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NetBSD/lib/libedit/readline.c

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/* $NetBSD: readline.c,v 1.22 2002/04/09 01:57:34 thorpej 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.
*/
#include "config.h"
#if !defined(lint) && !defined(SCCSID)
__RCSID("$NetBSD: readline.c,v 1.22 2002/04/09 01:57:34 thorpej Exp $");
#endif /* not lint && not SCCSID */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <pwd.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include "histedit.h"
#include "readline/readline.h"
#include "el.h"
#include "fcns.h" /* for EL_NUM_FCNS */
/* for rl_complete() */
#define TAB '\r'
/* see comment at the #ifdef for sense of this */
#define GDB_411_HACK
/* readline compatibility stuff - look at readline sources/documentation */
/* to see what these variables mean */
const char *rl_library_version = "EditLine wrapper";
static char empty[] = { '\0' };
static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
'>', '<', '=', ';', '|', '&', '{', '(', '\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;
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;
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;
CPFunction *rl_completion_entry_function = NULL;
CPPFunction *rl_attempted_completion_function = 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 int el_rl_complete_cmdnum = 0;
/* internal functions */
static unsigned char _el_rl_complete(EditLine *, int);
static char *_get_prompt(EditLine *);
static HIST_ENTRY *_move_history(int);
static int _history_search_gen(const char *, int, int);
static int _history_expand_command(const char *, 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 *);
/*
* needed for prompt switching in readline()
*/
static char *el_rl_prompt = NULL;
/* ARGSUSED */
static char *
_get_prompt(EditLine *el)
{
return (el_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 = "";
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() */
el_rl_prompt = strdup("");
el_set(e, EL_PROMPT, _get_prompt);
el_set(e, EL_SIGNAL, 1);
/* set default mode to "emacs"-style and read setting afterwards */
/* so this can be overriden */
el_set(e, EL_EDITOR, "emacs");
/*
* Word completition - this has to go AFTER rebinding keys
* to emacs-style.
*/
el_set(e, EL_ADDFN, "rl_complete",
"ReadLine compatible completition function",
_el_rl_complete);
el_set(e, EL_BIND, "^I", "rl_complete", 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_point = rl_end = 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;
if (e == NULL || h == NULL)
rl_initialize();
/* update prompt accordingly to what has been passed */
if (!prompt)
prompt = "";
if (strcmp(el_rl_prompt, prompt) != 0) {
free(el_rl_prompt);
el_rl_prompt = strdup(prompt);
}
/* get one line from input stream */
ret = el_gets(e, &count);
if (ret && count > 0) {
int lastidx;
buf = strdup(ret);
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 occurences of what, otherwise only the
* first one
*/
static char *
_rl_compat_sub(const char *str, const char *what, const char *with,
int globally)
{
char *result;
const char *temp, *new;
int len, with_len, what_len, add;
size_t size, i;
result = malloc((size = 16));
temp = str;
with_len = strlen(with);
what_len = strlen(what);
len = 0;
do {
new = strstr(temp, what);
if (new) {
i = new - temp;
add = i + with_len;
if (i + add + 1 >= size) {
size += add + 1;
result = realloc(result, size);
}
(void) strncpy(&result[len], temp, i);
len += i;
(void) strcpy(&result[len], with); /* safe */
len += with_len;
temp = new + what_len;
} else {
add = strlen(temp);
if (len + add + 1 >= size) {
size += add + 1;
result = realloc(result, size);
}
(void) strcpy(&result[len], temp); /* safe */
len += add;
temp = NULL;
}
} while (temp && globally);
result[len] = '\0';
return (result);
}
/*
* 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
* word designator ``%'' isn't supported (yet ?)
