Improve support for DOS-like systems.

Here DOS-like means DOS, Windows, and OS/2.

src/common/physmem.h

@@ -34,6 +34,10 @@
 #	include <windows.h>
 #endif
 
+#ifdef __DJGPP__
+#	include <dpmi.h>
+#endif
+
 
 /// \brief      Get the amount of physical memory in bytes
 ///
@@ -76,6 +80,14 @@ physmem(void)
 	meminfo.dwLength = sizeof(meminfo);
 	if (GlobalMemoryStatusEx(&meminfo))
 		ret = meminfo.ullTotalPhys;
+
+#elif defined(__DJGPP__)
+	__dpmi_free_mem_info meminfo;
+	if (__dpmi_get_free_memory_information(&meminfo) == 0
+			&& meminfo.total_number_of_physical_pages
+				!= (unsigned long)(-1))
+		ret = (uint64_t)(meminfo.total_number_of_physical_pages)
+				* 4096;
 #endif
 
 	return ret;

src/common/sysdefs.h

@@ -154,6 +154,10 @@ typedef unsigned char _Bool;
 // Macros //
 ////////////
 
+#if defined(_WIN32) || defined(__MSDOS__) || defined(__OS2__)
+#	define DOSLIKE 1
+#endif
+
 #undef memzero
 #define memzero(s, n) memset(s, 0, n)
 

src/liblzma/check/crc32_x86.S

@@ -60,7 +60,7 @@ init_table(void)
  * Solaris assembler doesn't have .p2align, and Darwin uses .align
  * differently than GNU/Linux and Solaris.
  */
-#ifdef __MACH__
+#if defined(__MACH__) || defined(__MSDOS__)
 #	define ALIGN(pow2, abs) .align pow2
 #else
 #	define ALIGN(pow2, abs) .align abs
@@ -69,7 +69,7 @@ init_table(void)
 	.text
 	.globl	LZMA_CRC32
 
-#if !defined(__MACH__) && !defined(_WIN32)
+#if !defined(__MACH__) && !defined(_WIN32) && !defined(__MSDOS__)
 	.type	LZMA_CRC32, @function
 #endif
 
@@ -275,7 +275,7 @@ LZMA_CRC32:
 	.ascii " -export:lzma_crc32"
 #	endif
 
-#else
+#elif !defined(__MSDOS__)
 	/* ELF */
 	.size	LZMA_CRC32, .-LZMA_CRC32
 #endif

src/liblzma/check/crc64_x86.S

@@ -53,7 +53,7 @@ init_table(void)
  * Solaris assembler doesn't have .p2align, and Darwin uses .align
  * differently than GNU/Linux and Solaris.
  */
-#ifdef __MACH__
+#if defined(__MACH__) || defined(__MSDOS__)
 #	define ALIGN(pow2, abs) .align pow2
 #else
 #	define ALIGN(pow2, abs) .align abs
@@ -62,7 +62,7 @@ init_table(void)
 	.text
 	.globl	LZMA_CRC64
 
-#if !defined(__MACH__) && !defined(_WIN32)
+#if !defined(__MACH__) && !defined(_WIN32) && !defined(__MSDOS__)
 	.type	LZMA_CRC64, @function
 #endif
 
@@ -261,7 +261,7 @@ LZMA_CRC64:
 	.ascii " -export:lzma_crc64"
 #	endif
 
-#else
+#elif !defined(__MSDOS__)
 	/* ELF */
 	.size	LZMA_CRC64, .-LZMA_CRC64
 #endif

src/xz/args.c

@@ -424,15 +424,12 @@ args_parse(args_info *args, int argc, char **argv)
 
