util/hexdump: Remove ascii parameter from qemu_hexdump_line

Split out asciidump_line as a separate function, local to hexdump.c,
for use by qemu_hexdump.  Use "%-*s" to generate the alignment
between the hex and the ascii, rather than explicit spaces.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240412073346.458116-3-richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

3 files changed, 32 insertions, 25 deletions

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index f3a86c1a8c..7368b71902 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -949,7 +949,7 @@ static void vhost_vdpa_dump_config(struct vhost_dev *dev, const uint8_t *config,
 
     for (b = 0; b < config_len; b += 16) {
         len = config_len - b;
-        qemu_hexdump_line(line, config + b, len, false);
+        qemu_hexdump_line(line, config + b, len);
         trace_vhost_vdpa_dump_config(dev, b, line);
     }
 }
diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h
index d7715f7a33..c5dea63742 100644
--- a/include/qemu/cutils.h
+++ b/include/qemu/cutils.h
@@ -287,8 +287,7 @@ int parse_debug_env(const char *name, int max, int initial);
  */
 #define QEMU_HEXDUMP_LINE_BYTES 16 /* Number of bytes to dump */
 #define QEMU_HEXDUMP_LINE_LEN 75   /* Number of characters in line */
-void qemu_hexdump_line(char *line, const void *bufptr,
-                       unsigned int len, bool ascii);
+void qemu_hexdump_line(char *line, const void *bufptr, size_t len);
 
 /*
  * Hexdump a buffer to a file. An optional string prefix is added to every line
diff --git a/util/hexdump.c b/util/hexdump.c
index 7324e7b126..0f943e31e5 100644
--- a/util/hexdump.c
+++ b/util/hexdump.c
@@ -16,49 +16,57 @@
 #include "qemu/osdep.h"
 #include "qemu/cutils.h"
 
-void qemu_hexdump_line(char *line, const void *bufptr,
-                       unsigned int len, bool ascii)
+void qemu_hexdump_line(char *line, const void *bufptr, size_t len)
 {
     const char *buf = bufptr;
-    int i, c;
+    int i;
 
     if (len > QEMU_HEXDUMP_LINE_BYTES) {
         len = QEMU_HEXDUMP_LINE_BYTES;
     }
 
-    for (i = 0; i < QEMU_HEXDUMP_LINE_BYTES; i++) {
+    for (i = 0; i < len; i++) {
         if (i != 0 && (i % 4) == 0) {
             *line++ = ' ';
         }
-        if (i < len) {
-            line += sprintf(line, " %02x", (unsigned char)buf[i]);
-        } else {
-            line += sprintf(line, "   ");
-        }
+        line += sprintf(line, " %02x", (unsigned char)buf[i]);
     }
-    if (ascii) {
-        *line++ = ' ';
-        for (i = 0; i < len; i++) {
-            c = buf[i];
-            if (c < ' ' || c > '~') {
-                c = '.';
-            }
-            *line++ = c;
+    *line = '\0';
+}
+
+static void asciidump_line(char *line, const void *bufptr, size_t len)
+{
+    const char *buf = bufptr;
+
+    for (size_t i = 0; i < len; i++) {
+        char c = buf[i];
+
+        if (c < ' ' || c > '~') {
+            c = '.';
         }
+        *line++ = c;
     }
     *line = '\0';
 }
 
+#define QEMU_HEXDUMP_LINE_WIDTH \
+    (QEMU_HEXDUMP_LINE_BYTES * 2 + QEMU_HEXDUMP_LINE_BYTES / 4)
+
 void qemu_hexdump(FILE *fp, const char *prefix,
                   const void *bufptr, size_t size)
 {
-    unsigned int b, len;
     char line[QEMU_HEXDUMP_LINE_LEN];
+    char ascii[QEMU_HEXDUMP_LINE_BYTES + 1];
+    size_t b, len;
+
+    for (b = 0; b < size; b += len) {
+        len = MIN(size - b, QEMU_HEXDUMP_LINE_BYTES);
+
+        qemu_hexdump_line(line, bufptr + b, len);
+        asciidump_line(ascii, bufptr + b, len);
 
-    for (b = 0; b < size; b += QEMU_HEXDUMP_LINE_BYTES) {
-        len = size - b;
-        qemu_hexdump_line(line, bufptr + b, len, true);
-        fprintf(fp, "%s: %04x: %s\n", prefix, b, line);
+        fprintf(fp, "%s: %04zx: %-*s %s\n",
+                prefix, b, QEMU_HEXDUMP_LINE_WIDTH, line, ascii);
     }
 
 }