mirror of
https://github.com/fish-shell/fish-shell.git
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803 lines
14 KiB
C
803 lines
14 KiB
C
/** \file builtin_set.c Functions defining the set builtin
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Functions used for implementing the set builtin.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <wchar.h>
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#include <wctype.h>
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#include <sys/types.h>
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#include <termios.h>
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#include <signal.h>
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#include "config.h"
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#include "fallback.h"
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#include "util.h"
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#include "wutil.h"
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#include "builtin.h"
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#include "env.h"
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#include "expand.h"
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#include "common.h"
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#include "wgetopt.h"
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#include "proc.h"
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#include "parser.h"
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/**
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Error message for invalid path operations
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*/
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#define BUILTIN_SET_PATH_ERROR L"%ls: Could not add component %ls to %ls.\n"
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/**
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Hint for invalid path operation with a colon
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*/
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#define BUILTIN_SET_PATH_HINT L"%ls: Did you mean 'set %ls $%ls %ls'?\n"
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/**
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Error for mismatch between index count and elements
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*/
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#define BUILTIN_SET_ARG_COUNT L"%ls: The number of variable indexes does not match the number of values\n"
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/**
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Test if the specified variable should be subject to path validation
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*/
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static int is_path_variable( const wchar_t *env )
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{
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return contains_str( env,
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L"PATH",
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L"CDPATH",
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(void *)0 );
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}
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/**
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Call env_set. If this is a path variable, e.g. PATH, validate the
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elements. On error, print a description of the problem to stderr.
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*/
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static int my_env_set( const wchar_t *key, array_list_t *val, int scope )
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{
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string_buffer_t sb;
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int i;
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int retcode = 0;
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wchar_t *val_str=0;
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if( is_path_variable( key ) )
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{
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int error = 0;
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for( i=0; i<al_get_count( val ); i++ )
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{
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int show_perror = 0;
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int show_hint = 0;
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struct stat buff;
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wchar_t *dir = (wchar_t *)al_get( val, i );
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if( wstat( dir, &buff ) )
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{
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error = 1;
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show_perror = 1;
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}
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if( !( S_IFDIR & buff.st_mode ) )
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{
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error = 1;
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}
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if( error )
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{
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wchar_t *colon;
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sb_printf( sb_err,
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_(BUILTIN_SET_PATH_ERROR),
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L"set",
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dir,
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key );
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colon = wcschr( dir, L':' );
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if( colon && *(colon+1) )
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{
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show_hint = 1;
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}
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}
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if( show_perror )
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{
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builtin_wperror( L"set" );
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}
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if( show_hint )
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{
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sb_printf( sb_err,
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_(BUILTIN_SET_PATH_HINT),
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L"set",
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key,
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key,
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wcschr( dir, L':' )+1);
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}
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if( error )
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{
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break;
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}
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}
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if( error )
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{
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return 1;
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}
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}
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sb_init( &sb );
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if( al_get_count( val ) )
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{
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for( i=0; i<al_get_count( val ); i++ )
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{
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sb_append( &sb, (wchar_t *)al_get( val, i ) );
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if( i<al_get_count( val )-1 )
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{
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sb_append( &sb, ARRAY_SEP_STR );
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}
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}
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val_str = (wchar_t *)sb.buff;
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}
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switch( env_set( key, val_str, scope | ENV_USER ) )
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{
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case ENV_PERM:
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{
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sb_printf( sb_err, _(L"%ls: Tried to change the read-only variable '%ls'\n"), L"set", key );
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retcode=1;
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break;
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}
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case ENV_INVALID:
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{
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sb_printf( sb_err, _(L"%ls: Unknown error"), L"set" );
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retcode=1;
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break;
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}
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}
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sb_destroy( &sb );
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return retcode;
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}
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/**
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Extract indexes from a destination argument of the form name[index1 index2...]
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\param indexes the list to insert the new indexes into
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\param src the source string to parse
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\param name the name of the element. Return null if the name in \c src does not match this name
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\param var_count the number of elements in the array to parse.
