builtins/return.def

   1 This file is return.def, from which is created return.c.
   2 It implements the builtin "return" in Bush.
   3
   4 Copyright (C) 1987-2015 Free Software Foundation, Inc.
   5
   6 This file is part of GNU Bush, the Bourne Again SHell.
   7
   8 Bush is free software: you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation, either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 Bush is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with Bush.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 $PRODUCES return.c
  22
  23 $BUILTIN return
  24
  25 $FUNCTION return_builtin
  26 $SHORT_DOC return [n]
  27 Return from a shell function.
  28
  29 Causes a function or sourced script to exit with the return value
  30 specified by N.  If N is omitted, the return status is that of the
  31 last command executed within the function or script.
  32
  33 Exit Status:
  34 Returns N, or failure if the shell is not executing a function or script.
  35 $END
  36
  37 #include <config.h>
  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 "../src/bushintl.h"
  47
  48 #include "../src/shell.h"
  49 #include "../src/runner/execute_cmd.h"
  50 #include "common.h"
  51 #include "bushgetopt.h"
  52
  53 /* If we are executing a user-defined function then exit with the value
  54    specified as an argument.  if no argument is given, then the last
  55    exit status is used. */
  56 int
  57 return_builtin (list)
  58      WORD_LIST *list;
  59 {
  60   CHECK_HELPOPT (list);
  61
  62   return_catch_value = get_exitstat (list);
  63
  64   if (return_catch_flag)
  65     sh_longjmp (return_catch, 1);
  66   else
  67     {
  68       builtin_error (_("can only `return' from a function or sourced script"));
  69       return (EX_USAGE);
  70     }
  71 }
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83