[Bf-blender-cvs] [5392f220f02] master: BLI_path: add BLI_path_append_dir (appends and ensures trailing slash)

[Campbell Barton]

Commit: 5392f220f024b59d199dfc40ef4817401f22ee2b
Author: Campbell Barton
Date:   Sun Oct 30 15:44:17 2022 +1100
Branches: master
https://developer.blender.org/rB5392f220f024b59d199dfc40ef4817401f22ee2b

BLI_path: add BLI_path_append_dir (appends and ensures trailing slash)

Avoid copying the string then calling BLI_path_slash_ensure afterwards.

===================================================================

M	source/blender/blenlib/BLI_path_util.h
M	source/blender/blenlib/intern/path_util.c
M	source/blender/editors/space_file/file_ops.c

===================================================================

diff --git a/source/blender/blenlib/BLI_path_util.h b/source/blender/blenlib/BLI_path_util.h
index 9c661178322..6d411b51f85 100644
--- a/source/blender/blenlib/BLI_path_util.h
+++ b/source/blender/blenlib/BLI_path_util.h
@@ -68,8 +68,15 @@ const char *BLI_path_extension(const char *filepath) ATTR_NONNULL();
 
 /**
  * Append a filename to a dir, ensuring slash separates.
+ * \return The new length of `dst`.
  */
-void BLI_path_append(char *__restrict dst, size_t maxlen, const char *__restrict file)
+size_t BLI_path_append(char *__restrict dst, size_t maxlen, const char *__restrict file)
+    ATTR_NONNULL();
+/**
+ * A version of #BLI_path_append that ensures a trailing slash if there is space in `dst`.
+ * \return The new length of `dst`.
+ */
+size_t BLI_path_append_dir(char *__restrict dst, size_t maxlen, const char *__restrict dir)
     ATTR_NONNULL();
 
 /**
diff --git a/source/blender/blenlib/intern/path_util.c b/source/blender/blenlib/intern/path_util.c
index 759a1bf0dc7..bb87a26dada 100644
--- a/source/blender/blenlib/intern/path_util.c
+++ b/source/blender/blenlib/intern/path_util.c
@@ -1431,21 +1431,34 @@ const char *BLI_path_extension(const char *filepath)
   return extension;
 }
 
-void BLI_path_append(char *__restrict dst, const size_t maxlen, const char *__restrict file)
+size_t BLI_path_append(char *__restrict dst, const size_t maxlen, const char *__restrict file)
 {
   size_t dirlen = BLI_strnlen(dst, maxlen);
 
-  /* inline BLI_path_slash_ensure */
+  /* Inline #BLI_path_slash_ensure. */
   if ((dirlen > 0) && (dst[dirlen - 1] != SEP)) {
     dst[dirlen++] = SEP;
     dst[dirlen] = '\0';
   }
 
   if (dirlen >= maxlen) {
-    return; /* fills the path */
+    return dirlen; /* fills the path */
   }
 
-  BLI_strncpy(dst + dirlen, file, maxlen - dirlen);
+  return dirlen + BLI_strncpy_rlen(dst + dirlen, file, maxlen - dirlen);
+}
+
+size_t BLI_path_append_dir(char *__restrict dst, const size_t maxlen, const char *__restrict dir)
+{
+  size_t dirlen = BLI_path_append(dst, maxlen, dir);
+  if (dirlen + 1 < maxlen) {
+    /* Inline #BLI_path_slash_ensure. */
+    if ((dirlen > 0) && (dst[dirlen - 1] != SEP)) {
+      dst[dirlen++] = SEP;
+      dst[dirlen] = '\0';
+    }
+  }
+  return dirlen;
 }
 
 size_t BLI_path_join_array(char *__restrict dst,
diff --git a/source/blender/editors/space_file/file_ops.c b/source/blender/editors/space_file/file_ops.c
index c9c4704d16c..f68d329329f 100644
--- a/source/blender/editors/space_file/file_ops.c
+++ b/source/blender/editors/space_file/file_ops.c
@@ -202,8 +202,7 @@ static FileSelect file_select_do(bContext *C, int selected_idx, bool do_diropen)
         }
         else {
           BLI_path_normalize_dir(BKE_main_blendfile_path(bmain), params->dir, sizeof(params->dir));
-          strcat(params->dir, file->relpath);
-          BLI_path_slash_ensure(params->dir, sizeof(params->dir));
+          BLI_path_append_dir(params->dir, sizeof(params->dir), file->relpath);
         }
 
         ED_file_change_dir(C);
@@ -1797,8 +1796,7 @@ static bool file_execute(bContext *C, SpaceFile *sfile)
     }
     else {
       BLI_path_normalize(BKE_main_blendfile_path(bmain), params->dir);
-      BLI_path_append(params->dir, sizeof(params->dir), file->relpath);
-      BLI_path_slash_ensure(params->dir, sizeof(params->dir));
+      BLI_path_append_dir(params->dir, sizeof(params->dir), file->relpath);
     }
     ED_file_change_dir(C);
   }