Patch from Victor V. Vengerov <vvv@oktet.ru> to remove Linux code.

1 files changed, 273 insertions, 0 deletions

diff --git a/cpukit/libfs/src/dosfs/msdos_conv.c b/cpukit/libfs/src/dosfs/msdos_conv.c
new file mode 100644
index 0000000000..ed2c897d1a
--- /dev/null
+++ b/cpukit/libfs/src/dosfs/msdos_conv.c
@@ -0,0 +1,273 @@
+/*
+ * Adaptation of NetBSD code for RTEMS by Victor V. Vengerov <vvv@oktet.ru>
+ */
+/*	$NetBSD: msdosfs_conv.c,v 1.10 1994/12/27 18:36:24 mycroft Exp $	*/
+/*
+ * Written by Paul Popelka (paulp@uts.amdahl.com)
+ * 
+ * You can do anything you want with this software, just don't say you wrote
+ * it, and don't remove this notice.
+ * 
+ * This software is provided "as is".
+ * 
+ * The author supplies this software to be publicly redistributed on the
+ * understanding that the author is not responsible for the correct
+ * functioning of this software in any circumstances and is not liable for
+ * any damages caused by this software.
+ * 
+ * October 1992
+ */
+
+#include <rtems.h>
+#include "msdos.h"
+/*
+ * Days in each month in a regular year.
+ */
+static u_short regyear[] = {
+	31, 28, 31, 30, 31, 30,
+	31, 31, 30, 31, 30, 31
+};
+
+/*
+ * Days in each month in a leap year.
+ */
+static u_short leapyear[] = {
+	31, 29, 31, 30, 31, 30,
+	31, 31, 30, 31, 30, 31
+};
+
+/*
+ * Variables used to remember parts of the last time conversion.  Maybe we
+ * can avoid a full conversion.
+ */
+static u_long lasttime;
+static u_long lastday;
+static u_short lastddate;
+static u_short lastdtime;
+
+/*
+ * Convert the unix version of time to dos's idea of time to be used in
+ * file timestamps. The passed in unix time is assumed to be in GMT.
+ */
+void
+msdos_date_unix2dos(unsigned int t, unsigned short *ddp, 
+                    unsigned short *dtp)
+{
+	u_long days;
+	u_long inc;
+	u_long year;
+	u_long month;
+	u_short *months;
+
+	/*
+	 * If the time from the last conversion is the same as now, then
+	 * skip the computations and use the saved result.
+	 */
+	if (lasttime != t) {
+		lasttime = t;
+		lastdtime = (((t % 60) >> 1) << MSDOS_DT_2SECONDS_SHIFT)
+		    + (((t / 60) % 60) << MSDOS_DT_MINUTES_SHIFT)
+		    + (((t / 3600) % 24) << MSDOS_DT_HOURS_SHIFT);
+
+		/*
+		 * If the number of days since 1970 is the same as the last
+		 * time we did the computation then skip all this leap year
+		 * and month stuff.
+		 */
+		days = t / (24 * 60 * 60);
+		if (days != lastday) {
+			lastday = days;
+			for (year = 1970;; year++) {
+				inc = year & 0x03 ? 365 : 366;
+				if (days < inc)
+					break;
+				days -= inc;
+			}
+			months = year & 0x03 ? regyear : leapyear;
+			for (month = 0; month < 12; month++) {
+				if (days < months[month])
+					break;
+				days -= months[month];
+			}
+			lastddate = ((days + 1) << MSDOS_DD_DAY_SHIFT)
+			    + ((month + 1) << MSDOS_DD_MONTH_SHIFT);
+			/*
+			 * Remember dos's idea of time is relative to 1980.
+			 * unix's is relative to 1970.  If somehow we get a
+			 * time before 1980 then don't give totally crazy
+			 * results.
+			 */
+			if (year > 1980)
+				lastddate += (year - 1980) << 
+				             MSDOS_DD_YEAR_SHIFT;
+		}
+	}
+	*dtp = lastdtime;
+	*ddp = lastddate;
+}
+
+/*
+ * The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
+ * interval there were 8 regular years and 2 leap years.
+ */
+#define	SECONDSTO1980	(((8 * 365) + (2 * 366)) * (24 * 60 * 60))
+
+static u_short lastdosdate;
+static u_long lastseconds;
+
+/*
+ * Convert from dos' idea of time to unix'. This will probably only be
+ * called from the stat(), and fstat() system calls and so probably need
+ * not be too efficient.
+ */
+unsigned int
+msdos_date_dos2unix(unsigned int dd, unsigned int dt)
+{
+	u_long seconds;
+	u_long m, month;
+	u_long y, year;
+	u_long days;
+	u_short *months;
+
+	seconds = ((dt & MSDOS_DT_2SECONDS_MASK) >> MSDOS_DT_2SECONDS_SHIFT)
+	    + ((dt & MSDOS_DT_MINUTES_MASK) >> MSDOS_DT_MINUTES_SHIFT) * 60
+	    + ((dt & MSDOS_DT_HOURS_MASK) >> MSDOS_DT_HOURS_SHIFT) * 3600;
+	/*
+	 * If the year, month, and day from the last conversion are the
+	 * same then use the saved value.