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\return the total number of indexes parsed, or -1 on error
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*/
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static int parse_index( array_list_t *indexes,
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const wchar_t *src,
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const wchar_t *name,
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int var_count )
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{
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int len;
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int count = 0;
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const wchar_t *src_orig = src;
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if (src == 0)
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{
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return 0;
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}
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while (*src != L'\0' && (iswalnum(*src) || *src == L'_'))
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{
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src++;
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}
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if (*src != L'[')
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{
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sb_printf( sb_err, _(BUILTIN_SET_ARG_COUNT), L"set" );
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return 0;
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}
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len = src-src_orig;
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if( (wcsncmp( src_orig, name, len )!=0) || (wcslen(name) != (len)) )
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{
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sb_printf( sb_err,
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_(L"%ls: Multiple variable names specified in single call (%ls and %.*ls)\n"),
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L"set",
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name,
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len,
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src_orig);
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return 0;
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}
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src++;
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while (iswspace(*src))
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{
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src++;
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}
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while (*src != L']')
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{
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wchar_t *end;
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long l_ind = wcstol(src, &end, 10);
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int *ind;
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if (end == src)
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{
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sb_printf(sb_err, _(L"%ls: Invalid index starting at '%ls'\n"), L"set", src);
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return 0;
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}
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if( l_ind < 0 )
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{
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l_ind = var_count+l_ind+1;
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}
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ind = (int *) calloc(1, sizeof(int));
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*ind = (int) l_ind;
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al_push(indexes, ind);
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src = end;
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count++;
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while (iswspace(*src)) src++;
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}
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return count;
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}
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/**
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Update a list \c list by writing copies (using wcsdup) of the
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values specified by \c values to the indexes specified by \c
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indexes. The previous entries at the specidied position will be
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free'd.
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\return 0 if the operation was successfull, non-zero otherwise
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*/
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static int update_values( array_list_t *list,
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array_list_t *indexes,
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array_list_t *values )
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{
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int i;
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/* Replace values where needed */
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for( i = 0; i < al_get_count(indexes); i++ )
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{
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int ind = *(int *) al_get(indexes, i) - 1;
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void *new = (void *) al_get(values, i);
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if( ind <= 0 )
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{
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return 1;
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}
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free((void *) al_get(list, ind));
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al_set(list, ind, new != 0 ? wcsdup(new) : wcsdup(L""));
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}
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return 0;
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}
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/**
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Return 1 if an array list of int* pointers contains the specified
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value, 0 otherwise
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*/
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static int al_contains_int( array_list_t *list,
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int val)
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{
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int i;
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for (i = 0; i < al_get_count(list); i++)
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{
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int *current = (int *) al_get(list, i);
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if( current != 0 && *current == val )
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{
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return 1;
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}
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}
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return 0;
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}
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/**
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Erase from a list values at specified indexes
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*/
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static void erase_values(array_list_t *list, array_list_t *indexes)
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{
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int i;
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array_list_t result;
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al_init(&result);
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for (i = 0; i < al_get_count(list); i++)
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{
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if (!al_contains_int(indexes, i + 1))
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{
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al_push(&result, al_get(list, i));
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}
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else
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{
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free((void *) al_get(list, i));
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}
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}
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al_truncate(list,0);
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al_push_all( list, &result );
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al_destroy(&result);
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}
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/**
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Print the names of all environment variables in the scope, with or without values,
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with or without escaping
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*/
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static void print_variables(int include_values, int esc, int scope)
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{
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array_list_t names;
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int i;
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al_init( &names );
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env_get_names( &names, scope );
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sort_list( &names );
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for( i = 0; i < al_get_count(&names); i++ )
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{
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wchar_t *key = (wchar_t *)al_get( &names, i );
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wchar_t *e_key = esc ? escape(key, 1) : wcsdup(key);
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sb_append(sb_out, e_key);
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if( include_values )
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{
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wchar_t *value = env_get(key);
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wchar_t *e_value;
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e_value = esc ? expand_escape_variable(value) : wcsdup(value);
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sb_append2(sb_out, L" ", e_value, (void *)0);
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free(e_value);
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}
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sb_append(sb_out, L"\n");
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free(e_key);
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}
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al_destroy(&names);
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}
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/**
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The set builtin. Creates, updates and erases environment variables
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and environemnt variable arrays.
