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expand.c
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expand.c
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/**\file expand.c
String expansion functions. These functions perform several kinds of
parameter expansion.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <string.h>
#include <wctype.h>
#include <errno.h>
#include <pwd.h>
#include <unistd.h>
#include <sys/types.h>
#include <termios.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include <assert.h>
#ifdef SunOS
#include <procfs.h>
#endif
#include "fallback.h"
#include "util.h"
#include "common.h"
#include "wutil.h"
#include "env.h"
#include "proc.h"
#include "parser.h"
#include "expand.h"
#include "wildcard.h"
#include "exec.h"
#include "signal.h"
#include "tokenizer.h"
#include "complete.h"
#include "parse_util.h"
#include "halloc.h"
#include "halloc_util.h"
/**
Error issued on invalid variable name
*/
#define COMPLETE_VAR_DESC _( L"The '$' character begins a variable name. The character '%lc', which directly followed a '$', is not allowed as a part of a variable name, and variable names may not be zero characters long. To learn more about variable expansion in fish, type 'help expand-variable'.")
/**
Error issued on invalid variable name
*/
#define COMPLETE_VAR_NULL_DESC _( L"The '$' begins a variable name. It was given at the end of an argument. Variable names may not be zero characters long. To learn more about variable expansion in fish, type 'help expand-variable'.")
/**
Error issued on invalid variable name
*/
#define COMPLETE_VAR_BRACKET_DESC _( L"Did you mean %ls{$%ls}%ls? The '$' character begins a variable name. A bracket, which directly followed a '$', is not allowed as a part of a variable name, and variable names may not be zero characters long. To learn more about variable expansion in fish, type 'help expand-variable'." )
/**
Error issued on invalid variable name
*/
#define COMPLETE_VAR_PARAN_DESC _( L"Did you mean (COMMAND)? In fish, the '$' character is only used for accessing variables. To learn more about command substitution in fish, type 'help expand-command-substitution'.")
/**
Description for child process
*/
#define COMPLETE_CHILD_PROCESS_DESC _( L"Child process")
/**
Description for non-child process
*/
#define COMPLETE_PROCESS_DESC _( L"Process")
/**
Description for long job
*/
#define COMPLETE_JOB_DESC _( L"Job")
/**
Description for short job. The job command is concatenated
*/
#define COMPLETE_JOB_DESC_VAL _( L"Job: %ls")
/**
Description for the shells own pid
*/
#define COMPLETE_SELF_DESC _( L"Shell process")
/**
Description for the shells own pid
*/
#define COMPLETE_LAST_DESC _( L"Last background job")
/**
String in process expansion denoting ourself
*/
#define SELF_STR L"self"
/**
String in process expansion denoting last background job
*/
#define LAST_STR L"last"
/**
Characters which make a string unclean if they are the first
character of the string. See \c expand_is_clean().
*/
#define UNCLEAN_FIRST L"~%"
/**
Unclean characters. See \c expand_is_clean().
*/
#define UNCLEAN L"$*?\\\"'({})"
int expand_is_clean( const wchar_t *in )
{
const wchar_t * str = in;
CHECK( in, 1 );
/*
Test characters that have a special meaning in the first character position
*/
if( wcschr( UNCLEAN_FIRST, *str ) )
return 0;
/*
Test characters that have a special meaning in any character position
*/
while( *str )
{
if( wcschr( UNCLEAN, *str ) )
return 0;
str++;
}
return 1;
}
/**
Return the environment variable value for the string starting at \c in.
*/
static wchar_t *expand_var( wchar_t *in )
{
if( !in )
return 0;
return env_get( in );
}
/**
Test if the specified string does not contain character which can
not be used inside a quoted string.
