add initial CMake and Visual Studio build support

This moves the compatibility include files from include to
include/compat so we can use the awful MS C compiler
<../include/> trick to emulate the GNU #include_next extension.

This also removes a few old compat files we do not need anymore.

26 files changed, 1495 insertions, 0 deletions

diff --git a/include/compat/arpa/inet.h b/include/compat/arpa/inet.h
new file mode 100644
index 0000000..0cea8c4
--- /dev/null
+++ b/include/compat/arpa/inet.h
@@ -0,0 +1,19 @@
+/*
+ * Public domain
+ * arpa/inet.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <arpa/inet.h>
+#else
+#include <win32netcompat.h>
+
+#ifndef AI_ADDRCONFIG
+#define AI_ADDRCONFIG               0x00000400
+#endif
+
+#endif
+
+#ifndef HAVE_INET_PTON
+int inet_pton(int af, const char * src, void * dst);
+#endif
diff --git a/include/compat/arpa/nameser.h b/include/compat/arpa/nameser.h
new file mode 100644
index 0000000..0126a60
--- /dev/null
+++ b/include/compat/arpa/nameser.h
@@ -0,0 +1,23 @@
+/*
+ * Public domain
+ * arpa/inet.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <arpa/nameser.h>
+#else
+#include <win32netcompat.h>
+
+#ifndef INADDRSZ
+#define INADDRSZ 4
+#endif
+
+#ifndef IN6ADDRSZ
+#define IN6ADDRSZ 16
+#endif
+
+#ifndef INT16SZ
+#define INT16SZ 2
+#endif
+
+#endif
diff --git a/include/compat/dirent.h b/include/compat/dirent.h
new file mode 100644
index 0000000..753e4a0
--- /dev/null
+++ b/include/compat/dirent.h
@@ -0,0 +1,17 @@
+/*
+ * Public domain
+ * dirent.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_DIRENT_H
+#define LIBCRYPTOCOMPAT_DIRENT_H
+
+#ifdef _MSC_VER
+#include <windows.h>
+#include <dirent_msvc.h>
+#else
+#include_next <dirent.h>
+#endif
+
+#endif
+
diff --git a/include/compat/dirent_msvc.h b/include/compat/dirent_msvc.h
new file mode 100644
index 0000000..bf9cf1a
--- /dev/null
+++ b/include/compat/dirent_msvc.h
@@ -0,0 +1,748 @@
+/*
+ * dirent.h - dirent API for Microsoft Visual Studio
+ *
+ * Copyright (C) 2006-2012 Toni Ronkko
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * ``Software''), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL TONI RONKKO BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * $Id: dirent.h,v 1.20 2014/03/19 17:52:23 tronkko Exp $
+ */
+#ifndef DIRENT_MSVC_H
+#define DIRENT_MSVC_H
+
+#include <windows.h>
+
+#include <../include/stdio.h>
+#include <../include/stdarg.h>
+#include <../include/wchar.h>
+#include <../include/string.h>
+#include <../include/stdlib.h>
+#include <../include/malloc.h>
+#include <../include/sys/types.h>
+#include <sys/stat.h>
+#include <../include/errno.h>
+
+/* Indicates that d_type field is available in dirent structure */
+#define _DIRENT_HAVE_D_TYPE
+
+/* Indicates that d_namlen field is available in dirent structure */
+#define _DIRENT_HAVE_D_NAMLEN
+
+/* Entries missing from MSVC 6.0 */
+#if !defined(FILE_ATTRIBUTE_DEVICE)
+#   define FILE_ATTRIBUTE_DEVICE 0x40
+#endif
+
+/* Maximum length of file name */
+#if !defined(PATH_MAX)
+#   define PATH_MAX MAX_PATH
+#endif
+#if !defined(FILENAME_MAX)
+#   define FILENAME_MAX MAX_PATH
+#endif
+#if !defined(NAME_MAX)
+#   define NAME_MAX FILENAME_MAX
+#endif
+
+/* Return the exact length of d_namlen without zero terminator */
+#define _D_EXACT_NAMLEN(p) ((p)->d_namlen)
+
+/* Return number of bytes needed to store d_namlen */
+#define _D_ALLOC_NAMLEN(p) (PATH_MAX)
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Wide-character version */
+struct _wdirent {
+    long d_ino;                                 /* Always zero */
+    unsigned short d_reclen;                    /* Structure size */
+    size_t d_namlen;                            /* Length of name without \0 */
+    int d_type;                                 /* File type */
+    wchar_t d_name[PATH_MAX];                   /* File name */
+};
+typedef struct _wdirent _wdirent;
+
+struct _WDIR {
+    struct _wdirent ent;                        /* Current directory entry */
+    WIN32_FIND_DATAW data;                      /* Private file data */
+    int cached;                                 /* True if data is valid */
+    HANDLE handle;                              /* Win32 search handle */
+    wchar_t *patt;                              /* Initial directory name */
+};
+typedef struct _WDIR _WDIR;
+
+static _WDIR *_wopendir (const wchar_t *dirname);
+static struct _wdirent *_wreaddir (_WDIR *dirp);
+static int _wclosedir (_WDIR *dirp);
+static void _wrewinddir (_WDIR* dirp);
+
+
+/* For compatibility with Symbian */
+#define wdirent _wdirent
+#define WDIR _WDIR
+#define wopendir _wopendir
+#define wreaddir _wreaddir
+#define wclosedir _wclosedir
+#define wrewinddir _wrewinddir
+
+
+/* Multi-byte character versions */
+struct dirent {
+    long d_ino;                                 /* Always zero */
+    unsigned short d_reclen;                    /* Structure size */
+    size_t d_namlen;                            /* Length of name without \0 */
+    int d_type;                                 /* File type */
+    char d_name[PATH_MAX];                      /* File name */
+};
+typedef struct dirent dirent;
+
+struct DIR {
+    struct dirent ent;
+    struct _WDIR *wdirp;
+};
+typedef struct DIR DIR;
+
+static DIR *opendir (const char *dirname);
+static struct dirent *readdir (DIR *dirp);
+static int closedir (DIR *dirp);
+static void rewinddir (DIR* dirp);
+
+
+/* Internal utility functions */
+static WIN32_FIND_DATAW *dirent_first (_WDIR *dirp);
+static WIN32_FIND_DATAW *dirent_next (_WDIR *dirp);
+
+static int dirent_mbstowcs_s(
+    size_t *pReturnValue,
+    wchar_t *wcstr,
+    size_t sizeInWords,
+    const char *mbstr,
+    size_t count);
+
+static int dirent_wcstombs_s(
+    size_t *pReturnValue,
+    char *mbstr,
+    size_t sizeInBytes,
+    const wchar_t *wcstr,
+    size_t count);
+
+static void dirent_set_errno (int error);
+
+/*
+ * Open directory stream DIRNAME for read and return a pointer to the
+ * internal working area that is used to retrieve individual directory
+ * entries.
