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prompt.c revision 1.1 
      1 /*	$NetBSD: prompt.c,v 1.1 2018/08/24 02:01:06 jmcneill Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996, 1997
      5  * 	Matthias Drochner.  All rights reserved.
      6  * Copyright (c) 1996, 1997
      7  * 	Perry E. Metzger.  All rights reserved.
      8  * Copyright (c) 1997
      9  *	Jason R. Thorpe.  All rights reserved
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgements:
     21  *	This product includes software developed for the NetBSD Project
     22  *	by Matthias Drochner.
     23  *	This product includes software developed for the NetBSD Project
     24  *	by Perry E. Metzger.
     25  * 4. The names of the authors may not be used to endorse or promote products
     26  *    derived from this software without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     29  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     30  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     31  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     32  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     33  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     37  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 #include "efiboot.h"
     41 
     42 #include <lib/libsa/net.h>
     43 
     44 #define	POLL_FREQ	10
     45 
     46 char *
     47 gettrailer(char *arg)
     48 {
     49 	char *options;
     50 
     51 	for (options = arg; *options; options++) {
     52 		switch (*options) {
     53 		case ' ':
     54 		case '\t':
     55 			*options++ = '\0';
     56 			break;
     57 		default:
     58 			continue;
     59 		}
     60 		break;
     61 	}
     62 	if (*options == '\0')
     63 		return options;
     64 
     65 	/* trim leading blanks/tabs */
     66 	while (*options == ' ' || *options == '\t')
     67 		options++;
     68 
     69 	return options;
     70 }
     71 
     72 char
     73 awaitkey(int timeout, int tell)
     74 {
     75 	int i = timeout * POLL_FREQ;
     76 	char c = 0;
     77 
     78 	for (;;) {
     79 		if (tell) {
     80 			char buf[32];
     81 			int len;
     82 
     83 			len = snprintf(buf, sizeof(buf), "%d seconds. ", i / POLL_FREQ);
     84 			if (len > 0 && len < sizeof(buf)) {
     85 				char *p = buf;
     86 				printf("%s", buf);
     87 				while (*p)
     88 					*p++ = '\b';
     89 				printf("%s", buf);
     90 			}
     91 		}
     92 		if (ischar()) {
     93 			while (ischar())
     94 				c = getchar();
     95 			if (c == 0)
     96 				c = -1;
     97 			goto out;
     98 		}
     99 		if (--i > 0) {
    100 			efi_delay(1000000 / POLL_FREQ);
    101 		} else {
    102 			break;
    103 		}
    104 	}
    105 
    106 out:
    107 	if (tell)
    108 		printf("0 seconds.     \n");
    109 
    110 	return c;
    111 }
    112 
    113 void
    114 docommand(char *arg)
    115 {
    116 	char *options;
    117 	int i;
    118 
    119 	options = gettrailer(arg);
    120 
    121 	for (i = 0; commands[i].c_name != NULL; i++) {
    122 		if (strcmp(arg, commands[i].c_name) == 0) {
    123 			(*commands[i].c_fn)(options);
    124 			return;
    125 		}
    126 	}
    127 
    128 	printf("unknown command\n");
    129 	command_help(NULL);
    130 }
    131 
    132 __dead void
    133 bootprompt(void)
    134 {
    135 	char input[80];
    136 
    137 	for (;;) {
    138 		char *c = input;
    139 
    140 		input[0] = '\0';
    141 		printf("> ");
    142 		kgets(input, sizeof(input));
    143 
    144 		/*
    145 		 * Skip leading whitespace.
    146 		 */
    147 		while (*c == ' ')
    148 			c++;
    149 		if (*c)
    150 			docommand(c);
    151 	}
    152 }
    153