*/
static int is_quotable( wchar_t *str )
{
switch( *str )
{
case 0:
return 1;
case L'\n':
case L'\t':
case L'\r':
case L'\b':
case L'\x1b':
return 0;
default:
return is_quotable(str+1);
}
return 0;
}
wchar_t *expand_escape_variable( const wchar_t *in )
{
array_list_t l;
string_buffer_t buff;
CHECK( in, 0 );
al_init( &l );
tokenize_variable_array( in, &l );
sb_init( &buff );
switch( al_get_count( &l) )
{
case 0:
sb_append( &buff, L"''");
break;
case 1:
{
wchar_t *el = (wchar_t *)al_get( &l, 0 );
if( wcschr( el, L' ' ) && is_quotable( el ) )
{
sb_append( &buff,
L"'",
el,
L"'",
(void *)0 );
}
else
{
wchar_t *val = escape( el, 1 );
sb_append( &buff, val );
free( val );
}
free( el );
break;
}
default:
{
int j;
for( j=0; j<al_get_count( &l ); j++ )
{
wchar_t *el = (wchar_t *)al_get( &l, j );
if( j )
sb_append( &buff, L" " );
if( is_quotable( el ) )
{
sb_append( &buff,
L"'",
el,
L"'",
(void *)0 );
}
else
{
wchar_t *val = escape( el, 1 );
sb_append( &buff, val );
free( val );
}
free( el );
}
}
}
al_destroy( &l );
return (wchar_t *)buff.buff;
}
/**
Tests if all characters in the wide string are numeric
*/
static int iswnumeric( const wchar_t *n )
{
for( ; *n; n++ )
{
if( *n < L'0' || *n > L'9' )
{
return 0;
}
}
return 1;
}
/**
See if the process described by \c proc matches the commandline \c
cmd
*/
static int match_pid( const wchar_t *cmd,
const wchar_t *proc,
int flags,
int *offset)
{
/* Test for direct match */
if( wcsncmp( cmd, proc, wcslen( proc ) ) == 0 )
{
if( offset )
*offset = 0;
return 1;
}
/*
Test if the commandline is a path to the command, if so we try
to match against only the command part
*/
wchar_t *first_token = tok_first( cmd );
if( first_token == 0 )
return 0;
wchar_t *start=0;
wchar_t prev=0;
wchar_t *p;
/*
This should be done by basename(), if it wasn't for the fact
that is does not accept wide strings
*/
for( p=first_token; *p; p++ )
{
if( *p == L'/' && prev != L'\\' )
start = p;
prev = *p;
}
if( start )
{
if( wcsncmp( start+1, proc, wcslen( proc ) ) == 0 )
{
if( offset )
*offset = start+1-first_token;
free( first_token );
return 1;
}
}
free( first_token );
return 0;
}
/**
Searches for a job with the specified job id, or a job or process
which has the string \c proc as a prefix of its commandline.
If the ACCEPT_INCOMPLETE flag is set, the remaining string for any matches
are inserted.
Otherwise, any job matching the specified string is matched, and
the job pgid is returned. If no job matches, all child processes
are searched. If no child processes match, and <tt>fish</tt> can
understand the contents of the /proc filesystem, all the users
processes are searched for matches.
*/
static int find_process( const wchar_t *proc,
int flags,
array_list_t *out )
{
DIR *dir;
struct wdirent *next;
wchar_t *pdir_name;
wchar_t *pfile_name;
wchar_t *cmd=0;
int sz=0;
int found = 0;
wchar_t *result;
job_t *j;
if( iswnumeric(proc) || (wcslen(proc)==0) )
{
/*
This is a numeric job string, like '%2'
*/
if( flags & ACCEPT_INCOMPLETE )
{
for( j=first_job; j != 0; j=j->next )
{
wchar_t jid[16];
if( j->command == 0 )
continue;
swprintf( jid, 16, L"%d", j->job_id );
if( wcsncmp( proc, jid, wcslen(proc ) )==0 )
{
