summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/xmon/nonstdio.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/xmon/nonstdio.c')
-rw-r--r--arch/powerpc/xmon/nonstdio.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/nonstdio.c b/arch/powerpc/xmon/nonstdio.c
new file mode 100644
index 0000000000..9b0d85bff0
--- /dev/null
+++ b/arch/powerpc/xmon/nonstdio.c
@@ -0,0 +1,188 @@
+// 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));
+}