+ */
+static _WDIR*
+_wopendir(
+    const wchar_t *dirname)
+{
+    _WDIR *dirp = NULL;
+    int error;
+
+    /* Must have directory name */
+    if (dirname == NULL  ||  dirname[0] == '\0') {
+        dirent_set_errno (ENOENT);
+        return NULL;
+    }
+
+    /* Allocate new _WDIR structure */
+    dirp = (_WDIR*) malloc (sizeof (struct _WDIR));
+    if (dirp != NULL) {
+        DWORD n;
+
+        /* Reset _WDIR structure */
+        dirp->handle = INVALID_HANDLE_VALUE;
+        dirp->patt = NULL;
+        dirp->cached = 0;
+
+        /* Compute the length of full path plus zero terminator */
+        n = GetFullPathNameW (dirname, 0, NULL, NULL);
+
+        /* Allocate room for absolute directory name and search pattern */
+        dirp->patt = (wchar_t*) malloc (sizeof (wchar_t) * n + 16);
+        if (dirp->patt) {
+
+            /*
+             * Convert relative directory name to an absolute one.  This
+             * allows rewinddir() to function correctly even when current
+             * working directory is changed between opendir() and rewinddir().
+             */
+            n = GetFullPathNameW (dirname, n, dirp->patt, NULL);
+            if (n > 0) {
+                wchar_t *p;
+
+                /* Append search pattern \* to the directory name */
+                p = dirp->patt + n;
+                if (dirp->patt < p) {
+                    switch (p[-1]) {
+                    case '\\':
+                    case '/':
+                    case ':':
+                        /* Directory ends in path separator, e.g. c:\temp\ */
+                        /*NOP*/;
+                        break;
+
+                    default:
+                        /* Directory name doesn't end in path separator */
+                        *p++ = '\\';
+                    }
+                }
+                *p++ = '*';
+                *p = '\0';
+
+                /* Open directory stream and retrieve the first entry */
+                if (dirent_first (dirp)) {
+                    /* Directory stream opened successfully */
+                    error = 0;
+                } else {
+                    /* Cannot retrieve first entry */
+                    error = 1;
+                    dirent_set_errno (ENOENT);
+                }
+
+            } else {
+                /* Cannot retrieve full path name */
+                dirent_set_errno (ENOENT);
+                error = 1;
+            }
+
+        } else {
+            /* Cannot allocate memory for search pattern */
+            error = 1;
+        }
+
+    } else {
+        /* Cannot allocate _WDIR structure */
+        error = 1;
+    }
+
+    /* Clean up in case of error */
+    if (error  &&  dirp) {
+        _wclosedir (dirp);
+        dirp = NULL;
+    }
+
+    return dirp;
+}
+
+/*
+ * Read next directory entry.  The directory entry is returned in dirent
+ * structure in the d_name field.  Individual directory entries returned by
+ * this function include regular files, sub-directories, pseudo-directories
+ * "." and ".." as well as volume labels, hidden files and system files.
+ */
+static struct _wdirent*
+_wreaddir(
+    _WDIR *dirp)
+{
+    WIN32_FIND_DATAW *datap;
+    struct _wdirent *entp;
+
+    /* Read next directory entry */
+    datap = dirent_next (dirp);
+    if (datap) {
+        size_t n;
+        DWORD attr;
+
+        /* Pointer to directory entry to return */
+        entp = &dirp->ent;
+
+        /*
+         * Copy file name as wide-character string.  If the file name is too
+         * long to fit in to the destination buffer, then truncate file name
+         * to PATH_MAX characters and zero-terminate the buffer.
+         */
+        n = 0;
+        while (n + 1 < PATH_MAX  &&  datap->cFileName[n] != 0) {
+            entp->d_name[n] = datap->cFileName[n];
+            n++;
+        }
+        dirp->ent.d_name[n] = 0;
+
+        /* Length of file name excluding zero terminator */
+        entp->d_namlen = n;
+
+        /* File type */
+        attr = datap->dwFileAttributes;
+        if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
+            entp->d_type = DT_CHR;
+        } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+            entp->d_type = DT_DIR;
+        } else {
+            entp->d_type = DT_REG;
+        }
+
+        /* Reset dummy fields */
+        entp->d_ino = 0;
+        entp->d_reclen = sizeof (struct _wdirent);
+
+    } else {
+
+        /* Last directory entry read */
+        entp = NULL;
+
+    }
+
+    return entp;
+}
+
+/*
+ * Close directory stream opened by opendir() function.  This invalidates the
+ * DIR structure as well as any directory entry read previously by
+ * _wreaddir().
