Add support for UNC style paths (David Bolen)

git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@604 6ac86273-5f31-0410-b378-82cca8765d1b

docs/history.txt

@@ -16,6 +16,9 @@
     * distinguish between the builtin DOS version and the settable
       DOS version.
     * console.asm now accepts extended scancodes (modified by Bart)
+    * added BOOTONLY option to SYS (modified by Bart)
++ Changes David Bolen
+    * add support for UNC-style paths (that start with "\\")
 + Changes Bart
     * flip some slashes in drivers/*.asm 
       (enables cross-assembly on Linux)

kernel/dosfns.c

@@ -92,7 +92,7 @@ STATIC int remote_lock_unlock(sft FAR *sftp,  /* SFT for file */
 /* get current directory structure for drive
    return NULL if the CDS is not valid or the
    drive is not within range */
-struct cds FAR *get_cds(int drive)
+struct cds FAR *get_cds(unsigned drive)
 {
   struct cds FAR *cdsp;
   unsigned flags;
@@ -966,7 +966,8 @@ COUNT DosChangeDir(BYTE FAR * s)
     return result;
   }
 
-  if (strlen(PriPathName) > sizeof(current_ldt->cdsCurrentPath) - 1)
+  if ((FP_OFF(current_ldt) != 0xFFFF) &&
+      (strlen(PriPathName) > sizeof(current_ldt->cdsCurrentPath) - 1))
     return DE_PATHNOTFND;
 
 #if defined(CHDIR_DEBUG)
@@ -988,8 +989,12 @@ COUNT DosChangeDir(BYTE FAR * s)
         SHSUCdX needs this. jt
 */
   fstrcpy(current_ldt->cdsCurrentPath, PriPathName);
-  if (PriPathName[7] == 0)
-    current_ldt->cdsCurrentPath[8] = 0; /* Need two Zeros at the end */
+  if (FP_OFF(current_ldt) != 0xFFFF)
+  {
+     fstrcpy(current_ldt->cdsCurrentPath, PriPathName);
+     if (PriPathName[7] == 0)
+       current_ldt->cdsCurrentPath[8] = 0; /* Need two Zeros at the end */
+  }
   return SUCCESS;
 }
 
@@ -1271,7 +1276,7 @@ COUNT DosRenameTrue(BYTE * path1, BYTE * path2, int attrib)
   {
     return DE_DEVICE; /* not same device */
   }
-  if (current_ldt->cdsFlags & CDSNETWDRV)
+  if (FP_OFF(current_ldt) == 0xFFFF || (current_ldt->cdsFlags & CDSNETWDRV))
     return remote_rename();
 
   return dos_rename(path1, path2, attrib);

kernel/newstuff.c

@@ -108,7 +108,7 @@ int DosMkTmp(BYTE FAR * pathname, UWORD attr)
 #define DEBUG_TRUENAME
 #endif
 
-#define drLetterToNr(dr) ((dr) - 'A')
+#define drLetterToNr(dr) ((unsigned char)((dr) - 'A'))
 /* Convert an uppercased drive letter into the drive index */
 #define drNrToLetter(dr) ((dr) + 'A')
 /* the other direction */
@@ -117,22 +117,6 @@ int DosMkTmp(BYTE FAR * pathname, UWORD attr)
      is always a logical drive letter associated with a path
      spec. This letter is also the index into the CDS */
 
-COUNT get_verify_drive(const char FAR * src)
-{
-  int drive;
-
-  /* Do we have a drive?                                          */
-  if (src[1] == ':')
-    drive = drLetterToNr(DosUpFChar(src[0]));
-  else
-    drive = default_drive;
-
-  if (get_cds(drive) == NULL)
-    return DE_PATHNOTFND;
-    
-  return drive;
-}
-
 /* 
 	Definition of functions for the handling of the Current
 	Directory Structure.
@@ -260,7 +244,7 @@ COUNT get_verify_drive(const char FAR * src)
 
