/* $NetBSD: filecomplete.c,v 1.40 2016/02/17 19:47:49 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.
*
* 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: filecomplete.c,v 1.40 2016/02/17 19:47:49 christos Exp $");
#endif /* not lint && not SCCSID */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "el.h"
#include "filecomplete.h"
static const Char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@',
'$', '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
/* Tilde is deliberately omitted here, we treat it specially. */
static const Char extra_quote_chars[] = { ')', '}', '*', '?', '[', '$', '\0' };
/********************************/
/* completion 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 the caller's responsibility to free() the returned string
*/
char *
fn_tilde_expand(const char *txt)
{
#if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
struct passwd pwres;
char pwbuf[1024];
#endif
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);
if (temp == NULL)
return NULL;
} else {
/* text until string after slash */
len = (size_t)(temp - txt + 1);
temp = el_malloc(len * sizeof(*temp));
if (temp == NULL)
return NULL;
(void)strncpy(temp, txt + 1, len - 2);
temp[len - 2] = '\0';
}
if (temp[0] == 0) {
#ifdef HAVE_GETPW_R_POSIX
if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
&pass) != 0)
pass = NULL;
#elif HAVE_GETPW_R_DRAFT
pass = getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf));
#else
pass = getpwuid(getuid());
#endif
} else {
#ifdef HAVE_GETPW_R_POSIX
if (getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf), &pass) != 0)
pass = NULL;
#elif HAVE_GETPW_R_DRAFT
pass = getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf));
#else
pass = getpwnam(temp);
#endif
}
el_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;
len = strlen(pass->pw_dir) + 1 + strlen(txt) + 1;
temp = el_malloc(len * sizeof(*temp));
if (temp == NULL)
return NULL;
(void)snprintf(temp, len, "%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 the caller's responsibility to free the returned string
*/
char *
fn_filename_completion_function(const char *text, int state)
{
static DIR *dir = NULL;
static char *filename = NULL, *dirname = NULL, *dirpath = NULL;
static size_t filename_len = 0;
struct dirent *entry;
char *temp;
size_t len;
if (state == 0 || dir == NULL) {
temp = strrchr(text, '/');
if (temp) {
char *nptr;
temp++;
nptr = el_realloc(filename, (strlen(temp) + 1) *
sizeof(*nptr));
if (nptr == NULL) {
el_free(filename);
filename = NULL;
return NULL;
}
filename = nptr;
(void)strcpy(filename, temp);
len = (size_t)(temp - text); /* including last slash */
nptr = el_realloc(dirname, (len + 1) *
sizeof(*nptr));
if (nptr == NULL) {
el_free(dirname);
dirname = NULL;
return NULL;
}
dirname = nptr;
(void)strncpy(dirname, text, len);
dirname[len] = '\0';
} else {
el_free(filename);
if (*text == 0)
filename = NULL;
else {
filename = strdup(text);
if (filename == NULL)
return NULL;
}
el_free(dirname);
dirname = NULL;
}
if (dir != NULL) {
(void)closedir(dir);
dir = NULL;
}
/* support for ``~user'' syntax */
el_free(dirpath);
dirpath = NULL;
if (dirname == NULL) {
if ((dirname = strdup("")) == NULL)
return NULL;
dirpath = strdup("./");
} else if (*dirname == '~')
dirpath = fn_tilde_expand(dirname);
else
dirpath = strdup(dirname);
if (dirpath == NULL)
return NULL;
dir = opendir(dirpath);
if (!dir)
return NULL; /* cannot open the directory */
/* will be used in cycle */
filename_len = filename ? strlen(filename) : 0;
}
/* find the match */
while ((entry = readdir(dir)) != NULL) {
/* skip . and .. */
if (entry->d_name[0] == '.' && (!entry->d_name[1]
|| (entry->d_name[1] == '.' && !entry->d_name[2])))
continue;
if (filename_len == 0)
break;
/* otherwise, get first entry where first */
/* filename_len characters are equal */
if (entry->d_name[0] == filename[0]
#if HAVE_STRUCT_DIRENT_D_NAMLEN
&& entry->d_namlen >= filename_len
#else
&& strlen(entry->d_name) >= filename_len
#endif
&& strncmp(entry->d_name, filename,
filename_len) == 0)
break;
}
if (entry) { /* match found */
#if HAVE_STRUCT_DIRENT_D_NAMLEN
len = entry->d_namlen;
#else
len = strlen(entry->d_name);
#endif
len = strlen(dirname) + len + 1;
temp = el_malloc(len * sizeof(*temp));
if (temp == NULL)
return NULL;
(void)snprintf(temp, len, "%s%s", dirname, entry->d_name);
} else {
(void)closedir(dir);
dir = NULL;
temp = NULL;
}
return temp;
}
static const char *
append_char_function(const char *name)
{
struct stat stbuf;
char *expname = *name == '~' ? fn_tilde_expand(name) : NULL;
const char *rs = " ";
if (stat(expname ? expname : name, &stbuf) == -1)
goto out;
if (S_ISDIR(stbuf.st_mode))
rs = "/";
out:
if (expname)
el_free(expname);
return rs;
}
/*
* returns list of completions for text given
* non-static for readline.