string_buffer_t desc_buff;
sb_init( &desc_buff );
sb_printf( &desc_buff,
COMPLETE_JOB_DESC_VAL,
j->command );
completion_allocate( out,
jid+wcslen(proc),
(wchar_t *)desc_buff.buff,
0 );
sb_destroy( &desc_buff );
}
}
}
else
{
int jid;
wchar_t *end;
errno = 0;
jid = wcstol( proc, &end, 10 );
if( jid > 0 && !errno && !*end )
{
j = job_get( jid );
if( (j != 0) && (j->command != 0 ) )
{
{
result = malloc(sizeof(wchar_t)*16 );
swprintf( result, 16, L"%d", j->pgid );
al_push( out, result );
found = 1;
}
}
}
}
}
if( found )
return 1;
for( j=first_job; j != 0; j=j->next )
{
int offset;
if( j->command == 0 )
continue;
if( match_pid( j->command, proc, flags, &offset ) )
{
if( flags & ACCEPT_INCOMPLETE )
{
completion_allocate( out,
j->command + offset + wcslen(proc),
COMPLETE_JOB_DESC,
0 );
}
else
{
result = malloc(sizeof(wchar_t)*16 );
swprintf( result, 16, L"%d", j->pgid );
al_push( out, result );
found = 1;
}
}
}
if( found )
{
return 1;
}
for( j=first_job; j; j=j->next )
{
process_t *p;
if( j->command == 0 )
continue;
for( p=j->first_process; p; p=p->next )
{
int offset;
if( p->actual_cmd == 0 )
continue;
if( match_pid( p->actual_cmd, proc, flags, &offset ) )
{
if( flags & ACCEPT_INCOMPLETE )
{
completion_allocate( out,
p->actual_cmd + offset + wcslen(proc),
COMPLETE_CHILD_PROCESS_DESC,
0 );
}
else
{
result = malloc(sizeof(wchar_t)*16 );
swprintf( result, 16, L"%d", p->pid );
al_push( out, result );
found = 1;
}
}
}
}
if( found )
{
return 1;
}
if( !(dir = opendir( "/proc" )))
{
/*
This system does not have a /proc filesystem.
*/
return 1;
}
pdir_name = malloc( sizeof(wchar_t)*256 );
pfile_name = malloc( sizeof(wchar_t)*64 );
wcscpy( pdir_name, L"/proc/" );
while( (next=wreaddir(dir))!=0 )
{
wchar_t *name = next->d_name;
struct stat buf;
if( !iswnumeric( name ) )
continue;
wcscpy( pdir_name + 6, name );
if( wstat( pdir_name, &buf ) )
{
continue;
}
if( buf.st_uid != getuid() )
{
continue;
}
wcscpy( pfile_name, pdir_name );
wcscat( pfile_name, L"/cmdline" );
if( !wstat( pfile_name, &buf ) )
{
/*
the 'cmdline' file exists, it should contain the commandline
*/
FILE *cmdfile;
if((cmdfile=wfopen( pfile_name, "r" ))==0)
{
wperror( L"fopen" );
continue;
}
signal_block();
fgetws2( &cmd, &sz, cmdfile );
signal_unblock();
fclose( cmdfile );
}
else
{
#ifdef SunOS
wcscpy( pfile_name, pdir_name );
wcscat( pfile_name, L"/psinfo" );
if( !wstat( pfile_name, &buf ) )
{
psinfo_t info;
FILE *psfile;
if((psfile=wfopen( pfile_name, "r" ))==0)
{
wperror( L"fopen" );
continue;
}
if( fread( &info, sizeof(info), 1, psfile ) )
{
if( cmd != 0 )
free( cmd );
cmd = str2wcs( info.pr_fname );
}
fclose( psfile );
}
else
#endif
{
if( cmd != 0 )
{
*cmd = 0;
}
}
}
if( cmd != 0 )
{
int offset;
if( match_pid( cmd, proc, flags, &offset ) )
{
if( flags & ACCEPT_INCOMPLETE )
{
completion_allocate( out,
cmd + offset + wcslen(proc),
COMPLETE_PROCESS_DESC,
0 );
}
else
{
wchar_t *res = wcsdup(name);
if( res )
al_push( out, res );
}
}
}
}
if( cmd != 0 )
free( cmd );
free( pdir_name );
free( pfile_name );
closedir( dir );
return 1;
}
/**
Process id expansion
*/
static int expand_pid( wchar_t *in,
int flags,
array_list_t *out )
{
CHECK( in, 0 );
CHECK( out, 0 );
