common: simplify and optimize string escape parsing

This code is shared between input.conf parser and option parser. Until
now, the performance didn't really matter. But I want to use this code
for JSON parsing too, and since JSON will have to be parsed a lot, it
should probably try to avoid realloc'ing too much.

This commit moves parsing of C-style escaped strings into a common
function, and allows using it in a way realloc can be completely
avoided, if the already allocated buffer is large enough.

1 files changed, 7 insertions, 1 deletions

diff --git a/common/common.h b/common/common.h
index ae2fb8f2d5..7ae18d1b6f 100644
--- a/common/common.h
+++ b/common/common.h
@@ -76,6 +76,12 @@ bool mp_rect_intersection(struct mp_rect *rc, const struct mp_rect *rc2);
 char *mp_append_utf8_buffer(char *buffer, uint32_t codepoint);
 
 struct bstr;
-bool mp_parse_escape(struct bstr *code, char **str);
+
+void mp_append_utf8_bstr(void *talloc_ctx, struct bstr *buf, uint32_t codepoint);
+
+bool mp_append_escaped_string_noalloc(void *talloc_ctx, struct bstr *dst,
+                                      struct bstr *src);
+bool mp_append_escaped_string(void *talloc_ctx, struct bstr *dst,
+                              struct bstr *src);
 
 #endif /* MPLAYER_MPCOMMON_H */