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*/
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static int builtin_set( wchar_t **argv )
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{
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/**
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Variables used for parsing the argument list
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*/
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const static struct woption
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long_options[] =
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{
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{
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L"export", no_argument, 0, 'x'
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}
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,
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{
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L"global", no_argument, 0, 'g'
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}
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,
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{
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L"local", no_argument, 0, 'l'
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}
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,
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{
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L"erase", no_argument, 0, 'e'
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}
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,
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{
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L"names", no_argument, 0, 'n'
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}
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,
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{
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L"unexport", no_argument, 0, 'u'
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}
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,
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{
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L"universal", no_argument, 0, 'U'
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}
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,
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{
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L"query", no_argument, 0, 'q'
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}
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,
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{
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L"help", no_argument, 0, 'h'
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}
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,
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{
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0, 0, 0, 0
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}
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}
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;
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const wchar_t *short_options = L"+xglenuUqh";
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int argc = builtin_count_args(argv);
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/*
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Flags to set the work mode
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*/
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int local = 0, global = 0, export = 0;
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int erase = 0, list = 0, unexport=0;
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int universal = 0, query=0;
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/*
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Variables used for performing the actual work
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*/
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wchar_t *dest = 0;
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int retcode=0;
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int scope;
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int slice=0;
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int i;
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/* Parse options to obtain the requested operation and the modifiers */
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woptind = 0;
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while (1)
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{
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int c = wgetopt_long(argc, argv, short_options, long_options, 0);
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if (c == -1)
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{
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break;
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}
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switch(c)
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{
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case 0:
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break;
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case 'e':
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erase = 1;
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break;
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case 'n':
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list = 1;
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break;
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case 'x':
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export = 1;
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break;
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case 'l':
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local = 1;
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break;
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case 'g':
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global = 1;
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break;
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case 'u':
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unexport = 1;
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break;
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case 'U':
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universal = 1;
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break;
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case 'q':
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query = 1;
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break;
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case 'h':
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builtin_print_help( argv[0], sb_out );
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return 0;
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case '?':
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builtin_print_help( argv[0], sb_err );
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return 1;
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default:
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break;
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}
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}
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/*
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Ok, all arguments have been parsed, let's validate them
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*/
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/*
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If we are checking the existance of a variable (-q) we can not
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also specify scope
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*/
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if( query && (erase || list || global || local || universal || export || unexport ) )
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{
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sb_printf(sb_err,
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BUILTIN_ERR_COMBO2,
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argv[0],
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parser_current_line() );
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builtin_print_help( argv[0], sb_err );
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return 1;
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}
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/* We can't both list and erase varaibles */
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if( erase && list )
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{
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sb_printf(sb_err,
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BUILTIN_ERR_COMBO2,
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argv[0],
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parser_current_line() );
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builtin_print_help( argv[0], sb_err );
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return 1;
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}
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/*
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Variables can only have one scope
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*/
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if( local + global + universal > 1 )
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{
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sb_printf( sb_err,
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BUILTIN_ERR_GLOCAL,
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argv[0],
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parser_current_line() );
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builtin_print_help( argv[0], sb_err );
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return 1;
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}
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/*
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Variables can only have one export status
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*/
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if( export && unexport )
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{
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sb_printf( sb_err,
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BUILTIN_ERR_EXPUNEXP,
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argv[0],
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parser_current_line() );
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builtin_print_help( argv[0], sb_err );
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return 1;
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}
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/*
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Calculate the scope value for variable assignement
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*/
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scope = (local ? ENV_LOCAL : 0) | (global ? ENV_GLOBAL : 0) | (export ? ENV_EXPORT : 0) | (unexport ? ENV_UNEXPORT : 0) | (universal ? ENV_UNIVERSAL:0) | ENV_USER;
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if( query )
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{
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/*
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Query mode. Return the number of variables that do not exist
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out of the specified variables.
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*/
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int i;
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for( i=woptind; i<argc; i++ )
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{
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if( !env_exist( argv[i], scope ) )
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{
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retcode++;
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}
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}
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return retcode;
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}
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if( woptind == argc )
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{
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/*
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Print values of variables
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*/
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if( erase )
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{
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sb_printf( sb_err,
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_(L"%ls: Erase needs a variable name\n%ls\n"),
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argv[0],
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parser_current_line() );
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builtin_print_help( argv[0], sb_err );
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retcode = 1;
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}
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else
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{
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print_variables( 1, 1, scope );
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}
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return retcode;
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}
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if( list )
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{
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/* Maybe we should issue an error if there are any other arguments? */
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print_variables(0, 0, scope);
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return 0;
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}
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if( !(dest = wcsdup(argv[woptind])))
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{
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DIE_MEM();
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}
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|
|
if( wcschr( dest, L'[' ) )
|
|
{
|
|
slice = 1;
|
|
*wcschr( dest, L'[' )=0;
|
|
}
|
|
|
|
if( !wcslen( dest ) )
|
|
{
|
|
free( dest );
|
|
sb_printf( sb_err, BUILTIN_ERR_VARNAME_ZERO, argv[0] );
|
|
builtin_print_help( argv[0], sb_err );
|
|
return 1;
|
|
}
|
|
|
|
if( slice && erase && (scope != ENV_USER) )
|
|
{
|
|
free( dest );
|
|
sb_printf( sb_err, _(L"%ls: Can not specify scope when erasing array slice\n"), argv[0] );
|
|
builtin_print_help( argv[0], sb_err );
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
set assignment can work in two modes, either using slices or
|
|
using the whole array. We detect which mode is used here.
