Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

  f871de0... build: make use of 76 lib/*.h renamed files
  ffd8e12... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

  c087374... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

  13606bb... build: make use of 93 lib/*.c renamed files
  5b6e792... build: rename 93 lib/*.c files
  7d83dff... build: commit 13606bbfde follow-up 1

Start of related discussion thread:

  http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

  http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

  http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

  lib/curl_imap.h
  lib/curl_smtp.h

1 files changed, 897 insertions, 0 deletions

diff --git a/lib/easy.c b/lib/easy.c
new file mode 100644
index 000000000..b73bf6601
--- /dev/null
+++ b/lib/easy.c
@@ -0,0 +1,897 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "setup.h"
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#ifdef HAVE_NET_IF_H
+#include <net/if.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#include "strequal.h"
+#include "urldata.h"
+#include <curl/curl.h>
+#include "transfer.h"
+#include "sslgen.h"
+#include "url.h"
+#include "getinfo.h"
+#include "hostip.h"
+#include "share.h"
+#include "strdup.h"
+#include "curl_memory.h"
+#include "progress.h"
+#include "easyif.h"
+#include "select.h"
+#include "sendf.h" /* for failf function prototype */
+#include "curl_ntlm.h"
+#include "connect.h" /* for Curl_getconnectinfo */
+#include "slist.h"
+#include "amigaos.h"
+#include "curl_rand.h"
+#include "non-ascii.h"
+#include "warnless.h"
+#include "conncache.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/* win32_cleanup() is for win32 socket cleanup functionality, the opposite
+   of win32_init() */
+static void win32_cleanup(void)
+{
+#ifdef USE_WINSOCK
+  WSACleanup();
+#endif
+#ifdef USE_WINDOWS_SSPI
+  Curl_sspi_global_cleanup();
+#endif
+}
+
+/* win32_init() performs win32 socket initialization to properly setup the
+   stack to allow networking */
+static CURLcode win32_init(void)
+{
+#ifdef USE_WINSOCK
+  WORD wVersionRequested;
+  WSADATA wsaData;
+  int res;
+
+#if defined(ENABLE_IPV6) && (USE_WINSOCK < 2)
+  Error IPV6_requires_winsock2
+#endif
+
+  wVersionRequested = MAKEWORD(USE_WINSOCK, USE_WINSOCK);
+
+  res = WSAStartup(wVersionRequested, &wsaData);
+
+  if(res != 0)
+    /* Tell the user that we couldn't find a useable */
+    /* winsock.dll.     */
+    return CURLE_FAILED_INIT;
+
+  /* Confirm that the Windows Sockets DLL supports what we need.*/
+  /* Note that if the DLL supports versions greater */
+  /* than wVersionRequested, it will still return */
+  /* wVersionRequested in wVersion. wHighVersion contains the */
+  /* highest supported version. */
+
+  if(LOBYTE( wsaData.wVersion ) != LOBYTE(wVersionRequested) ||
+     HIBYTE( wsaData.wVersion ) != HIBYTE(wVersionRequested) ) {
+    /* Tell the user that we couldn't find a useable */
+
+    /* winsock.dll. */
+    WSACleanup();
+    return CURLE_FAILED_INIT;
+  }
+  /* The Windows Sockets DLL is acceptable. Proceed. */
+#elif defined(USE_LWIPSOCK)
+  lwip_init();
+#endif
+
+#ifdef USE_WINDOWS_SSPI
+  {
+    CURLcode err = Curl_sspi_global_init();
+    if(err != CURLE_OK)
+      return err;
+  }
+#endif
+
+  return CURLE_OK;
+}
+
+#ifdef USE_LIBIDN
+/*
+ * Initialise use of IDNA library.
+ * It falls back to ASCII if $CHARSET isn't defined. This doesn't work for
+ * idna_to_ascii_lz().
