calloc: introduce LIBSSH2_CALLOC()

A simple function using LIBSSH2_ALLOC + memset, since this pattern was
used in multiple places and this simplies code in general.

src/agent.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2009 by Daiki Ueno
- * Copyright (C) 2010 by Daniel Stenberg
+ * Copyright (C) 2014 by Daniel Stenberg
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms,
@@ -660,13 +660,12 @@ libssh2_agent_init(LIBSSH2_SESSION *session)
 {
     LIBSSH2_AGENT *agent;
 
-    agent = LIBSSH2_ALLOC(session, sizeof *agent);
+    agent = LIBSSH2_CALLOC(session, sizeof *agent);
     if (!agent) {
         _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                        "Unable to allocate space for agent connection");
         return NULL;
     }
-    memset(agent, 0, sizeof *agent);
     agent->fd = LIBSSH2_INVALID_SOCKET;
     agent->session = session;
     _libssh2_list_init(&agent->head);

src/channel.c

@@ -158,14 +158,12 @@ _libssh2_channel_open(LIBSSH2_SESSION * session, const char *channel_type,
                        "Opening Channel - win %d pack %d", window_size,
                        packet_size);
         session->open_channel =
-            LIBSSH2_ALLOC(session, sizeof(LIBSSH2_CHANNEL));
+            LIBSSH2_CALLOC(session, sizeof(LIBSSH2_CHANNEL));
         if (!session->open_channel) {
             _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                            "Unable to allocate space for channel data");
             return NULL;
         }
-        memset(session->open_channel, 0, sizeof(LIBSSH2_CHANNEL));
-
         session->open_channel->channel_type_len = channel_type_len;
         session->open_channel->channel_type =
             LIBSSH2_ALLOC(session, channel_type_len);
@@ -509,12 +507,11 @@ channel_forward_listen(LIBSSH2_SESSION * session, const char *host,
         if (data[0] == SSH_MSG_REQUEST_SUCCESS) {
             LIBSSH2_LISTENER *listener;
 
-            listener = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_LISTENER));
+            listener = LIBSSH2_CALLOC(session, sizeof(LIBSSH2_LISTENER));
             if (!listener)
                 _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                                "Unable to allocate memory for listener queue");
             else {
-                memset(listener, 0, sizeof(LIBSSH2_LISTENER));
                 listener->host =
                     LIBSSH2_ALLOC(session, session->fwdLstn_host_len + 1);
                 if (!listener->host) {

src/comp.c

@@ -1,5 +1,5 @@
 /* Copyright (c) 2004-2007, Sara Golemon <sarag@libssh2.org>
- * Copyright (c) 2010, Daniel Stenberg <daniel@haxx.se>
+ * Copyright (c) 2010-2014, Daniel Stenberg <daniel@haxx.se>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms,
@@ -141,13 +141,12 @@ comp_method_zlib_init(LIBSSH2_SESSION * session, int compr,
     z_stream *strm;
     int status;
 
-    strm = LIBSSH2_ALLOC(session, sizeof(z_stream));
+    strm = LIBSSH2_CALLOC(session, sizeof(z_stream));
     if (!strm) {
         return _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                               "Unable to allocate memory for "
                               "zlib compression/decompression");
     }
-    memset(strm, 0, sizeof(z_stream));
 
     strm->opaque = (voidpf) session;
     strm->zalloc = (alloc_func) comp_method_zlib_alloc;

src/hostkey.c

@@ -1,5 +1,5 @@
 /* Copyright (c) 2004-2006, Sara Golemon <sarag@libssh2.org>
- * Copyright (c) 2009 by Daniel Stenberg
+ * Copyright (c) 2009-2014 by Daniel Stenberg
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms,
@@ -347,13 +347,12 @@ hostkey_method_ssh_dss_signv(LIBSSH2_SESSION * session,
     libssh2_sha1_ctx ctx;
     int i;
 
-    *signature = LIBSSH2_ALLOC(session, 2 * SHA_DIGEST_LENGTH);
+    *signature = LIBSSH2_CALLOC(session, 2 * SHA_DIGEST_LENGTH);
     if (!*signature) {
         return -1;
     }
 
     *signature_len = 2 * SHA_DIGEST_LENGTH;
-    memset(*signature, 0, 2 * SHA_DIGEST_LENGTH);
 
     libssh2_sha1_init(&ctx);
     for(i = 0; i < veccount; i++) {

src/knownhost.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2013 by Daniel Stenberg
+ * Copyright (c) 2009-2014 by Daniel Stenberg
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms,
@@ -149,13 +149,11 @@ knownhost_add(LIBSSH2_KNOWNHOSTS *hosts,
         return _libssh2_error(hosts->session, LIBSSH2_ERROR_INVAL,
                               "No key type set");
 
-    if(!(entry = LIBSSH2_ALLOC(hosts->session, sizeof(struct known_host))))
+    if(!(entry = LIBSSH2_CALLOC(hosts->session, sizeof(struct known_host))))
         return _libssh2_error(hosts->session, LIBSSH2_ERROR_ALLOC,
                               "Unable to allocate memory for known host "
                               "entry");
 
