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, 679 insertions, 0 deletions

diff --git a/lib/asyn-thread.c b/lib/asyn-thread.c
new file mode 100644
index 000000000..0d29d5887
--- /dev/null
+++ b/lib/asyn-thread.c
@@ -0,0 +1,679 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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 __VMS
+#include <in.h>
+#include <inet.h>
+#endif
+
+#if defined(USE_THREADS_POSIX)
+#  ifdef HAVE_PTHREAD_H
+#    include <pthread.h>
+#  endif
+#elif defined(USE_THREADS_WIN32)
+#  ifdef HAVE_PROCESS_H
+#    include <process.h>
+#  endif
+#endif
+
+#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
+#undef in_addr_t
+#define in_addr_t unsigned long
+#endif
+
+#ifdef HAVE_GETADDRINFO
+#  define RESOLVER_ENOMEM  EAI_MEMORY
+#else
+#  define RESOLVER_ENOMEM  ENOMEM
+#endif
+
+#include "urldata.h"
+#include "sendf.h"
+#include "hostip.h"
+#include "hash.h"
+#include "share.h"
+#include "strerror.h"
+#include "url.h"
+#include "multiif.h"
+#include "inet_pton.h"
+#include "inet_ntop.h"
+#include "curl_threads.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+#include "curl_memory.h"
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/***********************************************************************
+ * Only for threaded name resolves builds
+ **********************************************************************/
+#ifdef CURLRES_THREADED
+
+/*
+ * Curl_resolver_global_init()
+ * Called from curl_global_init() to initialize global resolver environment.
+ * Does nothing here.
+ */
+int Curl_resolver_global_init(void)
+{
+  return CURLE_OK;
+}
+
+/*
+ * Curl_resolver_global_cleanup()
+ * Called from curl_global_cleanup() to destroy global resolver environment.
+ * Does nothing here.
+ */
+void Curl_resolver_global_cleanup(void)
+{
+}
+
+/*
+ * Curl_resolver_init()
+ * Called from curl_easy_init() -> Curl_open() to initialize resolver
+ * URL-state specific environment ('resolver' member of the UrlState
+ * structure).  Does nothing here.
+ */
+CURLcode Curl_resolver_init(void **resolver)
+{
+  (void)resolver;
+  return CURLE_OK;
+}
+
+/*
+ * Curl_resolver_cleanup()
+ * Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
+ * URL-state specific environment ('resolver' member of the UrlState
+ * structure).  Does nothing here.
+ */
+void Curl_resolver_cleanup(void *resolver)
+{
+  (void)resolver;
+}
+
+/*
+ * Curl_resolver_duphandle()
+ * Called from curl_easy_duphandle() to duplicate resolver URL state-specific
+ * environment ('resolver' member of the UrlState structure).  Does nothing
+ * here.
+ */
+int Curl_resolver_duphandle(void **to, void *from)
+{
+  (void)to;
+  (void)from;
+  return CURLE_OK;
+}
+
+static void destroy_async_data(struct Curl_async *);
+
+/*
+ * Cancel all possibly still on-going resolves for this connection.
+ */
+void Curl_resolver_cancel(struct connectdata *conn)
+{
+  destroy_async_data(&conn->async);
+}
+
+/* This function is used to init a threaded resolve */
+static bool init_resolve_thread(struct connectdata *conn,
+                                const char *hostname, int port,
+                                const struct addrinfo *hints);
+
+
+/* Data for synchronization between resolver thread and its parent */
+struct thread_sync_data {
+  curl_mutex_t * mtx;
+  int done;
+
+  char * hostname;        /* hostname to resolve, Curl_async.hostname
+                             duplicate */
+  int port;
+  int sock_error;
+  Curl_addrinfo *res;
+#ifdef HAVE_GETADDRINFO
+  struct addrinfo hints;
+#endif
+};
+
+struct thread_data {
+  curl_thread_t thread_hnd;
+  unsigned int poll_interval;
+  int interval_end;
+  struct thread_sync_data tsd;
+};
+
+static struct thread_sync_data *conn_thread_sync_data(struct connectdata *conn)
+{
+  return &(((struct thread_data *)conn->async.os_specific)->tsd);
+}
+
+#define CONN_THREAD_SYNC_DATA(conn) &(((conn)->async.os_specific)->tsd);
+
+/* Destroy resolver thread synchronization data */
+static
+void destroy_thread_sync_data(struct thread_sync_data * tsd)
+{
+  if(tsd->mtx) {
+    Curl_mutex_destroy(tsd->mtx);
+    free(tsd->mtx);
+  }
+
+  if(tsd->hostname)
+    free(tsd->hostname);
+
+  if(tsd->res)
+    Curl_freeaddrinfo(tsd->res);
+
+  memset(tsd,0,sizeof(*tsd));
+}
+
+/* Initialize resolver thread synchronization data */
+static
+int init_thread_sync_data(struct thread_sync_data * tsd,
+                           const char * hostname,
+                           int port,
+                           const struct addrinfo *hints)
+{
+  memset(tsd, 0, sizeof(*tsd));
+
+  tsd->port = port;
+#ifdef CURLRES_IPV6
+  DEBUGASSERT(hints);
+  tsd->hints = *hints;
+#else
+  (void) hints;
+#endif
+
+  tsd->mtx = malloc(sizeof(curl_mutex_t));
+  if(tsd->mtx == NULL)
+    goto err_exit;
+
+  Curl_mutex_init(tsd->mtx);
+
+  tsd->sock_error = CURL_ASYNC_SUCCESS;
+
+  /* Copying hostname string because original can be destroyed by parent
+   * thread during gethostbyname execution.
