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PR/4504: Tero Kivinen: Add DB_HISTORY_SIZE option to enable history in ddb

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This commit is contained in:
christos 1997-11-16 22:24:47 +00:00
parent fd7ea84f27
commit 98ec14c8e6
1 changed files with 131 additions and 1 deletions
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132
sys/ddb/db_input.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_input.c,v 1.7 1996/02/05 01:57:02 christos Exp $ */
/* $NetBSD: db_input.c,v 1.8 1997/11/16 22:24:47 christos Exp $ */
/*
* Mach Operating System
@ -41,6 +41,10 @@
#include <dev/cons.h>
#ifndef DB_HISTORY_SIZE
#define DB_HISTORY_SIZE 0
#endif /* DB_HISTORY_SIZE */
/*
* Character input and editing.
*/
@ -54,6 +58,14 @@ char * db_lbuf_start; /* start of input line buffer */
char * db_lbuf_end; /* end of input line buffer */
char * db_lc; /* current character */
char * db_le; /* one past last character */
#if DB_HISTORY_SIZE != 0
char db_history[DB_HISTORY_SIZE]; /* start of history buffer */
int db_history_size = DB_HISTORY_SIZE;/* size of history buffer */
char * db_history_curr = db_history; /* start of current line */
char * db_history_last = db_history; /* start of last line */
char * db_history_prev = (char *) 0; /* start of previous line */
#endif
#define CTRL(c) ((c) & 0x1f)
#define isspace(c) ((c) == ' ' || (c) == '\t')
@ -105,6 +117,31 @@ db_delete(n, bwd)
db_le -= n;
}
void
db_delete_line()
{
db_delete(db_le - db_lc, DEL_FWD);
db_delete(db_lc - db_lbuf_start, DEL_BWD);
db_le = db_lc = db_lbuf_start;
}
#if DB_HISTORY_SIZE != 0
#define INC_DB_CURR() \
do { \
db_history_curr++; \
if (db_history_curr > \
db_history + db_history_size - 1) \
db_history_curr = db_history; \
} while (0)
#define DEC_DB_CURR() \
do { \
db_history_curr--; \
if (db_history_curr < db_history) \
db_history_curr = db_history + \
db_history_size - 1; \
} while (0)
#endif
/* returns TRUE at end-of-line */
int
db_inputchar(c)
@ -155,6 +192,10 @@ db_inputchar(c)
if (db_lc < db_le)
db_delete(db_le - db_lc, DEL_FWD);
break;
case CTRL('u'):
/* delete line */
db_delete_line();
break;
case CTRL('t'):
/* twiddle last 2 characters */
if (db_lc >= db_lbuf_start + 2) {
@ -167,6 +208,57 @@ db_inputchar(c)
cnputc(db_lc[-1]);
}
break;
#if DB_HISTORY_SIZE != 0
case CTRL('p'):
DEC_DB_CURR();
while (db_history_curr != db_history_last) {
DEC_DB_CURR();
if (*db_history_curr == '\0')
break;
}
db_delete_line();
if (db_history_curr == db_history_last) {
INC_DB_CURR();
db_le = db_lc = db_lbuf_start;
} else {
register char *p;
INC_DB_CURR();
for (p = db_history_curr, db_le = db_lbuf_start;
*p; ) {
*db_le++ = *p++;
if (p == db_history + db_history_size) {
p = db_history;
}
}
db_lc = db_le;
}
db_putstring(db_lbuf_start, db_le - db_lbuf_start);
break;
case CTRL('n'):
while (db_history_curr != db_history_last) {
if (*db_history_curr == '\0')
break;
INC_DB_CURR();
}
if (db_history_curr != db_history_last) {
INC_DB_CURR();
db_delete_line();
if (db_history_curr != db_history_last) {
register char *p;
for (p = db_history_curr,
db_le = db_lbuf_start; *p;) {
*db_le++ = *p++;
if (p == db_history +
db_history_size) {
p = db_history;
}
}
db_lc = db_le;
}
db_putstring(db_lbuf_start, db_le - db_lbuf_start);
}
break;
#endif
case CTRL('r'):
db_putstring("^R\n", 3);
if (db_le > db_lbuf_start) {
@ -176,6 +268,44 @@ db_inputchar(c)
break;
case '\n':
case '\r':
#if DB_HISTORY_SIZE != 0
/* Check if it same than previous line */
if (db_history_curr == db_history_prev) {
register char *pp, *pc;
/* Is it unmodified */
for (pp = db_history_prev, pc = db_lbuf_start;
pc != db_le && *pp; pp++, pc++) {
if (*pp != *pc)
break;
if (++pp == db_history + db_history_size) {
pp = db_history;
}
if (++pc == db_history + db_history_size) {
pc = db_history;
}
}
if (!*pp && pc == db_le) {
/* Repeted previous line, not saved */
db_history_curr = db_history_last;
*db_le++ = c;
return (TRUE);
}
}
if (db_le != db_lbuf_start) {
register char *p;
db_history_prev = db_history_last;
for (p = db_lbuf_start; p != db_le; p++) {
*db_history_last++ = *p;
if (db_history_last == db_history +
db_history_size) {
db_history_last = db_history;
}
}
*db_history_last++ = '\0';
}
db_history_curr = db_history_last;
#endif
*db_le++ = c;
return (1);
default: