lib: fix %J string formats with precision specifier

Previous refactoring of the code led to an invalid internal format pettern
being used to output the formatted JSON data.

Fixes: 9041e24 ("lib: fix uninitialized memory access on handling %J string formats")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib.c b/lib.c
index 0e77b23..366b958 100644
--- a/lib.c
+++ b/lib.c
@@ -1324,8 +1324,9 @@ uc_printf_common(uc_vm_t *vm, size_t nargs, uc_stringbuf_t *buf)
 					if (sfmt[i] == '.') {
 						for (pad_size = 0, i++; sfmt + i < fp && isdigit(sfmt[i]); i++)
 							pad_size = pad_size * 10 + (sfmt[i] - '0');
+
 						pad_size++;
-						fp = &sfmt[i-1];
+						fp = strchr(sfmt, '.');
 						break;
 					}
 				}