+   */
+  tsd->hostname = strdup(hostname);
+  if(!tsd->hostname)
+    goto err_exit;
+
+  return 1;
+
+ err_exit:
+  /* Memory allocation failed */
+  destroy_thread_sync_data(tsd);
+  return 0;
+}
+
+static int getaddrinfo_complete(struct connectdata *conn)
+{
+  struct thread_sync_data *tsd = conn_thread_sync_data(conn);
+  int rc;
+
+  rc = Curl_addrinfo_callback(conn, tsd->sock_error, tsd->res);
+  /* The tsd->res structure has been copied to async.dns and perhaps the DNS
+     cache.  Set our copy to NULL so destroy_thread_sync_data doesn't free it.
+  */
+  tsd->res = NULL;
+
+  return rc;
+}
+
+
+#ifdef HAVE_GETADDRINFO
+
+/*
+ * getaddrinfo_thread() resolves a name and then exits.
+ *
+ * For builds without ARES, but with ENABLE_IPV6, create a resolver thread
+ * and wait on it.
+ */
+static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
+{
+  struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
+  char   service [NI_MAXSERV];
+  int rc;
+
+  snprintf(service, sizeof(service), "%d", tsd->port);
+
+  rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);
+
+  if(rc != 0) {
+    tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;
+    if(tsd->sock_error == 0)
+      tsd->sock_error = RESOLVER_ENOMEM;
+  }
+
+  Curl_mutex_acquire(tsd->mtx);
+  tsd->done = 1;
+  Curl_mutex_release(tsd->mtx);
+
+  return 0;
+}
+
+#else /* HAVE_GETADDRINFO */
+
+/*
+ * gethostbyname_thread() resolves a name and then exits.
+ */
+static unsigned int CURL_STDCALL gethostbyname_thread (void *arg)
+{
+  struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
+
+  tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);
+
+  if(!tsd->res) {
+    tsd->sock_error = SOCKERRNO;
+    if(tsd->sock_error == 0)
+      tsd->sock_error = RESOLVER_ENOMEM;
+  }
+
+  Curl_mutex_acquire(tsd->mtx);
+  tsd->done = 1;
+  Curl_mutex_release(tsd->mtx);
+
+  return 0;
+}
+
+#endif /* HAVE_GETADDRINFO */
+
+/*
+ * destroy_async_data() cleans up async resolver data and thread handle.
+ */
+static void destroy_async_data (struct Curl_async *async)
+{
+  if(async->hostname)
+    free(async->hostname);
+
+  if(async->os_specific) {
+    struct thread_data *td = (struct thread_data*) async->os_specific;
+
+    if(td->thread_hnd != curl_thread_t_null)
+      Curl_thread_join(&td->thread_hnd);
+
+    destroy_thread_sync_data(&td->tsd);
+
+    free(async->os_specific);
+  }
+  async->hostname = NULL;
+  async->os_specific = NULL;
+}
+
+/*
+ * init_resolve_thread() starts a new thread that performs the actual
+ * resolve. This function returns before the resolve is done.
+ *
+ * Returns FALSE in case of failure, otherwise TRUE.
+ */
+static bool init_resolve_thread (struct connectdata *conn,
+                                 const char *hostname, int port,
+                                 const struct addrinfo *hints)
+{
+  struct thread_data *td = calloc(1, sizeof(struct thread_data));
+  int err = RESOLVER_ENOMEM;
+
+  conn->async.os_specific = (void*) td;
+  if(!td)
+    goto err_exit;
+
+  conn->async.port = port;
+  conn->async.done = FALSE;
+  conn->async.status = 0;
+  conn->async.dns = NULL;
+  td->thread_hnd = curl_thread_t_null;
+
+  if(!init_thread_sync_data(&td->tsd, hostname, port, hints))
+    goto err_exit;
+
+  Curl_safefree(conn->async.hostname);
+  conn->async.hostname = strdup(hostname);
+  if(!conn->async.hostname)
+    goto err_exit;
+
+#ifdef HAVE_GETADDRINFO
+  td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);
+#else
+  td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
+#endif
+
+  if(!td->thread_hnd) {
+#ifndef _WIN32_WCE
+    err = errno;
+#endif
+    goto err_exit;
+  }
+
+  return TRUE;
+
+ err_exit:
+  destroy_async_data(&conn->async);
+
+  SET_ERRNO(err);
+
+  return FALSE;
+}
+
+#if defined(HAVE_GETADDRINFO) && !defined(HAVE_GAI_STRERROR) && !defined(WIN32)
+/* NetWare has getaddrinfo but lacks gai_strerror.