+ */
+static int
+_wclosedir(
+    _WDIR *dirp)
+{
+    int ok;
+    if (dirp) {
+
+        /* Release search handle */
+        if (dirp->handle != INVALID_HANDLE_VALUE) {
+            FindClose (dirp->handle);
+            dirp->handle = INVALID_HANDLE_VALUE;
+        }
+
+        /* Release search pattern */
+        if (dirp->patt) {
+            free (dirp->patt);
+            dirp->patt = NULL;
+        }
+
+        /* Release directory structure */
+        free (dirp);
+        ok = /*success*/0;
+
+    } else {
+        /* Invalid directory stream */
+        dirent_set_errno (EBADF);
+        ok = /*failure*/-1;
+    }
+    return ok;
+}
+
+/*
+ * Rewind directory stream such that _wreaddir() returns the very first
+ * file name again.
+ */
+static void
+_wrewinddir(
+    _WDIR* dirp)
+{
+    if (dirp) {
+        /* Release existing search handle */
+        if (dirp->handle != INVALID_HANDLE_VALUE) {
+            FindClose (dirp->handle);
+        }
+
+        /* Open new search handle */
+        dirent_first (dirp);
+    }
+}
+
+/* Get first directory entry (internal) */
+static WIN32_FIND_DATAW*
+dirent_first(
+    _WDIR *dirp)
+{
+    WIN32_FIND_DATAW *datap;
+
+    /* Open directory and retrieve the first entry */
+    dirp->handle = FindFirstFileW (dirp->patt, &dirp->data);
+    if (dirp->handle != INVALID_HANDLE_VALUE) {
+
+        /* a directory entry is now waiting in memory */
+        datap = &dirp->data;
+        dirp->cached = 1;
+
+    } else {
+
+        /* Failed to re-open directory: no directory entry in memory */
+        dirp->cached = 0;
+        datap = NULL;
+
+    }
+    return datap;
+}
+
+/* Get next directory entry (internal) */
+static WIN32_FIND_DATAW*
+dirent_next(
+    _WDIR *dirp)
+{
+    WIN32_FIND_DATAW *p;
+
+    /* Get next directory entry */
+    if (dirp->cached != 0) {
+
+        /* A valid directory entry already in memory */
+        p = &dirp->data;
+        dirp->cached = 0;
+
+    } else if (dirp->handle != INVALID_HANDLE_VALUE) {
+
+        /* Get the next directory entry from stream */
+        if (FindNextFileW (dirp->handle, &dirp->data) != FALSE) {
+            /* Got a file */
+            p = &dirp->data;
+        } else {
+            /* The very last entry has been processed or an error occured */
+            FindClose (dirp->handle);
+            dirp->handle = INVALID_HANDLE_VALUE;
+            p = NULL;
+        }
+
+    } else {
+
+        /* End of directory stream reached */
+        p = NULL;
+
+    }
+
+    return p;
+}
+
+/*
+ * Open directory stream using plain old C-string.
+ */
+static DIR*
+opendir(
+    const char *dirname)
+{
+    struct DIR *dirp;
+    int error;
+
+    /* Must have directory name */
+    if (dirname == NULL  ||  dirname[0] == '\0') {
+        dirent_set_errno (ENOENT);
+        return NULL;
+    }
+
+    /* Allocate memory for DIR structure */
+    dirp = (DIR*) malloc (sizeof (struct DIR));
+    if (dirp) {
+        wchar_t wname[PATH_MAX];
+        size_t n;
+
+        /* Convert directory name to wide-character string */
+        error = dirent_mbstowcs_s (&n, wname, PATH_MAX, dirname, PATH_MAX);
+        if (!error) {
+
+            /* Open directory stream using wide-character name */
+            dirp->wdirp = _wopendir (wname);
+            if (dirp->wdirp) {
+                /* Directory stream opened */
+                error = 0;
+            } else {
+                /* Failed to open directory stream */
+                error = 1;
+            }
+
+        } else {
+            /*
+             * Cannot convert file name to wide-character string.  This
+             * occurs if the string contains invalid multi-byte sequences or
+             * the output buffer is too small to contain the resulting
+             * string.
+             */
+            error = 1;
+        }
+
+    } else {
+        /* Cannot allocate DIR structure */
+        error = 1;
+    }
+
+    /* Clean up in case of error */
+    if (error  &&  dirp) {
+        free (dirp);
+        dirp = NULL;
+    }
+
+    return dirp;
+}
+
+/*
+ * Read next directory entry.
+ *
+ * When working with text consoles, please note that file names returned by
+ * readdir() are represented in the default ANSI code page while any output to
+ * console is typically formatted on another code page.  Thus, non-ASCII
+ * characters in file names will not usually display correctly on console.  The
+ * problem can be fixed in two ways: (1) change the character set of console
+ * to 1252 using chcp utility and use Lucida Console font, or (2) use
+ * _cprintf function when writing to console.  The _cprinf() will re-encode
+ * ANSI strings to the console code page so many non-ASCII characters will
+ * display correcly.
+ */
+static struct dirent*
+readdir(
+    DIR *dirp)
+{
+    WIN32_FIND_DATAW *datap;
+    struct dirent *entp;
+
+    /* Read next directory entry */
+    datap = dirent_next (dirp->wdirp);
+    if (datap) {
+        size_t n;
+        int error;
+
+        /* Attempt to convert file name to multi-byte string */
+        error = dirent_wcstombs_s(
+            &n, dirp->ent.d_name, PATH_MAX, datap->cFileName, PATH_MAX);
+
+        /*
+         * If the file name cannot be represented by a multi-byte string,
+         * then attempt to use old 8+3 file name.  This allows traditional
+         * Unix-code to access some file names despite of unicode
+         * characters, although file names may seem unfamiliar to the user.
+         *
+         * Be ware that the code below cannot come up with a short file
+         * name unless the file system provides one.  At least
+         * VirtualBox shared folders fail to do this.
