RNA: support extracting names from paths without allocating memory

Support extracting identifiers RNA paths into fixed size buffer
since the maximum size of the identifier is known all cases.

- Add BLI_str_unescape_ex to support limiting the destination buffer.
- Add BLI_str_quoted_substr to copy values into a fixed size buffer.

5 files changed, 37 insertions, 50 deletions

diff --git a/source/blender/editors/animation/anim_deps.c b/source/blender/editors/animation/anim_deps.c
index 916d4232f03..97679723d84 100644
--- a/source/blender/editors/animation/anim_deps.c
+++ b/source/blender/editors/animation/anim_deps.c
@@ -206,16 +206,17 @@ static void animchan_sync_fcurve_scene(bAnimListElem *ale)
   BLI_assert(GS(owner_id->name) == ID_SCE);
   Scene *scene = (Scene *)owner_id;
   FCurve *fcu = (FCurve *)ale->data;
+  Sequence *seq = NULL;
 
   /* Only affect if F-Curve involves sequence_editor.sequences. */
-  char *seq_name = BLI_str_quoted_substrN(fcu->rna_path, "sequences_all[");
-  if (seq_name == NULL) {
+  char seq_name[sizeof(seq->name)];
+  if (!BLI_str_quoted_substr(fcu->rna_path, "sequences_all[", seq_name, sizeof(seq_name))) {
     return;
   }
 
   /* Check if this strip is selected. */
   Editing *ed = SEQ_editing_get(scene);
-  Sequence *seq = SEQ_get_sequence_by_name(ed->seqbasep, seq_name, false);
+  seq = SEQ_get_sequence_by_name(ed->seqbasep, seq_name, false);
   MEM_freeN(seq_name);
 
   if (seq == NULL) {
diff --git a/source/blender/editors/animation/anim_filter.c b/source/blender/editors/animation/anim_filter.c
index 104540e2257..b12e0ae5cab 100644
--- a/source/blender/editors/animation/anim_filter.c
+++ b/source/blender/editors/animation/anim_filter.c
@@ -1061,13 +1061,14 @@ static bool skip_fcurve_selected_data(bDopeSheet *ads, FCurve *fcu, ID *owner_id
 
   if (GS(owner_id->name) == ID_OB) {
     Object *ob = (Object *)owner_id;
-    char *bone_name;
+    bPoseChannel *pchan = NULL;
+    char bone_name[sizeof(pchan->name)];
 
     /* Only consider if F-Curve involves `pose.bones`. */
-    if (fcu->rna_path && (bone_name = BLI_str_quoted_substrN(fcu->rna_path, "pose.bones["))) {
+    if (fcu->rna_path &&
+        BLI_str_quoted_substr(fcu->rna_path, "pose.bones[", bone_name, sizeof(bone_name))) {
       /* Get bone-name, and check if this bone is selected. */
-      bPoseChannel *pchan = BKE_pose_channel_find_name(ob->pose, bone_name);
-      MEM_freeN(bone_name);
+      pchan = BKE_pose_channel_find_name(ob->pose, bone_name);
 
       /* check whether to continue or skip */
       if (pchan && pchan->bone) {
@@ -1097,17 +1098,17 @@ static bool skip_fcurve_selected_data(bDopeSheet *ads, FCurve *fcu, ID *owner_id
   }
   else if (GS(owner_id->name) == ID_SCE) {
     Scene *scene = (Scene *)owner_id;
-    char *seq_name;
+    Sequence *seq = NULL;
+    char seq_name[sizeof(seq->name)];
 
     /* Only consider if F-Curve involves `sequence_editor.sequences`. */
-    if (fcu->rna_path && (seq_name = BLI_str_quoted_substrN(fcu->rna_path, "sequences_all["))) {
+    if (fcu->rna_path &&
+        BLI_str_quoted_substr(fcu->rna_path, "sequences_all[", seq_name, sizeof(seq_name))) {
       /* Get strip name, and check if this strip is selected. */
-      Sequence *seq = NULL;
       Editing *ed = SEQ_editing_get(scene);
       if (ed) {
         seq = SEQ_get_sequence_by_name(ed->seqbasep, seq_name, false);
       }
-      MEM_freeN(seq_name);
 
