fish-shell/wutil.cpp
ridiculousfish 0c79bb6e7c Factor is_potential_path to properly handle CDPATH
This will let us color cd commands better
2012-05-07 17:31:24 -07:00

425 lines
9 KiB
C++

/** \file wutil.c
Wide character equivalents of various standard unix
functions.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <wchar.h>
#include <wctype.h>
#include <string.h>
#include <dirent.h>
#include <stdarg.h>
#include <limits.h>
#include <libgen.h>
#include <pthread.h>
#include <string>
#include <map>
#if HAVE_LIBINTL_H
#include <libintl.h>
#endif
#include "fallback.h"
#include "util.h"
#include "common.h"
#include "wutil.h"
typedef std::string cstring;
/**
Minimum length of the internal covnersion buffers
*/
#define TMP_LEN_MIN 256
#ifndef PATH_MAX
#ifdef MAXPATHLEN
#define PATH_MAX MAXPATHLEN
#else
/**
Fallback length of MAXPATHLEN. Just a hopefully sane value...
*/
#define PATH_MAX 4096
#endif
#endif
/* Lock to protect wgettext */
static pthread_mutex_t wgettext_lock;
/* Maps string keys to (immortal) pointers to string values */
typedef std::map<wcstring, wcstring *> wgettext_map_t;
static std::map<wcstring, wcstring *> wgettext_map;
void wutil_init()
{
}
void wutil_destroy()
{
}
bool wreaddir_resolving(DIR *dir, const std::wstring &dir_path, std::wstring &out_name, bool *out_is_dir)
{
struct dirent *d = readdir( dir );
if ( !d ) return false;
out_name = str2wcstring(d->d_name);
if (out_is_dir) {
/* The caller cares if this is a directory, so check */
bool is_dir;
if (d->d_type == DT_DIR) {
is_dir = true;
} else if (d->d_type == DT_LNK || d->d_type == DT_UNKNOWN) {
/* We want to treat symlinks to directories as directories. Use stat to resolve it. */
cstring fullpath = wcs2string(dir_path);
fullpath.push_back('/');
fullpath.append(d->d_name);
struct stat buf;
if (stat(fullpath.c_str(), &buf) != 0) {
is_dir = false;
} else {
is_dir = !! (S_ISDIR(buf.st_mode));
}
} else {
is_dir = false;
}
*out_is_dir = is_dir;
}
return true;
}
bool wreaddir(DIR *dir, std::wstring &out_name)
{
struct dirent *d = readdir( dir );
if ( !d ) return false;
out_name = str2wcstring(d->d_name);
return true;
}
wchar_t *wgetcwd( wchar_t *buff, size_t sz )
{
char *buffc = (char *)malloc( sz*MAX_UTF8_BYTES);
char *res;
wchar_t *ret = 0;
if( !buffc )
{
errno = ENOMEM;
return 0;
}
res = getcwd( buffc, sz*MAX_UTF8_BYTES );
if( res )
{
if( (size_t)-1 != mbstowcs( buff, buffc, sizeof( wchar_t ) * sz ) )
{
ret = buff;
}
}
free( buffc );
return ret;
}
int wchdir( const wcstring &dir )
{
cstring tmp = wcs2string(dir);
return chdir( tmp.c_str() );
}
FILE *wfopen(const wcstring &path, const char *mode)
{
int permissions = 0, options = 0;
size_t idx = 0;
switch (mode[idx++]) {
case 'r':
permissions = O_RDONLY;
break;
case 'w':
permissions = O_WRONLY;
options = O_CREAT | O_TRUNC;
break;
case 'a':
permissions = O_WRONLY;
options = O_CREAT | O_APPEND;
break;
default:
errno = EINVAL;
return NULL;
break;
}
/* Skip binary */
if (mode[idx] == 'b')
idx++;
/* Consider append option */
if (mode[idx] == '+')
permissions = O_RDWR;
int fd = wopen_cloexec(path, permissions | options, 0666);
if (fd < 0)
return NULL;
FILE *result = fdopen(fd, mode);
if (result == NULL)
close(fd);
return result;
}
FILE *wfreopen(const wcstring &path, const char *mode, FILE *stream)
{
cstring tmp = wcs2string(path);
return freopen(tmp.c_str(), mode, stream);
}
bool set_cloexec(int fd) {
int flags = fcntl(fd, F_GETFD, 0);
if (flags < 0) {
return false;
} else if (flags & FD_CLOEXEC) {
return true;
} else {
return fcntl(fd, F_SETFD, flags | FD_CLOEXEC) >= 0;
}
}
static int wopen_internal(const wcstring &pathname, int flags, mode_t mode, bool cloexec)
{
ASSERT_IS_NOT_FORKED_CHILD();
cstring tmp = wcs2string(pathname);
/* Prefer to use O_CLOEXEC. It has to both be defined and nonzero */
#ifdef O_CLOEXEC
if (cloexec && O_CLOEXEC) {
flags |= O_CLOEXEC;
cloexec = false;
}
#endif
int fd = ::open(tmp.c_str(), flags, mode);
if (cloexec && fd >= 0 && ! set_cloexec(fd)) {
close(fd);
fd = -1;
}
return fd;
}
int wopen(const wcstring &pathname, int flags, mode_t mode)
{
// off the main thread, always use wopen_cloexec
