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+This file is history.def, from which is created history.c.
+It implements the builtin "history" in Bash.
+
+Copyright (C) 1987-2020 Free Software Foundation, Inc.
+
+This file is part of GNU Bash, the Bourne Again SHell.
+
+Bash is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Bash is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Bash. If not, see <http://www.gnu.org/licenses/>.
+
+$PRODUCES history.c
+
+$BUILTIN history
+$FUNCTION history_builtin
+$DEPENDS_ON HISTORY
+$SHORT_DOC history [-c] [-d offset] [n] or history -anrw [filename] or history -ps arg [arg...]
+Display or manipulate the history list.
+
+Display the history list with line numbers, prefixing each modified
+entry with a `*'. An argument of N lists only the last N entries.
+
+Options:
+ -c clear the history list by deleting all of the entries
+ -d offset delete the history entry at position OFFSET. Negative
+ offsets count back from the end of the history list
+
+ -a append history lines from this session to the history file
+ -n read all history lines not already read from the history file
+ and append them to the history list
+ -r read the history file and append the contents to the history
+ list
+ -w write the current history to the history file
+
+ -p perform history expansion on each ARG and display the result
+ without storing it in the history list
+ -s append the ARGs to the history list as a single entry
+
+If FILENAME is given, it is used as the history file. Otherwise,
+if HISTFILE has a value, that is used, else ~/.bash_history.
+
+If the HISTTIMEFORMAT variable is set and not null, its value is used
+as a format string for strftime(3) to print the time stamp associated
+with each displayed history entry. No time stamps are printed otherwise.
+
+Exit Status:
+Returns success unless an invalid option is given or an error occurs.
+$END
+
+#include <config.h>
+
+#if defined (HISTORY)
+#include "../bashtypes.h"
+#if ! defined(_MINIX) && defined (HAVE_SYS_FILE_H)
+# include <sys/file.h>
+#endif
+#include "posixstat.h"
+#include "filecntl.h"
+#include <errno.h>
+#include <stdio.h>
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include "../bashansi.h"
+#include "../bashintl.h"
+
+#include "../shell.h"
+#include "../flags.h"
+#include "../parser.h"
+#include "../bashhist.h"
+#include <readline/history.h>
+#include "bashgetopt.h"
+#include "common.h"
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+static char *histtime PARAMS((HIST_ENTRY *, const char *));
+static int display_history PARAMS((WORD_LIST *));
+static void push_history PARAMS((WORD_LIST *));
+static int expand_and_print_history PARAMS((WORD_LIST *));
+
+#define AFLAG 0x01
+#define RFLAG 0x02
+#define WFLAG 0x04
+#define NFLAG 0x08
+#define SFLAG 0x10
+#define PFLAG 0x20
+#define CFLAG 0x40
+#define DFLAG 0x80
+
+int
+history_builtin (list)
+ WORD_LIST *list;
+{
+ int flags, opt, result, old_history_lines, obase, ind;
+ char *filename, *delete_arg, *range;
+ intmax_t delete_offset;
+
+ flags = 0;
+ reset_internal_getopt ();
+ while ((opt = internal_getopt (list, "acd:npsrw")) != -1)
+ {
+ switch (opt)
+ {
+ case 'a':
+ flags |= AFLAG;
+ break;
+ case 'c':
+ flags |= CFLAG;
+ break;
+ case 'n':
+ flags |= NFLAG;
+ break;
+ case 'r':
+ flags |= RFLAG;
+ break;
+ case 'w':
+ flags |= WFLAG;
+ break;
+ case 's':
+ flags |= SFLAG;
+ break;
+ case 'd':
+ flags |= DFLAG;
+ delete_arg = list_optarg;
+ break;
+ case 'p':
+#if defined (BANG_HISTORY)
+ flags |= PFLAG;
+#endif
+ break;
+ CASE_HELPOPT;
+ default:
+ builtin_usage ();
+ return (EX_USAGE);
+ }
+ }
+ list = loptend;
+
+ opt = flags & (AFLAG|RFLAG|WFLAG|NFLAG);
+ if (opt && opt != AFLAG && opt != RFLAG && opt != WFLAG && opt != NFLAG)
+ {
+ builtin_error (_("cannot use more than one of -anrw"));
+ return (EXECUTION_FAILURE);
+ }
+
+ /* clear the history, but allow other arguments to add to it again. */
+ if (flags & CFLAG)
+ {
+ bash_clear_history ();
+ if (list == 0)
+ return (EXECUTION_SUCCESS);
+ }
+
+ if (flags & SFLAG)
+ {
+ if (list)
+ push_history (list);
+ return (EXECUTION_SUCCESS);
+ }
+#if defined (BANG_HISTORY)
+ else if (flags & PFLAG)
+ {
+ if (list)
+ return (expand_and_print_history (list));
+ return (sh_chkwrite (EXECUTION_SUCCESS));
+ }
+#endif
+ else if ((flags & DFLAG) && (range = strchr ((delete_arg[0] == '-') ? delete_arg + 1 : delete_arg, '-')))