       /* Can only add this F-Curve if it is selected. */
       if (ads->filterflag & ADS_FILTER_ONLYSEL) {
@@ -1139,14 +1140,14 @@ static bool skip_fcurve_selected_data(bDopeSheet *ads, FCurve *fcu, ID *owner_id
   }
   else if (GS(owner_id->name) == ID_NT) {
     bNodeTree *ntree = (bNodeTree *)owner_id;
-    char *node_name;
+    bNode *node = NULL;
+    char node_name[sizeof(node->name)];
 
     /* Check for selected nodes. */
-    if (fcu->rna_path && (node_name = BLI_str_quoted_substrN(fcu->rna_path, "nodes["))) {
-      bNode *node = NULL;
+    if (fcu->rna_path &&
+        (BLI_str_quoted_substr(fcu->rna_path, "nodes[", node_name, sizeof(node_name)))) {
       /* Get strip name, and check if this strip is selected. */
       node = nodeFindNodebyName(ntree, node_name);
-      MEM_freeN(node_name);
 
       /* Can only add this F-Curve if it is selected. */
       if (node) {
diff --git a/source/blender/editors/animation/anim_ipo_utils.c b/source/blender/editors/animation/anim_ipo_utils.c
index eda87cf1897..33b4882927a 100644
--- a/source/blender/editors/animation/anim_ipo_utils.c
+++ b/source/blender/editors/animation/anim_ipo_utils.c
@@ -106,23 +106,14 @@ int getname_anim_fcurve(char *name, ID *id, FCurve *fcu)
        * - If a pointer just refers to the ID-block, then don't repeat this info
        *   since this just introduces clutter.
        */
-      if (strstr(fcu->rna_path, "bones") && strstr(fcu->rna_path, "constraints")) {
-        /* perform string 'chopping' to get "Bone Name : Constraint Name" */
-        char *pchanName = BLI_str_quoted_substrN(fcu->rna_path, "bones[");
-        char *constName = BLI_str_quoted_substrN(fcu->rna_path, "constraints[");
+
+      char pchanName[256], constName[256];
+      if (BLI_str_quoted_substr(fcu->rna_path, "bones[", pchanName, sizeof(pchanName)) &&
+          BLI_str_quoted_substr(fcu->rna_path, "constraints[", constName, sizeof(constName))) {
 
         /* assemble the string to display in the UI... */
-        structname = BLI_sprintfN(
-            "%s : %s", pchanName ? pchanName : "", constName ? constName : "");
+        structname = BLI_sprintfN("%s : %s", pchanName, constName);
         free_structname = 1;
-
-        /* free the temp names */
-        if (pchanName) {
-          MEM_freeN(pchanName);
-        }
-        if (constName) {
-          MEM_freeN(constName);
-        }
       }
       else if (ptr.data != ptr.owner_id) {
         PropertyRNA *nameprop = RNA_struct_name_property(ptr.type);
@@ -139,18 +130,15 @@ int getname_anim_fcurve(char *name, ID *id, FCurve *fcu)
          * displaying the struct name alone is no meaningful information (and also cannot be
          * filtered well), same for modifiers. So display strip name alongside as well. */
         if (GS(ptr.owner_id->name) == ID_SCE) {
-          if (BLI_str_startswith(fcu->rna_path, "sequence_editor.sequences_all[\"")) {
+          char stripname[256];
+          if (BLI_str_quoted_substr(
+                  fcu->rna_path, "sequence_editor.sequences_all[", stripname, sizeof(stripname))) {
             if (strstr(fcu->rna_path, ".transform.") || strstr(fcu->rna_path, ".crop.") ||
                 strstr(fcu->rna_path, ".modifiers[")) {
-              char *stripname = BLI_str_quoted_substrN(fcu->rna_path, "sequences_all[");
-              const char *structname_all = BLI_sprintfN(
-                  "%s : %s", stripname ? stripname : "", structname);
+              const char *structname_all = BLI_sprintfN("%s : %s", stripname, structname);
               if (free_structname) {
                 MEM_freeN((void *)structname);
               }
-              if (stripname) {
-                MEM_freeN(stripname);
-              }
               structname = structname_all;
               free_structname = 1;
             }
diff --git a/source/blender/editors/animation/keyframes_general.c b/source/blender/editors/animation/keyframes_general.c
index 9f3fe239113..ec33a42af3b 100644
--- a/source/blender/editors/animation/keyframes_general.c
+++ b/source/blender/editors/animation/keyframes_general.c
@@ -761,11 +761,10 @@ short copy_animedit_keys(bAnimContext *ac, ListBase *anim_data)
     if ((aci->id_type == ID_OB) && (((Object *)aci->id)->type == OB_ARMATURE) && aci->rna_path) {
       Object *ob = (Object *)aci->id;
 