+   Windows has a gai_strerror but it is bad (not thread-safe) and the generic
+   socket error string function can be used for this pupose. */
+static const char *gai_strerror(int ecode)
+{
+  switch (ecode) {
+  case EAI_AGAIN:
+    return "The name could not be resolved at this time";
+  case EAI_BADFLAGS:
+    return "The flags parameter had an invalid value";
+  case EAI_FAIL:
+    return "A non-recoverable error occurred when attempting to "
+      "resolve the name";
+  case EAI_FAMILY:
+    return "The address family was not recognized";
+  case EAI_MEMORY:
+    return "Out of memory";
+  case EAI_NONAME:
+    return "The name does not resolve for the supplied parameters";
+  case EAI_SERVICE:
+    return "The service passed was not recognized for the "
+      "specified socket type"
+  case EAI_SOCKTYPE:
+    return "The intended socket type was not recognized"
+  case EAI_SYSTEM:
+    return "A system error occurred";
+  case EAI_OVERFLOW:
+    return "An argument buffer overflowed";
+  default:
+    return "Unknown error";
+
+/* define this now as this is a private implementation of said function */
+#define HAVE_GAI_STRERROR
+}
+#endif
+
+
+/*
+ * resolver_error() calls failf() with the appropriate message after a resolve
+ * error
+ */
+
+static void resolver_error(struct connectdata *conn, const char *host_or_proxy)
+{
+  failf(conn->data, "Could not resolve %s: %s; %s", host_or_proxy,
+        conn->async.hostname,
+#ifdef HAVE_GAI_STRERROR
+        /* NetWare doesn't have gai_strerror and on Windows it isn't deemed
+           thread-safe */
+        gai_strerror(conn->async.status)
+#else
+        Curl_strerror(conn, conn->async.status)
+#endif
+    );
+}
+
+/*
+ * Curl_resolver_wait_resolv()
+ *
+ * waits for a resolve to finish. This function should be avoided since using
+ * this risk getting the multi interface to "hang".
+ *
+ * If 'entry' is non-NULL, make it point to the resolved dns entry
+ *
+ * This is the version for resolves-in-a-thread.
+ */
+CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
+                                   struct Curl_dns_entry **entry)
+{
+  struct thread_data   *td = (struct thread_data*) conn->async.os_specific;
+  CURLcode rc = CURLE_OK;
+
+  DEBUGASSERT(conn && td);
+
+  /* wait for the thread to resolve the name */
+  if(Curl_thread_join(&td->thread_hnd))
+    rc = getaddrinfo_complete(conn);
+  else
+    DEBUGASSERT(0);
+
+  conn->async.done = TRUE;
+
+  if(entry)
+    *entry = conn->async.dns;
+
+  if(!conn->async.dns) {
+    /* a name was not resolved */
+    if(conn->bits.httpproxy) {
+      resolver_error(conn, "proxy");
+      rc = CURLE_COULDNT_RESOLVE_PROXY;
+    }
+    else {
+      resolver_error(conn, "host");
+      rc = CURLE_COULDNT_RESOLVE_HOST;
+    }
+  }
+
+  destroy_async_data(&conn->async);
+
+  if(!conn->async.dns)
+    conn->bits.close = TRUE;
+
+  return (rc);
+}
+
+/*
+ * Curl_resolver_is_resolved() is called repeatedly to check if a previous
+ * name resolve request has completed. It should also make sure to time-out if
+ * the operation seems to take too long.
