Added the POSIX functions opendir() and closedir().

git-svn-id: svn://svn.cc65.org/cc65/trunk@5666 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/cbm/Makefile

@@ -31,7 +31,8 @@ CFLAGS	= -Osir -g -T -t $(SYS) --forget-inc-paths -I . -I ../../include
 
 C_OBJS =       	cbm_dir.o       \
                 cbm_load.o	\
-		cbm_save.o
+		cbm_save.o      \
+                opendir.o
 
 S_OBJS =	c_acptr.o	\
 	 	c_basin.o 	\
@@ -44,13 +45,13 @@ S_OBJS =	c_acptr.o	\
 		c_clrch.o 	\
 		c_iobase.o	\
 		c_listen.o	\
-		c_load.o	\
+		c_load.o 	\
 		c_open.o 	\
 		c_readst.o 	\
-		c_save.o	\
+		c_save.o 	\
 		c_setlfs.o	\
 		c_setnam.o	\
-		c_talk.o	\
+		c_talk.o 	\
 		c_unlsn.o	\
 		c_untlk.o	\
 		cbm_close.o	\
@@ -59,9 +60,10 @@ S_OBJS =	c_acptr.o	\
 		cbm_write.o     \
 		cclear.o 	\
 		chline.o 	\
-	 	clock.o 	\
+	 	clock.o  	\
                 close.o         \
-		ctype.o 	\
+                closedir.o      \
+		ctype.o  	\
 		cvline.o 	\
                 diskcmd.o       \
                 exehdr.o        \

libsrc/cbm/closedir.s

@@ -0,0 +1,53 @@
+;
+; Ullrich von Bassewitz, 2012-05-30
+;
+; Based on C code by Groepaz
+;
+; int __fastcall__ closedir(DIR *dir);
+;
+
+
+        .include        "dir.inc"
+        .include        "zeropage.inc"
+
+        .import         _close, _free
+
+
+.proc   _closedir
+
+        sta     ptr1
+        stx     ptr1+1
+
+; Load dir->fd
+
+        ldy     #DIR::fd+1
+        lda     (ptr1),y
+        tax
+        dey
+        lda     (ptr1),y
+
+; Close the file
+
+        jsr     _close
+
+; Save the error code
+
+        pha
+        txa
+        pha
+
+; Free the memory block
+
+        lda     ptr1
+        ldx     ptr1+1
+        jsr     _free
+
+; Return the error code from close()
+
+        pla
+        tax
+        pla
+        rts
+
+.endproc
+

libsrc/cbm/dir.inc

@@ -0,0 +1,27 @@
+;
+; Internal include file, do not use directly.
+; Written by Ullrich von Bassewitz. Based on C code by Groepaz.
+;
+
+
+
+;------------------------------------------------------------------------------
+; Data structures
+
+.struct DIR
+    fd          .word
+    offs        .word
+    name        .byte   16+1
+.endstruct
+
+
+;------------------------------------------------------------------------------
+; C callable functions
+
+        .global _opendir
+        .global _closedir
+        .global _readdir
+        .global _telldir
+        .global _rewinddir
+
+

libsrc/cbm/opendir.c

@@ -0,0 +1,52 @@
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include "dir.h"
+
+
+
+DIR* __fastcall__ opendir (const char*)
+{
+    unsigned char buffer[8+16+1+7];
+    int count;
+    DIR d;
+    DIR* dir = 0;
+
+    /* Setup file name and offset */
+    d.name[0] = '$';
+    d.name[1] = '\0';
+    d.offs    = 0;
+
+    /* Open the directory on disk for reading */
+    d.fd = open (d.name, O_RDONLY);
+    if (d.fd >= 0) {
+
+        /* Skip the disk header */
+        count = read (d.fd, buffer, sizeof (buffer));
+        if (count == sizeof (buffer)) {
+
+            /* Allocate memory for the DIR structure returned */
+            dir = malloc (sizeof (*dir));
+
+            /* Copy the contents of d */
+            if (dir) {
+                memcpy (dir, &d, sizeof (d));
+            } else {
+                /* Set an appropriate error code */
+                errno = ENOMEM;
+            }
+        } else if (count >= 0) {
+            /* Short read - need to set an error code */
+            errno = EIO;
+        }
+    }
+
+    /* Done */
+    return dir;
+}
+
+
+