ASSERT_IS_MAIN_THREAD();
ASSERT_IS_NOT_FORKED_CHILD();
return wopen_internal(pathname, flags, mode, false);
}
int wopen_cloexec(const wcstring &pathname, int flags, mode_t mode)
{
return wopen_internal(pathname, flags, mode, true);
}
int wcreat(const wcstring &pathname, mode_t mode)
{
cstring tmp = wcs2string(pathname);
return creat(tmp.c_str(), mode);
}
DIR *wopendir(const wcstring &name)
{
cstring tmp = wcs2string(name);
return opendir(tmp.c_str());
}
int wstat(const wcstring &file_name, struct stat *buf)
{
cstring tmp = wcs2string(file_name);
return stat(tmp.c_str(), buf);
}
int lwstat(const wcstring &file_name, struct stat *buf)
{
// fprintf(stderr, "%s\n", __PRETTY_FUNCTION__);
cstring tmp = wcs2string(file_name);
return lstat(tmp.c_str(), buf);
}
int waccess(const wcstring &file_name, int mode)
{
cstring tmp = wcs2string(file_name);
return access(tmp.c_str(), mode);
}
int wunlink(const wcstring &file_name)
{
cstring tmp = wcs2string(file_name);
return unlink(tmp.c_str());
}
void wperror(const wcstring &s)
{
int e = errno;
if( !s.empty() )
{
fwprintf( stderr, L"%ls: ", s.c_str() );
}
fwprintf( stderr, L"%s\n", strerror( e ) );
}
#ifdef HAVE_REALPATH_NULL
wchar_t *wrealpath(const wcstring &pathname, wchar_t *resolved_path)
{
cstring tmp = wcs2string(pathname);
char *narrow_res = realpath( tmp.c_str(), 0 );
wchar_t *res;
if( !narrow_res )
return 0;
if( resolved_path )
{
wchar_t *tmp2 = str2wcs( narrow_res );
wcslcpy( resolved_path, tmp2, PATH_MAX );
free( tmp2 );
res = resolved_path;
}
else
{
res = str2wcs( narrow_res );
}
free( narrow_res );
return res;
}
#else
wchar_t *wrealpath(const wchar_t *pathname, wchar_t *resolved_path)
{
cstring tmp = wcs2string(pathname);
char narrow_buff[PATH_MAX];
char *narrow_res = realpath( tmp.c_str(), narrow_buff );
wchar_t *res;
if( !narrow_res )
return 0;
if( resolved_path )
{
wchar_t *tmp2 = str2wcs( narrow_res );
wcslcpy( resolved_path, tmp2, PATH_MAX );
free( tmp2 );
res = resolved_path;
}
else
{
res = str2wcs( narrow_res );
}
return res;
}
#endif
wcstring wdirname( const wcstring &path )
{
char *tmp = wcs2str(path.c_str());
char *narrow_res = dirname( tmp );
wcstring result = format_string(L"%s", narrow_res);
free(tmp);
return result;
}
wcstring wbasename( const wcstring &path )
{
char *tmp = wcs2str(path.c_str());
char *narrow_res = basename( tmp );
wcstring result = format_string(L"%s", narrow_res);
free(tmp);
return result;
}
/* Really init wgettext */
static void wgettext_really_init() {
pthread_mutex_init(&wgettext_lock, NULL);
bindtextdomain( PACKAGE_NAME, LOCALEDIR );
textdomain( PACKAGE_NAME );
}
/**
For wgettext: Internal init function. Automatically called when a translation is first requested.
*/
static void wgettext_init_if_necessary()
{
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_once(&once, wgettext_really_init);
}
const wchar_t *wgettext( const wchar_t *in )
{
if( !in )
return in;
// preserve errno across this since this is often used in printing error messages
int err = errno;
wgettext_init_if_necessary();
wcstring key = in;
scoped_lock lock(wgettext_lock);
wcstring *& val = wgettext_map[key];
if (val == NULL) {
cstring mbs_in = wcs2string(key);
char *out = gettext(mbs_in.c_str());
val = new wcstring(format_string(L"%s", out));
}
errno = err;
return val->c_str();
}
wcstring wgettext2(const wcstring &in) {
wgettext_init_if_necessary();
std::string mbs_in = wcs2string(in);
char *out = gettext( mbs_in.c_str() );
wcstring result = format_string(L"%s", out);
return result;
}
const wchar_t *wgetenv( const wcstring &name )
{
ASSERT_IS_MAIN_THREAD();
cstring name_narrow = wcs2string(name);
char *res_narrow = getenv( name_narrow.c_str() );
static wcstring out;
if( !res_narrow )
return 0;
out = format_string(L"%s", res_narrow);
return out.c_str();
}
int wmkdir( const wcstring &name, int mode )
{
cstring name_narrow = wcs2string(name);
return mkdir( name_narrow.c_str(), mode );
}
int wrename( const wcstring &old, const wcstring &newv )
{
cstring old_narrow = wcs2string(old);
cstring new_narrow =wcs2string(newv);
return rename( old_narrow.c_str(), new_narrow.c_str() );
}