readline.c

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/*	$NetBSD: readline.c,v 1.49 2005/03/10 19:34:46 christos Exp $	*/

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jaromir Dolecek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/* AIX requires this to be the first thing in the file.  */
#if defined (_AIX) && !defined (__GNUC__)
 #pragma alloca
#endif

#include <config.h>

#ifdef __GNUC__
# undef alloca
# define alloca(n) __builtin_alloca (n)
#else
# ifdef HAVE_ALLOCA_H
#  include <alloca.h>
# else
#  ifndef _AIX
extern char *alloca ();
#  endif
# endif
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <pwd.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <fcntl.h>
#include <vis.h>

#include "readline/readline.h"
#include "el.h"
#include "fcns.h"		/* for EL_NUM_FCNS */
#include "histedit.h"

/* for rl_complete() */
#define TAB		'\r'

/* see comment at the #ifdef for sense of this */
/* #define GDB_411_HACK */

/* readline compatibility stuff - look at readline sources/documentation */
/* to see what these variables mean */
const char *rl_library_version = "EditLine wrapper";
static char empty[] = { '\0' };
static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
    '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
char *rl_readline_name = empty;
FILE *rl_instream = NULL;
FILE *rl_outstream = NULL;
int rl_point = 0;
int rl_end = 0;
char *rl_line_buffer = NULL;
VFunction *rl_linefunc = NULL;
int rl_done = 0;
VFunction *rl_event_hook = NULL;

int history_base = 1;		/* probably never subject to change */
int history_length = 0;
int max_input_history = 0;
char history_expansion_char = '!';
char history_subst_char = '^';
char *history_no_expand_chars = expand_chars;
Function *history_inhibit_expansion_function = NULL;
char *history_arg_extract(int start, int end, const char *str);

int rl_inhibit_completion = 0;
int rl_attempted_completion_over = 0;
char *rl_basic_word_break_characters = break_chars;
char *rl_completer_word_break_characters = NULL;
char *rl_completer_quote_characters = NULL;
Function *rl_completion_entry_function = NULL;
CPPFunction *rl_attempted_completion_function = NULL;
Function *rl_pre_input_hook = NULL;
Function *rl_startup1_hook = NULL;
Function *rl_getc_function = NULL;
char *rl_terminal_name = NULL;
int rl_already_prompted = 0;
int rl_filename_completion_desired = 0;
int rl_ignore_completion_duplicates = 0;
int rl_catch_signals = 1;
VFunction *rl_redisplay_function = NULL;
Function *rl_startup_hook = NULL;
VFunction *rl_completion_display_matches_hook = NULL;
VFunction *rl_prep_term_function = NULL;
VFunction *rl_deprep_term_function = NULL;

/*
 * The current prompt string.
 */
char *rl_prompt = NULL;
/*
 * This is set to character indicating type of completion being done by
 * rl_complete_internal(); this is available for application completion
 * functions.
 */
int rl_completion_type = 0;

/*
 * If more than this number of items results from query for possible
 * completions, we ask user if they are sure to really display the list.
 */
int rl_completion_query_items = 100;

/*
 * List of characters which are word break characters, but should be left
 * in the parsed text when it is passed to the completion function.
 * Shell uses this to help determine what kind of completing to do.
 */
char *rl_special_prefixes = (char *)NULL;

/*
 * This is the character appended to the completed words if at the end of
 * the line. Default is ' ' (a space).
 */
int rl_completion_append_character = ' ';

/* stuff below is used internally by libedit for readline emulation */

/* if not zero, non-unique completions always show list of possible matches */
static int _rl_complete_show_all = 0;

static History *h = NULL;
static EditLine *e = NULL;
static Function *map[256];
static int el_rl_complete_cmdnum = 0;

/* internal functions */
static unsigned char	 _el_rl_complete(EditLine *, int);
static unsigned char	 _el_rl_tstp(EditLine *, int);
static char		*_get_prompt(EditLine *);
static HIST_ENTRY	*_move_history(int);
static int		 _history_expand_command(const char *, size_t, size_t,
    char **);
static char		*_rl_compat_sub(const char *, const char *,
    const char *, int);
static int		 _rl_complete_internal(int);
static int		 _rl_qsort_string_compare(const void *, const void *);
static int		 _rl_event_read_char(EditLine *, char *);
static void		 _rl_update_pos(void);


/* ARGSUSED */
static char *
_get_prompt(EditLine *el __attribute__((__unused__)))
{
	rl_already_prompted = 1;
	return (rl_prompt);
}