 	// Check how we were called.
 	{
-		// Remove the leading path name, if any.
-#ifdef _WIN32
-		// Some systems support both / and \ to separate path
-		// components.
-		const char *name = argv[0] + strlen(argv[0]);
-		while (argv[0] < name && name[-1] != '/' && name[-1] != '\\')
-			--name;
+#ifdef DOSLIKE
+		// We adjusted argv[0] in the beginning of main() so we don't
+		// need to do anything here.
+		const char *name = argv[0];
 #else
-		// POSIX
+		// Remove the leading path name, if any.
 		const char *name = strrchr(argv[0], '/');
 		if (name == NULL)
 			name = argv[0];

src/xz/io.c

@@ -21,6 +21,10 @@
 
 #include <fcntl.h>
 
+#ifdef DOSLIKE
+#	include <io.h>
+#endif
+
 #if defined(HAVE_FUTIMES) || defined(HAVE_FUTIMESAT) || defined(HAVE_UTIMES)
 #	include <sys/time.h>
 #elif defined(HAVE_UTIME)
@@ -35,7 +39,7 @@
 #	define O_NOCTTY 0
 #endif
 
-#ifndef _WIN32
+#ifndef DOSLIKE
 #	include "open_stdxxx.h"
 static bool warn_fchown;
 #endif
@@ -44,7 +48,7 @@ static bool warn_fchown;
 extern void
 io_init(void)
 {
-#ifndef _WIN32
+#ifndef DOSLIKE
 	// Make sure that stdin, stdout, and and stderr are connected to
 	// a valid file descriptor. Exit immediatelly with exit code ERROR
 	// if we cannot make the file descriptors valid. Maybe we should
@@ -56,6 +60,13 @@ io_init(void)
 	warn_fchown = geteuid() == 0;
 #endif
 
+#ifdef __DJGPP__
+	// Avoid doing useless things when statting files.
+	// This isn't important but doesn't hurt.
+	_djstat_flags = _STAT_INODE | _STAT_EXEC_EXT
+			| _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
+#endif
+
 	return;
 }
 
@@ -70,7 +81,7 @@ static void
 io_unlink(const char *name, const struct stat *known_st)
 {
 	// On Windows, st_ino is meaningless, so don't bother testing it.
-#ifndef _WIN32
+#ifndef DOSLIKE
 	struct stat new_st;
 
 	if (lstat(name, &new_st)
@@ -98,7 +109,7 @@ static void
 io_copy_attrs(const file_pair *pair)
 {
 	// Skip chown and chmod on Windows.
-#ifndef _WIN32
+#ifndef DOSLIKE
 	// This function is more tricky than you may think at first.
 	// Blindly copying permissions may permit users to access the
 	// destination file who didn't have permission to access the
@@ -233,7 +244,7 @@ io_open_src(file_pair *pair)
 	// There's nothing to open when reading from stdin.
 	if (pair->src_name == stdin_filename) {
 		pair->src_fd = STDIN_FILENO;
-#ifdef _WIN32
+#ifdef DOSLIKE
 		setmode(STDIN_FILENO, O_BINARY);
 #endif
 		return false;
@@ -246,7 +257,7 @@ io_open_src(file_pair *pair)
 	// Flags for open()
 	int flags = O_RDONLY | O_BINARY | O_NOCTTY;
 
-#ifndef _WIN32
+#ifndef DOSLIKE
 	// If we accept only regular files, we need to be careful to avoid
 	// problems with special files like devices and FIFOs. O_NONBLOCK
 	// prevents blocking when opening such files. When we want to accept
@@ -259,7 +270,7 @@ io_open_src(file_pair *pair)
 #if defined(O_NOFOLLOW)
 	if (reg_files_only)
 		flags |= O_NOFOLLOW;
-#elif !defined(_WIN32)
+#elif !defined(DOSLIKE)
 	// Some POSIX-like systems lack O_NOFOLLOW (it's not required
 	// by POSIX). Check for symlinks with a separate lstat() on
 	// these systems.
@@ -363,7 +374,7 @@ io_open_src(file_pair *pair)
 		return true;
 	}
 
-#ifndef _WIN32
+#ifndef DOSLIKE
 	// Drop O_NONBLOCK, which is used only when we are accepting only
 	// regular files. After the open() call, we want things to block
 	// instead of giving EAGAIN.
@@ -398,7 +409,7 @@ io_open_src(file_pair *pair)
 		}
 
