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freebsd-skq/readline.c
David E. O'Brien 307eee7ed0 Vendor import NetBSD's libedit of "2006/03/23 20:22:51 UTC". 
Obtained from:	NetBSD
2011-03-31 18:28:46 +00:00

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/* $NetBSD: readline.c,v 1.66 2006/03/21 17:52:50 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.
*/
#include "config.h"
#if !defined(lint) && !defined(SCCSID)
__RCSID("$NetBSD: readline.c,v 1.66 2006/03/21 17:52:50 christos Exp $");
#endif /* not lint && not SCCSID */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <pwd.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_VIS_H
#include <vis.h>
#else
#include "np/vis.h"
#endif
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#include "el.h"
#include "fcns.h" /* for EL_NUM_FCNS */
#include "histedit.h"
#include "readline/readline.h"
#include "filecomplete.h"
/* for rl_complete() */
#define TAB '\r'
/* see comment at the #ifdef for sense of this */
/* #define GDB_411_HACK */
/* readline compatibility stuff - look at readline sources/documentation */
/* to see what these variables mean */
const char *rl_library_version = "EditLine wrapper";
static char empty[] = { '\0' };
static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
'>', '<', '=', ';', '|', '&', '{', '(', '\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;
VCPFunction *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 = 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 */
static History *h = NULL;
static EditLine *e = NULL;
static Function *map[256];
/* internal functions */
static unsigned char _el_rl_complete(EditLine *, int);
static unsigned char _el_rl_tstp(EditLine *, int);
static char *_get_prompt(EditLine *);
static int _getc_function(EditLine *, char *);
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_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 = NULL;
return (&rl_he);
}
/*
* read one key from user defined input function
*/
static int
/*ARGSUSED*/
_getc_function(EditLine *el, char *c)
{
int i;
i = (*rl_getc_function)(NULL, 0);
if (i == -1)
return 0;
*c = i;
return 1;
}
/*
* READLINE compatibility stuff
*/
/*
* initialize rl compat stuff
*/
int
rl_initialize(void)
{
HistEvent ev;
const LineInfo *li;
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);
/* setup getc function if valid */
if (rl_getc_function)
el_set(e, EL_GETCFN, _getc_function);
/* 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);
/* 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;
size_t 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);
if (what == NULL) {
free(from);
free(tmp);
return 0;
}
len = 0;
for (; *cmd && *cmd != delim; cmd++) {
if (*cmd == '\\' && cmd[1] == delim)
cmd++;
if (len >= size) {
char *nwhat;
nwhat = realloc(what,
(size <<= 1));
if (nwhat == NULL) {
free(what);
free(tmp);
return 0;
}
what = nwhat;
}
what[len++] = *cmd;
}
what[len] = '\0';
from = what;
if (*what == '\0') {
free(what);
if (search) {
from = strdup(search);
if (from == NULL) {
free(tmp);
return 0;
}
} else {
from = NULL;
free(tmp);
return (-1);
}
}
cmd++; /* shift after delim */
if (!*cmd)
continue;
size = 16;
with = realloc(to, size);
if (with == NULL) {
free(to);
free(tmp);
return -1;
}
len = 0;
from_len = strlen(from);
for (; *cmd && *cmd != delim; cmd++) {
if (len + from_len + 1 >= size) {
char *nwith;
size += from_len + 1;
nwith = realloc(with, size);
if (nwith == NULL) {
free(with);
free(tmp);
return -1;
}
with = nwith;
}
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;
}
aptr = _rl_compat_sub(tmp, from, to, g_on);
if (aptr) {
free(tmp);
tmp = aptr;
}
g_on = 0;
}
}
*result = tmp;
return (p_on? 2:1);
}
/*
* csh-style history expansion
*/
int
history_expand(char *str, char **output)
{
int ret = 0;
size_t idx, i, size;
char *tmp, *result;
if (h == NULL || e == NULL)
rl_initialize();
if (history_expansion_char == 0) {
*output = strdup(str);
return(0);
}
*output = NULL;
if (str[0] == history_subst_char) {
/* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
*output = malloc(strlen(str) + 4 + 1);
if (*output == NULL)
return 0;
(*output)[0] = (*output)[1] = history_expansion_char;
(*output)[2] = ':';
(*output)[3] = 's';