+ */
+static void idna_init (void)
+{
+#ifdef WIN32
+  char buf[60];
+  UINT cp = GetACP();
+
+  if(!getenv("CHARSET") && cp > 0) {
+    snprintf(buf, sizeof(buf), "CHARSET=cp%u", cp);
+    putenv(buf);
+  }
+#else
+  /* to do? */
+#endif
+}
+#endif  /* USE_LIBIDN */
+
+/* true globals -- for curl_global_init() and curl_global_cleanup() */
+static unsigned int  initialized;
+static long          init_flags;
+
+/*
+ * strdup (and other memory functions) is redefined in complicated
+ * ways, but at this point it must be defined as the system-supplied strdup
+ * so the callback pointer is initialized correctly.
+ */
+#if defined(_WIN32_WCE)
+#define system_strdup _strdup
+#elif !defined(HAVE_STRDUP)
+#define system_strdup curlx_strdup
+#else
+#define system_strdup strdup
+#endif
+
+#if defined(_MSC_VER) && defined(_DLL) && !defined(__POCC__)
+#  pragma warning(disable:4232) /* MSVC extension, dllimport identity */
+#endif
+
+#ifndef __SYMBIAN32__
+/*
+ * If a memory-using function (like curl_getenv) is used before
+ * curl_global_init() is called, we need to have these pointers set already.
+ */
+curl_malloc_callback Curl_cmalloc = (curl_malloc_callback)malloc;
+curl_free_callback Curl_cfree = (curl_free_callback)free;
+curl_realloc_callback Curl_crealloc = (curl_realloc_callback)realloc;
+curl_strdup_callback Curl_cstrdup = (curl_strdup_callback)system_strdup;
+curl_calloc_callback Curl_ccalloc = (curl_calloc_callback)calloc;
+#else
+/*
+ * Symbian OS doesn't support initialization to code in writeable static data.
+ * Initialization will occur in the curl_global_init() call.
+ */
+curl_malloc_callback Curl_cmalloc;
+curl_free_callback Curl_cfree;
+curl_realloc_callback Curl_crealloc;
+curl_strdup_callback Curl_cstrdup;
+curl_calloc_callback Curl_ccalloc;
+#endif
+
+#if defined(_MSC_VER) && defined(_DLL) && !defined(__POCC__)
+#  pragma warning(default:4232) /* MSVC extension, dllimport identity */
+#endif
+
+/**
+ * curl_global_init() globally initializes cURL given a bitwise set of the
+ * different features of what to initialize.
+ */
+CURLcode curl_global_init(long flags)
+{
+  if(initialized++)
+    return CURLE_OK;
+
+  /* Setup the default memory functions here (again) */
+  Curl_cmalloc = (curl_malloc_callback)malloc;
+  Curl_cfree = (curl_free_callback)free;
+  Curl_crealloc = (curl_realloc_callback)realloc;
+  Curl_cstrdup = (curl_strdup_callback)system_strdup;
+  Curl_ccalloc = (curl_calloc_callback)calloc;
+
+  if(flags & CURL_GLOBAL_SSL)
+    if(!Curl_ssl_init()) {
+      DEBUGF(fprintf(stderr, "Error: Curl_ssl_init failed\n"));
+      return CURLE_FAILED_INIT;
+    }
+
+  if(flags & CURL_GLOBAL_WIN32)
+    if(win32_init() != CURLE_OK) {
+      DEBUGF(fprintf(stderr, "Error: win32_init failed\n"));
+      return CURLE_FAILED_INIT;
+    }
+
+#ifdef __AMIGA__
+  if(!Curl_amiga_init()) {
+    DEBUGF(fprintf(stderr, "Error: Curl_amiga_init failed\n"));
+    return CURLE_FAILED_INIT;
+  }
+#endif
+
+#ifdef NETWARE
+  if(netware_init()) {
+    DEBUGF(fprintf(stderr, "Warning: LONG namespace not available\n"));
+  }
+#endif
+
+#ifdef USE_LIBIDN
+  idna_init();
+#endif
+
+  if(Curl_resolver_global_init() != CURLE_OK) {
+    DEBUGF(fprintf(stderr, "Error: resolver_global_init failed\n"));
+    return CURLE_FAILED_INIT;
+  }
+
+#if defined(USE_LIBSSH2) && defined(HAVE_LIBSSH2_INIT)
+  if(libssh2_init(0)) {
+    DEBUGF(fprintf(stderr, "Error: libssh2_init failed\n"));
+    return CURLE_FAILED_INIT;
+  }
+#endif
+
+  init_flags  = flags;
+
+  /* Preset pseudo-random number sequence. */
+
+  Curl_srand();
+
+  return CURLE_OK;
+}
+
+/*
+ * curl_global_init_mem() globally initializes cURL and also registers the
+ * user provided callback routines.