+ */
+CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
+                                   struct Curl_dns_entry **entry)
+{
+  struct SessionHandle *data = conn->data;
+  struct thread_data   *td = (struct thread_data*) conn->async.os_specific;
+  int done = 0;
+
+  *entry = NULL;
+
+  if(!td) {
+    DEBUGASSERT(td);
+    return CURLE_COULDNT_RESOLVE_HOST;
+  }
+
+  Curl_mutex_acquire(td->tsd.mtx);
+  done = td->tsd.done;
+  Curl_mutex_release(td->tsd.mtx);
+
+  if(done) {
+    getaddrinfo_complete(conn);
+    destroy_async_data(&conn->async);
+
+    if(!conn->async.dns) {
+      resolver_error(conn, "host");
+      return CURLE_COULDNT_RESOLVE_HOST;
+    }
+    *entry = conn->async.dns;
+  }
+  else {
+    /* poll for name lookup done with exponential backoff up to 250ms */
+    int elapsed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);
+    if(elapsed < 0)
+      elapsed = 0;
+
+    if(td->poll_interval == 0)
+      /* Start at 1ms poll interval */
+      td->poll_interval = 1;
+    else if(elapsed >= td->interval_end)
+      /* Back-off exponentially if last interval expired  */
+      td->poll_interval *= 2;
+
+    if(td->poll_interval > 250)
+      td->poll_interval = 250;
+
+    td->interval_end = elapsed + td->poll_interval;
+    Curl_expire(conn->data, td->poll_interval);
+  }
+
+  return CURLE_OK;
+}
+
+int Curl_resolver_getsock(struct connectdata *conn,
+                          curl_socket_t *socks,
+                          int numsocks)
+{
+  (void)conn;
+  (void)socks;
+  (void)numsocks;
+  return 0;
+}
+
+#ifndef HAVE_GETADDRINFO
+/*
+ * Curl_getaddrinfo() - for platforms without getaddrinfo
+ */
+Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
+                                         const char *hostname,
+                                         int port,
+                                         int *waitp)
+{
+  struct in_addr in;
+
+  *waitp = 0; /* default to synchronous response */
+
+  if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
+    /* This is a dotted IP address 123.123.123.123-style */
+    return Curl_ip2addr(AF_INET, &in, hostname, port);
+
+  /* fire up a new resolver thread! */
+  if(init_resolve_thread(conn, hostname, port, NULL)) {
+    *waitp = 1; /* expect asynchronous response */
+    return NULL;
+  }
+
+  /* fall-back to blocking version */
+  return Curl_ipv4_resolve_r(hostname, port);
+}
+
+#else /* !HAVE_GETADDRINFO */
+
+/*
+ * Curl_resolver_getaddrinfo() - for getaddrinfo
+ */
+Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
+                                         const char *hostname,
+                                         int port,
+                                         int *waitp)
+{
+  struct addrinfo hints;
+  struct in_addr in;
+  Curl_addrinfo *res;
+  int error;
+  char sbuf[NI_MAXSERV];
+  int pf = PF_INET;
+#ifdef CURLRES_IPV6
+  struct in6_addr in6;
+#endif /* CURLRES_IPV6 */
+
+  *waitp = 0; /* default to synchronous response */
+
+  /* First check if this is an IPv4 address string */
+  if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
+    /* This is a dotted IP address 123.123.123.123-style */
+    return Curl_ip2addr(AF_INET, &in, hostname, port);
+
+#ifdef CURLRES_IPV6
+  /* check if this is an IPv6 address string */
+  if(Curl_inet_pton (AF_INET6, hostname, &in6) > 0)
+    /* This is an IPv6 address literal */
+    return Curl_ip2addr(AF_INET6, &in6, hostname, port);
+
+  /*
+   * Check if a limited name resolve has been requested.
+   */
+  switch(conn->ip_version) {
+  case CURL_IPRESOLVE_V4:
+    pf = PF_INET;
+    break;
+  case CURL_IPRESOLVE_V6:
+    pf = PF_INET6;
+    break;
+  default:
+    pf = PF_UNSPEC;
+    break;
+  }
+
+  if((pf != PF_INET) && !Curl_ipv6works())
+    /* the stack seems to be a non-ipv6 one */
+    pf = PF_INET;
+
+#endif /* CURLRES_IPV6 */
+
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_family = pf;
+  hints.ai_socktype = conn->socktype;
+
+  snprintf(sbuf, sizeof(sbuf), "%d", port);
+
+  /* fire up a new resolver thread! */
+  if(init_resolve_thread(conn, hostname, port, &hints)) {
+    *waitp = 1; /* expect asynchronous response */
+    return NULL;
+  }
+
+  /* fall-back to blocking version */
+  infof(conn->data, "init_resolve_thread() failed for %s; %s\n",
+        hostname, Curl_strerror(conn, ERRNO));
+
+  error = Curl_getaddrinfo_ex(hostname, sbuf, &hints, &res);
+  if(error) {
+    infof(conn->data, "getaddrinfo() failed for %s:%d; %s\n",
+          hostname, port, Curl_strerror(conn, SOCKERRNO));
+    return NULL;
+  }
+  return res;
+}
+
+#endif /* !HAVE_GETADDRINFO */
+
+CURLcode Curl_set_dns_servers(struct SessionHandle *data,
+                              char *servers)
+{
+  (void)data;
+  (void)servers;
+  return CURLE_NOT_BUILT_IN;
+
+}
+
+#endif /* CURLRES_THREADED */