|
|
*/
|
|
|
|
if( slice )
|
|
{
|
|
|
|
/*
|
|
Slice mode
|
|
*/
|
|
int idx_count, val_count;
|
|
array_list_t values;
|
|
array_list_t indexes;
|
|
array_list_t result;
|
|
|
|
al_init(&values);
|
|
al_init(&indexes);
|
|
al_init(&result);
|
|
|
|
tokenize_variable_array( env_get(dest), &result );
|
|
|
|
for( ; woptind<argc; woptind++ )
|
|
{
|
|
if( !parse_index( &indexes, argv[woptind], dest, al_get_count( &result ) ) )
|
|
{
|
|
builtin_print_help( argv[0], sb_err );
|
|
retcode = 1;
|
|
break;
|
|
}
|
|
|
|
val_count = argc-woptind-1;
|
|
idx_count = al_get_count( &indexes );
|
|
|
|
if( !erase )
|
|
{
|
|
if( val_count < idx_count )
|
|
{
|
|
sb_printf( sb_err, _(BUILTIN_SET_ARG_COUNT), argv[0] );
|
|
builtin_print_help( argv[0], sb_err );
|
|
retcode=1;
|
|
break;
|
|
}
|
|
if( val_count == idx_count )
|
|
{
|
|
woptind++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( !retcode )
|
|
{
|
|
/*
|
|
Slice indexes have been calculated, do the actual work
|
|
*/
|
|
|
|
if( erase )
|
|
{
|
|
erase_values(&result, &indexes);
|
|
my_env_set( dest, &result, scope);
|
|
}
|
|
else
|
|
{
|
|
array_list_t value;
|
|
al_init(&value);
|
|
|
|
while( woptind < argc )
|
|
{
|
|
al_push(&value, argv[woptind++]);
|
|
}
|
|
|
|
if( update_values( &result,
|
|
&indexes,
|
|
&value ) )
|
|
{
|
|
sb_printf( sb_err, L"%ls: ", argv[0] );
|
|
sb_printf( sb_err, ARRAY_BOUNDS_ERR );
|
|
sb_append( sb_err, L"\n" );
|
|
}
|
|
|
|
my_env_set(dest,
|
|
&result,
|
|
scope);
|
|
|
|
al_destroy( &value );
|
|
|
|
}
|
|
}
|
|
|
|
al_foreach( &result, &free );
|
|
al_destroy( &result );
|
|
|
|
al_foreach( &indexes, &free );
|
|
al_destroy(&indexes);
|
|
al_destroy(&values);
|
|
|
|
}
|
|
else
|
|
{
|
|
woptind++;
|
|
|
|
/*
|
|
No slicing
|
|
*/
|
|
if( erase )
|
|
{
|
|
if( woptind != argc )
|
|
{
|
|
sb_printf( sb_err,
|
|
_(L"%ls: Values cannot be specfied with erase\n%ls\n"),
|
|
argv[0],
|
|
parser_current_line() );
|
|
builtin_print_help( argv[0], sb_err );
|
|
retcode=1;
|
|
}
|
|
else
|
|
{
|
|
retcode = env_remove( dest, scope );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
array_list_t val;
|
|
al_init( &val );
|
|
|
|
for( i=woptind; i<argc; i++ )
|
|
{
|
|
al_push( &val, argv[i] );
|
|
}
|
|
|
|
retcode = my_env_set( dest, &val, scope );
|
|
|
|
al_destroy( &val );
|
|
|
|
}
|
|
}
|
|
|
|
free( dest );
|
|
|
|
return retcode;
|
|
|
|
}
|
|
|