-    memset(entry, 0, sizeof(struct known_host));
-
     entry->typemask = typemask;
 
     switch(entry->typemask  & LIBSSH2_KNOWNHOST_TYPE_MASK) {

src/libssh2_priv.h

@@ -1,5 +1,5 @@
 /* Copyright (c) 2004-2008, 2010, Sara Golemon <sarag@libssh2.org>
- * Copyright (c) 2009-2011 by Daniel Stenberg
+ * Copyright (c) 2009-2014 by Daniel Stenberg
  * Copyright (c) 2010 Simon Josefsson
  * All rights reserved.
  *
@@ -152,6 +152,7 @@ static inline int writev(int sock, struct iovec *iov, int nvecs)
 
 #define LIBSSH2_ALLOC(session, count) \
   session->alloc((count), &(session)->abstract)
+#define LIBSSH2_CALLOC(session, count) _libssh2_calloc(session, count)
 #define LIBSSH2_REALLOC(session, ptr, count) \
  ((ptr) ? session->realloc((ptr), (count), &(session)->abstract) : \
  session->alloc((count), &(session)->abstract))

src/misc.c

@@ -1,5 +1,5 @@
 /* Copyright (c) 2004-2007 Sara Golemon <sarag@libssh2.org>
- * Copyright (c) 2009-2010 by Daniel Stenberg
+ * Copyright (c) 2009-2014 by Daniel Stenberg
  * Copyright (c) 2010  Simon Josefsson
  * All rights reserved.
  *
@@ -619,3 +619,12 @@ int __cdecl _libssh2_gettimeofday(struct timeval *tp, void *tzp)
 
 
 #endif
+
+void *_libssh2_calloc(LIBSSH2_SESSION* session, size_t size)
+{
+    void *p = LIBSSH2_ALLOC(session, size);
+    if(p) {
+        memset(p, 0, size);
+    }
+    return p;
+}

src/misc.h

@@ -1,6 +1,6 @@
 #ifndef __LIBSSH2_MISC_H
 #define __LIBSSH2_MISC_H
-/* Copyright (c) 2009-2011 by Daniel Stenberg
+/* Copyright (c) 2009-2014 by Daniel Stenberg
  *
  * All rights reserved.
  *
@@ -77,6 +77,7 @@ libssh2_uint64_t _libssh2_ntohu64(const unsigned char *buf);
 void _libssh2_htonu32(unsigned char *buf, uint32_t val);
 void _libssh2_store_u32(unsigned char **buf, uint32_t value);
 void _libssh2_store_str(unsigned char **buf, const char *str, size_t len);
+void *_libssh2_calloc(LIBSSH2_SESSION* session, size_t size);
 
 #if defined(LIBSSH2_WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
 /* provide a private one */

src/packet.c

@@ -1,6 +1,6 @@
 /* Copyright (c) 2004-2007, Sara Golemon <sarag@libssh2.org>
  * Copyright (c) 2005,2006 Mikhail Gusarov
- * Copyright (c) 2009-2013 by Daniel Stenberg
+ * Copyright (c) 2009-2014 by Daniel Stenberg
  * Copyright (c) 2010 Simon Josefsson
  * All rights reserved.
  *
@@ -139,7 +139,7 @@ packet_queue_listener(LIBSSH2_SESSION * session, unsigned char *data,
                         break;
                     }
 
-                    channel = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_CHANNEL));
+                    channel = LIBSSH2_CALLOC(session, sizeof(LIBSSH2_CHANNEL));
                     if (!channel) {
                         _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                                        "Unable to allocate a channel for "
@@ -150,8 +150,6 @@ packet_queue_listener(LIBSSH2_SESSION * session, unsigned char *data,
                     }
                     listen_state->channel = channel;
 
-                    memset(channel, 0, sizeof(LIBSSH2_CHANNEL));
-
                     channel->session = session;
                     channel->channel_type_len = sizeof("forwarded-tcpip") - 1;
                     channel->channel_type = LIBSSH2_ALLOC(session,
@@ -299,14 +297,13 @@ packet_x11_open(LIBSSH2_SESSION * session, unsigned char *data,
 
     if (session->x11) {
         if (x11open_state->state == libssh2_NB_state_allocated) {
-            channel = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_CHANNEL));
+            channel = LIBSSH2_CALLOC(session, sizeof(LIBSSH2_CHANNEL));
             if (!channel) {
                 _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                                "allocate a channel for new connection");
                 failure_code = SSH_OPEN_RESOURCE_SHORTAGE;
                 goto x11_exit;
             }
-            memset(channel, 0, sizeof(LIBSSH2_CHANNEL));
 
             channel->session = session;
             channel->channel_type_len = sizeof("x11") - 1;

src/publickey.c

@@ -350,13 +350,12 @@ static LIBSSH2_PUBLICKEY *publickey_init(LIBSSH2_SESSION *session)
         }
 