*/
char ** completion_matches(const char *, char *(*)(const char *, int));
char **
completion_matches(const char *text, char *(*genfunc)(const char *, int))
{
char **match_list = NULL, *retstr, *prevstr;
size_t match_list_len, max_equal, which, i;
size_t matches;
matches = 0;
match_list_len = 1;
while ((retstr = (*genfunc) (text, (int)matches)) != NULL) {
/* allow for list terminator here */
if (matches + 3 >= match_list_len) {
char **nmatch_list;
while (matches + 3 >= match_list_len)
match_list_len <<= 1;
nmatch_list = el_realloc(match_list,
match_list_len * sizeof(*nmatch_list));
if (nmatch_list == NULL) {
el_free(match_list);
return NULL;
}
match_list = nmatch_list;
}
match_list[++matches] = retstr;
}
if (!match_list)
return 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 = el_malloc((max_equal + 1) * sizeof(*retstr));
if (retstr == NULL) {
el_free(match_list);
return NULL;
}
(void)strncpy(retstr, match_list[1], max_equal);
retstr[max_equal] = '\0';
match_list[0] = retstr;
/* add NULL as last pointer to the array */
match_list[matches + 1] = NULL;
return match_list;
}
/*
* Sort function for qsort(). Just wrapper around strcasecmp().
*/
static int
_fn_qsort_string_compare(const void *i1, const void *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, 'num' is number of strings in 'matches',
* 'width' is maximum length of string in 'matches'.
*
* matches[0] is not one of the match strings, but it is counted in
* num, so the strings are matches[1] *through* matches[num-1].
*/
void
fn_display_match_list (EditLine *el, char **matches, size_t num, size_t width)
{
size_t line, lines, col, cols, thisguy;
int screenwidth = el->el_terminal.t_size.h;
/* Ignore matches[0]. Avoid 1-based array logic below. */
matches++;
num--;
/*
* Find out how many entries can be put on one line; count
* with one space between strings the same way it's printed.
*/
cols = (size_t)screenwidth / (width + 1);
if (cols == 0)
cols = 1;
/* how many lines of output, rounded up */
lines = (num + cols - 1) / cols;
/* Sort the items. */
qsort(matches, num, sizeof(char *), _fn_qsort_string_compare);
/*
* On the ith line print elements i, i+lines, i+lines*2, etc.
*/
for (line = 0; line < lines; line++) {
for (col = 0; col < cols; col++) {
thisguy = line + col * lines;
if (thisguy >= num)
break;
(void)fprintf(el->el_outfile, "%s%-*s",
col == 0 ? "" : " ", (int)width, matches[thisguy]);
}
(void)fprintf(el->el_outfile, "\n");
}
}
/*
* Complete the word at or before point,
* 'what_to_do' says what to do with the completion.
* \t means do standard completion.
* `?' means list the possible completions.
* `*' 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
* '!' could never be invoked
*/
int
fn_complete(EditLine *el,
char *(*complet_func)(const char *, int),
char **(*attempted_completion_function)(const char *, int, int),
const Char *word_break, const Char *special_prefixes,
const char *(*app_func)(const char *), size_t query_items,
int *completion_type, int *over, int *point, int *end,
const Char *(*find_word_start_func)(const Char *, const Char *),
Char *(*dequoting_func)(const Char *),
char *(*quoting_func)(const char *))
{
const TYPE(LineInfo) *li;
Char *temp;
Char *dequoted_temp;
char **matches;
const Char *ctemp;
size_t len;
int what_to_do = '\t';
int retval = CC_NORM;
if (el->el_state.lastcmd == el->el_state.thiscmd)
what_to_do = '?';
/* readline's rl_complete() has to be told what we did... */
if (completion_type != NULL)
*completion_type = what_to_do;
if (!complet_func)
complet_func = fn_filename_completion_function;
if (!app_func)
app_func = append_char_function;
/* We now look backwards for the start of a filename/variable word */
li = FUN(el,line)(el);
if (find_word_start_func)
ctemp = find_word_start_func(li->buffer, li->cursor);
else {
ctemp = li->cursor;
while (ctemp > li->buffer
&& !Strchr(word_break, ctemp[-1])
&& (!special_prefixes || !Strchr(special_prefixes, ctemp[-1]) ) )
ctemp--;
}
len = (size_t)(li->cursor - ctemp);
temp = el_malloc((len + 1) * sizeof(*temp));
(void)Strncpy(temp, ctemp, len);
temp[len] = '\0';
if (dequoting_func) {
dequoted_temp = dequoting_func(temp);
if (dequoted_temp == NULL)
return retval;
} else
dequoted_temp = NULL;
/* these can be used by function called in completion_matches() */
/* or (*attempted_completion_function)() */
if (point != NULL)
*point = (int)(li->cursor - li->buffer);
if (end != NULL)
*end = (int)(li->lastchar - li->buffer);
if (attempted_completion_function) {
int cur_off = (int)(li->cursor - li->buffer);
matches = (*attempted_completion_function)(
ct_encode_string(dequoted_temp ? dequoted_temp : temp,
&el->el_scratch),
cur_off - (int)len, cur_off);
} else
matches = NULL;
if (!attempted_completion_function ||
(over != NULL && !*over && !matches))
matches = completion_matches(
ct_encode_string(dequoted_temp ? dequoted_temp : temp,
&el->el_scratch), complet_func);
if (over != NULL)
*over = 0;
if (matches) {
int i;
size_t matches_num, maxlen, match_len, match_display=1;
retval = CC_REFRESH;
/*
* Only replace the completed string with common part of
* possible matches if there is possible completion.
