pkt-line.[ch]: remove unused packet_read_line_buf()

This function was added in 4981fe750b (pkt-line: share
buffer/descriptor reading implementation, 2013-02-23), but in
01f9ec64c8 (Use packet_reader instead of packet_read_line,
2018-12-29) the code that was using it was removed.

Since it's being removed we can in turn remove the "src" and "src_len"
arguments to packet_read(), all the remaining users just passed a
NULL/NULL pair to it.

That function is only a thin wrapper for packet_read_with_status()
which still needs those arguments, but for the thin packet_read()
convenience wrapper we can do away with it for now.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/checkout--worker.c

@@ -82,8 +82,8 @@ static void worker_loop(struct checkout *state)
 	size_t i, nr = 0, alloc = 0;
 
 	while (1) {
-		int len = packet_read(0, NULL, NULL, packet_buffer,
+		int len = packet_read(0, packet_buffer, sizeof(packet_buffer),
-				      sizeof(packet_buffer), 0);
+				      0);
 
 		if (len < 0)
 			BUG("packet_read() returned negative value");

daemon.c

@@ -770,7 +770,7 @@ static int execute(void)
 
 	set_keep_alive(0);
 	alarm(init_timeout ? init_timeout : timeout);
-	pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
+	pktlen = packet_read(0, packet_buffer, sizeof(packet_buffer), 0);
 	alarm(0);
 
 	len = strlen(line);

parallel-checkout.c

@@ -603,8 +603,7 @@ static void gather_results_from_workers(struct pc_worker *workers,
 				continue;
 
 			if (pfd->revents & POLLIN) {
-				int len = packet_read(pfd->fd, NULL, NULL,
+				int len = packet_read(pfd->fd, packet_buffer,
-						      packet_buffer,
 						      sizeof(packet_buffer), 0);
 
 				if (len < 0) {

pkt-line.c

@@ -400,38 +400,28 @@ enum packet_read_status packet_read_with_status(int fd, char **src_buffer,
 	return PACKET_READ_NORMAL;
 }
 
-int packet_read(int fd, char **src_buffer, size_t *src_len,
+int packet_read(int fd, char *buffer, unsigned size, int options)
-		char *buffer, unsigned size, int options)
 {
 	int pktlen = -1;
 
-	packet_read_with_status(fd, src_buffer, src_len, buffer, size,
+	packet_read_with_status(fd, NULL, NULL, buffer, size, &pktlen,
-				&pktlen, options);
+				options);
 
 	return pktlen;
 }
 
-static char *packet_read_line_generic(int fd,
+char *packet_read_line(int fd, int *dst_len)
-				      char **src, size_t *src_len,
-				      int *dst_len)
 {
-	int len = packet_read(fd, src, src_len,
+	int len = packet_read(fd, packet_buffer, sizeof(packet_buffer),
-			      packet_buffer, sizeof(packet_buffer),
 			      PACKET_READ_CHOMP_NEWLINE);
 	if (dst_len)
 		*dst_len = len;
 	return (len > 0) ? packet_buffer : NULL;
 }
 
-char *packet_read_line(int fd, int *len_p)
-{
-	return packet_read_line_generic(fd, NULL, NULL, len_p);
-}
-
 int packet_read_line_gently(int fd, int *dst_len, char **dst_line)
 {
-	int len = packet_read(fd, NULL, NULL,
+	int len = packet_read(fd, packet_buffer, sizeof(packet_buffer),
-			      packet_buffer, sizeof(packet_buffer),
 			      PACKET_READ_CHOMP_NEWLINE|PACKET_READ_GENTLE_ON_EOF);
 	if (dst_len)
 		*dst_len = len;
@@ -440,11 +430,6 @@ int packet_read_line_gently(int fd, int *dst_len, char **dst_line)
 	return len;
 }
 
-char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len)
-{
-	return packet_read_line_generic(-1, src, src_len, dst_len);
-}
-
 ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out, int options)
 {
 	int packet_len;
@@ -454,7 +439,7 @@ ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out, int options)
 
 	for (;;) {
 		strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
-		packet_len = packet_read(fd_in, NULL, NULL,
+		packet_len = packet_read(fd_in,
 			/* strbuf_grow() above always allocates one extra byte to
 			 * store a '\0' at the end of the string. packet_read()
 			 * writes a '\0' extra byte at the end, too. Let it know

pkt-line.h

@@ -76,8 +76,7 @@ int write_packetized_from_buf_no_flush(const char *src_in, size_t len, int fd_ou
 #define PACKET_READ_CHOMP_NEWLINE        (1u<<1)
 #define PACKET_READ_DIE_ON_ERR_PACKET    (1u<<2)
 #define PACKET_READ_GENTLE_ON_READ_ERROR (1u<<3)
-int packet_read(int fd, char **src_buffer, size_t *src_len, char
+int packet_read(int fd, char *buffer, unsigned size, int options);
-		*buffer, unsigned size, int options);
 
 /*
  * Convert a four hex digit packet line length header into its numeric
@@ -126,12 +125,6 @@ char *packet_read_line(int fd, int *size);
  */
 int packet_read_line_gently(int fd, int *size, char **dst_line);
 
-/*
- * Same as packet_read_line, but read from a buf rather than a descriptor;
- * see packet_read for details on how src_* is used.
- */
-char *packet_read_line_buf(char **src_buf, size_t *src_len, int *size);
-
 /*
  * Reads a stream of variable sized packets until a flush packet is detected.
  */

remote-curl.c

@@ -1091,7 +1091,7 @@ static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
 		rpc->protocol_header = NULL;
 
 	while (!err) {
-		int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
+		int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0);
 		if (!n)
 			break;
 		rpc->pos = 0;