*
* 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 cmdlen, char **result)
{
char **arr, *tempcmd, *line, *search = NULL, *cmd;
const char *event_data = NULL;
static char *from = NULL, *to = NULL;
int start = -1, end = -1, max, i, idx;
int h_on = 0, t_on = 0, r_on = 0, e_on = 0, p_on = 0, g_on = 0;
int event_num = 0, retval;
size_t cmdsize;
*result = NULL;
cmd = alloca(cmdlen + 1);
(void) strncpy(cmd, command, cmdlen);
cmd[cmdlen] = 0;
idx = 1;
/* find out which event to take */
if (cmd[idx] == history_expansion_char) {
event_num = history_length;
idx++;
} else {
int off, num;
size_t len;
off = idx;
while (cmd[off] && !strchr(":^$*-%", cmd[off]))
off++;
num = atoi(&cmd[idx]);
if (num != 0) {
event_num = num;
if (num < 0)
event_num += history_length + 1;
} else {
int prefix = 1, curr_num;
HistEvent ev;
len = off - idx;
if (cmd[idx] == '?') {
idx++, len--;
if (cmd[off - 1] == '?')
len--;
else if (cmd[off] != '\n' && cmd[off] != '\0')
return (-1);
prefix = 0;
}
search = alloca(len + 1);
(void) strncpy(search, &cmd[idx], len);
search[len] = '\0';
if (history(h, &ev, H_CURR) != 0)
return (-1);
curr_num = ev.num;
if (prefix)
retval = history_search_prefix(search, -1);
else
retval = history_search(search, -1);
if (retval == -1) {
fprintf(rl_outstream, "%s: Event not found\n",
search);
return (-1);
}
if (history(h, &ev, H_CURR) != 0)
return (-1);
event_data = ev.str;
/* roll back to original position */
history(h, &ev, H_NEXT_EVENT, curr_num);
}
idx = off;
}
if (!event_data && event_num >= 0) {
HIST_ENTRY *rl_he;
rl_he = history_get(event_num);
if (!rl_he)
return (0);
event_data = rl_he->line;
} else
return (-1);
if (cmd[idx] != ':')
return (-1);
cmd += idx + 1;
/* recognize cmd */
if (*cmd == '^')
start = end = 1, cmd++;
else if (*cmd == '$')
start = end = -1, cmd++;
else if (*cmd == '*')
start = 1, end = -1, cmd++;
else if (isdigit((unsigned char) *cmd)) {
const char *temp;
int shifted = 0;
start = atoi(cmd);
temp = cmd;
for (; isdigit((unsigned char) *cmd); cmd++);
if (temp != cmd)
shifted = 1;
if (shifted && *cmd == '-') {
if (!isdigit((unsigned char) *(cmd + 1)))
end = -2;
else {
end = atoi(cmd + 1);
for (; isdigit((unsigned char) *cmd); cmd++);
}
} else if (shifted && *cmd == '*')
end = -1, cmd++;
else if (shifted)
end = start;
}
if (*cmd == ':')
cmd++;
line = strdup(event_data);
for (; *cmd; cmd++) {
if (*cmd == ':')
continue;
else if (*cmd == 'h')
h_on = 1 | g_on, g_on = 0;
else if (*cmd == 't')
t_on = 1 | g_on, g_on = 0;
else if (*cmd == 'r')
r_on = 1 | g_on, g_on = 0;
else if (*cmd == 'e')
e_on = 1 | g_on, g_on = 0;
else if (*cmd == 'p')
p_on = 1 | g_on, g_on = 0;
else if (*cmd == 'g')
g_on = 2;
else if (*cmd == 's' || *cmd == '&') {
char *what, *with, delim;
int len, from_len;
size_t size;
if (*cmd == '&' && (from == NULL || to == NULL))
continue;
else if (*cmd == 's') {
delim = *(++cmd), cmd++;
size = 16;
what = realloc(from, size);
len = 0;
for (; *cmd && *cmd != delim; cmd++) {
if (*cmd == '\\'
&& *(cmd + 1) == delim)
cmd++;
if (len >= size)
what = realloc(what,
(size <<= 1));
what[len++] = *cmd;
}
what[len] = '\0';
from = what;
