From e2e9582916f44319a861afe6338da518aa66fd36 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Fri, 30 Nov 2018 09:22:02 +0100
Subject: memory_display: Print whole line at once

Instead of using many printf assemble a printed line first and
print it at once. This has the purpose of being able to pick
different output functions in the next step.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 common/memory_display.c | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/common/memory_display.c b/common/memory_display.c
index 30821cced4..03d418b33b 100644
--- a/common/memory_display.c
+++ b/common/memory_display.c
@@ -8,6 +8,7 @@ int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int
 {
 	unsigned long linebytes, i;
 	unsigned char *cp;
+	unsigned char line[sizeof("00000000: 0000 0000 0000 0000  0000 0000 0000 0000            ................")];
 
 	/* Print the lines.
 	 *
@@ -20,9 +21,9 @@ int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int
 		uint32_t *uip = (uint32_t *)linebuf;
 		uint16_t *usp = (uint16_t *)linebuf;
 		uint8_t *ucp = (uint8_t *)linebuf;
-		unsigned count = 52;
+		unsigned char *pos = line;
 
-		printf("%08llx:", offs);
+		pos += sprintf(pos, "%08llx:", offs);
 		linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
 
 		for (i = 0; i < linebytes; i += size) {
@@ -34,9 +35,9 @@ int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int
 					res = __swab64(res);
 				if (data_abort_unmask()) {
 					res = 0xffffffffffffffffULL;
-					count -= printf(" xxxxxxxxxxxxxxxx");
+					pos += sprintf(pos, " xxxxxxxxxxxxxxxx");
 				} else {
-					count -= printf(" %016llx", res);
+					pos += sprintf(pos, " %016llx", res);
 				}
 				*ullp++ = res;
 			} else if (size == 4) {
@@ -47,9 +48,9 @@ int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int
 					res = __swab32(res);
 				if (data_abort_unmask()) {
 					res = 0xffffffff;
-					count -= printf(" xxxxxxxx");
+					pos += sprintf(pos, " xxxxxxxx");
 				} else {
-					count -= printf(" %08x", res);
+					pos += sprintf(pos, " %08x", res);
 				}
 				*uip++ = res;
 			} else if (size == 2) {
@@ -59,12 +60,12 @@ int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int
 				if (swab)
 					res = __swab16(res);
 				if (i > 1 && i % 8 == 0)
-					count -= printf(" ");
+					pos += sprintf(pos, " ");
 				if (data_abort_unmask()) {
 					res = 0xffff;
-					count -= printf(" xxxx");
+					pos += sprintf(pos, " xxxx");
 				} else {
-					count -= printf(" %04x", res);
+					pos += sprintf(pos, " %04x", res);
 				}
 				*usp++ = res;
 			} else {
@@ -72,12 +73,12 @@ int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int
 				data_abort_mask();
 				res = *((uint8_t *)addr);
 				if (i > 1 && i % 8 == 0)
-					count -= printf(" ");
+					pos += sprintf(pos, " ");
 				if (data_abort_unmask()) {
 					res = 0xff;
-					count -= printf(" xx");
+					pos += sprintf(pos, " xx");
 				} else {
-					count -= printf(" %02x", res);
+					pos += sprintf(pos, " %02x", res);
 				}
 				*ucp++ = res;
 			}
@@ -85,19 +86,19 @@ int memory_display(const void *addr, loff_t offs, unsigned nbytes, int size, int
 			offs += size;
 		}
 
-		while (count--)
-			putchar(' ');
+		pos += sprintf(pos, "%*s", 61 - (pos - line), "");
 
 		cp = linebuf;
 		for (i = 0; i < linebytes; i++) {
 			if ((*cp < 0x20) || (*cp > 0x7e))
-				putchar('.');
+				sprintf(pos, ".");
 			else
-				printf("%c", *cp);
+				sprintf(pos, "%c", *cp);
+			pos++;
 			cp++;
 		}
 
-		putchar('\n');
+		printf("%s\n", line);
 		nbytes -= linebytes;
 		if (ctrlc())
 			return -EINTR;
-- 
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