106 lines
2.6 KiB
Modula-2
106 lines
2.6 KiB
Modula-2
This file is shift.def, from which is created shift.c.
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It implements the builtin "shift" in Bash.
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Copyright (C) 1987-2009 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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$PRODUCES shift.c
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#include <config.h>
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#if defined (HAVE_UNISTD_H)
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# ifdef _MINIX
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# include <sys/types.h>
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# endif
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# include <unistd.h>
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#endif
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#include "../bashansi.h"
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#include "../bashintl.h"
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#include "../shell.h"
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#include "common.h"
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$BUILTIN shift
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$FUNCTION shift_builtin
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$SHORT_DOC shift [n]
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Shift positional parameters.
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Rename the positional parameters $N+1,$N+2 ... to $1,$2 ... If N is
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not given, it is assumed to be 1.
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Exit Status:
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Returns success unless N is negative or greater than $#.
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$END
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int print_shift_error;
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/* Shift the arguments ``left''. Shift DOLLAR_VARS down then take one
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off of REST_OF_ARGS and place it into DOLLAR_VARS[9]. If LIST has
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anything in it, it is a number which says where to start the
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shifting. Return > 0 if `times' > $#, otherwise 0. */
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int
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shift_builtin (list)
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WORD_LIST *list;
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{
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intmax_t times;
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register int count;
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WORD_LIST *temp;
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CHECK_HELPOPT (list);
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if (get_numeric_arg (list, 0, ×) == 0)
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return (EXECUTION_FAILURE);
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if (times == 0)
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return (EXECUTION_SUCCESS);
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else if (times < 0)
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{
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sh_erange (list ? list->word->word : NULL, _("shift count"));
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return (EXECUTION_FAILURE);
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}
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else if (times > number_of_args ())
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{
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if (print_shift_error)
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sh_erange (list ? list->word->word : NULL, _("shift count"));
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return (EXECUTION_FAILURE);
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}
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while (times-- > 0)
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{
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if (dollar_vars[1])
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free (dollar_vars[1]);
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for (count = 1; count < 9; count++)
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dollar_vars[count] = dollar_vars[count + 1];
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if (rest_of_args)
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{
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temp = rest_of_args;
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dollar_vars[9] = savestring (temp->word->word);
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rest_of_args = rest_of_args->next;
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temp->next = (WORD_LIST *)NULL;
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dispose_words (temp);
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}
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else
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dollar_vars[9] = (char *)NULL;
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}
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invalidate_cached_quoted_dollar_at ();
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return (EXECUTION_SUCCESS);
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}
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