if (*what == '\0') {
free(what);
if (search)
from = strdup(search);
else {
from = NULL;
return (-1);
}
}
cmd++; /* shift after delim */
if (!*cmd)
continue;
size = 16;
with = realloc(to, size);
len = 0;
from_len = strlen(from);
for (; *cmd && *cmd != delim; cmd++) {
if (len + from_len + 1 >= size) {
size += from_len + 1;
with = realloc(with, size);
}
if (*cmd == '&') {
/* safe */
(void) strcpy(&with[len], from);
len += from_len;
continue;
}
if (*cmd == '\\'
&& (*(cmd + 1) == delim
|| *(cmd + 1) == '&'))
cmd++;
with[len++] = *cmd;
}
with[len] = '\0';
to = with;
tempcmd = _rl_compat_sub(line, from, to,
(g_on) ? 1 : 0);
free(line);
line = tempcmd;
g_on = 0;
}
}
}
arr = history_tokenize(line);
free(line); /* no more needed */
if (arr && *arr == NULL)
free(arr), arr = NULL;
if (!arr)
return (-1);
/* find out max valid idx to array of array */
max = 0;
for (i = 0; arr[i]; i++)
max++;
max--;
/* set boundaries to something relevant */
if (start < 0)
start = 1;
if (end < 0)
end = max - ((end < -1) ? 1 : 0);
/* check boundaries ... */
if (start > max || end > max || start > end)
return (-1);
for (i = 0; i <= max; i++) {
char *temp;
if (h_on && (i == 1 || h_on > 1) &&
(temp = strrchr(arr[i], '/')))
*(temp + 1) = '\0';
if (t_on && (i == 1 || t_on > 1) &&
(temp = strrchr(arr[i], '/')))
(void) strcpy(arr[i], temp + 1);
if (r_on && (i == 1 || r_on > 1) &&
(temp = strrchr(arr[i], '.')))
*temp = '\0';
if (e_on && (i == 1 || e_on > 1) &&
(temp = strrchr(arr[i], '.')))
(void) strcpy(arr[i], temp);
}
cmdsize = 1, cmdlen = 0;
tempcmd = malloc(cmdsize);
for (i = start; start <= i && i <= end; i++) {
int arr_len;
arr_len = strlen(arr[i]);
if (cmdlen + arr_len + 1 >= cmdsize) {
cmdsize += arr_len + 1;
tempcmd = realloc(tempcmd, cmdsize);
}
(void) strcpy(&tempcmd[cmdlen], arr[i]); /* safe */
cmdlen += arr_len;
tempcmd[cmdlen++] = ' '; /* add a space */
}
while (cmdlen > 0 && isspace((unsigned char) tempcmd[cmdlen - 1]))
cmdlen--;
tempcmd[cmdlen] = '\0';
*result = tempcmd;
for (i = 0; i <= max; i++)
free(arr[i]);
free(arr), arr = (char **) NULL;
return (p_on) ? 2 : 1;
}
/*
* csh-style history expansion
*/
int
history_expand(char *str, char **output)
{
int i, retval = 0, idx;
size_t size;
char *temp, *result;
if (h == NULL || e == NULL)
rl_initialize();
*output = strdup(str); /* do it early */
if (str[0] == history_subst_char) {
/* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
temp = alloca(4 + strlen(str) + 1);
temp[0] = temp[1] = history_expansion_char;
temp[2] = ':';
temp[3] = 's';
(void) strcpy(temp + 4, str);
str = temp;
}
#define ADD_STRING(what, len) \
{ \
if (idx + len + 1 > size) \
result = realloc(result, (size += len + 1)); \
(void)strncpy(&result[idx], what, len); \
idx += len; \
result[idx] = '\0'; \
}
result = NULL;
size = idx = 0;
for (i = 0; str[i];) {
int start, j, loop_again;
size_t len;
loop_again = 1;
start = j = i;
loop:
for (; str[j]; j++) {
if (str[j] == '\\' &&
str[j + 1] == history_expansion_char) {
(void) strcpy(&str[j], &str[j + 1]);
continue;
}
if (!loop_again) {
if (str[j] == '?') {
while (str[j] && str[++j] != '?');
if (str[j] == '?')