/*
 * generic function for moving around history
 */
static HIST_ENTRY *
_move_history(int op)
{
	HistEvent ev;
	static HIST_ENTRY rl_he;

	if (history(h, &ev, op) != 0)
		return (HIST_ENTRY *) NULL;

	rl_he.line = ev.str;
	rl_he.data = (histdata_t) &(ev.num);

	return (&rl_he);
}


/*
 * READLINE compatibility stuff
 */

/*
 * initialize rl compat stuff
 */
int
rl_initialize(void)
{
	HistEvent ev;
	const LineInfo *li;
	int i;
	int editmode = 1;
	struct termios t;

	if (e != NULL)
		el_end(e);
	if (h != NULL)
		history_end(h);

	if (!rl_instream)
		rl_instream = stdin;
	if (!rl_outstream)
		rl_outstream = stdout;

	/*
	 * See if we don't really want to run the editor
	 */
	if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
		editmode = 0;

	e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);

	if (!editmode)
		el_set(e, EL_EDITMODE, 0);

	h = history_init();
	if (!e || !h)
		return (-1);

	history(h, &ev, H_SETSIZE, INT_MAX);	/* unlimited */
	history_length = 0;
	max_input_history = INT_MAX;
	el_set(e, EL_HIST, history, h);

	/* for proper prompt printing in readline() */
	rl_prompt = strdup("");
	if (rl_prompt == NULL) {
		history_end(h);
		el_end(e);
		return -1;
	}
	el_set(e, EL_PROMPT, _get_prompt);
	el_set(e, EL_SIGNAL, rl_catch_signals);

	/* set default mode to "emacs"-style and read setting afterwards */
	/* so this can be overriden */
	el_set(e, EL_EDITOR, "emacs");
	if (rl_terminal_name != NULL)
		el_set(e, EL_TERMINAL, rl_terminal_name);
	else
		el_get(e, EL_TERMINAL, &rl_terminal_name);

	/*
	 * Word completion - this has to go AFTER rebinding keys
	 * to emacs-style.
	 */
	el_set(e, EL_ADDFN, "rl_complete",
	    "ReadLine compatible completion function",
	    _el_rl_complete);
	el_set(e, EL_BIND, "^I", "rl_complete", NULL);

	/*
	 * Send TSTP when ^Z is pressed.
	 */
	el_set(e, EL_ADDFN, "rl_tstp",
	    "ReadLine compatible suspend function",
	    _el_rl_tstp);
	el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);

	/*
	 * Find out where the rl_complete function was added; this is
	 * used later to detect that lastcmd was also rl_complete.
	 */
	for(i=EL_NUM_FCNS; i < e->el_map.nfunc; i++) {
		if (e->el_map.func[i] == _el_rl_complete) {
			el_rl_complete_cmdnum = i;
			break;
		}
	}
		
	/* read settings from configuration file */
	el_source(e, NULL);

	/*
	 * Unfortunately, some applications really do use rl_point
	 * and rl_line_buffer directly.
	 */
	li = el_line(e);
	/* a cheesy way to get rid of const cast. */
	rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
	_rl_update_pos();

	if (rl_startup_hook)
		(*rl_startup_hook)(NULL, 0);

	return (0);
}


/*
 * read one line from input stream and return it, chomping
 * trailing newline (if there is any)
 */
char *
readline(const char *prompt)
{
	HistEvent ev;
	int count;
	const char *ret;
	char *buf;
	static int used_event_hook;

	if (e == NULL || h == NULL)
		rl_initialize();

	rl_done = 0;

	/* update prompt accordingly to what has been passed */
	if (!prompt)
		prompt = "";
	if (strcmp(rl_prompt, prompt) != 0) {
		free(rl_prompt);
		rl_prompt = strdup(prompt);
		if (rl_prompt == NULL)
			return NULL;
	}

	if (rl_pre_input_hook)
		(*rl_pre_input_hook)(NULL, 0);

	if (rl_event_hook && !(e->el_flags&NO_TTY)) {
		el_set(e, EL_GETCFN, _rl_event_read_char);
		used_event_hook = 1;
	}

	if (!rl_event_hook && used_event_hook) {
		el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
		used_event_hook = 0;
	}

	rl_already_prompted = 0;

	/* get one line from input stream */
	ret = el_gets(e, &count);

	if (ret && count > 0) {
		int lastidx;

		buf = strdup(ret);
		if (buf == NULL)
			return NULL;
		lastidx = count - 1;
		if (buf[lastidx] == '\n')
			buf[lastidx] = '\0';
	} else
		buf = NULL;

	history(h, &ev, H_GETSIZE);
	history_length = ev.num;

	return buf;
}

/*
 * history functions
 */

/*
 * is normally called before application starts to use
 * history expansion functions
 */
void
using_history(void)
{
	if (h == NULL || e == NULL)
		rl_initialize();
}


