128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/* strftime - loadable builtin interface to strftime(3) */
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/* See Makefile for compilation details. */
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/*
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Copyright (C) 1999-2009 Free Software Foundation, Inc.
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This file is part of GNU Bash.
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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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*/
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#include <config.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include "bashtypes.h"
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#include "posixtime.h"
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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#include "common.h"
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#include "bashgetopt.h"
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int
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strftime_builtin (list)
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WORD_LIST *list;
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{
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char *format, *tbuf;
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size_t tbsize, tsize;
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time_t secs;
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struct tm *t;
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int n;
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intmax_t i;
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if (no_options (list))
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return (EX_USAGE);
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list = loptend;
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if (list == 0)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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format = list->word->word;
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if (format == 0 || *format == 0)
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{
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printf ("\n");
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return (EXECUTION_SUCCESS);
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}
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list = list->next;
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if (list && list->word->word)
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{
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n = legal_number (list->word->word, &i);
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if (n == 0 || i < 0 || i != (time_t)i)
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{
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sh_invalidnum (list->word->word);
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return (EXECUTION_FAILURE);
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}
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else
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secs = i;
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}
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else
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secs = NOW;
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t = localtime (&secs);
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tbsize = strlen (format) * 4;
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tbuf = 0;
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/* Now try to figure out how big the buffer should really be. strftime(3)
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will return the number of bytes placed in the buffer unless it's greater
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than MAXSIZE, in which case it returns 0. */
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for (n = 1; n <= 8; n++)
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{
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tbuf = xrealloc (tbuf, tbsize * n);
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tsize = strftime (tbuf, tbsize * n, format, t);
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if (tsize)
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break;
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}
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if (tsize)
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printf ("%s\n", tbuf);
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free (tbuf);
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return (EXECUTION_SUCCESS);
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}
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/* An array of strings forming the `long' documentation for a builtin xxx,
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which is printed by `help xxx'. It must end with a NULL. */
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char *strftime_doc[] = {
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"Display formatted time.",
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"",
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"Converts date and time format to a string and displays it on the",
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"standard output. If the optional second argument is supplied, it",
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"is used as the number of seconds since the epoch to use in the",
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"conversion, otherwise the current time is used.",
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(char *)NULL
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};
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/* The standard structure describing a builtin command. bash keeps an array
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of these structures. The flags must include BUILTIN_ENABLED so the
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builtin can be used. */
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struct builtin strftime_struct = {
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"strftime", /* builtin name */
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strftime_builtin, /* function implementing the builtin */
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BUILTIN_ENABLED, /* initial flags for builtin */
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strftime_doc, /* array of long documentation strings. */
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"strftime format [seconds]", /* usage synopsis; becomes short_doc */
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0 /* reserved for internal use */
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};
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