j++;
} else if (isspace((unsigned char) str[j]))
break;
}
if (str[j] == history_expansion_char
&& !strchr(history_no_expand_chars, str[j + 1])
&& (!history_inhibit_expansion_function ||
(*history_inhibit_expansion_function)(str, j) == 0))
break;
}
if (str[j] && str[j + 1] != '#' && loop_again) {
i = j;
j++;
if (str[j] == history_expansion_char)
j++;
loop_again = 0;
goto loop;
}
len = i - start;
temp = &str[start];
ADD_STRING(temp, len);
if (str[i] == '\0' || str[i] != history_expansion_char
|| str[i + 1] == '#') {
len = j - i;
temp = &str[i];
ADD_STRING(temp, len);
if (start == 0)
retval = 0;
else
retval = 1;
break;
}
retval = _history_expand_command(&str[i], (size_t) (j - i),
&temp);
if (retval != -1) {
len = strlen(temp);
ADD_STRING(temp, len);
}
i = j;
} /* for(i ...) */
if (retval == 2) {
add_history(temp);
#ifdef GDB_411_HACK
/* gdb 4.11 has been shipped with readline, where */
/* history_expand() returned -1 when the line */
/* should not be executed; in readline 2.1+ */
/* it should return 2 in such a case */
retval = -1;
#endif
}
free(*output);
*output = result;
return (retval);
}
/*
* Parse the string into individual tokens, similarily to how shell would do it.
*/
char **
history_tokenize(const char *str)
{
int size = 1, result_idx = 0, i, start;
size_t len;
char **result = NULL, *temp, delim = '\0';
for (i = 0; str[i]; i++) {
while (isspace((unsigned char) str[i]))
i++;
start = i;
for (; str[i]; i++) {
if (str[i] == '\\') {
if (str[i+1] != '\0')
i++;
} else if (str[i] == delim)
delim = '\0';
else if (!delim &&
(isspace((unsigned char) str[i]) ||
strchr("()<>;&|$", str[i])))
break;
else if (!delim && strchr("'`\"", str[i]))
delim = str[i];
}
if (result_idx + 2 >= size) {
size <<= 1;
result = realloc(result, size * sizeof(char *));
}
len = i - start;
temp = malloc(len + 1);
(void) strncpy(temp, &str[start], len);
temp[len] = '\0';
result[result_idx++] = temp;
result[result_idx] = NULL;
}
return (result);
}
/*
* limit size of history record to ``max'' events
*/
void
stifle_history(int max)
{
HistEvent ev;
if (h == NULL || e == NULL)
rl_initialize();
if (history(h, &ev, H_SETSIZE, max) == 0)
max_input_history = max;
}
/*
* "unlimit" size of history - set the limit to maximum allowed int value
*/
int
unstifle_history(void)
{
HistEvent ev;
int omax;
history(h, &ev, H_SETSIZE, INT_MAX);
omax = max_input_history;
max_input_history = INT_MAX;
return (omax); /* some value _must_ be returned */
}
int
history_is_stifled(void)
{
/* cannot return true answer */
return (max_input_history != INT_MAX);
}
/*
* read history from a file given
*/
int
read_history(const char *filename)
{
HistEvent ev;
if (h == NULL || e == NULL)
rl_initialize();
return (history(h, &ev, H_LOAD, filename));
}
/*
* write history to a file given
*/
int
write_history(const char *filename)
{
HistEvent ev;
if (h == NULL || e == NULL)
rl_initialize();
return (history(h, &ev, H_SAVE, filename));
}
/*
* returns history ``num''th event
*
* returned pointer points to static variable
*/
HIST_ENTRY *
history_get(int num)
{
static HIST_ENTRY she;
HistEvent ev;
int i = 1, curr_num;
if (h == NULL || e == NULL)
rl_initialize();
/* rewind to beginning */
if (history(h, &ev, H_CURR) != 0)
return (NULL);
curr_num = ev.num;
if (history(h, &ev, H_LAST) != 0)
return (NULL); /* error */
while (i < num && history(h, &ev, H_PREV) == 0)
i++;
if (i != num)
return (NULL); /* not so many entries */
she.line = ev.str;
she.data = NULL;
/* rewind history to the same event it was before */
(void) history(h, &ev, H_FIRST);
(void) history(h, &ev, H_NEXT_EVENT, curr_num);
return (&she);
}
/*
* add the line to history table
*/
int
add_history(const char *line)
{
HistEvent ev;
if (h == NULL || e == NULL)
rl_initialize();
(void) history(h, &ev, H_ENTER, line);
