fish-shell/path.cpp

512 lines
8.7 KiB
C++

#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <libgen.h>
#include "fallback.h"
#include "util.h"
#include "common.h"
#include "env.h"
#include "wutil.h"
#include "halloc.h"
#include "halloc_util.h"
#include "path.h"
#include "expand.h"
/**
Unexpected error in path_get_path()
*/
#define MISSING_COMMAND_ERR_MSG _( L"Error while searching for command '%ls'" )
bool path_get_path_string(const wcstring &cmd_str, wcstring &output, const env_vars &vars)
{
const wchar_t * const cmd = cmd_str.c_str();
int err = ENOENT;
debug( 3, L"path_get_path_string( '%ls' )", cmd );
if(wcschr( cmd, L'/' ) != 0 )
{
if( waccess( cmd, X_OK )==0 )
{
struct stat buff;
if(wstat( cmd, &buff ))
{
return false;
}
if (S_ISREG(buff.st_mode))
{
output = cmd_str;
return true;
}
else
{
errno = EACCES;
return false;
}
}
else
{
//struct stat buff;
//wstat( cmd, &buff );
return false;
}
}
else
{
const wchar_t *path = vars.get(L"PATH");
if( path == 0 )
{
if( contains( PREFIX L"/bin", L"/bin", L"/usr/bin" ) )
{
path = L"/bin" ARRAY_SEP_STR L"/usr/bin";
}
else
{
path = L"/bin" ARRAY_SEP_STR L"/usr/bin" ARRAY_SEP_STR PREFIX L"/bin";
}
}
wcstokenizer tokenizer(path, ARRAY_SEP_STR);
wcstring new_cmd;
while (tokenizer.next(new_cmd))
{
size_t path_len = new_cmd.size();
if (path_len == 0) continue;
append_path_component(new_cmd, cmd_str);
if( waccess( new_cmd.c_str(), X_OK )==0 )
{
struct stat buff;
if( wstat( new_cmd.c_str(), &buff )==-1 )
{
if( errno != EACCES )
{
wperror( L"stat" );
}
continue;
}
if( S_ISREG(buff.st_mode) )
{
output = new_cmd;
return true;
}
err = EACCES;
}
else
{
switch( errno )
{
case ENOENT:
case ENAMETOOLONG:
case EACCES:
case ENOTDIR:
break;
default:
{
debug( 1,
MISSING_COMMAND_ERR_MSG,
new_cmd.c_str() );
wperror( L"access" );
}
}
}
}
}
errno = err;
return false;
}
wchar_t *path_get_path( const wchar_t *cmd )
{
int err = ENOENT;
CHECK( cmd, 0 );
debug( 3, L"path_get_path( '%ls' )", cmd );
if(wcschr( cmd, L'/' ) != 0 )
{
if( waccess( cmd, X_OK )==0 )
{
struct stat buff;
if(wstat( cmd, &buff ))
{
return 0;
}
if( S_ISREG(buff.st_mode) )
return wcsdup( cmd );
else
{
errno = EACCES;
return 0;
}
}
else
{
struct stat buff;
wstat( cmd, &buff );
return 0;
}
}
else
{
env_var_t path = env_get_string(L"PATH");
if( path.missing() )
{
if( contains( PREFIX L"/bin", L"/bin", L"/usr/bin" ) )
{
path = L"/bin" ARRAY_SEP_STR L"/usr/bin";
}
else
{
path = L"/bin" ARRAY_SEP_STR L"/usr/bin" ARRAY_SEP_STR PREFIX L"/bin";
}
}
/*
Allocate string long enough to hold the whole command
*/
wchar_t *new_cmd = (wchar_t *)calloc(wcslen(cmd)+path.size()+2, sizeof(wchar_t) );
/*
We tokenize a copy of the path, since strtok modifies
its arguments
*/
wchar_t *path_cpy = wcsdup( path.c_str() );
const wchar_t *nxt_path = path.c_str();
wchar_t *state;
if( (new_cmd==0) || (path_cpy==0) )
{
DIE_MEM();
}
for( nxt_path = wcstok( path_cpy, ARRAY_SEP_STR, &state );
nxt_path != 0;
nxt_path = wcstok( 0, ARRAY_SEP_STR, &state) )
{
int path_len = wcslen( nxt_path );
wcscpy( new_cmd, nxt_path );
if( new_cmd[path_len-1] != L'/' )
{
new_cmd[path_len++]=L'/';
}
wcscpy( &new_cmd[path_len], cmd );
if( waccess( new_cmd, X_OK )==0 )
{
struct stat buff;
if( wstat( new_cmd, &buff )==-1 )
{
if( errno != EACCES )
{
wperror( L"stat" );
}
continue;
}
if( S_ISREG(buff.st_mode) )
{
free( path_cpy );
return new_cmd;
}
err = EACCES;
}
else
{
switch( errno )
{
case ENOENT:
case ENAMETOOLONG:
case EACCES:
case ENOTDIR:
break;
default:
{
debug( 1,
MISSING_COMMAND_ERR_MSG,
new_cmd );
wperror( L"access" );
}
}
}
}
free( path_cpy );
}
errno = err;
return 0;
}