 #define addChar(c) \
 { \
-  if (p - dest >= SFTMAX) PATH_ERROR; /* path too long */	\
+  if (p >= dest + SFTMAX) PATH_ERROR; /* path too long */	\
   *p++ = c; \
 }
 
@@ -321,6 +305,7 @@ COUNT truename(const char FAR * src, char * dest, COUNT mode)
   struct cds FAR *cdsEntry;
   char *p = dest;	  /* dynamic pointer into dest */
   char *rootPos;
+  char src0;
   enum { DONT_ADD, ADD, ADD_UNLESS_LAST } addSep;
 
   tn_printf(("truename(%S)\n", src));
@@ -330,14 +315,37 @@ COUNT truename(const char FAR * src, char * dest, COUNT mode)
 
   /* In opposite of the TRUENAME shell command, an empty string is
      rejected by MS DOS 6 */
-  if (src[0] == '\0')
+  src0 = src[0];
+  if (src0 == '\0')
     return DE_FILENOTFND;
 
-  result = get_verify_drive(src);
-  if (result < SUCCESS)
-    return result;
+  if (src0 == '\\' && src[1] == '\\') {
+    const char FAR *unc_src = src;
+    /* Flag UNC paths and short circuit processing.  Set current LDT   */
+    /* to sentinel (offset 0xFFFF) for redirector processing.          */
+    tn_printf(("Truename: UNC detected\n"));
+    do {
+      src0 = unc_src[0];
+      addChar(src0);
+      unc_src++;
+    } while (src0);
+    current_ldt = (struct cds FAR *)MK_FP(0xFFFF,0xFFFF);
+    tn_printf(("Returning path: \"%s\"\n", dest));
+    /* Flag as network - drive bits are empty but shouldn't get */
+    /* referenced for network with empty current_ldt.           */
+    return IS_NETWORK;
+  }
+  
+  /* Do we have a drive?                                          */
+  if (src[1] == ':')
+    result = drLetterToNr(DosUpFChar(src0));
+  else
+    result = default_drive;
+
+  cdsEntry = get_cds(result);
+  if (cdsEntry == NULL)
+    return DE_PATHNOTFND;
 
-  cdsEntry = &CDSp[result];
   tn_printf(("CDS entry: #%u @%p (%u) '%S'\n", result, cdsEntry,
             cdsEntry->cdsBackslashOffset, cdsEntry->cdsCurrentPath));
   /* is the current_ldt thing necessary for compatibly??

kernel/proto.h

@@ -111,7 +111,7 @@ BOOL IsShareInstalled(void);
 COUNT DosLockUnlock(COUNT hndl, LONG pos, LONG len, COUNT unlock);
 sft FAR *idx_to_sft(int SftIndex);
 int get_sft_idx(UCOUNT hndl);
-struct cds FAR *get_cds(int dsk);
+struct cds FAR *get_cds(unsigned dsk);
 COUNT DosTruename(const char FAR * src, char FAR * dest);
 
 /*dosidle.asm */
@@ -340,7 +340,6 @@ VOID InitPSP(VOID);
 /* newstuff.c */
 int SetJFTSize(UWORD nHandles);
 int DosMkTmp(BYTE FAR * pathname, UWORD attr);
-COUNT get_verify_drive(const char FAR * src);
 COUNT truename(const char FAR * src, char * dest, COUNT t);
 
 /* network.c */

kernel/systime.c

@@ -92,6 +92,10 @@ void DosGetTime(struct dostime *dt)
 
 int DosSetTime(const struct dostime *dt)
 {
+  if (dt->hour > 23 || dt->minute > 59 ||
+      dt->second > 59 || dt->hundredth > 99)
+     return DE_INVLDDATA;
+ 
   /* for ClkRecord.clkDays */
   ExecuteClockDriverRequest(C_INPUT);