2.11BSD/src/bin/tcsh/sh.file.c
/* $Header: /home/hyperion/mu/christos/src/sys/tcsh-6.00/RCS/sh.file.c,v 3.0 1991/07/04 21:49:28 christos Exp $ */
/*
* sh.file.c: File completion for csh.
*/
/*-
* Copyright (c) 1980, 1991 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifdef FILEC
#include "config.h"
#ifndef lint
static char *rcsid()
{ return "$Id: sh.file.c,v 3.0 1991/07/04 21:49:28 christos Exp $"; }
#endif
#include "sh.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 __P((int));
static void back_to_col_1 __P((void));
static void pushback __P((Char *));
static void catn __P((Char *, Char *, int));
static void copyn __P((Char *, Char *, int));
static Char filetype __P((Char *, Char *));
static void print_by_column __P((Char *, Char *[], int));
static Char *tilde __P((Char *, Char *));
static void retype __P((void));
static void beep __P((void));
static void print_recog_stuff __P((Char *));
static void extract_dir_and_name __P((Char *, Char *, Char *));
static Char *getentry __P((DIR *, int));
static void free_items __P((Char **));
static int tsearch __P((Char *, COMMAND, int));
static int recognize __P((Char *, Char *, int, int));
static int is_prefix __P((Char *, Char *));
static int is_suffix __P((Char *, Char *));
static int ignored __P((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.
*/
bool filec = 0;
static void
setup_tty(on)
int on;
{
#ifdef TERMIOS
static struct termios tchars;
if (on) {
(void) tcgetattr(SHIN, &tchars);
tchars.c_cc[VEOL] = ESC;
if (tchars.c_lflag & ICANON)
on = TCSANOW;
else {
on = TCSAFLUSH;
tchars.c_lflag |= ICANON;
}
(void) tcsetattr(SHIN, on, &tchars);
}
else {
tchars.c_cc[VEOL] = _POSIX_VDISABLE;
(void) tcsetattr(SHIN, TCSANOW, &tchars);
}
#else
struct sgttyb sgtty;
static struct tchars tchars;/* INT, QUIT, XON, XOFF, EOF, BRK */
if (on) {
(void) ioctl(SHIN, TIOCGETC, (ioctl_t) & tchars);
tchars.t_brkc = ESC;
(void) ioctl(SHIN, TIOCSETC, (ioctl_t) & tchars);
/*
* This must be done after every command: if the tty gets into raw or
* cbreak mode the user can't even type 'reset'.
*/
(void) ioctl(SHIN, TIOCGETP, (ioctl_t) & sgtty);
if (sgtty.sg_flags & (RAW | CBREAK)) {
sgtty.sg_flags &= ~(RAW | CBREAK);
(void) ioctl(SHIN, TIOCSETP, (ioctl_t) & sgtty);
}
}
else {
tchars.t_brkc = -1;
(void) ioctl(SHIN, TIOCSETC, (ioctl_t) & tchars);
}
#endif
}
/*
* Move back to beginning of current line
*/
static void
back_to_col_1()
{
#ifdef TERMIOS
struct termios tty, tty_normal;
sigmask_t omask;
omask = sigblock(sigmask(SIGINT));
(void) tcgetattr(SHOUT, &tty);
tty_normal = tty;
tty.c_iflag &= ~INLCR;
tty.c_oflag &= ~ONLCR;
(void) tcsetattr(SHOUT, TCSANOW, &tty);
(void) write(SHOUT, "\r", 1);
(void) tcsetattr(SHOUT, TCSANOW, &tty_normal);
(void) sigsetmask(omask);
#else
struct sgttyb tty, tty_normal;
sigmask_t omask;
omask = sigblock(sigmask(SIGINT));
(void) ioctl(SHIN, TIOCGETP, (ioctl_t) & tty);
tty_normal = tty;
tty.sg_flags &= ~CRMOD;
(void) ioctl(SHIN, TIOCSETN, (ioctl_t) & tty);
(void) write(SHOUT, "\r", 1);
(void) ioctl(SHIN, TIOCSETN, (ioctl_t) & tty_normal);
(void) sigsetmask(omask);
#endif
}
/*
* Push string contents back into tty queue
*/
static void
pushback(string)
Char *string;
{
#ifdef TERMIOS
register Char *p;
struct termios tty, tty_normal;
sigmask_t omask;
char c;
omask = sigblock(sigmask(SIGINT));
(void) tcgetattr(SHOUT, &tty);
tty_normal = tty;
tty.c_lflag &= ~(ECHOKE | ECHO | ECHOE | ECHOK | ECHONL | ECHOPRT | ECHOCTL);
(void) tcsetattr(SHOUT, TCSANOW, &tty);
for (p = string; c = *p; p++)
(void) ioctl(SHOUT, TIOCSTI, (ioctl_t) & c);
