console_x.c@ 566

Last change on this file since 566 was 1, checked in by vboxsync, 55 years ago
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Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 1.7 KB

Line
1
2	#include "etherboot.h"
3
4	#include <lib.h>
5
6	int getline(char *buf, int max)
7	{
8	int cur, ch, nonspace_seen;
9
10	cur = 0;
11	while (buf[cur]) {
12	putchar(buf[cur]);
13	cur++;
14	}
15	for (;;) {
16	ch = getchar();
17	switch (ch) {
18	/* end of line */
19	case '\r':
20	case '\n':
21	putchar('\n');
22	goto out;
23	/* backspace */
24	case '\b':
25	case '\x7f':
26	if (cur > 0) {
27	cur--;
28	putchar('\b');
29	putchar(' ');
30	putchar('\b');
31	}
32	break;
33	/* word erase */
34	case 'W' & 0x1f: /* ^W */
35	nonspace_seen = 0;
36	while (cur) {
37	if (buf[cur-1] != ' ')
38	nonspace_seen = 1;
39	putchar('\b');
40	putchar(' ');
41	putchar('\b');
42	cur--;
43	if (nonspace_seen && cur < max-1 && cur > 0 && buf[cur-1]==' ')
44	break;
45	}
46	break;
47	/* line erase */
48	case 'U' & 0x1f: /* ^U */
49	while (cur) {
50	putchar('\b');
51	putchar(' ');
52	putchar('\b');
53	cur--;
54	}
55	cur = 0;
56	break;
57	default:
58	if (ch < 0x20)
59	break; /* ignore control char */
60	if (ch >= 0x7f)
61	break;
62	if (cur + 1 < max) {
63	putchar(ch); /* echo back */
64	buf[cur] = ch;
65	cur++;
66	}
67	}
68	}
69	out:
70	if (cur >= max)
71	cur = max - 1;
72	buf[cur] = '\0';
73	return cur;
74	}

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