+         */
+        if (error  &&  datap->cAlternateFileName[0] != '\0') {
+            error = dirent_wcstombs_s(
+                &n, dirp->ent.d_name, PATH_MAX,
+                datap->cAlternateFileName, PATH_MAX);
+        }
+
+        if (!error) {
+            DWORD attr;
+
+            /* Initialize directory entry for return */
+            entp = &dirp->ent;
+
+            /* Length of file name excluding zero terminator */
+            entp->d_namlen = n - 1;
+
+            /* File attributes */
+            attr = datap->dwFileAttributes;
+            if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {
+                entp->d_type = DT_CHR;
+            } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+                entp->d_type = DT_DIR;
+            } else {
+                entp->d_type = DT_REG;
+            }
+
+            /* Reset dummy fields */
+            entp->d_ino = 0;
+            entp->d_reclen = sizeof (struct dirent);
+
+        } else {
+            /*
+             * Cannot convert file name to multi-byte string so construct
+             * an errornous directory entry and return that.  Note that
+             * we cannot return NULL as that would stop the processing
+             * of directory entries completely.
+             */
+            entp = &dirp->ent;
+            entp->d_name[0] = '?';
+            entp->d_name[1] = '\0';
+            entp->d_namlen = 1;
+            entp->d_type = DT_UNKNOWN;
+            entp->d_ino = 0;
+            entp->d_reclen = 0;
+        }
+
+    } else {
+        /* No more directory entries */
+        entp = NULL;
+    }
+
+    return entp;
+}
+
+/*
+ * Close directory stream.
+ */
+static int
+closedir(
+    DIR *dirp)
+{
+    int ok;
+    if (dirp) {
+
+        /* Close wide-character directory stream */
+        ok = _wclosedir (dirp->wdirp);
+        dirp->wdirp = NULL;
+
+        /* Release multi-byte character version */
+        free (dirp);
+
+    } else {
+
+        /* Invalid directory stream */
+        dirent_set_errno (EBADF);
+        ok = /*failure*/-1;
+
+    }
+    return ok;
+}
+
+/*
+ * Rewind directory stream to beginning.
+ */
+static void
+rewinddir(
+    DIR* dirp)
+{
+    /* Rewind wide-character string directory stream */
+    _wrewinddir (dirp->wdirp);
+}
+
+/* Convert multi-byte string to wide character string */
+static int
+dirent_mbstowcs_s(
+    size_t *pReturnValue,
+    wchar_t *wcstr,
+    size_t sizeInWords,
+    const char *mbstr,
+    size_t count)
+{
+    int error;
+
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 or later */
+    error = mbstowcs_s (pReturnValue, wcstr, sizeInWords, mbstr, count);
+
+#else
+
+    /* Older Visual Studio or non-Microsoft compiler */
+    size_t n;
+
+    /* Convert to wide-character string (or count characters) */
+    n = mbstowcs (wcstr, mbstr, sizeInWords);
+    if (!wcstr  ||  n < count) {
+
+        /* Zero-terminate output buffer */
+        if (wcstr  &&  sizeInWords) {
+            if (n >= sizeInWords) {
+                n = sizeInWords - 1;
+            }
+            wcstr[n] = 0;
+        }
+
+        /* Length of resuting multi-byte string WITH zero terminator */
+        if (pReturnValue) {
+            *pReturnValue = n + 1;
+        }
+
+        /* Success */
+        error = 0;
+
+    } else {
+
+        /* Could not convert string */
+        error = 1;
+
+    }
+
+#endif
+
+    return error;
+}
+
+/* Convert wide-character string to multi-byte string */
+static int
+dirent_wcstombs_s(
+    size_t *pReturnValue,
+    char *mbstr,
+    size_t sizeInBytes, /* max size of mbstr */
+    const wchar_t *wcstr,
+    size_t count)
+{
+    int error;
+
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 or later */
+    error = wcstombs_s (pReturnValue, mbstr, sizeInBytes, wcstr, count);
+
+#else
+
+    /* Older Visual Studio or non-Microsoft compiler */
+    size_t n;
+
+    /* Convert to multi-byte string (or count the number of bytes needed) */
+    n = wcstombs (mbstr, wcstr, sizeInBytes);
+    if (!mbstr  ||  n < count) {
+
+        /* Zero-terminate output buffer */
+        if (mbstr  &&  sizeInBytes) {
+            if (n >= sizeInBytes) {
+                n = sizeInBytes - 1;
+            }
+            mbstr[n] = '\0';
+        }
+
+        /* Lenght of resulting multi-bytes string WITH zero-terminator */
+        if (pReturnValue) {
+            *pReturnValue = n + 1;
+        }
+
+        /* Success */
+        error = 0;
+
+    } else {
+
+        /* Cannot convert string */
+        error = 1;
+
+    }
+
+#endif
+
+    return error;
+}
+
+/* Set errno variable */
+static void
+dirent_set_errno(
+    int error)
+{
+#if defined(_MSC_VER)  &&  _MSC_VER >= 1400
+
+    /* Microsoft Visual Studio 2005 and later */
+    _set_errno (error);
+
+#else
+
+    /* Non-Microsoft compiler or older Microsoft compiler */
+    errno = error;
+
+#endif
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /*DIRENT_H*/
+
diff --git a/include/compat/err.h b/include/compat/err.h
new file mode 100644
index 0000000..af68a26
--- /dev/null
+++ b/include/compat/err.h
@@ -0,0 +1,33 @@
+/*
+ * Public domain
+ * err.h compatibility shim
+ */
+
+#ifdef HAVE_ERR_H
+
+#include_next <err.h>
+
+#else
+
+#ifndef LIBCRYPTOCOMPAT_ERR_H
+#define LIBCRYPTOCOMPAT_ERR_H
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#define err(exitcode, format, ...) \
+  errx(exitcode, format ": %s", __VA_ARGS__, strerror(errno))
+
+#define errx(exitcode, format, ...) \
+  do { warnx(format, __VA_ARGS__); exit(exitcode); } while (0)
+
+#define warn(format, ...) \
+  warnx(format ": %s", __VA_ARGS__, strerror(errno))
+
+#define warnx(format, ...) \
+  fprintf(stderr, format "\n", __VA_ARGS__)
+
+#endif
+
+#endif
diff --git a/include/compat/machine/endian.h b/include/compat/machine/endian.h
new file mode 100644
index 0000000..5ec39af
--- /dev/null
+++ b/include/compat/machine/endian.h
@@ -0,0 +1,40 @@
+/*
+ * Public domain
+ * machine/endian.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_BYTE_ORDER_H_
+#define LIBCRYPTOCOMPAT_BYTE_ORDER_H_
+
+#if defined(_WIN32)
+
+#define LITTLE_ENDIAN  1234
+#define BIG_ENDIAN 4321
+#define PDP_ENDIAN      3412
+
+/*
+ * Use GCC and Visual Studio compiler defines to determine endian.
