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.

1 files changed, 11 insertions, 1 deletions

diff --git a/source/blender/blenlib/BLI_string.h b/source/blender/blenlib/BLI_string.h
index c20376c42b9..eab39433796 100644
--- a/source/blender/blenlib/BLI_string.h
+++ b/source/blender/blenlib/BLI_string.h
@@ -65,7 +65,10 @@ bool BLI_str_quoted_substr_range(const char *__restrict str,
 char *BLI_str_quoted_substrN(const char *__restrict str,
                              const char *__restrict prefix) ATTR_WARN_UNUSED_RESULT
     ATTR_NONNULL() ATTR_MALLOC;
-
+bool BLI_str_quoted_substr(const char *__restrict str,
+                           const char *__restrict prefix,
+                           char *result,
+                           size_t result_maxlen);
 char *BLI_str_replaceN(const char *__restrict str,
                        const char *__restrict substr_old,
                        const char *__restrict substr_new) ATTR_WARN_UNUSED_RESULT
@@ -97,8 +100,15 @@ char *BLI_sprintfN(const char *__restrict format, ...) ATTR_WARN_UNUSED_RESULT
 
 size_t BLI_str_escape(char *__restrict dst, const char *__restrict src, const size_t dst_maxncpy)
     ATTR_NONNULL();
+size_t BLI_str_unescape_ex(char *__restrict dst,
+                           const char *__restrict src,
+                           const size_t src_maxncpy,
+                           /* Additional arguments. */
+                           const size_t dst_maxncpy,
+                           bool *r_is_complete) ATTR_NONNULL();
 size_t BLI_str_unescape(char *__restrict dst, const char *__restrict src, const size_t src_maxncpy)
     ATTR_NONNULL();
+
 const char *BLI_str_escape_find_quote(const char *str) ATTR_NONNULL();
 
 size_t BLI_str_format_int_grouped(char dst[16], int num) ATTR_NONNULL();