if (history(h, &ev, H_GETSIZE) == 0)
history_length = ev.num;
return (!(history_length > 0)); /* return 0 if all is okay */
}
/*
* clear the history list - delete all entries
*/
void
clear_history(void)
{
HistEvent ev;
history(h, &ev, H_CLEAR);
}
/*
* returns offset of the current history event
*/
int
where_history(void)
{
HistEvent ev;
int curr_num, off;
if (history(h, &ev, H_CURR) != 0)
return (0);
curr_num = ev.num;
history(h, &ev, H_FIRST);
off = 1;
while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
off++;
return (off);
}
/*
* returns current history event or NULL if there is no such event
*/
HIST_ENTRY *
current_history(void)
{
return (_move_history(H_CURR));
}
/*
* returns total number of bytes history events' data are using
*/
int
history_total_bytes(void)
{
HistEvent ev;
int curr_num, size;
if (history(h, &ev, H_CURR) != 0)
return (-1);
curr_num = ev.num;
history(h, &ev, H_FIRST);
size = 0;
do
size += strlen(ev.str);
while (history(h, &ev, H_NEXT) == 0);
/* get to the same position as before */
history(h, &ev, H_PREV_EVENT, curr_num);
return (size);
}
/*
* sets the position in the history list to ``pos''
*/
int
history_set_pos(int pos)
{
HistEvent ev;
int off, curr_num;
if (pos > history_length || pos < 0)
return (-1);
history(h, &ev, H_CURR);
curr_num = ev.num;
history(h, &ev, H_FIRST);
off = 0;
while (off < pos && history(h, &ev, H_NEXT) == 0)
off++;
if (off != pos) { /* do a rollback in case of error */
history(h, &ev, H_FIRST);
history(h, &ev, H_NEXT_EVENT, curr_num);
return (-1);
}
return (0);
}
/*
* returns previous event in history and shifts pointer accordingly
*/
HIST_ENTRY *
previous_history(void)
{
return (_move_history(H_PREV));
}
/*
* returns next event in history and shifts pointer accordingly
*/
HIST_ENTRY *
next_history(void)
{
return (_move_history(H_NEXT));
}
/*
* generic history search function
*/
static int
_history_search_gen(const char *str, int direction, int pos)
{
HistEvent ev;
const char *strp;
int curr_num;
if (history(h, &ev, H_CURR) != 0)
return (-1);
curr_num = ev.num;
for (;;) {
strp = strstr(ev.str, str);
if (strp && (pos < 0 || &ev.str[pos] == strp))
return (int) (strp - ev.str);
if (history(h, &ev, direction < 0 ? H_PREV : H_NEXT) != 0)
break;
}
history(h, &ev, direction < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
return (-1);
}
/*
* searches for first history event containing the str
*/
int
history_search(const char *str, int direction)
{
return (_history_search_gen(str, direction, -1));
}
/*
* searches for first history event beginning with str
*/
int
history_search_prefix(const char *str, int direction)
{
return (_history_search_gen(str, direction, 0));
}
/*
* search for event in history containing str, starting at offset
* abs(pos); continue backward, if pos<0, forward otherwise
*/
/* ARGSUSED */
int
history_search_pos(const char *str, int direction, int pos)
{
HistEvent ev;
int curr_num, off;
off = (pos > 0) ? pos : -pos;
pos = (pos > 0) ? 1 : -1;
if (history(h, &ev, H_CURR) != 0)
return (-1);
curr_num = ev.num;
if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
return (-1);
for (;;) {
if (strstr(ev.str, str))
return (off);
if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
break;
}
/* set "current" pointer back to previous state */
history(h, &ev, (pos < 0) ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
return (-1);
}
/********************************/
/* completition functions */
/*
* does tilde expansion of strings of type ``~user/foo''
* if ``user'' isn't valid user name or ``txt'' doesn't start
* w/ '~', returns pointer to strdup()ed copy of ``txt''
*
* it's callers's responsibility to free() returned string
*/
char *
tilde_expand(char *txt)
{
struct passwd *pass;
char *temp;
size_t len = 0;
if (txt[0] != '~')