*/
if (matches[0][0] != '\0') {
char *quoted_match;
if (quoting_func) {
quoted_match = quoting_func(matches[0]);
if (quoted_match == NULL)
goto free_matches;
} else
quoted_match = NULL;
el_deletestr(el, (int) len);
FUN(el,insertstr)(el,
ct_decode_string(quoted_match ? quoted_match :
matches[0] , &el->el_scratch));
}
if (what_to_do == '?')
goto display_matches;
if (matches[2] == NULL &&
(matches[1] == NULL || strcmp(matches[0], matches[1]) == 0)) {
/*
* We found exact match. Add a space after
* it, unless we do filename completion and the
* object is a directory.
*/
FUN(el,insertstr)(el,
ct_decode_string((*app_func)(matches[0]),
&el->el_scratch));
} 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[1] through matches[i-1] are available */
matches_num = (size_t)(i - 1);
/* newline to get on next line from command line */
(void)fprintf(el->el_outfile, "\n");
/*
* If there are too many items, ask user for display
* confirmation.
*/
if (matches_num > query_items) {
(void)fprintf(el->el_outfile,
"Display all %zu possibilities? (y or n) ",
matches_num);
(void)fflush(el->el_outfile);
if (getc(stdin) != 'y')
match_display = 0;
(void)fprintf(el->el_outfile, "\n");
}
if (match_display) {
/*
* Interface of this function requires the
* strings be matches[1..num-1] for compat.
* We have matches_num strings not counting
* the prefix in matches[0], so we need to
* add 1 to matches_num for the call.
*/
fn_display_match_list(el, matches,
matches_num+1, 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(el);
} else {
/* lcd is not a valid object - further specification */
/* is needed */
el_beep(el);
retval = CC_NORM;
}
free_matches:
/* free elements of array and the array itself */
for (i = 0; matches[i]; i++)
el_free(matches[i]);
el_free(matches);
matches = NULL;
}
free(dequoted_temp);
el_free(temp);
return retval;
}
/*
* el-compatible wrapper around rl_complete; needed for key binding
*/
/* ARGSUSED */
unsigned char
_el_fn_complete(EditLine *el, int ch __attribute__((__unused__)))
{
return (unsigned char)fn_complete(el, NULL, NULL,
break_chars, NULL, NULL, (size_t)100,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL);
}
static const Char *
sh_find_word_start(const Char *buffer, const Char *cursor)
{
const Char *word_start = buffer;
while (buffer < cursor) {
if (*buffer == '\\')
buffer++;
else if (Strchr(break_chars, *buffer))
word_start = buffer + 1;
buffer++;
}
return word_start;
}
static char *
sh_quote(const char *str)
{
const char *src;
int extra_len = 0;
char *quoted_str, *dst;
for (src = str; *src != '\0'; src++)
if (Strchr(break_chars, *src) ||
Strchr(extra_quote_chars, *src))
extra_len++;
quoted_str = malloc(sizeof(*quoted_str) *
(strlen(str) + extra_len + 1));
if (quoted_str == NULL)
return NULL;
dst = quoted_str;
for (src = str; *src != '\0'; src++) {
if (Strchr(break_chars, *src) ||
Strchr(extra_quote_chars, *src))
*dst++ = '\\';
*dst++ = *src;
}
*dst = '\0';
return quoted_str;
}
static Char *
sh_dequote(const Char *str)
{
Char *dequoted_str, *dst;
/* save extra space to replace \~ with ./~ */
dequoted_str = malloc(sizeof(*dequoted_str) * (Strlen(str) + 1 + 1));
if (dequoted_str == NULL)
return NULL;
dst = dequoted_str;
/* dequote \~ at start as ./~ */
if (*str == '\\' && str[1] == '~') {
str++;
*dst++ = '.';
*dst++ = '/';
}
while (*str) {
if (*str == '\\')
str++;
if (*str)
*dst++ = *str++;
}
*dst = '\0';
return dequoted_str;
}
/*
* completion function using sh quoting rules; for key binding
*/
/* ARGSUSED */
unsigned char
_el_fn_sh_complete(EditLine *el, int ch __attribute__((__unused__)))
{
return (unsigned char)fn_complete(el, NULL, NULL,
break_chars, NULL, NULL, 100,
NULL, NULL, NULL, NULL,
sh_find_word_start, sh_dequote, sh_quote);
}