+ */
+CURLcode curl_global_init_mem(long flags, curl_malloc_callback m,
+                              curl_free_callback f, curl_realloc_callback r,
+                              curl_strdup_callback s, curl_calloc_callback c)
+{
+  CURLcode code = CURLE_OK;
+
+  /* Invalid input, return immediately */
+  if(!m || !f || !r || !s || !c)
+    return CURLE_FAILED_INIT;
+
+  /* Already initialized, don't do it again */
+  if(initialized)
+    return CURLE_OK;
+
+  /* Call the actual init function first */
+  code = curl_global_init(flags);
+  if(code == CURLE_OK) {
+    Curl_cmalloc = m;
+    Curl_cfree = f;
+    Curl_cstrdup = s;
+    Curl_crealloc = r;
+    Curl_ccalloc = c;
+  }
+
+  return code;
+}
+
+/**
+ * curl_global_cleanup() globally cleanups cURL, uses the value of
+ * "init_flags" to determine what needs to be cleaned up and what doesn't.
+ */
+void curl_global_cleanup(void)
+{
+  if(!initialized)
+    return;
+
+  if(--initialized)
+    return;
+
+  Curl_global_host_cache_dtor();
+
+  if(init_flags & CURL_GLOBAL_SSL)
+    Curl_ssl_cleanup();
+
+  Curl_resolver_global_cleanup();
+
+  if(init_flags & CURL_GLOBAL_WIN32)
+    win32_cleanup();
+
+  Curl_amiga_cleanup();
+
+#if defined(USE_LIBSSH2) && defined(HAVE_LIBSSH2_EXIT)
+  (void)libssh2_exit();
+#endif
+
+  init_flags  = 0;
+}
+
+/*
+ * curl_easy_init() is the external interface to alloc, setup and init an
+ * easy handle that is returned. If anything goes wrong, NULL is returned.
+ */
+CURL *curl_easy_init(void)
+{
+  CURLcode res;
+  struct SessionHandle *data;
+
+  /* Make sure we inited the global SSL stuff */
+  if(!initialized) {
+    res = curl_global_init(CURL_GLOBAL_DEFAULT);
+    if(res) {
+      /* something in the global init failed, return nothing */
+      DEBUGF(fprintf(stderr, "Error: curl_global_init failed\n"));
+      return NULL;
+    }
+  }
+
+  /* We use curl_open() with undefined URL so far */
+  res = Curl_open(&data);
+  if(res != CURLE_OK) {
+    DEBUGF(fprintf(stderr, "Error: Curl_open failed\n"));
+    return NULL;
+  }
+
+  return data;
+}
+
+/*
+ * curl_easy_setopt() is the external interface for setting options on an
+ * easy handle.
+ */
+
+#undef curl_easy_setopt
+CURLcode curl_easy_setopt(CURL *curl, CURLoption tag, ...)
+{
+  va_list arg;
+  struct SessionHandle *data = curl;
+  CURLcode ret;
+
+  if(!curl)
+    return CURLE_BAD_FUNCTION_ARGUMENT;
+
+  va_start(arg, tag);
+
+  ret = Curl_setopt(data, tag, arg);
+
+  va_end(arg);
+  return ret;
+}
+
+#ifdef CURL_MULTIEASY
+/***************************************************************************
+ * This function is still only for testing purposes. It makes a great way
+ * to run the full test suite on the multi interface instead of the easy one.
+ ***************************************************************************
+ *
+ * The *new* curl_easy_perform() is the external interface that performs a
+ * transfer previously setup.
+ *
+ * Wrapper-function that: creates a multi handle, adds the easy handle to it,
+ * runs curl_multi_perform() until the transfer is done, then detaches the
+ * easy handle, destroys the multi handle and returns the easy handle's return
+ * code. This will make everything internally use and assume multi interface.