return (strdup(txt));
temp = strchr(txt + 1, '/');
if (temp == NULL)
temp = strdup(txt + 1);
else {
len = temp - txt + 1; /* text until string after slash */
temp = malloc(len);
(void) strncpy(temp, txt + 1, len - 2);
temp[len - 2] = '\0';
}
pass = getpwnam(temp);
free(temp); /* value no more needed */
if (pass == NULL)
return (strdup(txt));
/* update pointer txt to point at string immedially following */
/* first slash */
txt += len;
temp = malloc(strlen(pass->pw_dir) + 1 + strlen(txt) + 1);
(void) sprintf(temp, "%s/%s", pass->pw_dir, txt);
return (temp);
}
/*
* return first found file name starting by the ``text'' or NULL if no
* such file can be found
* value of ``state'' is ignored
*
* it's caller's responsibility to free returned string
*/
char *
filename_completion_function(const char *text, int state)
{
static DIR *dir = NULL;
static char *filename = NULL, *dirname = NULL;
static size_t filename_len = 0;
struct dirent *entry;
char *temp;
size_t len;
if (state == 0 || dir == NULL) {
if (dir != NULL) {
closedir(dir);
dir = NULL;
}
temp = strrchr(text, '/');
if (temp) {
temp++;
filename = realloc(filename, strlen(temp) + 1);
(void) strcpy(filename, temp);
len = temp - text; /* including last slash */
dirname = realloc(dirname, len + 1);
(void) strncpy(dirname, text, len);
dirname[len] = '\0';
} else {
filename = strdup(text);
dirname = NULL;
}
/* support for ``~user'' syntax */
if (dirname && *dirname == '~') {
temp = tilde_expand(dirname);
dirname = realloc(dirname, strlen(temp) + 1);
(void) strcpy(dirname, temp); /* safe */
free(temp); /* no longer needed */
}
/* will be used in cycle */
filename_len = strlen(filename);
if (filename_len == 0)
return (NULL); /* no expansion possible */
dir = opendir(dirname ? dirname : ".");
if (!dir)
return (NULL); /* cannot open the directory */
}
/* find the match */
while ((entry = readdir(dir)) != NULL) {
/* otherwise, get first entry where first */
/* filename_len characters are equal */
if (entry->d_name[0] == filename[0]
#if defined(__SVR4) || defined(__linux__)
&& strlen(entry->d_name) >= filename_len
#else
&& entry->d_namlen >= filename_len
#endif
&& strncmp(entry->d_name, filename,
filename_len) == 0)
break;
}
if (entry) { /* match found */
struct stat stbuf;
#if defined(__SVR4) || defined(__linux__)
len = strlen(entry->d_name) +
#else
len = entry->d_namlen +
#endif
((dirname) ? strlen(dirname) : 0) + 1 + 1;
temp = malloc(len);
(void) sprintf(temp, "%s%s",
dirname ? dirname : "", entry->d_name); /* safe */
/* test, if it's directory */
if (stat(temp, &stbuf) == 0 && S_ISDIR(stbuf.st_mode))
strcat(temp, "/"); /* safe */
} else
temp = NULL;
return (temp);
}
/*
* a completion generator for usernames; returns _first_ username
* which starts with supplied text
* text contains a partial username preceded by random character
* (usually '~'); state is ignored
* it's callers responsibility to free returned value
*/
char *
username_completion_function(const char *text, int state)
{
struct passwd *pwd;
if (text[0] == '\0')
return (NULL);
if (*text == '~')
text++;
if (state == 0)
setpwent();
while ((pwd = getpwent()) && text[0] == pwd->pw_name[0]
&& strcmp(text, pwd->pw_name) == 0);
if (pwd == NULL) {
endpwent();
return (NULL);
}
return (strdup(pwd->pw_name));
}
/*
* el-compatible wrapper around rl_complete; needed for key binding
*/
/* ARGSUSED */
static unsigned char
_el_rl_complete(EditLine *el, int ch)
{
return (unsigned char) rl_complete(0, ch);
}
/*
* returns list of completitions for text given
*/
char **
completion_matches(const char *text, CPFunction *genfunc)
{
char **match_list = NULL, *retstr, *prevstr;
size_t match_list_len, max_equal, which, i;
int matches;
if (h == NULL || e == NULL)
rl_initialize();
matches = 0;
match_list_len = 1;