+ */
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define BYTE_ORDER LITTLE_ENDIAN
+#else
+#define BYTE_ORDER BIG_ENDIAN
+#endif
+
+#elif defined(__linux__)
+#include <endian.h>
+
+#elif defined(__sun) || defined(_AIX) || defined(__hpux)
+#include <sys/types.h>
+#include <arpa/nameser_compat.h>
+
+#elif defined(__sgi)
+#include <standards.h>
+#include <sys/endian.h>
+
+#else
+#include_next <machine/endian.h>
+
+#endif
+
+#endif
diff --git a/include/compat/netdb.h b/include/compat/netdb.h
new file mode 100644
index 0000000..d36b91d
--- /dev/null
+++ b/include/compat/netdb.h
@@ -0,0 +1,10 @@
+/*
+ * Public domain
+ * netdb.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <netdb.h>
+#else
+#include <win32netcompat.h>
+#endif
diff --git a/include/compat/netinet/in.h b/include/compat/netinet/in.h
new file mode 100644
index 0000000..20e57b8
--- /dev/null
+++ b/include/compat/netinet/in.h
@@ -0,0 +1,10 @@
+/*
+ * Public domain
+ * netinet/in.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <netinet/in.h>
+#else
+#include <win32netcompat.h>
+#endif
diff --git a/include/compat/netinet/tcp.h b/include/compat/netinet/tcp.h
new file mode 100644
index 0000000..c98cf74
--- /dev/null
+++ b/include/compat/netinet/tcp.h
@@ -0,0 +1,10 @@
+/*
+ * Public domain
+ * netinet/tcp.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <netinet/tcp.h>
+#else
+#include <win32netcompat.h>
+#endif
diff --git a/include/compat/poll.h b/include/compat/poll.h
new file mode 100644
index 0000000..e9204cf
--- /dev/null
+++ b/include/compat/poll.h
@@ -0,0 +1,63 @@
+/*
+ * Public domain
+ *
+ * poll(2) emulation for Windows
+ *
+ * This emulates just-enough poll functionality on Windows to work in the
+ * context of the openssl(1) program. This is not a replacement for
+ * POSIX.1-2001 poll(2).
+ *
+ * Dongsheng Song <dongsheng.song@gmail.com>
+ * Brent Cook <bcook@openbsd.org>
+ */
+
+#ifndef LIBCRYPTOCOMPAT_POLL_H
+#define LIBCRYPTOCOMPAT_POLL_H
+
+#ifndef _WIN32
+#include_next <poll.h>
+#else
+
+#include <winsock2.h>
+
+/* Type used for the number of file descriptors. */
+typedef unsigned long int nfds_t;
+
+#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0600)
+/* Data structure describing a polling request. */
+struct pollfd {
+        int fd; /* file descriptor */
+        short events; /* requested events */
+        short revents; /* returned events */
+};
+
+/* Event types that can be polled */
+#define POLLIN 0x001 /* There is data to read. */
+#define POLLPRI 0x002 /* There is urgent data to read. */
+#define POLLOUT 0x004 /* Writing now will not block. */
+
+# define POLLRDNORM 0x040 /* Normal data may be read. */
+# define POLLRDBAND 0x080 /* Priority data may be read. */
+# define POLLWRNORM 0x100 /* Writing now will not block. */
+# define POLLWRBAND 0x200 /* Priority data may be written. */
+
+/* Event types always implicitly polled. */
+#define POLLERR 0x008 /* Error condition. */
+#define POLLHUP 0x010 /* Hung up. */
+#define POLLNVAL 0x020 /* Invalid polling request. */
+
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int poll(struct pollfd *pfds, nfds_t nfds, int timeout);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAVE_POLL */
+
+#endif /* LIBCRYPTOCOMPAT_POLL_H */
diff --git a/include/compat/stdio.h b/include/compat/stdio.h
new file mode 100644
index 0000000..973faa4
--- /dev/null
+++ b/include/compat/stdio.h
@@ -0,0 +1,39 @@
+/*
+ * Public domain
+ * stdio.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_STDIO_H
+#define LIBCRYPTOCOMPAT_STDIO_H
+
+#ifdef _MSC_VER
+#include <../include/stdio.h>
+#else
+#include_next <stdio.h>
+#endif
+
+#ifndef HAVE_ASPRINTF
+#include <stdarg.h>
+int vasprintf(char **str, const char *fmt, va_list ap);
+int asprintf(char **str, const char *fmt, ...);
+#endif
+
+#ifdef _WIN32
+
+void posix_perror(const char *s);
+FILE * posix_fopen(const char *path, const char *mode);
+int posix_rename(const char *oldpath, const char *newpath);
+
+#ifndef NO_REDEF_POSIX_FUNCTIONS
+#define perror(errnum) posix_perror(errnum)
+#define fopen(path, mode) posix_fopen(path, mode)
+#define rename(oldpath, newpath) posix_rename(oldpath, newpath)
+#endif
+
+#ifdef _MSC_VER
+#define snprintf _snprintf
+#endif
+
+#endif
+
+#endif
diff --git a/include/compat/stdlib.h b/include/compat/stdlib.h
new file mode 100644
index 0000000..47189fd
--- /dev/null
