1 This file is shift.def, from which is created shift.c.
2 It implements the builtin "shift" in Bash.
4 Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
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 1, or (at your option) any later
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
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, 675 Mass Ave, Cambridge, MA 02139, USA.
24 #if defined (HAVE_STRING_H)
26 #else /* !HAVE_STRING_H */
28 #endif /* !HAVE_STRING_H */
33 $FUNCTION shift_builtin
35 The positional parameters from $N+1 ... are renamed to $1 ... If N is
36 not given, it is assumed to be 1.
39 /* Shift the arguments ``left''. Shift DOLLAR_VARS down then take one
40 off of REST_OF_ARGS and place it into DOLLAR_VARS[9]. If LIST has
41 anything in it, it is a number which says where to start the
42 shifting. Return > 0 if `times' > $#, otherwise 0. */
50 times = get_numeric_arg (list);
53 return (EXECUTION_SUCCESS);
57 builtin_error ("shift count must be >= 0");
58 return (EXECUTION_FAILURE);
61 args = list_rest_of_args ();
62 number = list_length (args);
67 builtin_error ("shift count must be <= $#");
68 return (EXECUTION_FAILURE);
76 free (dollar_vars[1]);
78 for (count = 1; count < 9; count++)
79 dollar_vars[count] = dollar_vars[count + 1];
83 WORD_LIST *temp = rest_of_args;
85 dollar_vars[9] = savestring (temp->word->word);
86 rest_of_args = rest_of_args->next;
87 temp->next = (WORD_LIST *)NULL;
91 dollar_vars[9] = (char *)NULL;
94 return (EXECUTION_SUCCESS);