builtins/alias.def

   1 This file is alias.def, from which is created alias.c
   2 It implements the builtins "alias" and "unalias" in Bash.
   3
   4 Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
   5
   6 This file is part of GNU Bash, the Bourne Again SHell.
   7
   8 Bash is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License along
  19 with Bash; see the file COPYING.  If not, write to the Free Software
  20 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
  21
  22 $BUILTIN alias
  23 $FUNCTION alias_builtin
  24 $DEPENDS_ON ALIAS
  25 $PRODUCES alias.c
  26 $SHORT_DOC alias [-p] [name[=value] ... ]
  27 `alias' with no arguments or with the -p option prints the list
  28 of aliases in the form alias NAME=VALUE on standard output.
  29 Otherwise, an alias is defined for each NAME whose VALUE is given.
  30 A trailing space in VALUE causes the next word to be checked for
  31 alias substitution when the alias is expanded.  Alias returns
  32 true unless a NAME is given for which no alias has been defined.
  33 $END
  34
  35 #include <config.h>
  36
  37 #if defined (ALIAS)
  38
  39 #if defined (HAVE_UNISTD_H)
  40 #  ifdef _MINIX
  41 #    include <sys/types.h>
  42 #  endif
  43 #  include <unistd.h>
  44 #endif
  45
  46 #  include "../bashansi.h"
  47
  48 #  include <stdio.h>
  49 #  include "../shell.h"
  50 #  include "../alias.h"
  51 #  include "common.h"
  52 #  include "bashgetopt.h"
  53
  54 extern int interactive;
  55 static void print_alias ();
  56
  57 /* Hack the alias command in a Korn shell way. */
  58 int
  59 alias_builtin (list)
  60      WORD_LIST *list;
  61 {
  62   int any_failed, offset, pflag;
  63   alias_t **alias_list, *t;
  64   char *name, *value;
  65
  66   pflag = 0;
  67   reset_internal_getopt ();
  68   while ((offset = internal_getopt (list, "p")) != -1)
  69     {
  70       switch (offset)
  71         {
  72         case 'p':
  73           pflag = 1;
  74           break;
  75         default:
  76           builtin_usage ();
  77           return (EX_USAGE);
  78         }
  79     }
  80
  81   list = loptend;
  82
  83   if (list == 0 || pflag)
  84     {
  85       if (aliases == 0)
  86         return (EXECUTION_SUCCESS);
  87
  88       alias_list = all_aliases ();
  89
  90       if (alias_list == 0)
  91         return (EXECUTION_SUCCESS);
  92
  93       for (offset = 0; alias_list[offset]; offset++)
  94         print_alias (alias_list[offset]);
  95
  96       free (alias_list);        /* XXX - Do not free the strings. */
  97
  98       if (list == 0)
  99         return (EXECUTION_SUCCESS);
 100     }
 101
 102   any_failed = 0;
 103   while (list)
 104     {
 105       name = list->word->word;
 106
 107       for (offset = 0; name[offset] && name[offset] != '='; offset++)
 108         ;
 109
 110       if (offset && name[offset] == '=')
 111         {
 112           name[offset] = '\0';
 113           value = name + offset + 1;
 114
 115           add_alias (name, value);
 116         }
 117       else
 118         {
 119           t = find_alias (name);
 120           if (t)
 121             print_alias (t);
 122           else
 123             {
 124               builtin_error ("`%s' not found", name);
 125               any_failed++;
 126             }
 127         }
 128       list = list->next;
 129     }
 130
 131   return (any_failed ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
 132 }
 133 #endif /* ALIAS */
 134
 135 $BUILTIN unalias
 136 $FUNCTION unalias_builtin
 137 $DEPENDS_ON ALIAS
 138 $SHORT_DOC unalias [-a] [name ...]
 139 Remove NAMEs from the list of defined aliases.  If the -a option is given,
 140 then remove all alias definitions.
 141 $END
 142
 143 #if defined (ALIAS)
 144 /* Remove aliases named in LIST from the aliases database. */
 145 int
 146 unalias_builtin (list)
 147      register WORD_LIST *list;
 148 {
 149   register alias_t *alias;
 150   int opt, aflag;
 151
 152   aflag = 0;
 153   reset_internal_getopt ();
 154   while ((opt = internal_getopt (list, "a")) != -1)
 155     {
 156       switch (opt)
 157         {
 158         case 'a':
 159           aflag = 1;
 160           break;
 161         default:
 162           builtin_usage ();
 163           return (EX_USAGE);
 164         }
 165     }
 166
 167   list = loptend;
 168
 169   if (aflag)
 170     {
 171       delete_all_aliases ();
 172       return (EXECUTION_SUCCESS);
 173     }
 174
 175   aflag = 0;
 176   while (list)
 177     {
 178       alias = find_alias (list->word->word);
 179
 180       if (alias)
 181         remove_alias (alias->name);
 182       else
 183         {
 184           builtin_error ("`%s': not an alias", list->word->word);
 185           aflag++;
 186         }
 187
 188       list = list->next;
 189     }
 190
 191   return (aflag ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
 192 }
 193
 194 /* Output ALIAS in such a way as to allow it to be read back in. */
 195 static void
 196 print_alias (alias)
 197      alias_t *alias;
 198 {
 199   char *value;
 200
 201   value = sh_single_quote (alias->value);
 202   printf ("alias %s=%s\n", alias->name, value);
 203   free (value);
 204
 205   fflush (stdout);
 206 }
 207 #endif /* ALIAS */