memmem, not rendering yet

include/psyc/lib.h

@@ -7,3 +7,8 @@
 #define unless(COND)    if (!(COND))
 #define until(COND)     while (!(COND))
 
+#ifndef _GNU_SOURCE
+void *memmem(const void *haystack, size_t haystacklen,
+	     const void *needle,   size_t needlelen);
+#endif
+

include/psyc/render.h

@@ -1,13 +1,26 @@
-int PSYC_renderHeader(struct PSYC_Buffers* pbuf,
+typedef enum {
+	PSYC_FINE = 0,
+	PSYC_NEED_LENGTH = 1
+} PSYC_RenderFlag;
+
+typedef struct {
+	PSYC_RenderFlag flag; ///< flags for the renderer
+	size_t cursor; ///< current position in buffer
+	size_t start; ///< position where the rendered packet starts
+	size_t length; ///< how big is the buffer we allocated
+	uint8_t buffer[]; ///< OMG a C99 feature! variable size buffer!
+} PSYC_RenderState;
+
+int PSYC_renderHeader(PSYC_RenderState render,
                       const uint8_t* name, const size_t nlength,
                       const uint8_t* value, const size_t vlength,
-                      const uchar flags, const uchar modifier);
+                      const uint8_t flags, const uint8_t modifier);
 
-int PSYC_renderBody(struct PSYC_Buffers* pbuf,
+int PSYC_renderBody(PSYC_RenderState render,
                     const uint8_t* method, const size_t mlength,
                     const uint8_t* data, const size_t dlength,
-                    const uchar flags);
+                    const uint8_t flags);
 
-int PSYC_doneRender(struct PSYC_Buffers* pbuf,
+int PSYC_doneRender(PSYC_RenderState render,
                     uint8_t** buf, size_t* written);
 

include/psyc/syntax.h

@@ -10,8 +10,9 @@
 # define PSYC_CONTENT_SIZE_THRESHOLD 444
 #endif
 
-#define C_GLYPH_PACKET_DELIMITER	'.'
-#define S_GLYPH_PACKET_DELIMITER	"."
+#define C_GLYPH_PACKET_DELIMITER	'|'
+#define S_GLYPH_PACKET_DELIMITER	"|"
+#define PSYC_PACKET_DELIMITER	      "\n|\n"
 
 #define	C_GLYPH_SEPARATOR_KEYWORD	'_'
 #define	S_GLYPH_SEPARATOR_KEYWORD	"_"

src/Makefile

@@ -2,8 +2,8 @@ CFLAGS=-I../../include -DDEBUG=2 -DPSYC_COMPILE_LIBRARY -g -O0 -Wall
 CC=cc -I../include
 # CC=clang
 
-S=parser.c match.c
-O=parser.o match.o
+S=parser.c match.c render.c memmem.c
+O=parser.o match.o render.o memmem.o
 
 default: 
 	@/bin/echo -e "Usage:\n\tmake diet - compile with diet libc\n\tmake lib  - compile with normal gnu libc"

src/memmem.c

@@ -0,0 +1,67 @@
+#ifndef _GNU_SOURCE
+
+/* Copyright (C) 1991,92,93,94,96,97,98,2000,2004,2007 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/*
+#ifndef _LIBC
+# include <config.h>
+#endif
+*/
+
+#include <stddef.h>
+#include <string.h>
+
+#ifndef _LIBC
+# define __builtin_expect(expr, val)   (expr)
+#endif
+
+#undef memmem
+
+/* Return the first occurrence of NEEDLE in HAYSTACK.  */
+void *
+memmem (haystack, haystack_len, needle, needle_len)
+     const void *haystack;
+     size_t haystack_len;
+     const void *needle;
+     size_t needle_len;
+{
+  const char *begin;
+  const char *const last_possible
+    = (const char *) haystack + haystack_len - needle_len;
+
+  if (needle_len == 0)
+    /* The first occurrence of the empty string is deemed to occur at
+       the beginning of the string.  */
+    return (void *) haystack;
+
+  /* Sanity check, otherwise the loop might search through the whole
+     memory.  */
+  if (__builtin_expect (haystack_len < needle_len, 0))
+    return NULL;
+
+  for (begin = (const char *) haystack; begin <= last_possible; ++begin)
+    if (begin[0] == ((const char *) needle)[0] &&
+	!memcmp ((const void *) &begin[1],
+		 (const void *) ((const char *) needle + 1),
+		 needle_len - 1))
+      return (void *) begin;
+
+  return NULL;
+}
+
+#endif

src/render.c

@@ -1 +1,25 @@
+#include "psyc/lib.h"
+#include "psyc/render.h"
+#include "psyc/syntax.h"
+
 /* render PSYC packets */
+
+int PSYC_renderBody(PSYC_RenderState render,
+                    const uint8_t* method, const size_t mlength,
+                    const uint8_t* data, const size_t dlength,
+                    const uint8_t flags) {
+
+	// find out if this packet needs a prepended length
+	if (dlength == 1 && data[0] == C_GLYPH_PACKET_DELIMITER)
+	    render.flag = PSYC_NEED_LENGTH;
+	else if (dlength > 404)
+	    render.flag = PSYC_NEED_LENGTH;
+	else if (memmem(data, dlength, PSYC_PACKET_DELIMITER,
+				sizeof(PSYC_PACKET_DELIMITER)))
+	    render.flag = PSYC_NEED_LENGTH;
+	else
+	    render.flag = PSYC_FINE;
+
+	// TBD
+	return 0;
+}