+++ b/include/compat/stdlib.h
@@ -0,0 +1,34 @@
+/*
+ * stdlib.h compatibility shim
+ * Public domain
+ */
+
+#ifndef LIBCRYPTOCOMPAT_STDLIB_H
+#define LIBCRYPTOCOMPAT_STDLIB_H
+
+#ifdef _MSC_VER
+#include <../include/stdlib.h>
+#else
+#include_next <stdlib.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+//#include <sys/time.h>
+#include <stdint.h>
+
+#ifndef HAVE_ARC4RANDOM_BUF
+uint32_t arc4random(void);
+void arc4random_buf(void *_buf, size_t n);
+#endif
+
+#ifndef HAVE_REALLOCARRAY
+void *reallocarray(void *, size_t, size_t);
+#endif
+
+#ifndef HAVE_STRTONUM
+long long strtonum(const char *nptr, long long minval,
+                long long maxval, const char **errstr);
+#endif
+
+#endif
diff --git a/include/compat/string.h b/include/compat/string.h
new file mode 100644
index 0000000..eabc4c4
--- /dev/null
+++ b/include/compat/string.h
@@ -0,0 +1,82 @@
+/*
+ * Public domain
+ * string.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_STRING_H
+#define LIBCRYPTOCOMPAT_STRING_H
+
+#ifdef _MSC_VER
+#include <../include/string.h>
+#else
+#include_next <string.h>
+#endif
+
+#include <sys/types.h>
+
+#if defined(__sun) || defined(__hpux)
+/* Some functions historically defined in string.h were placed in strings.h by
+ * SUS. Use the same hack as OS X and FreeBSD use to work around on Solaris and HPUX.
+ */
+#include <strings.h>
+#endif
+
+#ifndef HAVE_STRCASECMP
+int strcasecmp(const char *s1, const char *s2);
+int strncasecmp(const char *s1, const char *s2, size_t len);
+#endif
+
+#ifndef HAVE_STRLCPY
+size_t strlcpy(char *dst, const char *src, size_t siz);
+#endif
+
+#ifndef HAVE_STRLCAT
+size_t strlcat(char *dst, const char *src, size_t siz);
+#endif
+
+#ifndef HAVE_STRNDUP
+char * strndup(const char *str, size_t maxlen);
+/* the only user of strnlen is strndup, so only build it if needed */
+#ifndef HAVE_STRNLEN
+size_t strnlen(const char *str, size_t maxlen);
+#endif
+#endif
+
+#ifndef HAVE_STRSEP
+char *strsep(char **stringp, const char *delim);
+#endif
+
+#ifndef HAVE_EXPLICIT_BZERO
+void explicit_bzero(void *, size_t);
+#endif
+
+#ifndef HAVE_TIMINGSAFE_BCMP
+int timingsafe_bcmp(const void *b1, const void *b2, size_t n);
+#endif
+
+#ifndef HAVE_TIMINGSAFE_MEMCMP
+int timingsafe_memcmp(const void *b1, const void *b2, size_t len);
+#endif
+
+#ifndef HAVE_MEMMEM
+void * memmem(const void *big, size_t big_len, const void *little,
+        size_t little_len);
+#endif
+
+#ifdef _WIN32
+#include <errno.h>
+
+static inline char  *
+posix_strerror(int errnum)
+{
+        if (errnum == ECONNREFUSED) {
+                return "Connection refused";
+        }
+        return strerror(errnum);
+}
+
+#define strerror(errnum) posix_strerror(errnum)
+
+#endif
+
+#endif
diff --git a/include/compat/sys/cdefs.h b/include/compat/sys/cdefs.h
new file mode 100644
index 0000000..21ef031
--- /dev/null
+++ b/include/compat/sys/cdefs.h
@@ -0,0 +1,31 @@
+/*
+ * Public domain
+ * sys/cdefs.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_SYS_CDEFS_H
+#define LIBCRYPTOCOMPAT_SYS_CDEFS_H
+
+#ifdef _WIN32
+
+#define __warn_references(sym,msg)
+
+#else
+
+#include_next <sys/cdefs.h>
+
+#ifndef __warn_references
+
+#if defined(__GNUC__)  && defined (HAS_GNU_WARNING_LONG)
+#define __warn_references(sym,msg)          \
+  __asm__(".section .gnu.warning." __STRING(sym)  \
+         " ; .ascii \"" msg "\" ; .text");
+#else
+#define __warn_references(sym,msg)
+#endif
+
+#endif /* __warn_references */
+
+#endif /* _WIN32 */
+
+#endif /* LIBCRYPTOCOMPAT_SYS_CDEFS_H */
diff --git a/include/compat/sys/ioctl.h b/include/compat/sys/ioctl.h
new file mode 100644
index 0000000..a255506
--- /dev/null
+++ b/include/compat/sys/ioctl.h
@@ -0,0 +1,11 @@
+/*
+ * Public domain
+ * sys/ioctl.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <sys/ioctl.h>
+#else
+#include <win32netcompat.h>
+#define ioctl(fd, type, arg) ioctlsocket(fd, type, arg)
+#endif
diff --git a/include/compat/sys/mman.h b/include/compat/sys/mman.h
new file mode 100644
index 0000000..d9eb6a9
--- /dev/null
+++ b/include/compat/sys/mman.h
@@ -0,0 +1,19 @@
+/*
+ * Public domain
+ * sys/mman.h compatibility shim
+ */
+
+#include_next <sys/mman.h>
+
+#ifndef LIBCRYPTOCOMPAT_MMAN_H
+#define LIBCRYPTOCOMPAT_MMAN_H
+
+#ifndef MAP_ANON
+#ifdef MAP_ANONYMOUS
+#define MAP_ANON MAP_ANONYMOUS
+#else
+#error "System does not support mapping anonymous pages?"