/*
 * substitute ``what'' with ``with'', returning resulting string; if
 * globally == 1, substitutes all occurrences of what, otherwise only the
 * first one
 */
static char *
_rl_compat_sub(const char *str, const char *what, const char *with,
    int globally)
{
	const	char	*s;
	char	*r, *result;
	size_t	len, with_len, what_len;

	len = strlen(str);
	with_len = strlen(with);
	what_len = strlen(what);

	/* calculate length we need for result */
	s = str;
	while (*s) {
		if (*s == *what && !strncmp(s, what, what_len)) {
			len += with_len - what_len;
			if (!globally)
				break;
			s += what_len;
		} else
			s++;
	}
	r = result = malloc(len + 1);
	if (result == NULL)
		return NULL;
	s = str;
	while (*s) {
		if (*s == *what && !strncmp(s, what, what_len)) {
			(void)strncpy(r, with, with_len);
			r += with_len;
			s += what_len;
			if (!globally) {
				(void)strcpy(r, s);
				return(result);
			}
		} else
			*r++ = *s++;
	}
	*r = 0;
	return(result);
}

static	char	*last_search_pat;	/* last !?pat[?] search pattern */
static	char	*last_search_match;	/* last !?pat[?] that matched */

const char *
get_history_event(const char *cmd, int *cindex, int qchar)
{
	int idx, sign, sub, num, begin, ret;
	size_t len;
	char	*pat;
	const char *rptr;
	HistEvent ev;

	idx = *cindex;
	if (cmd[idx++] != history_expansion_char)
		return(NULL);

	/* find out which event to take */
	if (cmd[idx] == history_expansion_char || cmd[idx] == 0) {
		if (history(h, &ev, H_FIRST) != 0)
			return(NULL);
		*cindex = cmd[idx]? (idx + 1):idx;
		return(ev.str);
	}
	sign = 0;
	if (cmd[idx] == '-') {
		sign = 1;
		idx++;
	}

	if ('0' <= cmd[idx] && cmd[idx] <= '9') {
		HIST_ENTRY *rl_he;

		num = 0;
		while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
			num = num * 10 + cmd[idx] - '0';
			idx++;
		}
		if (sign)
			num = history_length - num + 1;

		if (!(rl_he = history_get(num)))
			return(NULL);

		*cindex = idx;
		return(rl_he->line);
	}
	sub = 0;
	if (cmd[idx] == '?') {
		sub = 1;
		idx++;
	}
	begin = idx;
	while (cmd[idx]) {
		if (cmd[idx] == '\n')
			break;
		if (sub && cmd[idx] == '?')
			break;
		if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
				    || cmd[idx] == '\t' || cmd[idx] == qchar))
			break;
		idx++;
	}
	len = idx - begin;
	if (sub && cmd[idx] == '?')
		idx++;
	if (sub && len == 0 && last_search_pat && *last_search_pat)
		pat = last_search_pat;
	else if (len == 0)
		return(NULL);
	else {
		if ((pat = malloc(len + 1)) == NULL)
			return NULL;
		(void)strncpy(pat, cmd + begin, len);
		pat[len] = '\0';
	}

	if (history(h, &ev, H_CURR) != 0) {
		if (pat != last_search_pat)
			free(pat);
		return (NULL);
	}
	num = ev.num;

	if (sub) {
		if (pat != last_search_pat) {
			if (last_search_pat)
				free(last_search_pat);
			last_search_pat = pat;
		}
		ret = history_search(pat, -1);
	} else
		ret = history_search_prefix(pat, -1);

	if (ret == -1) {
		/* restore to end of list on failed search */
		history(h, &ev, H_FIRST);
		(void)fprintf(rl_outstream, "%s: Event not found\n", pat);
		if (pat != last_search_pat)
			free(pat);
		return(NULL);
	}

	if (sub && len) {
		if (last_search_match && last_search_match != pat)
			free(last_search_match);
		last_search_match = pat;
	}

	if (pat != last_search_pat)
		free(pat);

	if (history(h, &ev, H_CURR) != 0)
		return(NULL);
	*cindex = idx;
	rptr = ev.str;

