gistfile1.m

NSString *plaintext = @"**text to render**";

struct sd_markdown *markdown;
struct html_renderopt html_options;

unsigned int render_flags = HTML_HARD_WRAP;
unsigned int extensions =   MKDEXT_NO_INTRA_EMPHASIS |
                                        MKDEXT_TABLES |
                                        MKDEXT_FENCED_CODE |
                                        MKDEXT_AUTOLINK |
                                        MKDEXT_STRIKETHROUGH |
                                        MKDEXT_SPACE_HEADERS |
                                        MKDEXT_SUPERSCRIPT |
                                        MKDEXT_LAX_SPACING |
					MKDEXT_FOOTNOTES;
            
struct sd_callbacks callbacks;
sdhtml_renderer(&callbacks, &html_options, render_flags);
markdown = sd_markdown_new(extensions, 16, &callbacks, &html_options);

const char *text = [plaintext UTF8String];
struct buf *ib = bufnew(64);
bufputs(ib, text);
        
struct buf *ob = bufnew(64);
sd_markdown_render(ob, ib->data, ib->size, markdown);
bufrelease(ib);
        
struct buf *sb = bufnew(64);
sdhtml_smartypants(sb, ob->data, ob->size);
bufrelease(ob);
ob = sb;
        
NSString *result = [NSString stringWithUTF8String:bufcstr(ob)];
bufrelease(ob);

sd_markdown_free(markdown);