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[ruamoko] Handle 0-length @va_list for va_copy 

Fixes a progs crash when using vsprintf with no format elements +
params.
This commit is contained in:
Bill Currie 2020-06-28 18:48:38 +09:00
parent 7f96b0fbed
commit 6d4e370a25
1 changed files with 7 additions and 2 deletions
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9
libs/ruamoko/rua_runtime.c
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@ -56,8 +56,13 @@ bi_va_copy (progs_t *pr)
__auto_type src_list = &G_STRUCT (pr, pr_type_t, src_args->list);
size_t parm_size = pr->pr_param_size * sizeof(pr_type_t);
size_t size = src_args->count * parm_size;
string_t dst_list_block = PR_AllocTempBlock (pr, size);
__auto_type dst_list = (pr_type_t *) PR_GetString (pr, dst_list_block);
string_t dst_list_block = 0;
pr_type_t *dst_list = 0;
if (size) {
dst_list_block = PR_AllocTempBlock (pr, size);
dst_list = (pr_type_t *) PR_GetString (pr, dst_list_block);
}
memcpy (dst_list, src_list, size);
R_PACKED (pr, pr_va_list_t).count = src_args->count;