(void)strcpy((*output) + 4, str);
str = *output;
} else {
*output = strdup(str);
if (*output == NULL)
return 0;
}
#define ADD_STRING(what, len, fr) \
{ \
if (idx + len + 1 > size) { \
char *nresult = realloc(result, (size += len + 1));\
if (nresult == NULL) { \
free(*output); \
if (/*CONSTCOND*/fr) \
free(tmp); \
return 0; \
} \
result = nresult; \
} \
(void)strncpy(&result[idx], what, len); \
idx += len; \
result[idx] = '\0'; \
}
result = NULL;
size = idx = 0;
tmp = NULL;
for (i = 0; str[i];) {
int qchar, loop_again;
size_t len, start, j;
qchar = 0;
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 (isspace((unsigned char) str[j])
|| str[j] == qchar)
break;
}
if (str[j] == history_expansion_char
&& !strchr(history_no_expand_chars, str[j + 1])
&& (!history_inhibit_expansion_function ||
(*history_inhibit_expansion_function)(str,
(int)j) == 0))
break;
}
if (str[j] && loop_again) {
i = j;
qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
j++;
if (str[j] == history_expansion_char)
j++;
loop_again = 0;
goto loop;
}
len = i - start;
ADD_STRING(&str[start], len, 0);
if (str[i] == '\0' || str[i] != history_expansion_char) {
len = j - i;
ADD_STRING(&str[i], len, 0);
if (start == 0)
ret = 0;
else
ret = 1;
break;
}
if (tmp) {
free(tmp);
tmp = NULL;
}
ret = _history_expand_command (str, i, (j - i), &tmp);
if (ret > 0 && tmp) {
len = strlen(tmp);
ADD_STRING(tmp, len, 1);
}
if (tmp) {
free(tmp);
tmp = NULL;
}
i = j;
}
/* ret is 2 for "print only" option */
if (ret == 2) {
add_history(result);
#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 */
ret = -1;
#endif
}
free(*output);
*output = result;
return (ret);
}
/*
* Return a string consisting of arguments of "str" from "start" to "end".
*/
char *
history_arg_extract(int start, int end, const char *str)
{
size_t i, len, max;
char **arr, *result;
arr = history_tokenize(str);
if (!arr)
return(NULL);
if (arr && *arr == NULL) {
free(arr);
return(NULL);
}
for (max = 0; arr[max]; max++)
continue;
max--;
if (start == '$')
start = max;
if (end == '$')
end = max;
if (end < 0)
end = max + end + 1;
if (start < 0)
start = end;
if (start < 0 || end < 0 || start > max || end > max || start > end)
return(NULL);
for (i = start, len = 0; i <= end; i++)
len += strlen(arr[i]) + 1;
len++;
result = malloc(len);
if (result == NULL)
return NULL;
for (i = start, len = 0; i <= end; i++) {
(void)strcpy(result + len, arr[i]);
len += strlen(arr[i]);
if (i < end)
result[len++] = ' ';
}
result[len] = 0;
for (i = 0; arr[i]; i++)
free(arr[i]);
free(arr);
return(result);
}
/*
* Parse the string into individual tokens,
* similar to how shell would do it.
*/
char **
history_tokenize(const char *str)
{
int size = 1, idx = 0, i, start;
size_t len;
char **result = NULL, *temp, delim = '\0';
for (i = 0; str[i];) {
while (isspace((unsigned char) str[i]))
i++;
start = i;
for (; str[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 (str[i])
i++;
}
if (idx + 2 >= size) {
char **nresult;
size <<= 1;
nresult = realloc(result, size * sizeof(char *));
if (nresult == NULL) {
free(result);
return NULL;
}
result = nresult;
}
len = i - start;
temp = malloc(len + 1);
if (temp == NULL) {
for (i = 0; i < idx; i++)
free(result[i]);
free(result);
return NULL;
}
(void)strncpy(temp, &str[start], len);
temp[len] = '\0';
result[idx++] = temp;
result[idx] = NULL;
if (str[i])
i++;
}
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) == -1);
}
/*
* 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) == -1);
}
/*
* returns history ``num''th event
*
* returned pointer points to static variable
*/
HIST_ENTRY *
history_get(int num)
{
static HIST_ENTRY she;
HistEvent ev;
int curr_num;
if (h == NULL || e == NULL)
rl_initialize();
/* save current position */
if (history(h, &ev, H_CURR) != 0)
return (NULL);
curr_num = ev.num;
/* start from most recent */
if (history(h, &ev, H_FIRST) != 0)
return (NULL); /* error */
/* look backwards for event matching specified offset */
if (history(h, &ev, H_NEXT_EVENT, num))
return (NULL);
she.line = ev.str;
she.data = NULL;
/* restore pointer to where it was */
(void)history(h, &ev, H_SET, 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 */
}
/*
* remove the specified entry from the history list and return it.