+ */
+CURLcode curl_easy_perform(CURL *easy)
+{
+  CURLM *multi;
+  CURLMcode mcode;
+  CURLcode code = CURLE_OK;
+  int still_running;
+  struct timeval timeout;
+  int rc;
+  CURLMsg *msg;
+  fd_set fdread;
+  fd_set fdwrite;
+  fd_set fdexcep;
+  int maxfd;
+
+  if(!easy)
+    return CURLE_BAD_FUNCTION_ARGUMENT;
+
+  multi = curl_multi_init();
+  if(!multi)
+    return CURLE_OUT_OF_MEMORY;
+
+  mcode = curl_multi_add_handle(multi, easy);
+  if(mcode) {
+    curl_multi_cleanup(multi);
+    if(mcode == CURLM_OUT_OF_MEMORY)
+      return CURLE_OUT_OF_MEMORY;
+    else
+      return CURLE_FAILED_INIT;
+  }
+
+  /* we start some action by calling perform right away */
+
+  do {
+    while(CURLM_CALL_MULTI_PERFORM ==
+          curl_multi_perform(multi, &still_running));
+
+    if(!still_running)
+      break;
+
+    FD_ZERO(&fdread);
+    FD_ZERO(&fdwrite);
+    FD_ZERO(&fdexcep);
+
+    /* timeout once per second */
+    timeout.tv_sec = 1;
+    timeout.tv_usec = 0;
+
+    /* Old deprecated style: get file descriptors from the transfers */
+    curl_multi_fdset(multi, &fdread, &fdwrite, &fdexcep, &maxfd);
+    rc = Curl_select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+
+    /* The way is to extract the sockets and wait for them without using
+       select. This whole alternative version should probably rather use the
+       curl_multi_socket() approach. */
+
+    if(rc == -1)
+      /* select error */
+      break;
+
+    /* timeout or data to send/receive => loop! */
+  } while(still_running);
+
+  msg = curl_multi_info_read(multi, &rc);
+  if(msg)
+    code = msg->data.result;
+
+  mcode = curl_multi_remove_handle(multi, easy);
+  /* what to do if it fails? */
+
+  mcode = curl_multi_cleanup(multi);
+  /* what to do if it fails? */
+
+  return code;
+}
+#else
+/*
+ * curl_easy_perform() is the external interface that performs a transfer
+ * previously setup.
+ */
+CURLcode curl_easy_perform(CURL *curl)
+{
+  struct SessionHandle *data = (struct SessionHandle *)curl;
+
+  if(!data)
+    return CURLE_BAD_FUNCTION_ARGUMENT;
+
+  if(! (data->share && data->share->hostcache)) {
+    /* this handle is not using a shared dns cache */
+
+    if(data->set.global_dns_cache &&
+       (data->dns.hostcachetype != HCACHE_GLOBAL)) {
+      /* global dns cache was requested but still isn't */
+      struct curl_hash *ptr;
+
+      if(data->dns.hostcachetype == HCACHE_PRIVATE) {
+        /* if the current cache is private, kill it first */
+        Curl_hash_destroy(data->dns.hostcache);
+        data->dns.hostcachetype = HCACHE_NONE;
+        data->dns.hostcache = NULL;
+      }
+
+      ptr = Curl_global_host_cache_init();
+      if(ptr) {
+        /* only do this if the global cache init works */
+        data->dns.hostcache = ptr;
+        data->dns.hostcachetype = HCACHE_GLOBAL;
+      }
+    }
+
+    if(!data->dns.hostcache) {
+      data->dns.hostcachetype = HCACHE_PRIVATE;
+      data->dns.hostcache = Curl_mk_dnscache();
+
+      if(!data->dns.hostcache)
+        /* While we possibly could survive and do good without a host cache,
+           the fact that creating it failed indicates that things are truly
+           screwed up and we should bail out! */
+        return CURLE_OUT_OF_MEMORY;
+    }
+
+  }
+
+  if(!data->state.conn_cache) {
+    /* Oops, no connection cache, create one */
+    data->state.conn_cache = Curl_conncache_init(CONNCACHE_PRIVATE);
+    if(!data->state.conn_cache)
+      return CURLE_OUT_OF_MEMORY;
+  }
+
+  return Curl_perform(data);
+}
+#endif
+
+/*
+ * curl_easy_cleanup() is the external interface to cleaning/freeing the given
+ * easy handle.