-      char *bone_name = BLI_str_quoted_substrN(aci->rna_path, "pose.bones[");
-      if (bone_name) {
-        bPoseChannel *pchan = BKE_pose_channel_find_name(ob->pose, bone_name);
-        MEM_freeN(bone_name);
-
+      bPoseChannel *pchan;
+      char bone_name[sizeof(pchan->name)];
+      if (BLI_str_quoted_substr(aci->rna_path, "pose.bones[", bone_name, sizeof(bone_name))) {
+        pchan = BKE_pose_channel_find_name(ob->pose, bone_name);
         if (pchan) {
           aci->is_bone = true;
         }
diff --git a/source/blender/editors/animation/keyframing.c b/source/blender/editors/animation/keyframing.c
index 292d665caca..8dc4aed9f0e 100644
--- a/source/blender/editors/animation/keyframing.c
+++ b/source/blender/editors/animation/keyframing.c
@@ -2218,11 +2218,11 @@ static int clear_anim_v3d_exec(bContext *C, wmOperator *UNUSED(op))
         if (ob->mode & OB_MODE_POSE) {
           if (fcu->rna_path) {
             /* Get bone-name, and check if this bone is selected. */
-            char *bone_name = BLI_str_quoted_substrN(fcu->rna_path, "pose.bones[");
-            if (bone_name) {
-              bPoseChannel *pchan = BKE_pose_channel_find_name(ob->pose, bone_name);
-              MEM_freeN(bone_name);
-
+            bPoseChannel *pchan = NULL;
+            char bone_name[sizeof(pchan->name)];
+            if (BLI_str_quoted_substr(
+                    fcu->rna_path, "pose.bones[", bone_name, sizeof(bone_name))) {
+              pchan = BKE_pose_channel_find_name(ob->pose, bone_name);
               /* Delete if bone is selected. */
               if ((pchan) && (pchan->bone)) {
                 if (pchan->bone->flag & BONE_SELECTED) {
@@ -2323,13 +2323,11 @@ static int delete_key_v3d_without_keying_set(bContext *C, wmOperator *op)
           bPoseChannel *pchan = NULL;
 
           /* Get bone-name, and check if this bone is selected. */
-          char *bone_name = BLI_str_quoted_substrN(fcu->rna_path, "pose.bones[");
-          if (bone_name == NULL) {
+          char bone_name[sizeof(pchan->name)];
+          if (!BLI_str_quoted_substr(fcu->rna_path, "pose.bones[", bone_name, sizeof(bone_name))) {
             continue;
           }
-
           pchan = BKE_pose_channel_find_name(ob->pose, bone_name);
-          MEM_freeN(bone_name);
 
           /* skip if bone is not selected */
           if ((pchan) && (pchan->bone)) {