+#endif
+#endif
+
+#endif
diff --git a/include/compat/sys/param.h b/include/compat/sys/param.h
new file mode 100644
index 0000000..70488f8
--- /dev/null
+++ b/include/compat/sys/param.h
@@ -0,0 +1,15 @@
+/*
+ * Public domain
+ * sys/param.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_SYS_PARAM_H
+#define LIBCRYPTOCOMPAT_SYS_PARAM_H
+
+#ifdef _MSC_VER
+#include <winsock2.h>
+#else
+#include_next <sys/param.h>
+#endif
+
+#endif
diff --git a/include/compat/sys/select.h b/include/compat/sys/select.h
new file mode 100644
index 0000000..5ca0ea1
--- /dev/null
+++ b/include/compat/sys/select.h
@@ -0,0 +1,10 @@
+/*
+ * Public domain
+ * sys/select.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <sys/select.h>
+#else
+#include <win32netcompat.h>
+#endif
diff --git a/include/compat/sys/socket.h b/include/compat/sys/socket.h
new file mode 100644
index 0000000..17e84f1
--- /dev/null
+++ b/include/compat/sys/socket.h
@@ -0,0 +1,10 @@
+/*
+ * Public domain
+ * sys/socket.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <sys/socket.h>
+#else
+#include <win32netcompat.h>
+#endif
diff --git a/include/compat/sys/stat.h b/include/compat/sys/stat.h
new file mode 100644
index 0000000..55135d8
--- /dev/null
+++ b/include/compat/sys/stat.h
@@ -0,0 +1,95 @@
+/*
+ * Public domain
+ * sys/stat.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_SYS_STAT_H
+#define LIBCRYPTOCOMPAT_SYS_STAT_H
+
+#ifdef _MSC_VER
+#include <windows.h>
+#include <../include/sys/stat.h>
+
+/* File type and permission flags for stat() */
+#if !defined(S_IFMT)
+#   define S_IFMT   _S_IFMT                     /* File type mask */
+#endif
+#if !defined(S_IFDIR)
+#   define S_IFDIR  _S_IFDIR                    /* Directory */
+#endif
+#if !defined(S_IFCHR)
+#   define S_IFCHR  _S_IFCHR                    /* Character device */
+#endif
+#if !defined(S_IFFIFO)
+#   define S_IFFIFO _S_IFFIFO                   /* Pipe */
+#endif
+#if !defined(S_IFREG)
+#   define S_IFREG  _S_IFREG                    /* Regular file */
+#endif
+#if !defined(S_IREAD)
+#   define S_IREAD  _S_IREAD                    /* Read permission */
+#endif
+#if !defined(S_IWRITE)
+#   define S_IWRITE _S_IWRITE                   /* Write permission */
+#endif
+#if !defined(S_IEXEC)
+#   define S_IEXEC  _S_IEXEC                    /* Execute permission */
+#endif
+#if !defined(S_IFIFO)
+#   define S_IFIFO _S_IFIFO                     /* Pipe */
+#endif
+#if !defined(S_IFBLK)
+#   define S_IFBLK   0                          /* Block device */
+#endif
+#if !defined(S_IFLNK)
+#   define S_IFLNK   0                          /* Link */
+#endif
+#if !defined(S_IFSOCK)
+#   define S_IFSOCK  0                          /* Socket */
+#endif
+
+#if defined(_MSC_VER)
+#   define S_IRUSR  S_IREAD                     /* Read user */
+#   define S_IWUSR  S_IWRITE                    /* Write user */
+#   define S_IXUSR  0                           /* Execute user */
+#   define S_IRGRP  0                           /* Read group */
+#   define S_IWGRP  0                           /* Write group */
+#   define S_IXGRP  0                           /* Execute group */
+#   define S_IROTH  0                           /* Read others */
+#   define S_IWOTH  0                           /* Write others */
+#   define S_IXOTH  0                           /* Execute others */
+#endif
+
+/* File type flags for d_type */
+#define DT_UNKNOWN  0
+#define DT_REG      S_IFREG
+#define DT_DIR      S_IFDIR
+#define DT_FIFO     S_IFIFO
+#define DT_SOCK     S_IFSOCK
+#define DT_CHR      S_IFCHR
+#define DT_BLK      S_IFBLK
+#define DT_LNK      S_IFLNK
+
+/* Macros for converting between st_mode and d_type */
+#define IFTODT(mode) ((mode) & S_IFMT)
+#define DTTOIF(type) (type)
+
+/*
+ * File type macros.  Note that block devices, sockets and links cannot be
+ * distinguished on Windows and the macros S_ISBLK, S_ISSOCK and S_ISLNK are
+ * only defined for compatibility.  These macros should always return false
+ * on Windows.
