file.c

早期freebsd实现

/*-
 * 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. 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.
 */

#ifndef lint
static char sccsid[] = "@(#)file.c	8.2 (Berkeley) 3/19/94";
#endif /* not lint */

#ifdef FILEC

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <termios.h>
#include <dirent.h>
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef SHORT_STRINGS
#include <string.h>
#endif /* SHORT_STRINGS */
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif

#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 __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_recognized_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;
{
    static struct termios tchars;

    (void) tcgetattr(SHIN, &tchars);

    if (on) {
	tchars.c_cc[VEOL] = ESC;
	if (tchars.c_lflag & ICANON)
	    on = TCSANOW;
	else {
	    on = TCSAFLUSH;
	    tchars.c_lflag |= ICANON;
	}
    }
    else {
	tchars.c_cc[VEOL] = _POSIX_VDISABLE;
	on = TCSANOW;
    }

    (void) tcsetattr(SHIN, TCSANOW, &tchars);
}

/*
 * Move back to beginning of current line
 */
static void
back_to_col_1()
{
    struct termios tty, tty_normal;
    int     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);
}

/*
 * Push string contents back into tty queue
 */
static void
pushback(string)
    Char   *string;
{
    register Char *p;
    struct termios tty, tty_normal;
    int     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) != '\0'; p++)
	(void) ioctl(SHOUT, TIOCSTI, (ioctl_t) & c);
    (void) tcsetattr(SHOUT, TCSANOW, &tty_normal);
    (void) sigsetmask(omask);
}

/*
 * 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 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(des, src, count)
    register Char *des, *src;
    register int 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;

		(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(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++)
	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()
{
    struct termios tty;

    (void) tcgetattr(SHOUT, &tty);
    tty.c_lflag |= PENDIN;
    (void) tcsetattr(SHOUT, TCSANOW, &tty);
}

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_recognized_stuff(recognized_part)
    Char   *recognized_part;
{
    /* An optimized erasing of that silly ^[ */