From 6d76ec29ec2468175a8523e30ca5f9d2d2c1163f Mon Sep 17 00:00:00 2001
From: Olaf Rempel <razzor@kopf-tisch.de>
Date: Tue, 19 Jun 2007 15:20:31 +0200
Subject: [PATCH] linebuffer update

---
 connection.c |   6 +--
 linebuffer.c | 108 +++++++++++++++++++++++++++++++++++++--------------
 linebuffer.h |  19 ++++++---
 3 files changed, 94 insertions(+), 39 deletions(-)

diff --git a/connection.c b/connection.c
index ede9aad..c6d2f53 100644
--- a/connection.c
+++ b/connection.c
@@ -52,7 +52,7 @@ static int data_cb(int fd, void *privdata)
 {
 	struct client_con *con = (struct client_con *)privdata;
 
-	if (linebuffer_read(con->lbuf, fd) < 0) {
+	if (linebuffer_readfd(con->lbuf, fd) < 0) {
 		log_print(LOG_WARN, "data_cb(): client %s read", get_sockaddr_buf(&con->addr));
 		list_del(&con->list);
 		free_client(con);
@@ -60,7 +60,7 @@ static int data_cb(int fd, void *privdata)
 	}
 
 	char *line;
-	while ((line = linebuffer_get(con->lbuf)) != NULL) {
+	while ((line = linebuffer_getline(con->lbuf, NULL)) != NULL) {
 		if (strncmp(line, "CTBW ", 5) == 0) {
 			int bwup, bwdn, liup, lidn;
 			if (sscanf(line +5, "%d,%d %d,%d", &bwdn, &bwup, &lidn, &liup) == 4) {
@@ -87,7 +87,7 @@ static int data_cb(int fd, void *privdata)
 				con->chunk_avail = chunk3;
 			}
 		}
-		free(line);
+		linebuffer_freeline(con->lbuf);
 	}
 	return 0;
 }
diff --git a/linebuffer.c b/linebuffer.c
index 88d13d6..b0a3eb7 100644
--- a/linebuffer.c
+++ b/linebuffer.c
@@ -2,67 +2,115 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
+#include <stdarg.h>
 
 #include "linebuffer.h"
 
+#define MIN(a,b) (((a) < (b)) ? (a) : (b))
+
 struct linebuffer * create_linebuffer(int size)
 {
-	struct linebuffer *retval = malloc(sizeof(struct linebuffer) + size);
-	if (retval == NULL)
+	struct linebuffer *buf = malloc(sizeof(struct linebuffer));
+	if (buf == NULL)
 		return NULL;
 
-	retval->size = size;
-	retval->pos = 0;
-	return retval;
+	buf->size = size;
+	buf->data = malloc(buf->size);
+	if (buf->data == NULL) {
+		free(buf);
+		return NULL;
+	}
+
+	buf->pos = 0;
+	return buf;
 }
 
-int linebuffer_read(struct linebuffer *lbuf, int fd)
+void linebuffer_free(struct linebuffer *buf)
 {
-	char buf[32];
-	int len = read(fd, buf, sizeof(buf));
+	free(buf->data);
+	free(buf);
+}
+
+int linebuffer_clear(struct linebuffer *buf)
+{
+	int oldpos = buf->pos;
+	buf->pos = 0;
+	return oldpos;
+}
+
+int linebuffer_put(struct linebuffer *buf, const char *src, unsigned int size)
+{
+	int len = MIN(buf->size - buf->pos, size);
+	memcpy(buf->data + buf->pos, src, len);
+	return len;
+}
+
+int linebuffer_readfd(struct linebuffer *buf, int fd)
+{
+	int len = read(fd, buf->data + buf->pos, buf->size - buf->pos);
+	if (len <= 0)
+		return len;
+
+	buf->pos += len;
+	return len;
+}
+
+int linebuffer_parsefd(struct linebuffer *buf, int fd)
+{
+	char tmp[32];
+	int len = read(fd, tmp, sizeof(tmp));
 	if (len <= 0)
 		return -1;
 
 	int i;
 	for (i = 0; i < len; i++) {
 		/* "understand" backspace */
-		if (buf[i] == 0x08 && lbuf->pos > 0) {
-			lbuf->pos--;
+		if (tmp[i] == 0x08 && buf->pos > 0) {
+			buf->pos--;
 