 		// These are meaningless on Windows.
-#ifndef _WIN32
+#ifndef DOSLIKE
 		if (pair->src_st.st_mode & (S_ISUID | S_ISGID)) {
 			// gzip rejects setuid and setgid files even
 			// when --force was used. bzip2 doesn't check
@@ -450,7 +461,7 @@ static void
 io_close_src(file_pair *pair, bool success)
 {
 	if (pair->src_fd != STDIN_FILENO && pair->src_fd != -1) {
-#ifdef _WIN32
+#ifdef DOSLIKE
 		(void)close(pair->src_fd);
 #endif
 
@@ -459,12 +470,12 @@ io_close_src(file_pair *pair, bool success)
 		// happens to get same inode number, which would make us
 		// unlink() wrong file.
 		//
-		// NOTE: Windows is an exception to this, because it doesn't
-		// allow unlinking files that are open. *sigh*
+		// NOTE: DOS-like systems are an exception to this, because
+		// they don't allow unlinking files that are open. *sigh*
 		if (success && !opt_keep_original)
 			io_unlink(pair->src_name, &pair->src_st);
 
-#ifndef _WIN32
+#ifndef DOSLIKE
 		(void)close(pair->src_fd);
 #endif
 	}
@@ -480,7 +491,7 @@ io_open_dest(file_pair *pair)
 		// We don't modify or free() this.
 		pair->dest_name = (char *)"(stdout)";
 		pair->dest_fd = STDOUT_FILENO;
-#ifdef _WIN32
+#ifdef DOSLIKE
 		setmode(STDOUT_FILENO, O_BINARY);
 #endif
 		return false;

src/xz/main.c

@@ -164,6 +164,29 @@ main(int argc, char **argv)
 	// that stdin, stdout, and stderr are something valid.
 	io_init();
 
+#ifdef DOSLIKE
+	// Adjust argv[0] to make it look nicer in messages, and also to
+	// help the code in args.c.
+	{
+		// Strip the leading path.
+		char *p = argv[0] + strlen(argv[0]);
+		while (argv[0] < p && p[-1] != '/' && p[-1] != '\\')
+			--p;
+
+		argv[0] = p;
+
+		// Strip the .exe suffix.
+		p = strrchr(p, '.');
+		if (p != NULL)
+			*p = '\0';
+
+		// Make it lowercase.
+		for (p = argv[0]; *p != '\0'; ++p)
+			if (*p >= 'A' && *p <= 'Z')
+				*p = *p - 'A' + 'a';
+	}
+#endif
+
 	// Set up the locale.
 	setlocale(LC_ALL, "");
 

src/xz/message.c

@@ -207,6 +207,9 @@ message_init(const char *given_argv0)
 #ifdef _WIN32
 	timer_queue = CreateTimerQueue();
 #else
+#	ifndef SA_RESTART
+#		define SA_RESTART 0
+#	endif
 	// Establish the signal handler for SIGALRM. Since this signal
 	// doesn't require any quick action, we set SA_RESTART.
 	struct sigaction sa;

src/xz/suffix.c

@@ -19,6 +19,11 @@
 
 #include "private.h"
 
+// For case-insensitive filename suffix on case-insensitive systems
+#ifdef DOSLIKE
+#	define strcmp strcasecmp
+#endif
+
 
 static char *custom_suffix = NULL;
 

src/xzdec/xzdec.c

@@ -24,8 +24,9 @@
 #include <stdio.h>
 #include <unistd.h>
 
-#ifdef _WIN32
+#ifdef DOSLIKE
 #	include <fcntl.h>
+#	include <io.h>
 #endif
 
 #include "getopt.h"
@@ -408,7 +409,7 @@ main(int argc, char **argv)
 	lzma_stream strm = LZMA_STREAM_INIT;
 
 	// Some systems require setting stdin and stdout to binary mode.
-#ifdef _WIN32
+#ifdef DOSLIKE
 	setmode(fileno(stdin), O_BINARY);
 	setmode(fileno(stdout), O_BINARY);
 #endif