lpc.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)lpc.c	4.1      ULTRIX 7/2/90";
#endif

/*
 * lpc -- line printer control program
 */

/************************************************************************
 *									*
 *			Copyright (c) 1988 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/* SCCS history beginning
 * ***************************************************************
 *                -- Revision History --
 * ***************************************************************
 * 
 * 1.1  01/11/83 -- sccs
 * date and time created 83/11/01 20:57:23 by sccs
 * 
 * ***************************************************************
 *
 * 1.2 18/07/88 -- thoms
 * Added copyright notice and modification history
 *
 * 1.3  03/05/88 -- thoms
 * Fixed indirection through null pointer bug in help()
 *
 * SCCS history end
 */


#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#include <setjmp.h>

#include "lpc.h"

int	fromatty;

char	cmdline[200];
int	margc;
char	*margv[20];
int	top;
int	intr();
struct	cmd *getcmd();

jmp_buf	toplevel;

main(argc, argv)
	char *argv[];
{
	register struct cmd *c;
	extern char *name;

	name = argv[0];

	if (--argc > 0) {
		c = getcmd(*++argv);
		if (c == (struct cmd *)-1) {
			printf("?Ambiguous command\n");
			exit(1);
		}
		if (c == 0) {
			printf("?Invalid command\n");
			exit(1);
		}
		if (c->c_priv && getuid()) {
			printf("?Privileged command\n");
			exit(1);
		}
		(*c->c_handler)(argc, argv);
		exit(0);
	}
	fromatty = isatty(fileno(stdin));
	top = setjmp(toplevel) == 0;
	if (top)
		signal(SIGINT, intr);
	for (;;) {
		cmdscanner(top);
		top = 1;
	}
}

intr()
{
	if (!fromatty)
		exit(0);
	longjmp(toplevel, 1);
}

/*
 * Command parser.
 */
cmdscanner(top)
	int top;
{
	register struct cmd *c;
	extern struct cmd cmdtab[];
	extern int help();

	if (!top)
		putchar('\n');
	for (;;) {
		if (fromatty) {
			printf("lpc> ");
			fflush(stdout);
		}
		if (gets(cmdline) == 0)
			quit();
		if (cmdline[0] == 0)
			break;
		makeargv();
		c = getcmd(margv[0]);
		if (c == (struct cmd *)-1) {
			printf("?Ambiguous command\n");
			continue;
		}
		if (c == 0) {
			printf("?Invalid command\n");
			continue;
		}
		if (c->c_priv && getuid()) {
			printf("?Privileged command\n");
			continue;
		}
		(*c->c_handler)(margc, margv);
	}
	longjmp(toplevel, 0);
}

struct cmd *
getcmd(name)
	register char *name;
{
	register char *p, *q;
	register struct cmd *c, *found;
	register int nmatches, longest;

	longest = 0;
	nmatches = 0;
	found = 0;
	for (c = cmdtab; p = c->c_name; c++) {
		for (q = name; *q == *p++; q++)
			if (*q == 0)		/* exact match? */
				return(c);
		if (!*q) {			/* the name was a prefix */
			if (q - name > longest) {
				longest = q - name;
				nmatches = 1;
				found = c;
			} else if (q - name == longest)
				nmatches++;
		}
	}
	if (nmatches > 1)
		return((struct cmd *)-1);
	return(found);
}

/*
 * Slice a string up into argc/argv.
 */
makeargv()
{
	register char *cp;
	register char **argp = margv;

	margc = 0;
	for (cp = cmdline; *cp;) {
		while (isspace(*cp))
			cp++;
		if (*cp == '\0')
			break;
		*argp++ = cp;
		margc += 1;
		while (*cp != '\0' && !isspace(*cp))
			cp++;
		if (*cp == '\0')
			break;
		*cp++ = '\0';
	}
	*argp++ = 0;
}

#define HELPINDENT (sizeof ("directory"))


/*
 * Help command.
 */
help(argc, argv)
	int argc;
	char *argv[];
{
	register struct cmd *c;

	if (argc == 1) {
		register int i, j, w;
		int columns, width = 0, lines;
		int ncmds;

		printf("Commands may be abbreviated.  Commands are:\n\n");
		for (c = cmdtab; c->c_name; c++) {
			int len = strlen(c->c_name);

			if (len > width)
				width = len;
		}
		/* We don't use the ncmds in cmdtab.c because its wrong */
		ncmds = c - cmdtab;

		width = (width + 8) &~ 7;
		columns = 80 / width;
		if (columns == 0)
			columns = 1;
		lines = (ncmds + columns - 1) / columns;
		for (i = 0; i < lines; i++) {
			for (j = 0; j < columns; j++) {
				c = cmdtab + j * lines + i;
				printf("%s", c->c_name);
				if (c + lines >= &cmdtab[ncmds]) {
					printf("\n");
					break;
				}
				w = strlen(c->c_name);
				while (w < width) {
					w = (w + 8) &~ 7;
					putchar('\t');
				}
			}
		}
		return;
	}
	while (--argc > 0) {
		register char *arg;
		arg = *++argv;
		c = getcmd(arg);
		if (c == (struct cmd *)-1)
			printf("?Ambiguous help command %s\n", arg);
		else if (c == (struct cmd *)0)
			printf("?Invalid help command %s\n", arg);
		else
			printf("%-*s\t%s\n", HELPINDENT,
				c->c_name, c->c_help);
	}
}