+ {
+ intmax_t delete_start, delete_end;
+ *range++ = '\0';
+ if (legal_number (delete_arg, &delete_start) == 0 || legal_number (range, &delete_end) == 0)
+ {
+ range[-1] = '-';
+ sh_erange (delete_arg, _("history position"));
+ return (EXECUTION_FAILURE);
+ }
+ if (delete_arg[0] == '-' && delete_start < 0)
+ {
+ /* the_history[history_length] == 0x0, so this is correct */
+ delete_start += history_length;
+ if (delete_start < history_base)
+ {
+start_error:
+ sh_erange (delete_arg, _("history position"));
+ return (EXECUTION_FAILURE);
+ }
+ }
+ /* numbers as displayed by display_history are offset by history_base */
+ else if (delete_start > 0)
+ delete_start -= history_base;
+ if (delete_start < 0 || delete_start >= history_length)
+ goto start_error;
+ if (range[0] == '-' && delete_end < 0)
+ {
+ delete_end += history_length;
+ if (delete_end < history_base)
+ {
+range_error:
+ sh_erange (range, _("history position"));
+ return (EXECUTION_FAILURE);
+ }
+ }
+ else if (delete_end > 0)
+ delete_end -= history_base;
+ if (delete_end < 0 || delete_end >= history_length)
+ goto range_error;
+ result = bash_delete_history_range (delete_start, delete_end);
+ if (where_history () > history_length)
+ history_set_pos (history_length);
+ return (result ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
+ }
+ else if (flags & DFLAG)
+ {
+ if (legal_number (delete_arg, &delete_offset) == 0)
+ {
+ sh_erange (delete_arg, _("history position"));
+ return (EXECUTION_FAILURE);
+ }
+ /* check for negative offsets, count back from end of list */
+ if (delete_arg[0] == '-' && delete_offset < 0)
+ {
+ /* since the_history[history_length] == 0x0, this calculation means
+ that history -d -1 will delete the last history entry, which at
+ this point is the history -d -1 we just added. */
+ ind = history_length + delete_offset;
+ if (ind < history_base)
+ {
+ sh_erange (delete_arg, _("history position"));
+ return (EXECUTION_FAILURE);
+ }
+ opt = ind + history_base; /* compensate for opt - history_base below */
+ }
+ else if ((delete_offset < history_base) || (delete_offset >= (history_base + history_length)))
+ {
+ sh_erange (delete_arg, _("history position"));
+ return (EXECUTION_FAILURE);
+ }
+ else
+ opt = delete_offset;
+
+ /* Positive arguments from numbers as displayed by display_history need
+ to be offset by history_base */
+ result = bash_delete_histent (opt - history_base);
+ /* Since remove_history changes history_length, this can happen if
+ we delete the last history entry. */
+ if (where_history () > history_length)
+ history_set_pos (history_length);
+ return (result ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
+ }
+ else if ((flags & (AFLAG|RFLAG|NFLAG|WFLAG|CFLAG)) == 0)
+ {
+ result = display_history (list);
+ return (sh_chkwrite (result));
+ }
+
+ filename = list ? list->word->word : get_string_value ("HISTFILE");
+ result = EXECUTION_SUCCESS;
+
+#if defined (RESTRICTED_SHELL)
+ if (restricted && strchr (filename, '/'))
+ {
+ sh_restricted (filename);
+ return (EXECUTION_FAILURE);
+ }
+#endif
+
+ if (flags & AFLAG) /* Append session's history to file. */
+ result = maybe_append_history (filename);
+ else if (flags & WFLAG) /* Write entire history. */
+ result = write_history (filename);
+ else if (flags & RFLAG) /* Read entire file. */
+ {
+ result = read_history (filename);
+ history_lines_in_file = history_lines_read_from_file;
+ /* history_lines_in_file = where_history () + history_base - 1; */
+ }
+ else if (flags & NFLAG) /* Read `new' history from file. */
+ {
+ /* Read all of the lines in the file that we haven't already read. */
+ old_history_lines = history_lines_in_file;
+ obase = history_base;
+
+ using_history ();
+ result = read_history_range (filename, history_lines_in_file, -1);
+ using_history ();
+
+ history_lines_in_file = history_lines_read_from_file;
+ /* history_lines_in_file = where_history () + history_base - 1; */
+
+ /* If we're rewriting the history file at shell exit rather than just
+ appending the lines from this session to it, the question is whether
+ we reset history_lines_this_session to 0, losing any history entries
+ we had before we read the new entries from the history file, or
+ whether we count the new entries we just read from the file as
+ history lines added during this session.
