NetBSD-5.0.2/bin/csh/file.c
/* $NetBSD: file.c,v 1.27 2007/07/16 18:26:10 christos Exp $ */
/*-
* Copyright (c) 1980, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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. Neither the name of the University 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 REGENTS 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 REGENTS 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 <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)file.c 8.2 (Berkeley) 3/19/94";
#else
__RCSID("$NetBSD: file.c,v 1.27 2007/07/16 18:26:10 christos Exp $");
#endif
#endif /* not lint */
#ifdef FILEC
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/tty.h>
#include <dirent.h>
#include <pwd.h>
#include <termios.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef SHORT_STRINGS
#include <string.h>
#endif /* SHORT_STRINGS */
#include "csh.h"
#include "extern.h"
/*
* Tenex style file name recognition, .. and more.
* History:
* Author: Ken Greer, Sept. 1975, CMU.
* Finally got around to adding to the Cshell., Ken Greer, Dec. 1981.
*/
#define ON 1
#define OFF 0
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define ESC '\033'
typedef enum {
LIST, RECOGNIZE
} COMMAND;
static void setup_tty(int);
static void back_to_col_1(void);
static int pushback(Char *);
static void catn(Char *, Char *, int);
static void copyn(Char *, Char *, int);
static Char filetype(Char *, Char *);
static void print_by_column(Char *, Char *[], int);
static Char *tilde(Char *, Char *);
static void retype(void);
static void beep(void);
static void print_recognized_stuff(Char *);
static void extract_dir_and_name(Char *, Char *, Char *);
static Char *getentry(DIR *, int);
static void free_items(Char **, size_t);
static int tsearch(Char *, COMMAND, int);
static int recognize(Char *, Char *, int, int);
static int is_prefix(Char *, Char *);
static int is_suffix(Char *, Char *);
static int ignored(Char *);
/*
* Put this here so the binary can be patched with adb to enable file
* completion by default. Filec controls completion, nobeep controls
* ringing the terminal bell on incomplete expansions.
*/
int filec = 0;
static void
setup_tty(int on)
{
struct termios tchars;
(void)tcgetattr(SHIN, &tchars);
if (on) {
tchars.c_cc[VEOL] = ESC;
if (tchars.c_lflag & ICANON)
on = TCSADRAIN;
else {
tchars.c_lflag |= ICANON;
on = TCSAFLUSH;
}
}
else {
tchars.c_cc[VEOL] = _POSIX_VDISABLE;
on = TCSADRAIN;
}
(void)tcsetattr(SHIN, on, &tchars);
}
/*
* Move back to beginning of current line
*/
static void
back_to_col_1(void)
{
struct termios tty, tty_normal;
sigset_t nsigset, osigset;
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
(void)tcgetattr(SHOUT, &tty);
tty_normal = tty;
tty.c_iflag &= ~INLCR;
tty.c_oflag &= ~ONLCR;
(void)tcsetattr(SHOUT, TCSADRAIN, &tty);
(void)write(SHOUT, "\r", 1);
(void)tcsetattr(SHOUT, TCSADRAIN, &tty_normal);
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
}
/*
* Push string contents back into tty queue
*/
static int
pushback(Char *string)
{
struct termios tty, tty_normal;
char buf[TTYHOG], svchars[TTYHOG];
sigset_t nsigset, osigset;
Char *p;
int bufidx, i, len_str, nbuf, nsv, onsv, retrycnt;
char c;
nsv = 0;
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
(void)tcgetattr(SHOUT, &tty);
tty_normal = tty;
tty.c_lflag &= ~(ECHOKE | ECHO | ECHOE | ECHOK | ECHONL | ECHOPRT | ECHOCTL);
/* FIONREAD works only in noncanonical mode. */
tty.c_lflag &= ~ICANON;
tty.c_cc[VMIN] = 0;
(void)tcsetattr(SHOUT, TCSADRAIN, &tty);
for (retrycnt = 5; ; retrycnt--) {
/*
* Push back characters.
*/
for (p = string; (c = *p) != '\0'; p++)
(void)ioctl(SHOUT, TIOCSTI, (ioctl_t) &c);
for (i = 0; i < nsv; i++)
(void)ioctl(SHOUT, TIOCSTI, (ioctl_t) &svchars[i]);
if (retrycnt == 0)
break; /* give up salvaging characters */
len_str = p - string;
if (ioctl(SHOUT, FIONREAD, (ioctl_t) &nbuf) ||
nbuf <= len_str + nsv || /* The string fit. */
nbuf > TTYHOG) /* For future binary compatibility
(and safety). */
break;
/*
* User has typed characters before the pushback finished.