bool path_get_cdpath_string(const wcstring &dir_str, wcstring &result, const env_vars &vars)
{
wchar_t *res = 0;
int err = ENOENT;
bool success = false;
const wchar_t *const dir = dir_str.c_str();
if( dir[0] == L'/'|| (wcsncmp( dir, L"./", 2 )==0) )
{
struct stat buf;
if( wstat( dir, &buf ) == 0 )
{
if( S_ISDIR(buf.st_mode) )
{
result = dir_str;
success = true;
}
else
{
err = ENOTDIR;
}
}
}
else
{
const wchar_t *path = vars.get(L"CDPATH");
if( !path || !wcslen(path) )
{
path = L".";
}
wcstokenizer tokenizer(path, ARRAY_SEP_STR);
wcstring next_path;
while (tokenizer.next(next_path))
{
expand_tilde(next_path);
if (next_path.size() == 0) continue;
wcstring whole_path = next_path;
append_path_component(whole_path, dir);
struct stat buf;
if( wstat( whole_path.c_str(), &buf ) == 0 )
{
if( S_ISDIR(buf.st_mode) )
{
result = whole_path;
success = true;
break;
}
else
{
err = ENOTDIR;
}
}
else
{
if( lwstat( whole_path.c_str(), &buf ) == 0 )
{
err = EROTTEN;
}
}
}
}
if( !success )
{
errno = err;
}
return res;
}
wchar_t *path_allocate_cdpath( const wchar_t *dir )
{
wchar_t *res = 0;
int err = ENOENT;
if( !dir )
return 0;
if( dir[0] == L'/'|| (wcsncmp( dir, L"./", 2 )==0) )
{
struct stat buf;
if( wstat( dir, &buf ) == 0 )
{
if( S_ISDIR(buf.st_mode) )
{
res = wcsdup(dir);
}
else
{
err = ENOTDIR;
}
}
}
else
{
wchar_t *path_cpy;
const wchar_t *nxt_path;
wchar_t *state;
wchar_t *whole_path;
env_var_t path = env_get_string(L"CDPATH");
if( path.missing_or_empty() )
path = L".";
nxt_path = path.c_str();
path_cpy = wcsdup( path.c_str() );
if( !path_cpy )
{
DIE_MEM();
}
for( nxt_path = wcstok( path_cpy, ARRAY_SEP_STR, &state );
nxt_path != 0;
nxt_path = wcstok( 0, ARRAY_SEP_STR, &state) )
{
wchar_t *expanded_path = expand_tilde_compat( wcsdup(nxt_path) );
// debug( 2, L"woot %ls\n", expanded_path );
int path_len = wcslen( expanded_path );
if( path_len == 0 )
{
free(expanded_path );
continue;
}
whole_path =
wcsdupcat( expanded_path,
( expanded_path[path_len-1] != L'/' )?L"/":L"",
dir );
free(expanded_path );
struct stat buf;
if( wstat( whole_path, &buf ) == 0 )
{
if( S_ISDIR(buf.st_mode) )
{
res = whole_path;
break;
}
else
{
err = ENOTDIR;
}
}
else
{
if( lwstat( whole_path, &buf ) == 0 )
{
err = EROTTEN;
}
}
free( whole_path );
}
free( path_cpy );
}
if( !res )
{
errno = err;
}
return res;
}
bool path_can_get_cdpath(const wcstring &in) {
wchar_t *tmp = path_allocate_cdpath(in.c_str());
bool result = (tmp != NULL);
free(tmp);
return result;
}
wchar_t *path_get_config( void *context)
{
int done = 0;
wcstring res;
const env_var_t xdg_dir = env_get_string( L"XDG_CONFIG_HOME" );
if( ! xdg_dir.missing() )
{
res = xdg_dir + L"/fish";
if( !create_directory( res.c_str() ) )
{
done = 1;
}
}
else
{
const env_var_t home = env_get_string( L"HOME" );
if( ! home.missing() )
{
res = home + L"/.config/fish";
if( !create_directory( res.c_str() ) )
{
done = 1;
}
}
}
if( done )
{
wchar_t *result = wcsdup(res.c_str());
halloc_register_function( context, &free, result );
return result;
}
else
{
debug( 0, _(L"Unable to create a configuration directory for fish. Your personal settings will not be saved. Please set the $XDG_CONFIG_HOME variable to a directory where the current user has write access." ));
return 0;
}
}
wchar_t *path_make_canonical( void *context, const wchar_t *path )
{
wchar_t *res = halloc_wcsdup( context, path );
wchar_t *in, *out;
in = out = res;
while( *in )
{
if( *in == L'/' )
{
while( *(in+1) == L'/' )
{
in++;
}
}
*out = *in;
out++;
in++;
}
while( 1 )
{
if( out == res )
break;
if( *(out-1) != L'/' )
break;
out--;
}
*out = 0;
return res;
}