*/
HIST_ENTRY *
remove_history(int num)
{
static HIST_ENTRY she;
HistEvent ev;
if (h == NULL || e == NULL)
rl_initialize();
if (history(h, &ev, H_DEL, num) != 0)
return NULL;
she.line = ev.str;
she.data = NULL;
return &she;
}
/*
* 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 curr_num;
if (pos > history_length || pos < 0)
return (-1);
history(h, &ev, H_CURR);
curr_num = ev.num;
if (history(h, &ev, H_SET, pos)) {
history(h, &ev, H_SET, 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));
}
/*
* searches for first history event containing the str
*/
int
history_search(const char *str, int direction)
{
HistEvent ev;
const char *strp;
int curr_num;
if (history(h, &ev, H_CURR) != 0)
return (-1);
curr_num = ev.num;
for (;;) {
if ((strp = strstr(ev.str, str)) != NULL)
return (int) (strp - ev.str);
if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
break;
}
history(h, &ev, H_SET, curr_num);
return (-1);
}
/*
* searches for first history event beginning with str
*/
int
history_search_prefix(const char *str, int direction)
{
HistEvent ev;
return (history(h, &ev, direction < 0? H_PREV_STR:H_NEXT_STR, str));
}
/*
* 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 __attribute__((__unused__)), 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);
}
/********************************/
/* completion functions */
char *
tilde_expand(char *name)
{
return fn_tilde_expand(name);
}
char *
filename_completion_function(const char *name, int state)
{
return fn_filename_completion_function(name, state);
}
/*
* 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, pwres;
char pwbuf[1024];
if (text[0] == '\0')
return (NULL);
if (*text == '~')
text++;
if (state == 0)
setpwent();
while (getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pwd) == 0
&& pwd != NULL && 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 to send TSTP on ^Z
*/
/* ARGSUSED */
static unsigned char
_el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
{
(void)kill(0, SIGTSTP);
return CC_NORM;
}
/*
* 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(char **matches, int len, int max)
{
fn_display_match_list(e, matches, len, max);
}
static const char *
/*ARGSUSED*/
_rl_completion_append_character_function(const char *dummy
__attribute__((__unused__)))
{
static char buf[2];
buf[1] = rl_completion_append_character;
return buf;
}
/*
* complete word at current point
*/
/* ARGSUSED */
int
rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
{
if (h == NULL || e == NULL)
rl_initialize();
if (rl_inhibit_completion) {
char arr[2];
arr[0] = (char)invoking_key;
arr[1] = '\0';
el_insertstr(e, arr);
return (CC_REFRESH);
}
/* Just look at how many global variables modify this operation! */
return fn_complete(e,
(CPFunction *)rl_completion_entry_function,
rl_attempted_completion_function,
rl_basic_word_break_characters, rl_special_prefixes,
_rl_completion_append_character_function, rl_completion_query_items,
&rl_completion_type, &rl_attempted_completion_over,
&rl_point, &rl_end);
}
/* ARGSUSED */
static unsigned char
_el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
{
return (unsigned char)rl_complete(0, ch);
}
/*
* 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 __attribute__((__unused__)))
{
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);
}
/*ARGSUSED*/
int
rl_newline(int count, int c)
{
/*
* Readline-4.0 appears to ignore the args.