if( *in != PROCESS_EXPAND )
{
al_push( out, in );
return 1;
}
if( flags & ACCEPT_INCOMPLETE )
{
if( wcsncmp( in+1, SELF_STR, wcslen(in+1) )==0 )
{
completion_allocate( out,
SELF_STR+wcslen(in+1),
COMPLETE_SELF_DESC,
0 );
}
else if( wcsncmp( in+1, LAST_STR, wcslen(in+1) )==0 )
{
completion_allocate( out,
LAST_STR+wcslen(in+1),
COMPLETE_LAST_DESC,
0 );
}
}
else
{
if( wcscmp( (in+1), SELF_STR )==0 )
{
wchar_t *str= malloc( sizeof(wchar_t)*32);
free(in);
swprintf( str, 32, L"%d", getpid() );
al_push( out, str );
return 1;
}
if( wcscmp( (in+1), LAST_STR )==0 )
{
wchar_t *str;
if( proc_last_bg_pid > 0 )
{
str = malloc( sizeof(wchar_t)*32);
free(in);
swprintf( str, 32, L"%d", proc_last_bg_pid );
al_push( out, str );
}
return 1;
}
}
int prev = al_get_count( out );
if( !find_process( in+1, flags, out ) )
return 0;
if( prev == al_get_count( out ) )
{
if( flags & ACCEPT_INCOMPLETE )
free( in );
else
{
free(in);
return 0;
}
}
else
{
free( in );
}
return 1;
}
void expand_variable_error( const wchar_t *token, int token_pos, int error_pos )
{
int stop_pos = token_pos+1;
switch( token[stop_pos] )
{
case BRACKET_BEGIN:
{
wchar_t *cpy = wcsdup( token );
*(cpy+token_pos)=0;
wchar_t *name = &cpy[stop_pos+1];
wchar_t *end = wcschr( name, BRACKET_END );
wchar_t *post;
int is_var=0;
if( end )
{
post = end+1;
*end = 0;
if( !wcsvarname( name ) )
{
is_var = 1;
}
}
if( is_var )
{
error( SYNTAX_ERROR,
error_pos,
COMPLETE_VAR_BRACKET_DESC,
cpy,
name,
post );
}
else
{
error( SYNTAX_ERROR,
error_pos,
COMPLETE_VAR_BRACKET_DESC,
L"",
L"VARIABLE",
L"" );
}
free( cpy );
break;
}
case INTERNAL_SEPARATOR:
{
error( SYNTAX_ERROR,
error_pos,
COMPLETE_VAR_PARAN_DESC );
break;
}
case 0:
{
error( SYNTAX_ERROR,
error_pos,
COMPLETE_VAR_NULL_DESC );
break;
}
default:
{
error( SYNTAX_ERROR,
error_pos,
COMPLETE_VAR_DESC,
token[stop_pos] );
break;
}
}
}
/**
Parse an array slicing specification
*/
static int parse_slice( wchar_t *in, wchar_t **end_ptr, array_list_t *idx )
{
wchar_t *end;
int pos = 1;
// debug( 0, L"parse_slice on '%ls'", in );
while( 1 )
{
long tmp;
while( iswspace(in[pos]) || (in[pos]==INTERNAL_SEPARATOR))
pos++;
if( in[pos] == L']' )
{
pos++;
break;
}
errno=0;
tmp = wcstol( &in[pos], &end, 10 );
if( ( errno ) || ( end == &in[pos] ) )
{
return 1;
}
// debug( 0, L"Push idx %d", tmp );
al_push_long( idx, tmp );
pos = end-in;
}
if( end_ptr )
{
// debug( 0, L"Remainder is '%ls', slice def was %d characters long", in+pos, pos );
*end_ptr = in+pos;
}
// debug( 0, L"ok, done" );
return 0;
}
/**
Expand all environment variables in the string *ptr.
This function is slow, fragile and complicated. There are lots of
little corner cases, like $$foo should do a double expansion,
$foo$bar should not double expand bar, etc. Also, it's easy to
accidentally leak memory on array out of bounds errors an various
other situations. All in all, this function should be rewritten,
split out into multiple logical units and carefully tested. After
that, it can probably be optimized to do fewer memory allocations,
fewer string scans and overall just less work. But until that
happens, don't edit it unless you know exactly what you are doing,
and do proper testing afterwards.