+ Right now, we do the latter. This will cause these history entries
+ to be written to the history file along with any intermediate entries
+ we add when we do a `history -a', but the alternative is losing
+ them altogether. */
+ if (force_append_history == 0)
+ history_lines_this_session += history_lines_in_file - old_history_lines +
+ history_base - obase;
+ }
+
+ return (result ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
+}
+
+/* Accessors for HIST_ENTRY lists that are called HLIST. */
+#define histline(i) (hlist[(i)]->line)
+#define histdata(i) (hlist[(i)]->data)
+
+static char *
+histtime (hlist, histtimefmt)
+ HIST_ENTRY *hlist;
+ const char *histtimefmt;
+{
+ static char timestr[128];
+ time_t t;
+ struct tm *tm;
+
+ t = history_get_time (hlist);
+ tm = t ? localtime (&t) : 0;
+ if (t && tm)
+ strftime (timestr, sizeof (timestr), histtimefmt, tm);
+ else if (hlist->timestamp && hlist->timestamp[0])
+ snprintf (timestr, sizeof (timestr), _("%s: invalid timestamp"),
+ (hlist->timestamp[0] == '#') ? hlist->timestamp + 1: hlist->timestamp);
+ else
+ strcpy (timestr, "??");
+ return timestr;
+}
+
+static int
+display_history (list)
+ WORD_LIST *list;
+{
+ register int i;
+ intmax_t limit;
+ HIST_ENTRY **hlist;
+ char *histtimefmt, *timestr;
+
+ if (list)
+ {
+ if (get_numeric_arg (list, 0, &limit) == 0)
+ return (EXECUTION_FAILURE);
+
+ if (limit < 0)
+ limit = -limit;
+ }
+ else
+ limit = -1;
+
+ hlist = history_list ();
+
+ if (hlist)
+ {
+ for (i = 0; hlist[i]; i++)
+ ;
+
+ if (0 <= limit && limit < i)
+ i -= limit;
+ else
+ i = 0;
+
+ histtimefmt = get_string_value ("HISTTIMEFORMAT");
+
+ while (hlist[i])
+ {
+ QUIT;
+
+ timestr = (histtimefmt && *histtimefmt) ? histtime (hlist[i], histtimefmt) : (char *)NULL;
+ printf ("%5d%c %s%s\n", i + history_base,
+ histdata(i) ? '*' : ' ',
+ ((timestr && *timestr) ? timestr : ""),
+ histline(i));
+ i++;
+ }
+ }
+
+ return (EXECUTION_SUCCESS);
+}
+
+/* Remove the last entry in the history list and add each argument in
+ LIST to the history. */
+static void
+push_history (list)
+ WORD_LIST *list;
+{
+ char *s;
+
+ /* Delete the last history entry if it was a single entry added to the
+ history list (generally the `history -s' itself), or if `history -s'
+ is being used in a compound command and the compound command was
+ added to the history as a single element (command-oriented history).
+ If you don't want history -s to remove the compound command from the
+ history, change #if 0 to #if 1 below. */
+#if 0
+ if (remember_on_history && hist_last_line_pushed == 0 &&
+ hist_last_line_added && bash_delete_last_history () == 0)
+#else
+ if (remember_on_history && hist_last_line_pushed == 0 &&
+ (hist_last_line_added ||
+ (current_command_line_count > 0 && current_command_first_line_saved && command_oriented_history))
+ && bash_delete_last_history () == 0)
+#endif
+ return;
+
+ s = string_list (list);
+ /* Call check_add_history with FORCE set to 1 to skip the check against
+ current_command_line_count. If history -s is used in a compound
+ command, the above code will delete the compound command's history
+ entry and this call will add the line to the history as a separate
+ entry. Without FORCE=1, if current_command_line_count were > 1, the
+ line would be appended to the entry before the just-deleted entry. */
+ check_add_history (s, 1); /* obeys HISTCONTROL, HISTIGNORE */
+
+ hist_last_line_pushed = 1; /* XXX */
+ free (s);
+}
+
+#if defined (BANG_HISTORY)
+static int
+expand_and_print_history (list)
+ WORD_LIST *list;
+{
+ char *s;
+ int r, result;
+
+ if (hist_last_line_pushed == 0 && hist_last_line_added && bash_delete_last_history () == 0)
+ return EXECUTION_FAILURE;
+ result = EXECUTION_SUCCESS;
+ while (list)
+ {
+ r = history_expand (list->word->word, &s);
+ if (r < 0)
+ {
+ builtin_error (_("%s: history expansion failed"), list->word->word);
+ result = EXECUTION_FAILURE;
+ }
+ else
+ {
+ fputs (s, stdout);
+ putchar ('\n');
+ }
+ FREE (s);
+ list = list->next;
+ }
+ fflush (stdout);
+ return result;
+}
+#endif /* BANG_HISTORY */
+#endif /* HISTORY */
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