*/
return rl_insert(1, '\n');
}
/*ARGSUSED*/
static unsigned char
rl_bind_wrapper(EditLine *el, unsigned char c)
{
if (map[c] == NULL)
return CC_ERROR;
_rl_update_pos();
(*map[c])(NULL, c);
/* If rl_done was set by the above call, deal with it here */
if (rl_done)
return CC_EOF;
return CC_NORM;
}
int
rl_add_defun(const char *name, Function *fun, int c)
{
char dest[8];
if (c >= sizeof(map) / sizeof(map[0]) || c < 0)
return -1;
map[(unsigned char)c] = fun;
el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
el_set(e, EL_BIND, dest, name);
return 0;
}
void
rl_callback_read_char()
{
int count = 0, done = 0;
const char *buf = el_gets(e, &count);
char *wbuf;
if (buf == NULL || count-- <= 0)
return;
if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
done = 1;
if (buf[count] == '\n' || buf[count] == '\r')
done = 2;
if (done && rl_linefunc != NULL) {
el_set(e, EL_UNBUFFERED, 0);
if (done == 2) {
if ((wbuf = strdup(buf)) != NULL)
wbuf[count] = '\0';
} else
wbuf = NULL;
(*(void (*)(const char *))rl_linefunc)(wbuf);
el_set(e, EL_UNBUFFERED, 1);
}
}
void
rl_callback_handler_install (const char *prompt, VCPFunction *linefunc)
{
if (e == NULL) {
rl_initialize();
}
if (rl_prompt)
free(rl_prompt);
rl_prompt = prompt ? strdup(strchr(prompt, *prompt)) : NULL;
rl_linefunc = linefunc;
el_set(e, EL_UNBUFFERED, 1);
}
void
rl_callback_handler_remove(void)
{
el_set(e, EL_UNBUFFERED, 0);
}
void
rl_redisplay(void)
{
char a[2];
a[0] = e->el_tty.t_c[TS_IO][C_REPRINT];
a[1] = '\0';
el_push(e, a);
}
int
rl_get_previous_history(int count, int key)
{
char a[2];
a[0] = key;
a[1] = '\0';
while (count--)
el_push(e, a);
return 0;
}
void
/*ARGSUSED*/
rl_prep_terminal(int meta_flag)
{
el_set(e, EL_PREP_TERM, 1);
}
void
rl_deprep_terminal()
{
el_set(e, EL_PREP_TERM, 0);
}
int
rl_read_init_file(const char *s)
{
return(el_source(e, s));
}
int
rl_parse_and_bind(const char *line)
{
const char **argv;
int argc;
Tokenizer *tok;
tok = tok_init(NULL);
tok_str(tok, line, &argc, &argv);
argc = el_parse(e, argc, argv);
tok_end(tok);
return (argc ? 1 : 0);
}
int
rl_variable_bind(const char *var, const char *value)
{
/*
* The proper return value is undocument, but this is what the
* readline source seems to do.
*/
return ((el_set(e, EL_BIND, "", var, value) == -1) ? 1 : 0);
}
void
rl_stuff_char(int c)
{
char buf[2];
buf[0] = c;
buf[1] = '\0';
el_insertstr(e, buf);
}
static int
_rl_event_read_char(EditLine *el, char *cp)
{
int n, num_read = 0;
*cp = 0;
while (rl_event_hook) {
(*rl_event_hook)();
#if defined(FIONREAD)
if (ioctl(el->el_infd, FIONREAD, &n) < 0)
return(-1);
if (n)
num_read = read(el->el_infd, cp, 1);
else
num_read = 0;
#elif defined(F_SETFL) && defined(O_NDELAY)
if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
return(-1);
if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
return(-1);
num_read = read(el->el_infd, cp, 1);
if (fcntl(el->el_infd, F_SETFL, n))
return(-1);
#else
/* not non-blocking, but what you gonna do? */
num_read = read(el->el_infd, cp, 1);
return(-1);
#endif
if (num_read < 0 && errno == EAGAIN)
continue;
if (num_read == 0)
continue;
break;
}
if (!rl_event_hook)
el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
return(num_read);
}
static void
_rl_update_pos(void)
{
const LineInfo *li = el_line(e);
rl_point = li->cursor - li->buffer;
rl_end = li->lastchar - li->buffer;
}
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