+ */
+void curl_easy_cleanup(CURL *curl)
+{
+  struct SessionHandle *data = (struct SessionHandle *)curl;
+
+  if(!data)
+    return;
+
+  Curl_close(data);
+}
+
+/*
+ * Store a pointed to the multi handle within the easy handle's data struct.
+ */
+void Curl_easy_addmulti(struct SessionHandle *data,
+                        void *multi)
+{
+  data->multi = multi;
+  if(multi == NULL)
+    /* the association is cleared, mark the easy handle as not used by an
+       interface */
+    data->state.used_interface = Curl_if_none;
+}
+
+void Curl_easy_initHandleData(struct SessionHandle *data)
+{
+    memset(&data->req, 0, sizeof(struct SingleRequest));
+
+    data->req.maxdownload = -1;
+}
+
+/*
+ * curl_easy_getinfo() is an external interface that allows an app to retrieve
+ * information from a performed transfer and similar.
+ */
+#undef curl_easy_getinfo
+CURLcode curl_easy_getinfo(CURL *curl, CURLINFO info, ...)
+{
+  va_list arg;
+  void *paramp;
+  struct SessionHandle *data = (struct SessionHandle *)curl;
+
+  va_start(arg, info);
+  paramp = va_arg(arg, void *);
+
+  return Curl_getinfo(data, info, paramp);
+}
+
+/*
+ * curl_easy_duphandle() is an external interface to allow duplication of a
+ * given input easy handle. The returned handle will be a new working handle
+ * with all options set exactly as the input source handle.
+ */
+CURL *curl_easy_duphandle(CURL *incurl)
+{
+  struct SessionHandle *data=(struct SessionHandle *)incurl;
+
+  struct SessionHandle *outcurl = calloc(1, sizeof(struct SessionHandle));
+  if(NULL == outcurl)
+    goto fail;
+
+  /*
+   * We setup a few buffers we need. We should probably make them
+   * get setup on-demand in the code, as that would probably decrease
+   * the likeliness of us forgetting to init a buffer here in the future.
+   */
+  outcurl->state.headerbuff = malloc(HEADERSIZE);
+  if(!outcurl->state.headerbuff)
+    goto fail;
+  outcurl->state.headersize = HEADERSIZE;
+
+  /* copy all userdefined values */
+  if(Curl_dupset(outcurl, data) != CURLE_OK)
+    goto fail;
+
+  /* the connection cache is setup on demand */
+  outcurl->state.conn_cache = NULL;
+
+  outcurl->state.lastconnect = NULL;
+
+  outcurl->progress.flags    = data->progress.flags;
+  outcurl->progress.callback = data->progress.callback;
+
+  if(data->cookies) {
+    /* If cookies are enabled in the parent handle, we enable them
+       in the clone as well! */
+    outcurl->cookies = Curl_cookie_init(data,
+                                        data->cookies->filename,
+                                        outcurl->cookies,
+                                        data->set.cookiesession);
+    if(!outcurl->cookies)
+      goto fail;
+  }
+
+  /* duplicate all values in 'change' */
+  if(data->change.cookielist) {
+    outcurl->change.cookielist =
+      Curl_slist_duplicate(data->change.cookielist);
+    if(!outcurl->change.cookielist)
+      goto fail;
+  }
+
+  if(data->change.url) {
+    outcurl->change.url = strdup(data->change.url);
+    if(!outcurl->change.url)
+      goto fail;
+    outcurl->change.url_alloc = TRUE;
+  }
+
+  if(data->change.referer) {
+    outcurl->change.referer = strdup(data->change.referer);
+    if(!outcurl->change.referer)
+      goto fail;
+    outcurl->change.referer_alloc = TRUE;
+  }
+
+  /* Clone the resolver handle, if present, for the new handle */
+  if(Curl_resolver_duphandle(&outcurl->state.resolver,
+                             data->state.resolver) != CURLE_OK)
+    goto fail;
+
+  Curl_convert_setup(outcurl);
+
+  Curl_easy_initHandleData(outcurl);
+
+  outcurl->magic = CURLEASY_MAGIC_NUMBER;
+
+  /* we reach this point and thus we are OK */
+
+  return outcurl;
+
+  fail:
+
+  if(outcurl) {
+    curl_slist_free_all(outcurl->change.cookielist);
+    outcurl->change.cookielist = NULL;
+    Curl_safefree(outcurl->state.headerbuff);
+    Curl_safefree(outcurl->change.url);
+    Curl_safefree(outcurl->change.referer);
+    Curl_freeset(outcurl);
+    free(outcurl);
+  }
+
+  return NULL;
+}
+
+/*
+ * curl_easy_reset() is an external interface that allows an app to re-
+ * initialize a session handle to the default values.