while ((retstr = (*genfunc) (text, matches)) != NULL) {
if (matches + 1 >= match_list_len) {
match_list_len <<= 1;
match_list = realloc(match_list,
match_list_len * sizeof(char *));
}
match_list[++matches] = retstr;
}
if (!match_list)
return (char **) NULL; /* nothing found */
/* find least denominator and insert it to match_list[0] */
which = 2;
prevstr = match_list[1];
max_equal = strlen(prevstr);
for (; which <= matches; which++) {
for (i = 0; i < max_equal &&
prevstr[i] == match_list[which][i]; i++)
continue;
max_equal = i;
}
retstr = malloc(max_equal + 1);
(void) strncpy(retstr, match_list[1], max_equal);
retstr[max_equal] = '\0';
match_list[0] = retstr;
/* add NULL as last pointer to the array */
if (matches + 1 >= match_list_len)
match_list = realloc(match_list,
(match_list_len + 1) * sizeof(char *));
match_list[matches + 1] = (char *) NULL;
return (match_list);
}
/*
* Sort function for qsort(). Just wrapper around strcasecmp().
*/
static int
_rl_qsort_string_compare(i1, i2)
const void *i1, *i2;
{
const char *s1 = ((const char * const *)i1)[0];
const char *s2 = ((const char * const *)i2)[0];
return strcasecmp(s1, s2);
}
/*
* Display list of strings in columnar format on readline's output stream.
* 'matches' is list of strings, 'len' is number of strings in 'matches',
* 'max' is maximum length of string in 'matches'.
*/
void
rl_display_match_list (matches, len, max)
char **matches;
int len, max;
{
int i, idx, limit, count;
int screenwidth = e->el_term.t_size.h;
/*
* Find out how many entries can be put on one line, count
* with two spaces between strings.
*/
limit = screenwidth / (max + 2);
if (limit == 0)
limit = 1;
/* how many lines of output */
count = len / limit;
if (count * limit < len)
count++;
/* Sort the items if they are not already sorted. */
qsort(&matches[1], (size_t)(len - 1), sizeof(char *),
_rl_qsort_string_compare);
idx = 1;
for(; count > 0; count--) {
for(i=0; i < limit && matches[idx]; i++, idx++)
fprintf(e->el_outfile, "%-*s ", max, matches[idx]);
fprintf(e->el_outfile, "\n");
}
}
/*
* Complete the word at or before point, called by rl_complete()
* 'what_to_do' says what to do with the completion.
* `?' means list the possible completions.
* TAB means do standard completion.
* `*' means insert all of the possible completions.
* `!' means to do standard completion, and list all possible completions if
* there is more than one.
*
* Note: '*' support is not implemented
*/
static int
rl_complete_internal(int what_to_do)
{
CPFunction *complet_func;
const LineInfo *li;
char *temp, **matches;
const char *ctemp;
size_t len;
rl_completion_type = what_to_do;
if (h == NULL || e == NULL)
rl_initialize();
complet_func = rl_completion_entry_function;
if (!complet_func)
complet_func = filename_completion_function;
/* We now look backwards for the start of a filename/variable word */
li = el_line(e);
ctemp = (const char *) li->cursor;
while (ctemp > li->buffer
&& !strchr(rl_basic_word_break_characters, ctemp[-1])
&& (!rl_special_prefixes
|| !strchr(rl_special_prefixes, ctemp[-1]) ) )
ctemp--;
len = li->cursor - ctemp;
temp = alloca(len + 1);
(void) strncpy(temp, ctemp, len);
temp[len] = '\0';
/* these can be used by function called in completion_matches() */
/* or (*rl_attempted_completion_function)() */
rl_point = li->cursor - li->buffer;
rl_end = li->lastchar - li->buffer;
if (!rl_attempted_completion_function)
matches = completion_matches(temp, complet_func);
else {
int end = li->cursor - li->buffer;
matches = (*rl_attempted_completion_function) (temp, (int)
(end - len), end);
}
if (matches) {
int i, retval = CC_REFRESH;
int matches_num, maxlen, match_len, match_display=1;
/*
* Only replace the completed string with common part of
* possible matches if there is possible completion.
