From d5e4755ee765a5cd69daac00cf04db25cae5fed8 Mon Sep 17 00:00:00 2001
From: Silvan Jegen <s.jegen@gmail.com>
Date: Thu, 8 Sep 2016 20:43:52 +0200
Subject: Implement first version of parsing

---
 yxml.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 101 insertions(+), 1 deletion(-)

diff --git a/yxml.c b/yxml.c
index f575a8d..271bc4a 100644
--- a/yxml.c
+++ b/yxml.c
@@ -1,12 +1,112 @@
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "yxmllib.h"
 
 #define BUFSIZE 8096
 
+typedef struct buffer {
+	int len;
+	char *buffer;
+} buffer;
+
+buffer *buffer_new() {
+	// allocate struct and buffer in one go
+	buffer *buf = malloc(sizeof(buffer)+BUFSIZE);
+	buf->len = 0;
+
+	return buf;
+}
+
+buffer *buffer_reset(buffer *buf) {
+	buf->buffer = memset(buf->buffer, 0, BUFSIZE);
+	buf->len = 0;
+
+	return buf;
+}
+
+buffer *buffer_append(buffer *buf, char *data) {
+	int i;
+
+	for (i = buf->len; data; i++) {
+		buf->buffer[i] = data[i];
+	}
+
+	return buf;
+}
+
 int process(char *fn, yxml_t *state) {
-	yxml_init(state, state+1, BUFSIZE);
+	size_t filelen;
+	char *parsebuffer;
+	int inelement;
+	buffer *contentbuf;
+
+	FILE* f = fopen(fn, "rb");
+	if (!f) {
+		fprintf(stderr, "Could not open %s.", fn);
+		perror("Error:");
+		return 1;
+	}
+
+	// get file size
+	fseek(f, 0L, SEEK_END);
+	filelen = ftell(f);
+	rewind(f);
+
+	parsebuffer = calloc(1, filelen+1);
+	if (!parsebuffer) {
+		fprintf(stderr, "Could not allocate memory for file %s.\n", fn);
+		fclose(f);
+		return 1;
+	}
+
+	if (fread(parsebuffer, filelen, 1 , f) != 1) {
+		fprintf(stderr, "Could not read file into memory for file %s.\n", fn);
+		free(parsebuffer);
+		fclose(f);
+		return 1;
+	}
+
+	fclose(f);
+
+	inelement = 0;
+	contentbuf = buffer_new();
+	if (!contentbuf) {
+		fprintf(stderr, "Could not allocate memory for the element content buffer.\n");
+		fclose(f);
+		return 1;
+	}
+
+	for (; *parsebuffer; parsebuffer++) {
+		yxml_init(state, state+1, BUFSIZE);
+		yxml_ret_t r = yxml_parse(state, *parsebuffer);
+		if(r < 0) {
+			return 1;
+		}
+		switch(r) {
+			case YXML_ELEMSTART:
+				if (!strcmp(state->elem, "article-title")) {
+					inelement = 1;
+				}
+				break;
+
+			case YXML_CONTENT:
+				if (inelement) {
+					buffer_append(contentbuf, state->data);
+				}
+				break;
+
+			case YXML_ELEMEND:
+				if (!strcmp(state->elem, "article-title")) {
+					inelement = 0;
+				}
+				printf("%s\n", contentbuf->buffer);
+				buffer_reset(contentbuf);
+				break;
+		}
+  }
 
 	return 0;
 }
-- 
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