+ */
+void curl_easy_reset(CURL *curl)
+{
+  struct SessionHandle *data = (struct SessionHandle *)curl;
+
+  Curl_safefree(data->state.pathbuffer);
+
+  data->state.path = NULL;
+
+  Curl_safefree(data->state.proto.generic);
+
+  /* zero out UserDefined data: */
+  Curl_freeset(data);
+  memset(&data->set, 0, sizeof(struct UserDefined));
+  (void)Curl_init_userdefined(&data->set);
+
+  /* zero out Progress data: */
+  memset(&data->progress, 0, sizeof(struct Progress));
+
+  /* init Handle data */
+  Curl_easy_initHandleData(data);
+
+  data->progress.flags |= PGRS_HIDE;
+  data->state.current_speed = -1; /* init to negative == impossible */
+}
+
+/*
+ * curl_easy_pause() allows an application to pause or unpause a specific
+ * transfer and direction. This function sets the full new state for the
+ * current connection this easy handle operates on.
+ *
+ * NOTE: if you have the receiving paused and you call this function to remove
+ * the pausing, you may get your write callback called at this point.
+ *
+ * Action is a bitmask consisting of CURLPAUSE_* bits in curl/curl.h
+ */
+CURLcode curl_easy_pause(CURL *curl, int action)
+{
+  struct SessionHandle *data = (struct SessionHandle *)curl;
+  struct SingleRequest *k = &data->req;
+  CURLcode result = CURLE_OK;
+
+  /* first switch off both pause bits */
+  int newstate = k->keepon &~ (KEEP_RECV_PAUSE| KEEP_SEND_PAUSE);
+
+  /* set the new desired pause bits */
+  newstate |= ((action & CURLPAUSE_RECV)?KEEP_RECV_PAUSE:0) |
+    ((action & CURLPAUSE_SEND)?KEEP_SEND_PAUSE:0);
+
+  /* put it back in the keepon */
+  k->keepon = newstate;
+
+  if(!(newstate & KEEP_RECV_PAUSE) && data->state.tempwrite) {
+    /* we have a buffer for sending that we now seem to be able to deliver
+       since the receive pausing is lifted! */
+
+    /* get the pointer, type and length in local copies since the function may
+       return PAUSE again and then we'll get a new copy allocted and stored in
+       the tempwrite variables */
+    char *tempwrite = data->state.tempwrite;
+    char *freewrite = tempwrite; /* store this pointer to free it later */
+    size_t tempsize = data->state.tempwritesize;
+    int temptype = data->state.tempwritetype;
+    size_t chunklen;
+
+    /* clear tempwrite here just to make sure it gets cleared if there's no
+       further use of it, and make sure we don't clear it after the function
+       invoke as it may have been set to a new value by then */
+    data->state.tempwrite = NULL;
+
+    /* since the write callback API is define to never exceed
+       CURL_MAX_WRITE_SIZE bytes in a single call, and since we may in fact
+       have more data than that in our buffer here, we must loop sending the
+       data in multiple calls until there's no data left or we get another
+       pause returned.
+
+       A tricky part is that the function we call will "buffer" the data
+       itself when it pauses on a particular buffer, so we may need to do some
+       extra trickery if we get a pause return here.
