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NetBSD/lib/libedit/filecomplete.c

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/* $NetBSD: filecomplete.c,v 1.20 2010/11/15 21:24:31 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 1.20 2010/11/15 21:24:31 christos Exp $");
#endif /* not lint && not SCCSID */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <pwd.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_VIS_H
#include <vis.h>
#else
#include "np/vis.h"
#endif
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#include "el.h"
#include "fcns.h" /* for EL_NUM_FCNS */
#include "histedit.h"
#include "filecomplete.h"
static Char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@',
'$', '>', '<', '=', ';', '|', '&', '{', '(', '\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 callers's responsibility to free() returned string
*/
char *
fn_tilde_expand(const char *txt)
{
struct passwd pwres, *pass;
char *temp;
size_t len = 0;
char pwbuf[1024];
if (txt[0] != '~')
return (strdup(txt));
temp = strchr(txt + 1, '/');
if (temp == NULL) {
temp = strdup(txt + 1);
if (temp == NULL)
return NULL;
} else {
len = temp - txt + 1; /* text until string after slash */
temp = malloc(len);
if (temp == NULL)
return NULL;
(void)strncpy(temp, txt + 1, len - 2);
temp[len - 2] = '\0';
}
if (temp[0] == 0) {
if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf), &pass) != 0)
pass = NULL;
} else {
if (getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf), &pass) != 0)
pass = NULL;
}
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);
if (temp == NULL)
return NULL;
(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 *
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 = realloc(filename, strlen(temp) + 1);
if (nptr == NULL) {
free(filename);
filename = NULL;
return NULL;
}
filename = nptr;
(void)strcpy(filename, temp);
len = temp - text; /* including last slash */
nptr = realloc(dirname, len + 1);
if (nptr == NULL) {
free(dirname);
dirname = NULL;
return NULL;
}
dirname = nptr;
(void)strncpy(dirname, text, len);
dirname[len] = '\0';
} else {
free(filename);
if (*text == 0)
filename = NULL;
else {
filename = strdup(text);
if (filename == NULL)
return NULL;
}
free(dirname);
dirname = NULL;
}
if (dir != NULL) {
(void)closedir(dir);
dir = NULL;
}
/* support for ``~user'' syntax */
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
temp = malloc(strlen(dirname) + len + 1);
if (temp == NULL)
return NULL;
(void)sprintf(temp, "%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)
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 = realloc(match_list,
match_list_len * sizeof(char *));
if (nmatch_list == NULL) {
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 = malloc(max_equal + 1);
if (retstr == NULL) {
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] = (char *) 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, 'len' is number of strings in 'matches',
* 'max' is maximum length of string in 'matches'.
*/
void
fn_display_match_list (EditLine *el, char **matches, size_t len, size_t max)
{
size_t i, idx, limit, count;
int screenwidth = el->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 *),
_fn_qsort_string_compare);
idx = 1;
for(; count > 0; count--) {
int more = limit > 0 && matches[0];
for(i = 0; more; i++, idx++) {
more = i < limit && matches[idx + 1];
(void)fprintf(el->el_outfile, "%-*s%s", (int)max,
matches[idx], more ? " " : "");
}
(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 TYPE(LineInfo) *li;
Char *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);
ctemp = li->cursor;
while (ctemp > li->buffer
&& !Strchr(word_break, ctemp[-1])
&& (!special_prefixes || !Strchr(special_prefixes, ctemp[-1]) ) )
ctemp--;
len = li->cursor - ctemp;
#if defined(__SSP__) || defined(__SSP_ALL__)
temp = malloc(sizeof(*temp) * (len + 1));
#else
temp = alloca(sizeof(*temp) * (len + 1));
#endif
(void)Strncpy(temp, ctemp, len);
temp[len] = '\0';
/* these can be used by function called in completion_matches() */
/* or (*attempted_completion_function)() */
if (point != 0)
*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(temp, &el->el_scratch),
(int)(cur_off - len), cur_off);
} else
matches = 0;
if (!attempted_completion_function ||
(over != NULL && !*over && !matches))
matches = completion_matches(ct_encode_string(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') {
el_deletestr(el, (int) len);
FUN(el,insertstr)(el,
ct_decode_string(matches[0], &el->el_scratch));
}
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 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_num = 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)
fn_display_match_list(el, 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(el);
} else {
/* lcd is not a valid object - further specification */
/* is needed */
el_beep(el);
retval = CC_NORM;
}
/* free elements of array and the array itself */
for (i = 0; matches[i]; i++)
free(matches[i]);
free(matches);
matches = NULL;
}
#if defined(__SSP__) || defined(__SSP_ALL__)
free(temp);
#endif
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, 100,
NULL, NULL, NULL, NULL);
}
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