Rather than assembling our output piecemeal lets use the same approach
as the plugin disas interface to build the disassembly string before
printing it.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220929114231.583801-34-alex.bennee@linaro.org>

diff --git a/disas.c b/disas.c
index e31438f349..f07b6e760b 100644
--- a/disas.c
+++ b/disas.c
@@ -239,7 +239,7 @@ void target_disas(FILE *out, CPUState *cpu, target_ulong code,
     }
 }
 
-static int plugin_printf(FILE *stream, const char *fmt, ...)
+static int gstring_printf(FILE *stream, const char *fmt, ...)
 {
     /* We abuse the FILE parameter to pass a GString. */
     GString *s = (GString *)stream;
@@ -270,7 +270,7 @@ char *plugin_disas(CPUState *cpu, uint64_t addr, size_t size)
     GString *ds = g_string_new(NULL);
 
     initialize_debug_target(&s, cpu);
-    s.info.fprintf_func = plugin_printf;
+    s.info.fprintf_func = gstring_printf;
     s.info.stream = (FILE *)ds;  /* abuse this slot */
     s.info.buffer_vma = addr;
     s.info.buffer_length = size;
@@ -358,15 +358,19 @@ void monitor_disas(Monitor *mon, CPUState *cpu,
 {
     int count, i;
     CPUDebug s;
+    g_autoptr(GString) ds = g_string_new("");
 
     initialize_debug_target(&s, cpu);
-    s.info.fprintf_func = qemu_fprintf;
+    s.info.fprintf_func = gstring_printf;
+    s.info.stream = (FILE *)ds;  /* abuse this slot */
+
     if (is_physical) {
         s.info.read_memory_func = physical_read_memory;
     }
     s.info.buffer_vma = pc;
 
     if (s.info.cap_arch >= 0 && cap_disas_monitor(&s.info, pc, nb_insn)) {
+        monitor_puts(mon, ds->str);
         return;
     }
 
@@ -376,13 +380,16 @@ void monitor_disas(Monitor *mon, CPUState *cpu,
         return;
     }
 
-    for(i = 0; i < nb_insn; i++) {
-	monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);
+    for (i = 0; i < nb_insn; i++) {
+        g_string_append_printf(ds, "0x" TARGET_FMT_lx ":  ", pc);
         count = s.info.print_insn(pc, &s.info);
-	monitor_printf(mon, "\n");
-	if (count < 0)
-	    break;
+        g_string_append_c(ds, '\n');
+        if (count < 0) {
+            break;
+        }
         pc += count;
     }
+
+    monitor_puts(mon, ds->str);
 }
 #endif
-- 
2.34.1