*/
if (matches[0][0] != '\0') {
el_deletestr(e, (int) len);
el_insertstr(e, matches[0]);
}
if (what_to_do == '?')
goto display_matches;
if (matches[2] == NULL && strcmp(matches[0], matches[1]) == 0) {
/*
* We found exact match. Add a space after
* it, unless we do filename completition and the
* object is a directory.
*/
size_t alen = strlen(matches[0]);
if ((complet_func != filename_completion_function
|| (alen > 0 && (matches[0])[alen - 1] != '/'))
&& rl_completion_append_character) {
char buf[2];
buf[0] = rl_completion_append_character;
buf[1] = '\0';
el_insertstr(e, buf);
}
} else if (what_to_do == '!') {
display_matches:
/*
* More than one match and requested to list possible
* matches.
*/
for(i=1, maxlen=0; matches[i]; i++) {
match_len = strlen(matches[i]);
if (match_len > maxlen)
maxlen = match_len;
}
matches_num = i - 1;
/* newline to get on next line from command line */
fprintf(e->el_outfile, "\n");
/*
* If there are too many items, ask user for display
* confirmation.
*/
if (matches_num > rl_completion_query_items) {
fprintf(e->el_outfile,
"Display all %d possibilities? (y or n) ",
matches_num);
fflush(e->el_outfile);
if (getc(stdin) != 'y')
match_display = 0;
fprintf(e->el_outfile, "\n");
}
if (match_display)
rl_display_match_list(matches, matches_num,
maxlen);
retval = CC_REDISPLAY;
} else if (matches[0][0]) {
/*
* There was some common match, but the name was
* not complete enough. Next tab will print possible
* completions.
*/
el_beep(e);
} else {
/* lcd is not a valid object - further specification */
/* is needed */
el_beep(e);
retval = CC_NORM;
}
/* free elements of array and the array itself */
for (i = 0; matches[i]; i++)
free(matches[i]);
free(matches), matches = NULL;
return (retval);
}
return (CC_NORM);
}
/*
* complete word at current point
*/
int
rl_complete(int ignore, int invoking_key)
{
if (h == NULL || e == NULL)
rl_initialize();
if (rl_inhibit_completion) {
rl_insert(ignore, invoking_key);
return (CC_REFRESH);
} else if (e->el_state.lastcmd == el_rl_complete_cmdnum)
return rl_complete_internal('?');
else if (_rl_complete_show_all)
return rl_complete_internal('!');
else
return (rl_complete_internal(TAB));
}
/*
* misc other functions
*/
/*
* bind key c to readline-type function func
*/
int
rl_bind_key(int c, int func(int, int))
{
int retval = -1;
if (h == NULL || e == NULL)
rl_initialize();
if (func == rl_insert) {
/* XXX notice there is no range checking of ``c'' */
e->el_map.key[c] = ED_INSERT;
retval = 0;
}
return (retval);
}
/*
* read one key from input - handles chars pushed back
* to input stream also
*/
int
rl_read_key(void)
{
char fooarr[2 * sizeof(int)];
if (e == NULL || h == NULL)
rl_initialize();
return (el_getc(e, fooarr));
}
/*
* reset the terminal
*/
/* ARGSUSED */
void
rl_reset_terminal(const char *p)
{
if (h == NULL || e == NULL)
rl_initialize();
el_reset(e);
}
/*
* insert character ``c'' back into input stream, ``count'' times
*/
int
rl_insert(int count, int c)
{
char arr[2];
if (h == NULL || e == NULL)
rl_initialize();
/* XXX - int -> char conversion can lose on multichars */
arr[0] = c;
arr[1] = '\0';
for (; count > 0; count--)
el_push(e, arr);
return (0);
}
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