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, 88 insertions, 0 deletions

diff --git a/lib/smtp.h b/lib/smtp.h
new file mode 100644
index 000000000..0d605628d
--- /dev/null
+++ b/lib/smtp.h
@@ -0,0 +1,88 @@
+#ifndef HEADER_CURL_SMTP_H
+#define HEADER_CURL_SMTP_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2009 - 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 "pingpong.h"
+
+/****************************************************************************
+ * SMTP unique setup
+ ***************************************************************************/
+typedef enum {
+  SMTP_STOP,        /* do nothing state, stops the state machine */
+  SMTP_SERVERGREET, /* waiting for the initial greeting immediately after
+                       a connect */
+  SMTP_EHLO,
+  SMTP_HELO,
+  SMTP_STARTTLS,
+  SMTP_UPGRADETLS,  /* asynchronously upgrade the connection to SSL/TLS
+                       (multi mode only) */
+  SMTP_AUTH_PLAIN,
+  SMTP_AUTH_LOGIN,
+  SMTP_AUTH_PASSWD,
+  SMTP_AUTH_CRAMMD5,
+  SMTP_AUTH_DIGESTMD5,
+  SMTP_AUTH_DIGESTMD5_RESP,
+  SMTP_AUTH_NTLM,
+  SMTP_AUTH_NTLM_TYPE2MSG,
+  SMTP_AUTH,
+  SMTP_MAIL,        /* MAIL FROM */
+  SMTP_RCPT,        /* RCPT TO */
+  SMTP_DATA,
+  SMTP_POSTDATA,
+  SMTP_QUIT,
+  SMTP_LAST         /* never used */
+} smtpstate;
+
+/* smtp_conn is used for struct connection-oriented data in the connectdata
+   struct */
+struct smtp_conn {
+  struct pingpong pp;
+  char *domain;            /* Client address/name to send in the EHLO */
+  size_t eob;              /* Number of bytes of the EOB (End Of Body) that
+                              have been received so far */
+  unsigned int authmechs;  /* Accepted authentication mechanisms */
+  unsigned int authused;   /* Auth mechanism used for the connection */
+  smtpstate state;         /* Always use smtp.c:state() to change state! */
+  struct curl_slist *rcpt; /* Recipient list */
+  bool ssldone;            /* Is connect() over SSL done? Only relevant in
+                              multi mode */
+  bool size_supported;     /* If server supports SIZE extension according to
+                              RFC 1870 */
+};
+
+extern const struct Curl_handler Curl_handler_smtp;
+extern const struct Curl_handler Curl_handler_smtps;
+
+/* this is the 5-bytes End-Of-Body marker for SMTP */
+#define SMTP_EOB "\x0d\x0a\x2e\x0d\x0a"
+#define SMTP_EOB_LEN 5
+#define SMTP_EOB_FIND_LEN 3
+
+/* if found in data, replace it with this string instead */
+#define SMTP_EOB_REPL "\x0d\x0a\x2e\x2e"
+#define SMTP_EOB_REPL_LEN 4
+
+CURLcode Curl_smtp_escape_eob(struct connectdata *conn, ssize_t nread);
+
+#endif /* HEADER_CURL_SMTP_H */
+