* Salvage the characters.
*/
/* This read() should be in noncanonical mode. */
if (read(SHOUT, &buf, nbuf) != nbuf)
continue; /* hangup? */
onsv = nsv;
for (bufidx = 0, i = 0; bufidx < nbuf; bufidx++, i++) {
c = buf[bufidx];
if ((i < len_str) ? c != (char)string[i] :
(i < len_str + onsv) ? c != svchars[i - len_str] : 1) {
/* Salvage a character. */
if (nsv < (int)(sizeof svchars / sizeof svchars[0])) {
svchars[nsv++] = c;
i--; /* try this comparison with the next char */
} else
break; /* too many */
}
}
}
#if 1
/*
* XXX Is this a bug or a feature of kernel tty driver?
*
* FIONREAD in canonical mode does not return correct byte count
* in tty input queue, but this is required to avoid unwanted echo.
*/
tty.c_lflag |= ICANON;
(void)tcsetattr(SHOUT, TCSADRAIN, &tty);
(void)ioctl(SHOUT, FIONREAD, (ioctl_t) &i);
#endif
(void)tcsetattr(SHOUT, TCSADRAIN, &tty_normal);
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
return nsv;
}
/*
* Concatenate src onto tail of des.
* Des is a string whose maximum length is count.
* Always null terminate.
*/
static void
catn(Char *des, Char *src, int count)
{
while (--count >= 0 && *des)
des++;
while (--count >= 0)
if ((*des++ = *src++) == 0)
return;
*des = '\0';
}
/*
* Like strncpy but always leave room for trailing \0
* and always null terminate.
*/
static void
copyn(Char *des, Char *src, int count)
{
while (--count >= 0)
if ((*des++ = *src++) == 0)
return;
*des = '\0';
}
static Char
filetype(Char *dir, Char *file)
{
struct stat statb;
Char path[MAXPATHLEN];
catn(Strcpy(path, dir), file, sizeof(path) / sizeof(Char));
if (lstat(short2str(path), &statb) == 0) {
switch (statb.st_mode & S_IFMT) {
case S_IFDIR:
return ('/');
case S_IFLNK:
if (stat(short2str(path), &statb) == 0 && /* follow it out */
S_ISDIR(statb.st_mode))
return ('>');
else
return ('@');
case S_IFSOCK:
return ('=');
default:
if (statb.st_mode & 0111)
return ('*');
}
}
return (' ');
}
static struct winsize win;
/*
* Print sorted down columns
*/
static void
print_by_column(Char *dir, Char *items[], int count)
{
int c, columns, i, maxwidth, r, rows;
maxwidth = 0;
if (ioctl(SHOUT, TIOCGWINSZ, (ioctl_t) & win) < 0 || win.ws_col == 0)
win.ws_col = 80;
for (i = 0; i < count; i++)
maxwidth = maxwidth > (r = Strlen(items[i])) ? maxwidth : r;
maxwidth += 2; /* for the file tag and space */
columns = win.ws_col / maxwidth;
if (columns == 0)
columns = 1;
rows = (count + (columns - 1)) / columns;
for (r = 0; r < rows; r++) {
for (c = 0; c < columns; c++) {
i = c * rows + r;
if (i < count) {
int w;
(void)fprintf(cshout, "%s", vis_str(items[i]));
(void)fputc(dir ? filetype(dir, items[i]) : ' ', cshout);
if (c < columns - 1) { /* last column? */
w = Strlen(items[i]) + 1;
for (; w < maxwidth; w++)
(void) fputc(' ', cshout);
}
}
}
(void)fputc('\r', cshout);
(void)fputc('\n', cshout);
}
}
/*
* Expand file name with possible tilde usage
* ~person/mumble
* expands to
* home_directory_of_person/mumble
*/
static Char *
tilde(Char *new, Char *old)
{
static Char person[40];
struct passwd *pw;
Char *o, *p;
if (old[0] != '~')
return (Strcpy(new, old));
for (p = person, o = &old[1]; *o && *o != '/'; *p++ = *o++)
continue;
*p = '\0';
if (person[0] == '\0')
(void)Strcpy(new, value(STRhome));
else {
pw = getpwnam(short2str(person));
if (pw == NULL)
return (NULL);
(void)Strcpy(new, str2short(pw->pw_dir));
}
(void)Strcat(new, o);
return (new);
}
/*
* Cause pending line to be printed
*/
static void
retype(void)
{
struct termios tty;
(void)tcgetattr(SHOUT, &tty);
tty.c_lflag |= PENDIN;
(void)tcsetattr(SHOUT, TCSADRAIN, &tty);
}
static void
beep(void)
{
if (adrof(STRnobeep) == 0)
(void)write(SHOUT, "\007", 1);
}
/*
* Erase that silly ^[ and
* print the recognized part of the string
*/
static void
print_recognized_stuff(Char *recognized_part)
{
/* An optimized erasing of that silly ^[ */
(void)fputc('\b', cshout);
(void)fputc('\b', cshout);
switch (Strlen(recognized_part)) {
case 0: /* erase two Characters: ^[ */
(void)fputc(' ', cshout);
(void)fputc(' ', cshout);
(void)fputc('\b', cshout);
(void)fputc('\b', cshout);
break;
case 1: /* overstrike the ^, erase the [ */
(void)fprintf(cshout, "%s", vis_str(recognized_part));
(void)fputc(' ', cshout);
(void)fputc('\b', cshout);
break;
default: /* overstrike both Characters ^[ */
(void)fprintf(cshout, "%s", vis_str(recognized_part));
break;
}
(void)fflush(cshout);
}
/*
* Parse full path in file into 2 parts: directory and file names
* Should leave final slash (/) at end of dir.