         session->pkeyInit_pkey =
-            LIBSSH2_ALLOC(session, sizeof(LIBSSH2_PUBLICKEY));
+            LIBSSH2_CALLOC(session, sizeof(LIBSSH2_PUBLICKEY));
         if (!session->pkeyInit_pkey) {
             _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                            "Unable to allocate a new publickey structure");
             goto err_exit;
         }
-        memset(session->pkeyInit_pkey, 0, sizeof(LIBSSH2_PUBLICKEY));
         session->pkeyInit_pkey->channel = session->pkeyInit_channel;
         session->pkeyInit_pkey->version = 0;
 

src/sftp.c

@@ -1,6 +1,6 @@
 /* Copyright (c) 2004-2008, Sara Golemon <sarag@libssh2.org>
  * Copyright (c) 2007 Eli Fant <elifantu@mail.ru>
- * Copyright (c) 2009-2013 by Daniel Stenberg
+ * Copyright (c) 2009-2014 by Daniel Stenberg
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms,
@@ -781,13 +781,12 @@ static LIBSSH2_SFTP *sftp_init(LIBSSH2_SESSION *session)
 
         sftp_handle =
             session->sftpInit_sftp =
-            LIBSSH2_ALLOC(session, sizeof(LIBSSH2_SFTP));
+            LIBSSH2_CALLOC(session, sizeof(LIBSSH2_SFTP));
         if (!sftp_handle) {
             _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                            "Unable to allocate a new SFTP structure");
             goto sftp_init_error;
         }
-        memset(sftp_handle, 0, sizeof(LIBSSH2_SFTP));
         sftp_handle->channel = session->sftpInit_channel;
         sftp_handle->request_id = 0;
 
@@ -1173,14 +1172,13 @@ sftp_open(LIBSSH2_SFTP *sftp, const char *filename,
             return NULL;
         }
 
-        fp = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_SFTP_HANDLE));
+        fp = LIBSSH2_CALLOC(session, sizeof(LIBSSH2_SFTP_HANDLE));
         if (!fp) {
             _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                            "Unable to allocate new SFTP handle structure");
             LIBSSH2_FREE(session, data);
             return NULL;
         }
-        memset(fp, 0, sizeof(LIBSSH2_SFTP_HANDLE));
         fp->handle_type = open_file ? LIBSSH2_SFTP_HANDLE_FILE :
             LIBSSH2_SFTP_HANDLE_DIR;
 

src/userauth.c

@@ -1501,32 +1501,26 @@ userauth_keyboard_interactive(LIBSSH2_SESSION * session,
 
             if(session->userauth_kybd_num_prompts) {
                 session->userauth_kybd_prompts =
-                    LIBSSH2_ALLOC(session,
+                    LIBSSH2_CALLOC(session,
-                                  sizeof(LIBSSH2_USERAUTH_KBDINT_PROMPT) *
+                                   sizeof(LIBSSH2_USERAUTH_KBDINT_PROMPT) *
-                                  session->userauth_kybd_num_prompts);
+                                   session->userauth_kybd_num_prompts);
                 if (!session->userauth_kybd_prompts) {
                     _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                                    "Unable to allocate memory for "
                                    "keyboard-interactive prompts array");
                     goto cleanup;
                 }
-                memset(session->userauth_kybd_prompts, 0,
-                       sizeof(LIBSSH2_USERAUTH_KBDINT_PROMPT) *
-                       session->userauth_kybd_num_prompts);
 
                 session->userauth_kybd_responses =
-                    LIBSSH2_ALLOC(session,
+                    LIBSSH2_CALLOC(session,
-                                  sizeof(LIBSSH2_USERAUTH_KBDINT_RESPONSE) *
+                                   sizeof(LIBSSH2_USERAUTH_KBDINT_RESPONSE) *
-                                  session->userauth_kybd_num_prompts);
+                                   session->userauth_kybd_num_prompts);
                 if (!session->userauth_kybd_responses) {
                     _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                                    "Unable to allocate memory for "
                                    "keyboard-interactive responses array");
                     goto cleanup;
                 }
-                memset(session->userauth_kybd_responses, 0,
-                       sizeof(LIBSSH2_USERAUTH_KBDINT_RESPONSE) *
-                       session->userauth_kybd_num_prompts);
 
                 for(i = 0; i != session->userauth_kybd_num_prompts; ++i) {
                     /* string    prompt[1] (ISO-10646 UTF-8) */
@@ -1534,16 +1528,14 @@ userauth_keyboard_interactive(LIBSSH2_SESSION * session,
                         _libssh2_ntohu32(s);
                     s += 4;
                     session->userauth_kybd_prompts[i].text =
-                        LIBSSH2_ALLOC(session,
+                        LIBSSH2_CALLOC(session,
-                                      session->userauth_kybd_prompts[i].length);
+                                       session->userauth_kybd_prompts[i].length);
                     if (!session->userauth_kybd_prompts[i].text) {
                         _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                                        "Unable to allocate memory for "
                                        "keyboard-interactive prompt message");
                         goto cleanup;
                     }
-                    memcpy(session->userauth_kybd_prompts[i].text, s,
-                           session->userauth_kybd_prompts[i].length);
                     s += session->userauth_kybd_prompts[i].length;
 
                     /* boolean   echo[1] */