[PATCH 1/2] vm: introduce vm_string_to_cstr() which creates a C string from java.lang.String object

[Tomek Grabiec]

Signed-off-by: Tomek Grabiec <tgrab...@gmail.com>
---
 include/vm/object.h |    1 +
 vm/object.c         |   44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/include/vm/object.h b/include/vm/object.h
index 375b6ba..26d5e31 100644
--- a/include/vm/object.h
+++ b/include/vm/object.h
@@ -44,5 +44,6 @@ void array_store_check(struct vm_object *arrayref, struct 
vm_object *obj);
 void array_store_check_vmtype(struct vm_object *arrayref, enum vm_type 
vm_type);
 void array_size_check(int size);
 void multiarray_size_check(int n, ...);
+char *vm_string_to_cstr(struct vm_object *string);
 
 #endif
diff --git a/vm/object.c b/vm/object.c
index e0e35ff..70d6252 100644
--- a/vm/object.c
+++ b/vm/object.c
@@ -2,6 +2,7 @@
 #include <errno.h>
 #include <stdbool.h>
 #include <stdlib.h>
+#include <ctype.h>
 
 #include <jit/exception.h>
 
@@ -382,3 +383,46 @@ void multiarray_size_check(int n, ...)
        va_end(ap);
        return;
 }
+
+char *vm_string_to_cstr(struct vm_object *string_obj)
+{
+       struct vm_object *array_object;
+       struct string *str;
+       int16_t *array;
+       int32_t offset;
+       int32_t count;
+       char *result;
+
+       offset = *(int32_t *)
+               &string_obj->fields[vm_java_lang_String_offset->offset];
+       count = *(int32_t *)
+               &string_obj->fields[vm_java_lang_String_count->offset];
+       array_object = *(struct vm_object **)
+               &string_obj->fields[vm_java_lang_String_value->offset];
+       array = (int16_t *) array_object->fields;
+
+       str = alloc_str();
+       if (!str)
+               return NULL;
+
+       result = NULL;
+
+       for (int32_t i = 0; i < count; ++i) {
+               int16_t ch = array[offset + i];
+               int err;
+
+               if (ch < 128 && isprint(ch))
+                       err = str_append(str, "%c", ch);
+               else
+                       err = str_append(str, "<%d>", ch);
+
+               if (err)
+                       goto exit;
+       }
+
+       result = strdup(str->value);
+
+ exit:
+       free_str(str);
+       return result;
+}
-- 
1.6.0.6


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