| 1 | This file is shift.def, from which is created shift.c.
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| 2 | It implements the builtin "shift" in Bash.
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| 3 |
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| 4 | Copyright (C) 1987-2003 Free Software Foundation, Inc.
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| 5 |
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| 6 | This file is part of GNU Bash, the Bourne Again SHell.
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| 7 |
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| 8 | Bash is free software; you can redistribute it and/or modify it under
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| 9 | the terms of the GNU General Public License as published by the Free
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| 10 | Software Foundation; either version 2, or (at your option) any later
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| 11 | version.
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| 12 |
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| 13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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| 14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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| 16 | for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License along
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| 19 | with Bash; see the file COPYING. If not, write to the Free Software
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| 20 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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| 21 |
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| 22 | $PRODUCES shift.c
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| 23 |
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| 24 | #include <config.h>
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| 25 |
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| 26 | #if defined (HAVE_UNISTD_H)
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| 27 | # ifdef _MINIX
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| 28 | # include <sys/types.h>
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| 29 | # endif
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| 30 | # include <unistd.h>
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| 31 | #endif
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| 32 |
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| 33 | #include "../bashansi.h"
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| 34 | #include "../bashintl.h"
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| 35 |
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| 36 | #include "../shell.h"
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| 37 | #include "common.h"
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| 38 |
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| 39 | $BUILTIN shift
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| 40 | $FUNCTION shift_builtin
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| 41 | $SHORT_DOC shift [n]
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| 42 | The positional parameters from $N+1 ... are renamed to $1 ... If N is
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| 43 | not given, it is assumed to be 1.
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| 44 | $END
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| 45 |
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| 46 | int print_shift_error;
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| 47 |
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| 48 | /* Shift the arguments ``left''. Shift DOLLAR_VARS down then take one
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| 49 | off of REST_OF_ARGS and place it into DOLLAR_VARS[9]. If LIST has
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| 50 | anything in it, it is a number which says where to start the
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| 51 | shifting. Return > 0 if `times' > $#, otherwise 0. */
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| 52 | int
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| 53 | shift_builtin (list)
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| 54 | WORD_LIST *list;
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| 55 | {
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| 56 | intmax_t times;
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| 57 | register int count;
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| 58 | WORD_LIST *temp;
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| 59 |
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| 60 | times = get_numeric_arg (list, 0);
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| 61 |
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| 62 | if (times == 0)
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| 63 | return (EXECUTION_SUCCESS);
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| 64 | else if (times < 0)
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| 65 | {
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| 66 | sh_erange (list ? list->word->word : NULL, _("shift count"));
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| 67 | return (EXECUTION_FAILURE);
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| 68 | }
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| 69 | else if (times > number_of_args ())
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| 70 | {
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| 71 | if (print_shift_error)
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| 72 | sh_erange (list ? list->word->word : NULL, _("shift count"));
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| 73 | return (EXECUTION_FAILURE);
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| 74 | }
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| 75 |
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| 76 | while (times-- > 0)
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| 77 | {
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| 78 | if (dollar_vars[1])
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| 79 | free (dollar_vars[1]);
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| 80 |
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| 81 | for (count = 1; count < 9; count++)
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| 82 | dollar_vars[count] = dollar_vars[count + 1];
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| 83 |
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| 84 | if (rest_of_args)
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| 85 | {
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| 86 | temp = rest_of_args;
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| 87 | dollar_vars[9] = savestring (temp->word->word);
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| 88 | rest_of_args = rest_of_args->next;
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| 89 | temp->next = (WORD_LIST *)NULL;
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| 90 | dispose_words (temp);
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| 91 | }
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| 92 | else
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| 93 | dollar_vars[9] = (char *)NULL;
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| 94 | }
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| 95 | return (EXECUTION_SUCCESS);
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| 96 | }
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