+ */
+#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
+#define S_ISDIR(mode)  (((mode) & S_IFMT) == S_IFDIR)
+#define S_ISREG(mode)  (((mode) & S_IFMT) == S_IFREG)
+#define S_ISLNK(mode)  (((mode) & S_IFMT) == S_IFLNK)
+#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
+#define S_ISCHR(mode)  (((mode) & S_IFMT) == S_IFCHR)
+#define S_ISBLK(mode)  (((mode) & S_IFMT) == S_IFBLK)
+
+#else
+#include_next <sys/stat.h>
+#endif
+
+#endif
diff --git a/include/compat/sys/time.h b/include/compat/sys/time.h
new file mode 100644
index 0000000..235bc6e
--- /dev/null
+++ b/include/compat/sys/time.h
@@ -0,0 +1,16 @@
+/*
+ * Public domain
+ * sys/time.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_SYS_TIME_H
+#define LIBCRYPTOCOMPAT_SYS_TIME_H
+
+#ifdef _MSC_VER
+#include <winsock2.h>
+int gettimeofday(struct timeval *tp, void *tzp);
+#else
+#include_next <sys/time.h>
+#endif
+
+#endif
diff --git a/include/compat/sys/types.h b/include/compat/sys/types.h
new file mode 100644
index 0000000..9929dd5
--- /dev/null
+++ b/include/compat/sys/types.h
@@ -0,0 +1,43 @@
+/*
+ * Public domain
+ * sys/types.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_SYS_TYPES_H
+#define LIBCRYPTOCOMPAT_SYS_TYPES_H
+
+#ifdef _MSC_VER
+#include <../include/sys/types.h>
+#else
+#include_next <sys/types.h>
+#endif
+
+#include <stdint.h>
+
+#ifdef __MINGW32__
+#include <_bsd_types.h>
+#endif
+
+#ifdef _MSC_VER
+typedef unsigned char   u_char;
+typedef unsigned short  u_short;
+typedef unsigned int    u_int;
+
+#include <basetsd.h>
+typedef SSIZE_T ssize_t;
+
+#ifndef SSIZE_MAX
+#ifdef _WIN64
+#define SSIZE_MAX _I64_MAX
+#else
+#define SSIZE_MAX INT_MAX
+#endif
+#endif
+
+#endif
+
+#if !defined(HAVE_ATTRIBUTE__BOUNDED__) && !defined(__bounded__)
+# define __bounded__(x, y, z)
+#endif
+
+#endif
diff --git a/include/compat/sys/uio.h b/include/compat/sys/uio.h
new file mode 100644
index 0000000..b4aee9e
--- /dev/null
+++ b/include/compat/sys/uio.h
@@ -0,0 +1,17 @@
+/*
+ * Public domain
+ * sys/select.h compatibility shim
+ */
+
+#ifndef _WIN32
+#include_next <sys/uio.h>
+#else
+
+#include <sys/types.h>
+
+struct iovec {
+        void *iov_base;
+        size_t iov_len;
+};
+
+#endif
diff --git a/include/compat/time.h b/include/compat/time.h
new file mode 100644
index 0000000..d363d42
--- /dev/null
+++ b/include/compat/time.h
@@ -0,0 +1,16 @@
+/*
+ * Public domain
+ * sys/time.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_TIME_H
+#define LIBCRYPTOCOMPAT_TIME_H
+
+#ifdef _MSC_VER
+#include <../include/time.h>
+#define gmtime_r(tp, tm) ((gmtime_s((tm), (tp)) == 0) ? (tm) : NULL)
+#else
+#include_next <time.h>
+#endif
+
+#endif
diff --git a/include/compat/unistd.h b/include/compat/unistd.h
new file mode 100644
index 0000000..4676dc8
--- /dev/null
+++ b/include/compat/unistd.h
@@ -0,0 +1,36 @@
+/*
+ * Public domain
+ * unistd.h compatibility shim
+ */
+
+#ifndef LIBCRYPTOCOMPAT_UNISTD_H
+#define LIBCRYPTOCOMPAT_UNISTD_H
+
+#ifndef _MSC_VER
+#include_next <unistd.h>
+#else
+
+#include <stdlib.h>
+#include <io.h>
+#include <process.h>
+
+#define R_OK    4
+#define W_OK    2
+#define X_OK    0
+#define F_OK    0
+
+#define access _access
+
+static inline unsigned int sleep(unsigned int seconds)
+{
+        Sleep(seconds * 1000);
+        return seconds;
+}
+
+#endif
+
+#ifndef HAVE_GETENTROPY
+int getentropy(void *buf, size_t buflen);
+#endif
+
+#endif
diff --git a/include/compat/win32netcompat.h b/include/compat/win32netcompat.h
new file mode 100644
index 0000000..452cfba
--- /dev/null
+++ b/include/compat/win32netcompat.h
@@ -0,0 +1,48 @@
+/*
+ * Public domain
+ *
+ * BSD socket emulation code for Winsock2
+ * Brent Cook <bcook@openbsd.org>
+ */
+
+#ifndef LIBCRYPTOCOMPAT_WIN32NETCOMPAT_H
+#define LIBCRYPTOCOMPAT_WIN32NETCOMPAT_H
+
+#ifdef _WIN32
+
+#include <ws2tcpip.h>
+
+#define SHUT_RDWR SD_BOTH
+#define SHUT_RD   SD_RECEIVE
+#define SHUT_WR   SD_SEND
+
+#include <errno.h>
+#include <unistd.h>
+
+int posix_connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);
+
+int posix_close(int fd);
+ssize_t posix_read(int fd, void *buf, size_t count);
+
+ssize_t posix_write(int fd, const void *buf, size_t count);
+
+int posix_getsockopt(int sockfd, int level, int optname,
+        void *optval, socklen_t *optlen);
+
+int posix_setsockopt(int sockfd, int level, int optname,
+        const void *optval, socklen_t optlen);
+
+#ifndef NO_REDEF_POSIX_FUNCTIONS
+#define connect(sockfd, addr, addrlen) posix_connect(sockfd, addr, addrlen)
+#define close(fd) posix_close(fd)
+#define read(fd, buf, count) posix_read(fd, buf, count)
+#define write(fd, buf, count) posix_write(fd, buf, count)
+#define getsockopt(sockfd, level, optname, optval, optlen) \
+        posix_getsockopt(sockfd, level, optname, optval, optlen)
+#define setsockopt(sockfd, level, optname, optval, optlen) \
+        posix_setsockopt(sockfd, level, optname, optval, optlen)
+#endif
+
+#endif
+
+#endif