*/
static void
extract_dir_and_name(Char *path, Char *dir, Char *name)
{
Char *p;
p = Strrchr(path, '/');
if (p == NULL) {
copyn(name, path, MAXNAMLEN);
dir[0] = '\0';
}
else {
copyn(name, ++p, MAXNAMLEN);
copyn(dir, path, p - path);
}
}
static Char *
getentry(DIR *dir_fd, int looking_for_lognames)
{
struct dirent *dirp;
struct passwd *pw;
if (looking_for_lognames) {
if ((pw = getpwent()) == NULL)
return (NULL);
return (str2short(pw->pw_name));
}
if ((dirp = readdir(dir_fd)) != NULL)
return (str2short(dirp->d_name));
return (NULL);
}
static void
free_items(Char **items, size_t numitems)
{
size_t i;
for (i = 0; i < numitems; i++)
xfree((ptr_t) items[i]);
xfree((ptr_t) items);
}
#define FREE_ITEMS(items, numitems) { \
sigset_t nsigset, osigset;\
\
sigemptyset(&nsigset);\
(void) sigaddset(&nsigset, SIGINT);\
(void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);\
free_items(items, numitems);\
(void) sigprocmask(SIG_SETMASK, &osigset, NULL);\
}
/*
* Perform a RECOGNIZE or LIST command on string "word".
*/
static int
tsearch(Char *word, COMMAND command, int max_word_length)
{
Char dir[MAXPATHLEN + 1], extended_name[MAXNAMLEN + 1];
Char name[MAXNAMLEN + 1], tilded_dir[MAXPATHLEN + 1];
DIR *dir_fd;
Char *entry;
int ignoring, looking_for_lognames, name_length, nignored, numitems;
Char **items = NULL;
size_t maxitems = 0;
numitems = 0;
ignoring = TRUE;
nignored = 0;
looking_for_lognames = (*word == '~') && (Strchr(word, '/') == NULL);
if (looking_for_lognames) {
(void)setpwent();
copyn(name, &word[1], MAXNAMLEN); /* name sans ~ */
dir_fd = NULL;
}
else {
extract_dir_and_name(word, dir, name);
if (tilde(tilded_dir, dir) == 0)
return (0);
dir_fd = opendir(*tilded_dir ? short2str(tilded_dir) : ".");
if (dir_fd == NULL)
return (0);
}
again: /* search for matches */
name_length = Strlen(name);
for (numitems = 0; (entry = getentry(dir_fd, looking_for_lognames)) != NULL;) {
if (!is_prefix(name, entry))
continue;
/* Don't match . files on null prefix match */
if (name_length == 0 && entry[0] == '.' &&
!looking_for_lognames)
continue;
if (command == LIST) {
if (numitems >= maxitems) {
maxitems += 1024;
if (items == NULL)
items = (Char **) xmalloc(sizeof(*items) * maxitems);
else
items = (Char **) xrealloc((ptr_t) items,
sizeof(*items) * maxitems);
}
items[numitems] = (Char *)xmalloc((size_t) (Strlen(entry) + 1) *
sizeof(Char));
copyn(items[numitems], entry, MAXNAMLEN);
numitems++;
}
else { /* RECOGNIZE command */
if (ignoring && ignored(entry))
nignored++;
else if (recognize(extended_name,
entry, name_length, ++numitems))
break;
}
}
if (ignoring && numitems == 0 && nignored > 0) {
ignoring = FALSE;
nignored = 0;
if (looking_for_lognames)
(void)setpwent();
else
rewinddir(dir_fd);
goto again;
}
if (looking_for_lognames)
(void)endpwent();
else
(void)closedir(dir_fd);
if (numitems == 0)
return (0);
if (command == RECOGNIZE) {
if (looking_for_lognames)
copyn(word, STRtilde, 1);
else
/* put back dir part */
copyn(word, dir, max_word_length);
/* add extended name */
catn(word, extended_name, max_word_length);
return (numitems);
}
else { /* LIST */
qsort((ptr_t) items, numitems, sizeof(items[0]),
(int (*) (const void *, const void *)) sortscmp);
print_by_column(looking_for_lognames ? NULL : tilded_dir,
items, numitems);
if (items != NULL)
FREE_ITEMS(items, numitems);
}
return (0);
}
/*
* Object: extend what user typed up to an ambiguity.