*/
static int expand_variables( wchar_t *in, array_list_t *out, int last_idx )
{
wchar_t c;
wchar_t prev_char=0;
int i, j;
int is_ok= 1;
int empty=0;
static string_buffer_t *var_tmp = 0;
static array_list_t *var_idx_list = 0;
CHECK( in, 0 );
CHECK( out, 0 );
if( !var_tmp )
{
var_tmp = sb_halloc( global_context );
if( !var_tmp )
DIE_MEM();
}
else
{
sb_clear(var_tmp );
}
if( !var_idx_list )
{
var_idx_list = al_halloc( global_context );
if( !var_idx_list )
DIE_MEM();
}
else
{
al_truncate( var_idx_list, 0 );
}
for( i=last_idx; (i>=0) && is_ok && !empty; i-- )
{
c = in[i];
if( ( c == VARIABLE_EXPAND ) || (c == VARIABLE_EXPAND_SINGLE ) )
{
int start_pos = i+1;
int stop_pos;
int var_len, new_len;
wchar_t * var_val;
wchar_t * new_in;
int is_single = (c==VARIABLE_EXPAND_SINGLE);
int var_name_stop_pos;
stop_pos = start_pos;
while( 1 )
{
if( !(in[stop_pos ]) )
break;
if( !( iswalnum( in[stop_pos] ) ||
(wcschr(L"_", in[stop_pos])!= 0) ) )
break;
stop_pos++;
}
var_name_stop_pos = stop_pos;
/* printf( "Stop for '%c'\n", in[stop_pos]);*/
var_len = stop_pos - start_pos;
if( var_len == 0 )
{
expand_variable_error( in, stop_pos-1, -1 );
is_ok = 0;
break;
}
sb_append_substring( var_tmp, &in[start_pos], var_len );
var_val = expand_var( (wchar_t *)var_tmp->buff );
if( var_val )
{
int all_vars=1;
array_list_t var_item_list;
al_init( &var_item_list );
if( in[stop_pos] == L'[' )
{
wchar_t *slice_end;
all_vars=0;
if( parse_slice( &in[stop_pos], &slice_end, var_idx_list ) )
{
error( SYNTAX_ERROR,
-1,
L"Invalid index value" );
is_ok = 0;
}
stop_pos = (slice_end-in);
}
if( is_ok )
{
tokenize_variable_array( var_val, &var_item_list );
if( !all_vars )
{
int j;
for( j=0; j<al_get_count( var_idx_list ); j++)
{
long tmp = al_get_long( var_idx_list, j );
if( tmp < 0 )
{
tmp = al_get_count( &var_item_list)+tmp+1;
}
/*
Check that we are within array
bounds. If not, truncate the list to
exit.
*/
if( tmp < 1 || tmp > al_get_count( &var_item_list ) )
{
error( SYNTAX_ERROR,
-1,
ARRAY_BOUNDS_ERR );
is_ok=0;
al_truncate( var_idx_list, j );
break;
}
else
{
/* Replace each index in var_idx_list inplace with the string value at the specified index */
al_set( var_idx_list, j, wcsdup(al_get( &var_item_list, tmp-1 ) ) );
}
}
/* Free strings in list var_item_list and truncate it */
al_foreach( &var_item_list, &free );
al_truncate( &var_item_list, 0 );
/* Add items from list idx back to list l */
al_push_all( &var_item_list, var_idx_list );
}
}
if( is_ok )
{
if( is_single )
{
string_buffer_t res;
in[i]=0;
sb_init( &res );
sb_append( &res, in );
sb_append_char( &res, INTERNAL_SEPARATOR );
for( j=0; j<al_get_count( &var_item_list); j++ )
{
wchar_t *next = (wchar_t *)al_get( &var_item_list, j );
if( is_ok )
{
if( j != 0 )
sb_append( &res, L" " );
sb_append( &res, next );
}
free( next );
}
sb_append( &res, &in[stop_pos] );
is_ok &= expand_variables( (wchar_t *)res.buff, out, i );