	/* roll back to original position */
	(void)history(h, &ev, H_SET, num);

	return rptr;
}

/*
 * the real function doing history expansion - takes as argument command
 * to do and data upon which the command should be executed
 * does expansion the way I've understood readline documentation
 *
 * returns 0 if data was not modified, 1 if it was and 2 if the string
 * should be only printed and not executed; in case of error,
 * returns -1 and *result points to NULL
 * it's callers responsibility to free() string returned in *result
 */
static int
_history_expand_command(const char *command, size_t offs, size_t cmdlen,
    char **result)
{
	char *tmp, *search = NULL, *aptr;
	const char *ptr, *cmd;
	static char *from = NULL, *to = NULL;
	int start, end, idx, has_mods = 0;
	int p_on = 0, g_on = 0;

	*result = NULL;
	aptr = NULL;
	ptr = NULL;

	/* First get event specifier */
	idx = 0;

	if (strchr(":^*$", command[offs + 1])) {
		char str[4];
		/*
		* "!:" is shorthand for "!!:".
		* "!^", "!*" and "!$" are shorthand for
		* "!!:^", "!!:*" and "!!:$" respectively.
		*/
		str[0] = str[1] = '!';
		str[2] = '0';
		ptr = get_history_event(str, &idx, 0);
		idx = (command[offs + 1] == ':')? 1:0;
		has_mods = 1;
	} else {
		if (command[offs + 1] == '#') {
			/* use command so far */
			if ((aptr = malloc(offs + 1)) == NULL)
				return -1;
			(void)strncpy(aptr, command, offs);
			aptr[offs] = '\0';
			idx = 1;
		} else {
			int	qchar;

			qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
			ptr = get_history_event(command + offs, &idx, qchar);
		}
		has_mods = command[offs + idx] == ':';
	}

	if (ptr == NULL && aptr == NULL)
		return(-1);

	if (!has_mods) {
		*result = strdup(aptr? aptr : ptr);
		if (aptr)
			free(aptr);
		return(1);
	}

	cmd = command + offs + idx + 1;

	/* Now parse any word designators */

	if (*cmd == '%')	/* last word matched by ?pat? */
		tmp = strdup(last_search_match? last_search_match:"");
	else if (strchr("^*$-0123456789", *cmd)) {
		start = end = -1;
		if (*cmd == '^')
			start = end = 1, cmd++;
		else if (*cmd == '$')
			start = -1, cmd++;
		else if (*cmd == '*')
			start = 1, cmd++;
	       else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
			start = 0;
			while (*cmd && '0' <= *cmd && *cmd <= '9')
				start = start * 10 + *cmd++ - '0';

			if (*cmd == '-') {
				if (isdigit((unsigned char) cmd[1])) {
					cmd++;
					end = 0;
					while (*cmd && '0' <= *cmd && *cmd <= '9')
						end = end * 10 + *cmd++ - '0';
				} else if (cmd[1] == '$') {
					cmd += 2;
					end = -1;
				} else {
					cmd++;
					end = -2;
				}
			} else if (*cmd == '*')
				end = -1, cmd++;
			else
				end = start;
		}
		tmp = history_arg_extract(start, end, aptr? aptr:ptr);
		if (tmp == NULL) {
			(void)fprintf(rl_outstream, "%s: Bad word specifier",
			    command + offs + idx);
			if (aptr)
				free(aptr);
			return(-1);
		}
	} else
		tmp = strdup(aptr? aptr:ptr);

	if (aptr)
		free(aptr);

	if (*cmd == 0 || (cmd - (command + offs) >= cmdlen)) {
		*result = tmp;
		return(1);
	}

	for (; *cmd; cmd++) {
		if (*cmd == ':')
			continue;
		else if (*cmd == 'h') {		/* remove trailing path */
			if ((aptr = strrchr(tmp, '/')) != NULL)
				*aptr = 0;
		} else if (*cmd == 't') {	/* remove leading path */
			if ((aptr = strrchr(tmp, '/')) != NULL) {
				aptr = strdup(aptr + 1);
				free(tmp);
				tmp = aptr;
			}
		} else if (*cmd == 'r') {	/* remove trailing suffix */
			if ((aptr = strrchr(tmp, '.')) != NULL)
				*aptr = 0;
		} else if (*cmd == 'e') {	/* remove all but suffix */
			if ((aptr = strrchr(tmp, '.')) != NULL) {
				aptr = strdup(aptr);
				free(tmp);
				tmp = aptr;
			}
		} else if (*cmd == 'p')		/* print only */
			p_on = 1;
		else if (*cmd == 'g')
			g_on = 2;
		else if (*cmd == 's' || *cmd == '&') {
			char *what, *with, delim;