(void) tcsetattr(SHOUT, TCSANOW, &tty_normal);
(void) sigsetmask(omask);
#else
register Char *p;
struct sgttyb tty, tty_normal;
sigmask_t omask;
char c;
omask = sigblock(sigmask(SIGINT));
(void) ioctl(SHOUT, TIOCGETP, (ioctl_t) & tty);
tty_normal = tty;
tty.sg_flags &= ~ECHO;
(void) ioctl(SHOUT, TIOCSETN, (ioctl_t) & tty);
for (p = string; c = *p; p++)
(void) ioctl(SHOUT, TIOCSTI, (ioctl_t) & c);
(void) ioctl(SHOUT, TIOCSETN, (ioctl_t) & tty_normal);
(void) sigsetmask(omask);
#endif
}
/*
* Concatenate src onto tail of des.
* Des is a string whose maximum length is count.
* Always null terminate.
*/
static void
catn(des, src, count)
register Char *des, *src;
register 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(des, src, count)
register Char *des, *src;
register count;
{
while (--count >= 0)
if ((*des++ = *src++) == 0)
return;
*des = '\0';
}
static Char
filetype(dir, file)
Char *dir, *file;
{
Char path[MAXPATHLEN];
struct stat statb;
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(dir, items, count)
Char *dir, *items[];
int count;
{
register int i, rows, r, c, maxwidth = 0, columns;
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) {
register int w;
xprintf("%s", short2str(items[i]));
xputchar(dir ? filetype(dir, items[i]) : ' ');
if (c < columns - 1) { /* last column? */
w = Strlen(items[i]) + 1;
for (; w < maxwidth; w++)
xputchar(' ');
}
}
}
xputchar('\r');
xputchar('\n');
}
}
/*
* Expand file name with possible tilde usage
* ~person/mumble
* expands to
* home_directory_of_person/mumble
*/
static Char *
tilde(new, old)
Char *new, *old;
{
register Char *o, *p;
register struct passwd *pw;
static Char person[40];
if (old[0] != '~')
return (Strcpy(new, old));
for (p = person, o = &old[1]; *o && *o != '/'; *p++ = *o++);
*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()
{
#ifdef TERMIOS
struct termios tty;
(void) tcgetattr(SHOUT, &tty);
tty.c_lflag |= PENDIN;
(void) tcsetattr(SHOUT, TCSANOW, &tty);
#else
int pending_input = LPENDIN;
(void) ioctl(SHOUT, TIOCLBIS, (ioctl_t) & pending_input);
#endif
}
static void
beep()
{
if (adrof(STRnobeep) == 0)
(void) write(SHOUT, "\007", 1);
}
/*
* Erase that silly ^[ and
* print the recognized part of the string
*/
static void
print_recog_stuff(recog_part)
Char *recog_part;
{
/* An optimized erasing of that silly ^[ */
putraw('\b');
putraw('\b');
switch (Strlen(recog_part)) {
case 0: /* erase two Characters: ^[ */
putraw(' ');
putraw(' ');
putraw('\b');
putraw('\b');
break;
case 1: /* overstrike the ^, erase the [ */
xprintf("%s", short2str(recog_part));
putraw(' ');
putraw('\b');
break;
default: /* overstrike both Characters ^[ */
xprintf("%s", short2str(recog_part));
break;
}
flush();
}
/*
* 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(path, dir, name)
Char *path, *dir, *name;
{
register 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_fd, look_lognames)
DIR *dir_fd;
int look_lognames;
{
register struct passwd *pw;
register struct dirent *dirp;
if (look_lognames) {
if ((pw = getpwent()) == NULL)
return (NULL);
return (str2short(pw->pw_name));
}
if (dirp = readdir(dir_fd))
return (str2short(dirp->d_name));
return (NULL);
}
static void
free_items(items)
register Char **items;
{
register int i;
for (i = 0; items[i]; i++)
xfree((ptr_t) items[i]);
xfree((ptr_t) items);
}
#define FREE_ITEMS(items) { \
sigmask_t omask;\
\
omask = sigblock(sigmask(SIGINT));\
free_items(items);\
items = NULL;\
(void) sigsetmask(omask);\
}
/*
* Perform a RECOGNIZE or LIST command on string "word".