 		/* copy */
-		} else if (buf[i] >= ' ' || buf[i] == '\n') {
-			lbuf->data[lbuf->pos++] = buf[i];
+		} else if (tmp[i] >= ' ' || tmp[i] == '\n') {
+			*(buf->data + buf->pos++) = tmp[i];
 		}
 
-		if (lbuf->pos > lbuf->size)
+		if (buf->pos > buf->size)
 			return -1;
 	}
-
 	return 0;
 }
 
-char * linebuffer_get(struct linebuffer *lbuf)
+int linebuffer_printf(struct linebuffer *buf, const char *fmt, ...)
 {
-	char *newline = memchr(lbuf->data, '\n', lbuf->pos);
-	if (newline == NULL)
+	va_list az;
+	va_start(az, fmt);
+	int len = vsnprintf(buf->data + buf->pos, buf->size - buf->pos, fmt, az);
+	va_end(az);
+
+	if (len < 0 || len >= (buf->size - buf->pos))
+		return -1;
+
+	buf->pos += len;
+	return len;
+}
+
+char * linebuffer_getline(struct linebuffer *buf, int *len)
+{
+	buf->newline = memchr(buf->data, '\n', buf->pos);
+	if (buf->newline == NULL)
 		return NULL;
 
-	char *retval = NULL;
-	*newline = '\0';
+	*(buf->newline) = '\0';
 
-	int len = newline - lbuf->data;
-	if (len > 0)
-		retval = strdup(lbuf->data);
+	if (len != NULL)
+		*len = buf->newline - buf->data;
 
-	lbuf->pos -= len +1;
-	memmove(lbuf->data, newline +1, lbuf->pos);
-
-	return retval;
+	return buf->data;
 }
 
-int linebuffer_clear(struct linebuffer *lbuf)
+int linebuffer_freeline(struct linebuffer *buf)
 {
-	int oldpos = lbuf->pos;
-	lbuf->pos = 0;
-	return oldpos;
+	buf->pos -= (buf->newline - buf->data) +1;
+	memmove(buf->data, buf->newline +1, buf->pos);
+	buf->newline = NULL;
+	return buf->pos;
 }
diff --git a/linebuffer.h b/linebuffer.h
index e9d2a77..de5a1b0 100644
--- a/linebuffer.h
+++ b/linebuffer.h
@@ -2,17 +2,24 @@
 #define _LINEBUFFER_H_
 
 struct linebuffer {
-	int size;
-	int pos;
+	unsigned int size;
+	unsigned int pos;
 
-	char data[0];
+	char *newline;
+	char *data;
 };
 
 struct linebuffer * create_linebuffer(int size);
+void linebuffer_free(struct linebuffer *buf);
 
-int linebuffer_read(struct linebuffer *lbuf, int fd);
-char * linebuffer_get(struct linebuffer *lbuf);
+int linebuffer_clear(struct linebuffer *buf);
 
-int linebuffer_clear(struct linebuffer *lbuf);
+int linebuffer_put(struct linebuffer *buf, const char *src, unsigned int size);
+int linebuffer_readfd(struct linebuffer *buf, int fd);
+int linebuffer_parsefd(struct linebuffer *buf, int fd);
+int linebuffer_printf(struct linebuffer *buf, const char *fmt, ...);
+
+char * linebuffer_getline(struct linebuffer *buf, int *len);
+int linebuffer_freeline(struct linebuffer *buf);
 
 #endif /* _LINEBUFFER_H_ */