1 files changed, 160 insertions, 0 deletions
diff --git a/src/buffer.c b/src/buffer.c
new file mode 100644
index 0000000..4fac110
--- /dev/null
+++ b/src/buffer.c
@@ -0,0 +1,160 @@
+/*
+ * (C) 2012-2014 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * 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 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <buffer.h>
+#include <libnftnl/common.h>
+#include "internal.h"
+
+int nft_buf_update(struct nft_buf *b, int ret)
+{
+	if (ret < 0) {
+		b->fail = true;
+	} else {
+		b->off += ret;
+		if (ret > b->len)
+			ret = b->len;
+		b->size += ret;
+		b->len -= ret;
+	}
+
+	return ret;
+}
+
+int nft_buf_done(struct nft_buf *b)
+{
+	if (b->fail)
+		return -1;
+
+	/* Remove trailing comma in json */
+	if (b->size > 0 && b->buf[b->size - 1] == ',') {
+		b->off--;
+		b->size--;
+		b->len++;
+	}
+
+	return b->off;
+}
+
+static int nft_buf_put(struct nft_buf *b, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+
+	va_start(ap, fmt);
+	ret = vsnprintf(b->buf + b->off, b->len, fmt, ap);
+	ret = nft_buf_update(b, ret);
+	va_end(ap);
+
+	return ret;
+}
+
+int nft_buf_open(struct nft_buf *b, int type, const char *tag)
+{
+	switch (type) {
+	case NFT_OUTPUT_XML:
+		return nft_buf_put(b, "<%s>", tag);
+	case NFT_OUTPUT_JSON:
+		return nft_buf_put(b, "{\"%s\":{", tag);
+	default:
+		return 0;
+	}
+}
+
+int nft_buf_close(struct nft_buf *b, int type, const char *tag)
+{
+	switch (type) {
+	case NFT_OUTPUT_XML:
+		return nft_buf_put(b, "</%s>");
+	case NFT_OUTPUT_JSON:
+		/* Remove trailing comma in json */
+		if (b->size > 0 && b->buf[b->size - 1] == ',') {
+			b->off--;
+			b->size--;
+			b->len++;
+		}
+
+		return nft_buf_put(b, "}}");
+	default:
+		return 0;
+	}
+}
+
+int nft_buf_u32(struct nft_buf *b, int type, uint32_t value, const char *tag)
+{
+	switch (type) {
+	case NFT_OUTPUT_XML:
+		return nft_buf_put(b, "<%s>%u</%s>", tag, value, tag);
+	case NFT_OUTPUT_JSON:
+		return nft_buf_put(b, "\"%s\":%u,", tag, value);
+	default:
+		return 0;
+	}
+}
+
+int nft_buf_s32(struct nft_buf *b, int type, uint32_t value, const char *tag)
+{
+	switch (type) {
+	case NFT_OUTPUT_XML:
+		return nft_buf_put(b, "<%s>%d</%s>", tag, value, tag);
+	case NFT_OUTPUT_JSON:
+		return nft_buf_put(b, "\"%s\":%d,", tag, value);
+	default:
+		return 0;
+	}
+}
+
+int nft_buf_u64(struct nft_buf *b, int type, uint64_t value, const char *tag)
+{
+	switch (type) {
+	case NFT_OUTPUT_XML:
+		return nft_buf_put(b, "<%s>%"PRIu64"</%s>", tag, value, tag);
+	case NFT_OUTPUT_JSON:
+		return nft_buf_put(b, "\"%s\":%"PRIu64",", tag, value);
+	default:
+		return 0;
+	}
+}
+
+int nft_buf_str(struct nft_buf *b, int type, const char *str, const char *tag)
+{
+	switch (type) {
+	case NFT_OUTPUT_XML:
+		return nft_buf_put(b, "<%s>%s</%s>", tag, str, tag);
+	case NFT_OUTPUT_JSON:
+		return nft_buf_put(b, "\"%s\":\"%s\",", tag, str);
+	default:
+		return 0;
+	}
+}
+
+int nft_buf_reg(struct nft_buf *b, int type, union nft_data_reg *reg,
+		int reg_type, const char *tag)
+{
+	int ret;
+
+	switch (type) {
+	case NFT_OUTPUT_XML:
+		ret = nft_buf_put(b, "<%s>", tag);
+		ret = nft_data_reg_snprintf(b->buf + b->off, b->len, reg,
+                                    NFT_OUTPUT_XML, 0, reg_type);
+		nft_buf_update(b, ret);
+		return nft_buf_put(b, "</%s>", tag);
+	case NFT_OUTPUT_JSON:
+		nft_buf_put(b, "\"%s\":{", tag);
+		ret = nft_data_reg_snprintf(b->buf + b->off, b->len, reg,
+					    NFT_OUTPUT_JSON, 0, reg_type);
+		nft_buf_update(b, ret);
+		return nft_buf_put(b, "},");
+	}
+	return 0;
+}