+	 */
+	if (lastdosdate != dd) {
+		lastdosdate = dd;
+		days = 0;
+		year = (dd & MSDOS_DD_YEAR_MASK) >> MSDOS_DD_YEAR_SHIFT;
+		for (y = 0; y < year; y++)
+			days += y & 0x03 ? 365 : 366;
+		months = year & 0x03 ? regyear : leapyear;
+		/*
+		 * Prevent going from 0 to 0xffffffff in the following
+		 * loop.
+		 */
+		month = (dd & MSDOS_DD_MONTH_MASK) >> MSDOS_DD_MONTH_SHIFT;
+		if (month == 0) {
+			month = 1;
+		}
+		for (m = 0; m < month - 1; m++)
+			days += months[m];
+		days += ((dd & MSDOS_DD_DAY_MASK) >> MSDOS_DD_DAY_SHIFT) - 1;
+		lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
+	}
+	return seconds + lastseconds;
+}
+
+/*
+ * Cheezy macros to do case detection and conversion for the ascii
+ * character set.  DOESN'T work for ebcdic.
+ */
+#define	isupper(c)	(c >= 'A'  &&  c <= 'Z')
+#define	islower(c)	(c >= 'a'  &&  c <= 'z')
+#define	toupper(c)	(c & ~' ')
+#define	tolower(c)	(c | ' ')
+
+static const u_char msdos_map[] = {
+/* 00 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* 08 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* 10 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* 18 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* 20 */ 0x00, 0x21, 0x00, 0x23, 0x24, 0x25, 0x26, 0x27, /*  !"#$%&' */
+/* 28 */ 0x28, 0x29, 0x00, 0x00, 0x00, 0x2D, 0x2E, 0x00, /* ()*+,-./ */
+/* 30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 01234567 */
+/* 38 */ 0x38, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 89:;<=>? */
+/* 40 */ 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* @ABCDEFG */
+/* 48 */ 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, /* HIJKLMNO */
+/* 50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* PQRSTUVW */
+/* 58 */ 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x00, 0x5E, 0x5F, /* XYZ[\]^_ */
+/* 60 */ 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* `abcdefg */
+/* 68 */ 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, /* hijklmno */
+/* 70 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* pqrstuvw */
+/* 78 */ 0x58, 0x59, 0x5A, 0x5B, 0x7C, 0x00, 0x7E, 0x00, /* xyz{|}~  */
+/* 80 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* 88 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* 90 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* 98 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* A0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* A8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* B0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* B8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* C0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* C8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* D0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* D8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* E0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* E8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* F0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* F8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+/*
+ * Convert a unix filename to a DOS filename. Return -1 if wrong name is
+ * supplied.
+ */
+int
+msdos_filename_unix2dos(char *un, int unlen, char *dn)
+{
+	int i;
+	u_char c;
+
+	/*
+	 * Fill the dos filename string with blanks. These are DOS's pad
+	 * characters.
+	 */
+	for (i = 0; i <= 10; i++)
+		dn[i] = ' ';
+
+	/*
+	 * The filenames "." and ".." are handled specially, since they
+	 * don't follow dos filename rules.
+	 */
+	if (un[0] == '.' && unlen == 1) {
+		dn[0] = '.';
+		return 0;
+	}
+	if (un[0] == '.' && un[1] == '.' && unlen == 2) {
+		dn[0] = '.';
+		dn[1] = '.';
+		return 0;
+	}
+
+	/*
+	 * Copy the unix filename into the dos filename string upto the end
+	 * of string, a '.', or 8 characters. Whichever happens first stops
+	 * us. This forms the name portion of the dos filename. Fold to
+	 * upper case.
+	 */
+	for (i = 0; i <= 7 && unlen && (c = *un) && c != '.'; i++) {
+		if ((dn[i] = msdos_map[c]) == 0)
+                        return -1;
+		un++;
+		unlen--;
+	}
+
+	/*
+	 * Strip any further characters up to a '.' or the end of the
+	 * string.
+	 */
+	while (unlen && (c = *un)) {
+		un++;
+		unlen--;
+		/* Make sure we've skipped over the dot before stopping. */
+		if (c == '.')
+			break;
+	}
+
+	/*
+	 * Copy in the extension part of the name, if any. Force to upper
+	 * case. Note that the extension is allowed to contain '.'s.
+	 * Filenames in this form are probably inaccessable under dos.
+	 */
+	for (i = 8; i <= 10 && unlen && (c = *un); i++) {
+		if ((dn[i] = msdos_map[c]) == 0)
+		        return -1;
+		un++;
+		unlen--;
+	}
+	return 0;
+}