+    */
+    do {
+      chunklen = (tempsize > CURL_MAX_WRITE_SIZE)?CURL_MAX_WRITE_SIZE:tempsize;
+
+      result = Curl_client_write(data->state.current_conn,
+                                 temptype, tempwrite, chunklen);
+      if(result)
+        /* failures abort the loop at once */
+        break;
+
+      if(data->state.tempwrite && (tempsize - chunklen)) {
+        /* Ouch, the reading is again paused and the block we send is now
+           "cached". If this is the final chunk we can leave it like this, but
+           if we have more chunks that are cached after this, we need to free
+           the newly cached one and put back a version that is truly the entire
+           contents that is saved for later
+        */
+        char *newptr;
+
+        /* note that tempsize is still the size as before the callback was
+           used, and thus the whole piece of data to keep */
+        newptr = realloc(data->state.tempwrite, tempsize);
+
+        if(!newptr) {
+          free(data->state.tempwrite); /* free old area */
+          data->state.tempwrite = NULL;
+          result = CURLE_OUT_OF_MEMORY;
+          /* tempwrite will be freed further down */
+          break;
+        }
+        data->state.tempwrite = newptr; /* store new pointer */
+        memcpy(newptr, tempwrite, tempsize);
+        data->state.tempwritesize = tempsize; /* store new size */
+        /* tempwrite will be freed further down */
+        break; /* go back to pausing until further notice */
+      }
+      else {
+        tempsize -= chunklen;  /* left after the call above */
+        tempwrite += chunklen; /* advance the pointer */
+      }
+
+    } while((result == CURLE_OK) && tempsize);
+
+    free(freewrite); /* this is unconditionally no longer used */
+  }
+
+  return result;
+}
+
+
+static CURLcode easy_connection(struct SessionHandle *data,
+                                curl_socket_t *sfd,
+                                struct connectdata **connp)
+{
+  if(data == NULL)
+    return CURLE_BAD_FUNCTION_ARGUMENT;
+
+  /* only allow these to be called on handles with CURLOPT_CONNECT_ONLY */
+  if(!data->set.connect_only) {
+    failf(data, "CONNECT_ONLY is required!");
+    return CURLE_UNSUPPORTED_PROTOCOL;
+  }
+
+  *sfd = Curl_getconnectinfo(data, connp);
+
+  if(*sfd == CURL_SOCKET_BAD) {
+    failf(data, "Failed to get recent socket");
+    return CURLE_UNSUPPORTED_PROTOCOL;
+  }
+
+  return CURLE_OK;
+}
+
+/*
+ * Receives data from the connected socket. Use after successful
+ * curl_easy_perform() with CURLOPT_CONNECT_ONLY option.
+ * Returns CURLE_OK on success, error code on error.
+ */
+CURLcode curl_easy_recv(CURL *curl, void *buffer, size_t buflen, size_t *n)
+{
+  curl_socket_t sfd;
+  CURLcode ret;
+  ssize_t n1;
+  struct connectdata *c;
+  struct SessionHandle *data = (struct SessionHandle *)curl;
+
+  ret = easy_connection(data, &sfd, &c);
+  if(ret)
+    return ret;
+
+  *n = 0;
+  ret = Curl_read(c, sfd, buffer, buflen, &n1);
+
+  if(ret != CURLE_OK)
+    return ret;
+
+  *n = (size_t)n1;
+
+  return CURLE_OK;
+}
+
+/*
+ * Sends data over the connected socket. Use after successful
+ * curl_easy_perform() with CURLOPT_CONNECT_ONLY option.
+ */
+CURLcode curl_easy_send(CURL *curl, const void *buffer, size_t buflen,
+                        size_t *n)
+{
+  curl_socket_t sfd;
+  CURLcode ret;
+  ssize_t n1;
+  struct connectdata *c = NULL;
+  struct SessionHandle *data = (struct SessionHandle *)curl;
+
+  ret = easy_connection(data, &sfd, &c);
+  if(ret)
+    return ret;
+
+  *n = 0;
+  ret = Curl_write(c, sfd, buffer, buflen, &n1);
+
+  if(n1 == -1)
+    return CURLE_SEND_ERROR;
+
+  /* detect EAGAIN */
+  if((CURLE_OK == ret) && (0 == n1))
+    return CURLE_AGAIN;
+
+  *n = (size_t)n1;
+
+  return ret;
+}