[PATCH 06 of 14 RFC c-hglib:level0] hg_rawcommand: send a command to the mercurial command server

[Iulian Stana]

# HG changeset patch
# User Iulian Stana <julian.stana at gmail.com>
# Date 1378235031 -10800
#      Tue Sep 03 22:03:51 2013 +0300
# Node ID bc8721af130cb444e6a0c5351c6ea56f44f283ab
# Parent  1d20e8ae28ff6b4b39eb527888c3869ab5e98b86
hg_rawcommand: send a command to the mercurial command server

diff --git a/client.c b/client.c
--- a/client.c
+++ b/client.c
@@ -10,6 +10,9 @@
 #include <signal.h>
 
 
+#include "client.h"
+#include "utils.h"
+
 /**
  * \brief Reading the header from cmdsrv.
  *
@@ -172,5 +175,48 @@
 	return 0;
 }
 
-#include "client.h"
-#include "utils.h"
+/*
+ * Sending a command to the mercurial command server, through the given handle.
+ * */
+int hg_rawcommand(hg_handle *handle, char *const command[])
+{
+	if(!handle) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if(handle->protect){
+		errno = EPERM;
+		return -1;
+	}
+
+	char runcommand[] = "runcommand\n";
+	int cmd_size = 0;
+	char *cmd_send = cmd_prepare(command, &cmd_size);
+	uint32_t big_endian_size = swap_uint32(cmd_size);
+
+	if(write(handle->p_write, runcommand, strlen(runcommand)) < 0){
+		free(cmd_send);
+		return -1;
+	}
+	if(write(handle->p_write, &big_endian_size, sizeof(uint32_t)) < 0){
+		free(cmd_send);
+		return -1;
+	}
+	if(write(handle->p_write, cmd_send, cmd_size) < 0){
+		free(cmd_send);
+		return -1;
+	}
+
+	if(read_header(handle) < 0){
+		free(cmd_send);
+		return -1;
+	}
+
+	free_data(handle);
+	handle->protect = 1;
+	free(cmd_send);
+	return 0;
+}
+
+
diff --git a/client.h b/client.h
--- a/client.h
+++ b/client.h
@@ -85,5 +85,20 @@
  * */
 int hg_close(hg_handle **handle);
 
+/**
+ * \brief Sending a command to the mercurial command server, through the given 
+ *        handle.
+ * \param handle The handle of the connection, wherewith I want to communicate
+ * \param command An array of pointers to null-terminated strings that represent
+ *                the argument list available to the new command. The list of
+ *                arguments must be terminated by a NULL pointer.
+ * \retval   0 if successful
+ * \retval  -1 to indicate an error, with errno set appropriately.
+ *
+ * errno can be:
+ *      - EINVAL   - Invalid argument ( handle it's set to a null pointer)
+ *      - write(2) command errors
+ * */
+int hg_rawcommand(hg_handle *handle, char *const command[]);
 
 #endif