*/
static int
tsearch(word, command, max_word_length)
Char *word;
int max_word_length;
COMMAND command;
{
static Char **items = NULL;
register DIR *dir_fd;
register numitems = 0, ignoring = TRUE, nignored = 0;
register name_length, look_lognames;
Char tilded_dir[MAXPATHLEN + 1], dir[MAXPATHLEN + 1];
Char name[MAXNAMLEN + 1], extended_name[MAXNAMLEN + 1];
Char *entry;
#define MAXITEMS 1024
if (items != NULL)
FREE_ITEMS(items);
look_lognames = (*word == '~') && (Strchr(word, '/') == NULL);
if (look_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, look_lognames);) {
if (!is_prefix(name, entry))
continue;
/* Don't match . files on null prefix match */
if (name_length == 0 && entry[0] == '.' &&
!look_lognames)
continue;
if (command == LIST) {
if (numitems >= MAXITEMS) {
xprintf("\nYikes!! Too many %s!!\n",
look_lognames ?
"names in password file" : "files");
break;
}
if (items == NULL)
items = (Char **) xcalloc(sizeof(items[0]), 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 (look_lognames)
(void) setpwent();
else
rewinddir(dir_fd);
goto again;
}
if (look_lognames)
(void) endpwent();
else
(void) closedir(dir_fd);
if (numitems == 0)
return (0);
if (command == RECOGNIZE) {
if (look_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]), sortscmp);
print_by_column(look_lognames ? NULL : tilded_dir,
items, numitems);
if (items != NULL)
FREE_ITEMS(items);
}
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(extended_name, entry, name_length, numitems)
Char *extended_name, *entry;
int name_length, numitems;
{
if (numitems == 1) /* 1st match */
copyn(extended_name, entry, MAXNAMLEN);
else { /* 2nd & subsequent matches */
register Char *x, *ent;
register int len = 0;
x = extended_name;
for (ent = entry; *x && *x == *ent++; x++, len++);
*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(check, template)
register Char *check, *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 it's suffix.
*/
static int
is_suffix(check, template)
Char *check, *template;
{
register Char *c, *t;
for (c = check; *c++;);
for (t = template; *t++;);
for (;;) {
if (t == template)
return 1;
if (c == check || *--t != *--c)
return 0;
}
}
int
tenex(in_line, in_li_size)
Char *in_line;
int in_li_size;
{
register int numitems, num_read;
char tin_line[BUFSIZ];
setup_tty(ON);
while ((num_read = read(SHIN, tin_line, BUFSIZ)) > 0) {
int i;
static Char delims[] = {' ', '\'', '"', '\t', ';', '&', '<',
'>', '(', ')', '|', '^', '%', '\0'};
register Char *str_end, *word_start, last_Char, should_retype;
register int space_left;
COMMAND command;
for (i = 0; i < num_read; i++)
in_line[i] = (unsigned char) tin_line[i];
last_Char = in_line[num_read - 1] & ASCII;
if (last_Char == '\n' || num_read == in_li_size)
break;
command = (last_Char == ESC) ? RECOGNIZE : LIST;
if (command == LIST)
xputchar('\n');
str_end = &in_line[num_read];
if (last_Char == ESC)
--str_end; /* wipeout trailing cmd Char */
*str_end = '\0';
/*
* Find LAST occurence of a delimiter in the in_line. The word start
* is one Character past it.
*/
for (word_start = str_end; word_start > in_line; --word_start)
if (Strchr(delims, word_start[-1]))
break;
space_left = in_li_size - (word_start - in_line) - 1;
numitems = tsearch(word_start, command, space_left);
if (command == RECOGNIZE) {
/* print from str_end on */
print_recog_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(in_line, '\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 (should_retype)
printprompt();
pushback(in_line);
if (should_retype)
retype();
}
setup_tty(OFF);
return (num_read);
}
static int
ignored(entry)
register Char *entry;
{
struct varent *vp;
register 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 */