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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 1996-2005 Paul Mackerras.
*/
#include <linux/string.h>
#include <asm/udbg.h>
#include <asm/time.h>
#include "nonstdio.h"
static bool paginating, paginate_skipping;
static unsigned long paginate_lpp; /* Lines Per Page */
static unsigned long paginate_pos;
void xmon_start_pagination(void)
{
paginating = true;
paginate_skipping = false;
paginate_pos = 0;
}
void xmon_end_pagination(void)
{
paginating = false;
}
void xmon_set_pagination_lpp(unsigned long lpp)
{
paginate_lpp = lpp;
}
static int xmon_readchar(void)
{
if (udbg_getc)
return udbg_getc();
return -1;
}
static int xmon_write(const char *ptr, int nb)
{
int rv = 0;
const char *p = ptr, *q;
const char msg[] = "[Hit a key (a:all, q:truncate, any:next page)]";
if (nb <= 0)
return rv;
if (paginating && paginate_skipping)
return nb;
if (paginate_lpp) {
while (paginating && (q = strchr(p, '\n'))) {
rv += udbg_write(p, q - p + 1);
p = q + 1;
paginate_pos++;
if (paginate_pos >= paginate_lpp) {
udbg_write(msg, strlen(msg));
switch (xmon_readchar()) {
case 'a':
paginating = false;
break;
case 'q':
paginate_skipping = true;
break;
default:
/* nothing */
break;
}
paginate_pos = 0;
udbg_write("\r\n", 2);
if (paginate_skipping)
return nb;
}
}
}
return rv + udbg_write(p, nb - (p - ptr));
}
int xmon_putchar(int c)
{
char ch = c;
if (c == '\n')
xmon_putchar('\r');
return xmon_write(&ch, 1) == 1? c: -1;
}
static char line[256];
static char *lineptr;
static int lineleft;
static int xmon_getchar(void)
{
int c;
if (lineleft == 0) {
lineptr = line;
for (;;) {
c = xmon_readchar();
if (c == -1 || c == 4)
break;
if (c == '\r' || c == '\n') {
*lineptr++ = '\n';
xmon_putchar('\n');
break;
}
switch (c) {
case 0177:
case '\b':
if (lineptr > line) {
xmon_putchar('\b');
xmon_putchar(' ');
xmon_putchar('\b');
--lineptr;
}
break;
case 'U' & 0x1F:
while (lineptr > line) {
xmon_putchar('\b');
xmon_putchar(' ');
xmon_putchar('\b');
--lineptr;
}
break;
default:
if (lineptr >= &line[sizeof(line) - 1])
xmon_putchar('\a');
else {
xmon_putchar(c);
*lineptr++ = c;
}
}
}
lineleft = lineptr - line;
lineptr = line;
}
if (lineleft == 0)
return -1;
--lineleft;
return *lineptr++;
}
char *xmon_gets(char *str, int nb)
{
char *p;
int c;
for (p = str; p < str + nb - 1; ) {
c = xmon_getchar();
if (c == -1) {
if (p == str)
return NULL;
break;
}
*p++ = c;
if (c == '\n')
break;
}
*p = 0;
return str;
}
void xmon_printf(const char *format, ...)
{
va_list args;
static char xmon_outbuf[1024];
int rc, n;
va_start(args, format);
n = vsnprintf(xmon_outbuf, sizeof(xmon_outbuf), format, args);
va_end(args);
rc = xmon_write(xmon_outbuf, n);
if (n && rc == 0) {
/* No udbg hooks, fallback to printk() - dangerous */
pr_cont("%s", xmon_outbuf);
}
}
void xmon_puts(const char *str)
{
xmon_write(str, strlen(str));
}
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