffix);
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if (!is_valid()) {
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path = save.path;
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return false;
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}
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return true;
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}
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bool
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Path::elide_suffix() {
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if (is_directory()) return false;
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size_t dotpos = path.rfind('.',path.size());
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size_t slashpos = path.rfind('/',path.size());
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if (slashpos != std::string::npos && dotpos != std::string::npos &&
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dotpos > slashpos) {
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path.erase(dotpos, path.size()-dotpos);
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return true;
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}
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return false;
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}
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bool
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Path::create_directory( bool create_parents) {
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// Make sure we're dealing with a directory
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if (!is_directory()) return false;
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// Get a writeable copy of the path name
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char pathname[MAXPATHLEN];
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path.copy(pathname,MAXPATHLEN);
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// Null-terminate the last component
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int lastchar = path.length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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// If we're supposed to create intermediate directories
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if ( create_parents ) {
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// Find the end of the initial name component
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char * next = strchr(pathname,'/');
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if ( pathname[0] == '/')
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next = strchr(&pathname[1],'/');
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// Loop through the directory components until we're done
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while ( next != 0 ) {
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*next = 0;
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if (0 != access(pathname, F_OK | R_OK | W_OK))
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if (0 != mkdir(pathname, S_IRWXU | S_IRWXG))
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ThrowErrno(std::string(pathname) + ": Can't create directory");
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char* save = next;
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next = strchr(pathname,'/');
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*save = '/';
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}
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} else if (0 != mkdir(pathname, S_IRWXU | S_IRWXG)) {
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ThrowErrno(std::string(pathname) + ": Can't create directory");
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}
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return true;
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}
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bool
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Path::create_file() {
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char pathname[MAXPATHLEN];
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this->fill(pathname,MAXPATHLEN);
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int lastchar = this->length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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if (0 != creat(pathname, S_IRUSR | S_IWUSR))
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ThrowErrno(pathname);
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// Make sure we're dealing with a file
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if (!is_file()) return false;
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// Create the file
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if (0 != creat(path.c_str(), S_IRUSR | S_IWUSR))
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ThrowErrno(std::string(path.c_str()) + ": Can't create file");
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return true;
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}
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bool
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Path::destroy_directory(bool remove_contents) {
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// Make sure we're dealing with a directory
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if (!is_directory()) return false;
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// If it doesn't exist, we're done.
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if (!exists()) return true;
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if (remove_contents) {
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// Recursively descend the directory to remove its content
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std::string cmd("/bin/rm -rf ");
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cmd += path;
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system(cmd.c_str());
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} else {
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// Otherwise, try to just remove the one directory
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char pathname[MAXPATHLEN];
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path.copy(pathname,MAXPATHLEN);
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int lastchar = path.length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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if ( 0 != rmdir(pathname))
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ThrowErrno(std::string(pathname) + ": Can't destroy directory");
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}
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return true;
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}
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bool
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Path::destroy_file() {
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if (!is_file()) return false;
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if (0 != unlink(path.c_str()))
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ThrowErrno(std::string(path.c_str()) + ": Can't destroy file");
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return true;
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}
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void
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Path::remove_file() {
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char pathname[MAXPATHLEN];
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this->fill(pathname,MAXPATHLEN);
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int lastchar = this->length() - 1 ;
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if (pathname[lastchar] == '/')
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pathname[lastchar] = 0;
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if (0 != unlink(pathname))
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ThrowErrno(pathname);
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}
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// vim: sw=2
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