[PATCH 2/9] disas/capstone: Allow for cap_insn_unit > length

cap_insn_unit is designed for targets like arm thumb2
and s390x where 4 and 6-byte insns are displayed in
2-byte chunks.

For riscv, we prefer 4-byte insns to display as one
4-byte unit, rather than 2x 2-byte units.  So we will
want to set cap_insn_unit to 4, but allow for insns
that are smaller than 4.  Emit padding to match.

Signed-off-by: Richard Henderson <[email protected]>
---
 disas/capstone.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/disas/capstone.c b/disas/capstone.c
index fe3efb0d3c..8fb8d0724c 100644
--- a/disas/capstone.c
+++ b/disas/capstone.c
@@ -107,8 +107,9 @@ static void cap_dump_insn_units(disassemble_info *info, cs_insn *insn,
 {
     fprintf_function print = info->fprintf_func;
     FILE *stream = info->stream;
+    int unit = MIN(info->cap_insn_unit, n - i);
 
-    switch (info->cap_insn_unit) {
+    switch (unit) {
     case 4:
         if (info->endian == BFD_ENDIAN_BIG) {
             for (; i < n; i += 4) {
@@ -140,6 +141,11 @@ static void cap_dump_insn_units(disassemble_info *info, cs_insn *insn,
         }
         break;
     }
+
+    if (unit < info->cap_insn_unit) {
+        int width = (info->cap_insn_unit - unit) * 2;
+        print(stream, "%*s", width, "");
+    }
 }
 
 static void cap_dump_insn(disassemble_info *info, cs_insn *insn)
-- 
2.43.0