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      1 /*	$NetBSD: cmds.c,v 1.30 2016/10/22 22:02:55 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1980, 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)cmds.c	8.2 (Berkeley) 4/29/95";
     36 #endif
     37 __RCSID("$NetBSD: cmds.c,v 1.30 2016/10/22 22:02:55 christos Exp $");
     38 #endif /* not lint */
     39 
     40 #include <ctype.h>
     41 #include <signal.h>
     42 #include <string.h>
     43 #include <unistd.h>
     44 
     45 #include "systat.h"
     46 #include "extern.h"
     47 
     48 void	switch_mode(struct mode *p);
     49 
     50 void
     51 command(char *cmd)
     52 {
     53 	struct command *c;
     54 	struct mode *p;
     55 	char *args;
     56 
     57 	if (cmd[0] == '\0')
     58 		return;
     59 
     60 	args = cmd;
     61 	cmd = strsep(&args, " \t");
     62 
     63 	if (curmode->c_commands) {
     64 		for (c = curmode->c_commands; c->c_name; c++) {
     65 			if (strstr(c->c_name, cmd) == c->c_name) {
     66 				(c->c_cmd)(args);
     67 				goto done;
     68 			}
     69 		}
     70 	}
     71 
     72 	for (c = global_commands; c->c_name; c++) {
     73 		if (strstr(c->c_name, cmd) == c->c_name) {
     74 			(c->c_cmd)(args);
     75 			goto done;
     76 		}
     77 	}
     78 
     79 	for (p = modes; p->c_name; p++) {
     80 		if (strstr(p->c_name, cmd) == p->c_name) {
     81 			switch_mode(p);
     82 			goto done;
     83 		}
     84 	}
     85 
     86 	if (isdigit((unsigned char)cmd[0])) {
     87 		global_interval(cmd);
     88 		goto done;
     89 	}
     90 
     91 	error("%s: Unknown command.", cmd);
     92 done:
     93 	;
     94 }
     95 
     96 void
     97 switch_mode(struct mode *p)
     98 {
     99 	int switchfail;
    100 	struct mode *r;
    101 
    102 	switchfail = 0;
    103 	r = p;
    104 
    105 	if (curmode == p) {
    106 		status();
    107 		return;
    108 	}
    109 
    110 	alarm(0);
    111 	(*curmode->c_close)(wnd);
    112 	wnd = (*p->c_open)();
    113 	if (wnd == 0) {
    114 		wnd = (*curmode->c_open)();
    115 		if (wnd == 0) {
    116 			error("Couldn't change back to previous mode");
    117 			die(0);
    118 		}
    119 
    120 		p = curmode;
    121 		switchfail++;
    122 	}
    123 
    124 	if ((p->c_flags & CF_INIT) == 0) {
    125 		if ((*p->c_init)())
    126 			p->c_flags |= CF_INIT;
    127 		else {
    128 			(*p->c_close)(wnd);
    129 			wnd = (*curmode->c_open)();
    130 			p = curmode;
    131 			switchfail++;
    132 		}
    133 	}
    134 
    135 	curmode = p;
    136 	labels();
    137 	display(0);
    138 	if (switchfail && !allflag)
    139 		error("Couldn't switch mode, back to %s", curmode->c_name);
    140 	else {
    141 		if (switchfail && allflag) {
    142 			r++;
    143 			switch_mode(r);
    144 		} else {
    145 			status();
    146 		}
    147 	}
    148 }
    149 
    150 void
    151 status(void)
    152 {
    153 	error("Showing %s, refresh every %g seconds.", curmode->c_name, naptime);
    154 }
    155 
    156 int
    157 prefix(const char *s1, const char *s2)
    158 {
    159 
    160 	while (*s1 == *s2) {
    161 		if (*s1 == '\0')
    162 			return (1);
    163 		s1++, s2++;
    164 	}
    165 	return (*s1 == '\0');
    166 }
    167