[cmark] Add wrappers.

vendor/cmark/cmark.odin

@@ -106,12 +106,16 @@ foreign lib {
 	markdown_to_html :: proc(text: cstring, length: c.size_t, options: Options) -> (html: cstring) ---
 }
 
+markdown_to_html_from_string :: proc(text: string, options: Options) -> (html: string) {
+	return string(markdown_to_html(cstring(raw_data(text)), len(text), options))
+}
+
 // Custom allocator - Defines the memory allocation functions to be used by CMark
 // when parsing and allocating a document tree
 Allocator :: struct {
-	calloc:  proc(c.size_t, c.size_t) -> rawptr,
-	realloc: proc(rawptr, c.size_t)   -> rawptr,
-	free:    proc(rawptr),
+	calloc:  proc "c" (c.size_t, c.size_t) -> rawptr,
+	realloc: proc "c" (rawptr, c.size_t)   -> rawptr,
+	free:    proc "c" (rawptr),
 }
 
 @(default_calling_convention="c", link_prefix="cmark_")
@@ -427,6 +431,13 @@ foreign lib {
 	parse_from_libc_file :: proc(file: ^libc.FILE, options: Options) -> (root: ^Node) ---
 }
 
+parser_feed_from_string :: proc "c" (parser: ^Parser, s: string) {
+	parser_feed(parser, raw_data(s), len(s))
+}
+parse_document_from_string :: proc "c" (s: string, options: Options) -> (root: ^Node) {
+	return parse_document(raw_data(s), len(s), options)
+}
+
 // Rendering
 @(default_calling_convention="c", link_prefix="cmark_")
 foreign lib {
@@ -453,11 +464,14 @@ foreign lib {
 }
 
 // Helpers to free results from `render_*`.
-free_rawptr :: proc (ptr: rawptr) {
+free_rawptr :: proc "c" (ptr: rawptr) {
 	cmm := get_default_mem_allocator()
 	cmm.free(ptr)
 }
-free_cstring :: proc (str: cstring) {
+free_cstring :: proc "c" (str: cstring) {
 	free_rawptr(rawptr(str))
 }
+free_string :: proc "c" (s: string) {
+    free_rawptr(raw_data(s))
+}
 free :: proc{free_rawptr, free_cstring}