PyAPI: add utility functions get the size from an evaluated string

Allows including null bytes in the resulting string.

4 files changed, 41 insertions, 7 deletions

diff --git a/source/blender/python/BPY_extern.h b/source/blender/python/BPY_extern.h
index 11c06f6191e..be2fd6c4e53 100644
--- a/source/blender/python/BPY_extern.h
+++ b/source/blender/python/BPY_extern.h
@@ -85,6 +85,12 @@ bool BPY_execute_string_as_intptr(struct bContext *C,
                                   const char *expr,
                                   const bool verbose,
                                   intptr_t *r_value);
+bool BPY_execute_string_as_string_and_size(struct bContext *C,
+                                           const char *imports[],
+                                           const char *expr,
+                                           const bool verbose,
+                                           char **r_value,
+                                           size_t *r_value_size);
 bool BPY_execute_string_as_string(struct bContext *C,
                                   const char *imports[],
                                   const char *expr,
diff --git a/source/blender/python/generic/py_capi_utils.c b/source/blender/python/generic/py_capi_utils.c
index 8470d1ccdf3..8ea627589f2 100644
--- a/source/blender/python/generic/py_capi_utils.c
+++ b/source/blender/python/generic/py_capi_utils.c
@@ -1257,10 +1257,11 @@ bool PyC_RunString_AsIntPtr(const char *imports[],
   return ok;
 }
 
-bool PyC_RunString_AsString(const char *imports[],
-                            const char *expr,
-                            const char *filename,
-                            char **r_value)
+bool PyC_RunString_AsStringAndSize(const char *imports[],
+                                   const char *expr,
+                                   const char *filename,
+                                   char **r_value,
+                                   size_t *r_value_size)
 {
   PyObject *py_dict, *retval;
   bool ok = true;
@@ -1288,6 +1289,7 @@ bool PyC_RunString_AsString(const char *imports[],
       char *val_alloc = MEM_mallocN(val_len + 1, __func__);
       memcpy(val_alloc, val, val_len + 1);
       *r_value = val_alloc;
+      *r_value_size = val_len;
     }
 
     Py_DECREF(retval);
@@ -1298,6 +1300,15 @@ bool PyC_RunString_AsString(const char *imports[],
   return ok;
 }
 
+bool PyC_RunString_AsString(const char *imports[],
+                            const char *expr,
+                            const char *filename,
+                            char **r_value)
+{
+  size_t value_size;
+  return PyC_RunString_AsStringAndSize(imports, expr, filename, r_value, &value_size);
+}
+
 #endif /* #ifndef MATH_STANDALONE */
 
 /* -------------------------------------------------------------------- */
diff --git a/source/blender/python/generic/py_capi_utils.h b/source/blender/python/generic/py_capi_utils.h
index 5be44ad1af6..5fb5737e1f9 100644
--- a/source/blender/python/generic/py_capi_utils.h
+++ b/source/blender/python/generic/py_capi_utils.h
@@ -119,6 +119,11 @@ bool PyC_RunString_AsIntPtr(const char **imports,
                             const char *expr,
                             const char *filename,
                             intptr_t *r_value);
+bool PyC_RunString_AsStringAndSize(const char **imports,
+                                   const char *expr,
+                                   const char *filename,
+                                   char **r_value,
+                                   size_t *r_value_size);
 bool PyC_RunString_AsString(const char **imports,
                             const char *expr,
                             const char *filename,
diff --git a/source/blender/python/intern/bpy_interface.c b/source/blender/python/intern/bpy_interface.c
index a69ce068aec..2b9556e998a 100644
--- a/source/blender/python/intern/bpy_interface.c
+++ b/source/blender/python/intern/bpy_interface.c
@@ -618,8 +618,12 @@ bool BPY_execute_string_as_number(
 /**
  * \return success
  */
-bool BPY_execute_string_as_string(
-    bContext *C, const char *imports[], const char *expr, const bool verbose, char **r_value)
+bool BPY_execute_string_as_string_and_size(bContext *C,
+                                           const char *imports[],
+                                           const char *expr,
+                                           const bool verbose,
+                                           char **r_value,
+                                           size_t *r_value_size)
 {
   BLI_assert(r_value && expr);
   PyGILState_STATE gilstate;
@@ -632,7 +636,7 @@ bool BPY_execute_string_as_string(
 
   bpy_context_set(C, &gilstate);
 
-  ok = PyC_RunString_AsString(imports, expr, "<expr as str>", r_value);
+  ok = PyC_RunString_AsStringAndSize(imports, expr, "<expr as str>", r_value, r_value_size);
 
   if (ok == false) {
     if (verbose) {
@@ -648,6 +652,14 @@ bool BPY_execute_string_as_string(
   return ok;
 }
 
+bool BPY_execute_string_as_string(
+    bContext *C, const char *imports[], const char *expr, const bool verbose, char **r_value)
+{
+  size_t value_dummy_size;
+  return BPY_execute_string_as_string_and_size(
+      C, imports, expr, verbose, r_value, &value_dummy_size);
+}
+
 /**
  * Support both int and pointers.
  *