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A better fix for the ddb command history buffer problem; use a static

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buffer instead of trying to use malloc() in the input routine.
Submitted by:	john hood <cgull@smoke.marlboro.vt.us>
This commit is contained in:
msmith 1997-11-09 06:30:29 +00:00
parent eae0088b91
commit 67ba7220fd
1 changed files with 9 additions and 9 deletions
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18
sys/ddb/db_input.c
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@ -23,7 +23,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: db_input.c,v 1.19 1997/08/17 21:21:50 joerg Exp $
* $Id: db_input.c,v 1.20 1997/11/07 02:34:50 msmith Exp $
*/
/*
@ -58,8 +58,9 @@ static char * db_le; /* one past last character */
* Simple input line history support.
*/
static char * db_lhistory;
static char db_lhistory_buffer[2048];
static int db_lhistlsize, db_lhistidx, db_lhistcur;
#define DB_LHIST_NLINES 10
static int db_lhist_nlines;
#define CTRL(c) ((c) & 0x1f)
#define isspace(c) ((c) == ' ' || (c) == '\t')
@ -312,15 +313,14 @@ db_readline(lstart, lsize)
{
if (db_lhistory && lsize != db_lhistlsize) {
/* Should not happen, but to be sane, throw history away. */
FREE(db_lhistory, M_TEMP);
db_lhistory = 0;
db_lhistory = NULL;
}
if (db_lhistory == 0) {
if (db_lhistory == NULL) {
/* Initialize input line history. */
db_lhistory = db_lhistory_buffer;
db_lhist_nlines = (sizeof db_lhistory_buffer) / lsize;
db_lhistlsize = lsize;
db_lhistidx = -1;
MALLOC(db_lhistory, char *, lsize * DB_LHIST_NLINES,
M_TEMP, M_NOWAIT);
}
db_lhistcur = db_lhistidx;
@ -339,10 +339,10 @@ db_readline(lstart, lsize)
if (db_lhistory && (db_le - db_lbuf_start > 1)) {
/* Maintain input line history for non-empty lines. */
if (++db_lhistidx == DB_LHIST_NLINES) {
if (++db_lhistidx == db_lhist_nlines) {
/* Rotate history. */
ovbcopy(db_lhistory + db_lhistlsize, db_lhistory,
db_lhistlsize * (DB_LHIST_NLINES - 1));
db_lhistlsize * (db_lhist_nlines - 1));
db_lhistidx--;
}
bcopy(lstart, db_lhistory + (db_lhistidx * db_lhistlsize),