* Algorithm:
* On first match, copy full entry (assume it'll be the only match)
* On subsequent matches, shorten extended_name to the first
* Character mismatch between extended_name and entry.
* If we shorten it back to the prefix length, stop searching.
*/
static int
recognize(Char *extended_name, Char *entry, int name_length, int numitems)
{
if (numitems == 1) /* 1st match */
copyn(extended_name, entry, MAXNAMLEN);
else { /* 2nd & subsequent matches */
Char *ent, *x;
int len = 0;
x = extended_name;
for (ent = entry; *x && *x == *ent++; x++, len++)
continue;
*x = '\0'; /* Shorten at 1st Char diff */
if (len == name_length) /* Ambiguous to prefix? */
return (-1); /* So stop now and save time */
}
return (0);
}
/*
* Return true if check matches initial Chars in template.
* This differs from PWB imatch in that if check is null
* it matches anything.
*/
static int
is_prefix(Char *check, Char *template)
{
do
if (*check == 0)
return (TRUE);
while (*check++ == *template++);
return (FALSE);
}
/*
* Return true if the Chars in template appear at the
* end of check, I.e., are its suffix.
*/
static int
is_suffix(Char *check, Char *template)
{
Char *c, *t;
for (c = check; *c++;)
continue;
for (t = template; *t++;)
continue;
for (;;) {
if (t == template)
return 1;
if (c == check || *--t != *--c)
return 0;
}
}
int
tenex(Char *inputline, int inputline_size)
{
char tinputline[BUFSIZE];
int num_read, numitems;
setup_tty(ON);
while ((num_read = read(SHIN, tinputline, BUFSIZE)) > 0) {
int i;
static Char delims[] = {' ', '\'', '"', '\t', ';', '&', '<',
'>', '(', ')', '|', '^', '%', '\0'};
Char *str_end, *word_start, last_Char, should_retype;
int space_left;
COMMAND command;
for (i = 0; i < num_read; i++)
inputline[i] = (unsigned char) tinputline[i];
last_Char = inputline[num_read - 1] & ASCII;
if (last_Char == '\n' || num_read == inputline_size)
break;
command = (last_Char == ESC) ? RECOGNIZE : LIST;
if (command == LIST)
(void)fputc('\n', cshout);
str_end = &inputline[num_read];
if (last_Char == ESC)
--str_end; /* wipeout trailing cmd Char */
*str_end = '\0';
/*
* Find LAST occurence of a delimiter in the inputline. The word start
* is one Character past it.
*/
for (word_start = str_end; word_start > inputline; --word_start)
if (Strchr(delims, word_start[-1]))
break;
space_left = inputline_size - (word_start - inputline) - 1;
numitems = tsearch(word_start, command, space_left);
if (command == RECOGNIZE) {
/* print from str_end on */
print_recognized_stuff(str_end);
if (numitems != 1) /* Beep = No match/ambiguous */
beep();
}
/*
* Tabs in the input line cause trouble after a pushback. tty driver
* won't backspace over them because column positions are now
* incorrect. This is solved by retyping over current line.
*/
should_retype = FALSE;
if (Strchr(inputline, '\t')) { /* tab Char in input line? */
back_to_col_1();
should_retype = TRUE;
}
if (command == LIST) /* Always retype after a LIST */
should_retype = TRUE;
if (pushback(inputline))
should_retype = TRUE;
if (should_retype) {
if (command == RECOGNIZE)
(void) fputc('\n', cshout);
printprompt();
}
if (should_retype)
retype();
}
setup_tty(OFF);
return (num_read);
}
static int
ignored(Char *entry)
{
struct varent *vp;
Char **cp;
if ((vp = adrof(STRfignore)) == NULL || (cp = vp->vec) == NULL)
return (FALSE);
for (; *cp != NULL; cp++)
if (is_suffix(entry, *cp))
return (TRUE);
return (FALSE);
}
#endif /* FILEC */