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CBM directory routines by Josef Soucek

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1920 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2003-02-02 13:18:40 +00:00
parent 70e920f84c
commit 90f47ed007
4 changed files with 194 additions and 2 deletions
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46
include/cbm.h
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@ -110,6 +110,36 @@ extern unsigned char _filetype; /* Default 'u' */
/*****************************************************************************/
/* Definitions for directory reading functions */
/*****************************************************************************/
/* CBM FILE TYPES */
#define CBM_T_DEL 0
#define CBM_T_SEQ 1
#define CBM_T_PRG 2
#define CBM_T_USR 3
#define CBM_T_REL 4
#define CBM_T_CBM 5 /* 1581 sub-partition */
#define CBM_T_DIR 6 /* IDE64 and CMD sub-directory */
#define CBM_T_VRP 8 /* Vorpal fast-loadable format */
#define CBM_T_OTHER 5 /* Other file-types not yet defined */
/* CBM FILE ACCESS */
#define CBM_A_RO 1 /* Read only */
#define CBM_A_RW 3 /* Read, Write */
struct cbm_dirent {
char name[17]; /* File name in PETSCII, limited to 16 chars */
unsigned int size; /* Size in 256B blocks */
unsigned char type;
unsigned char access;
};
/*****************************************************************************/
/* Machine info */
/*****************************************************************************/
@ -219,9 +249,23 @@ int __fastcall__ cbm_read (unsigned char lfn, void* buffer, unsigned int size);
int __fastcall__ cbm_write (unsigned char lfn, void* buffer, unsigned int size);
/* Writes up to "size" bytes from "buffer" to a file.
* Returns the number of actually written bytes or -1 in case of an error.
* _oserror contains an errorcode then (see table below).
* _oserror contains an errorcode then (see above table).
*/
unsigned char __fastcall__ cbm_opendir (unsigned char lfn, unsigned char device);
/* Opens directory listing.
* Returns 0 if opening directory was successful,
* othervise errorcode corresponding to cbm_open()
*/
unsigned char __fastcall__ cbm_readdir (unsigned char lfn, struct cbm_dirent* l_dirent);
/* Reads one directory line into cbm_dirent structure.
* Returns 0 if reading directory line was successful.
* Returns 'true' if reading directory failed or no more files to read.
*/
void __fastcall__ cbm_closedir (unsigned char lfn);
/* Closes directory by cbm_close (unsigned char lfn) */

1
libsrc/cbm/.cvsignore
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@ -1,2 +1,3 @@
cbm_dir.s
cbm_load.s
cbm_save.s

3
libsrc/cbm/Makefile
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@ -11,7 +11,8 @@
%.o: %.s
@$(AS) -g -o $@ $(AFLAGS) $<
C_OBJS = cbm_load.o \
C_OBJS = cbm_dir.o \
cbm_load.o \
cbm_save.o
S_OBJS = c_acptr.o \

146
libsrc/cbm/cbm_dir.c Normal file
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@ -0,0 +1,146 @@
/* This is very simplified version of POSIX opendir(), readdir() and closedir() */
/* for Commodore computers. */
/* Created by Josef Soucek, 2003 E-mail:josef.soucek@ct.cz */
/* Version 0.1 - 21.1.2003 */
/* Tested with floppy drive and IDE64 devices */
/* Not tested with messed (buggy) directory listing */
/* Limits filenames to 16 chars (VICE supports more in directory listing) */
#include <cbm.h>
unsigned char __fastcall__ cbm_opendir (unsigned char lfn, unsigned char device)
{
unsigned char status;
if ((status = cbm_open (lfn, device, CBM_READ, "$")) == 0) {
if (cbm_k_chkin (lfn) == 0) {
if (cbm_k_basin () == 0x01) { /* Start address */
if (cbm_k_basin () == 0x04) {
cbm_k_clrch ();
return 0;
}
} else {
cbm_close (lfn);
cbm_k_clrch ();
return 2;
}
}
}
return status;
}
unsigned char __fastcall__ cbm_readdir (unsigned char lfn, register struct cbm_dirent* l_dirent)
{
unsigned char byte, i;
if (cbm_k_chkin (lfn) == 0) {
if (cbm_k_readst () == 0) {
cbm_k_basin (); /* 0x01, 0x01, next basic line */
cbm_k_basin ();
byte = cbm_k_basin(); /* File-size */
l_dirent->size = byte | ((cbm_k_basin()) << 8);
byte = cbm_k_basin();
if (byte == 'b') { /* "B" BLOCKS FREE. */
while (cbm_k_readst () == 0) { /* Read until end */
cbm_k_basin ();
}
cbm_k_clrch ();
return 2; /* END */
}
if (byte != '\"') {
while (cbm_k_basin() != '\"') {
if (cbm_k_readst () != 0) { /* ### Included to prevent */
cbm_k_clrch (); /* ### Endless loop */
return 3; /* ### Should be probably removed */
} /* ### */
}
}
i = 0;
while ((byte = cbm_k_basin ()) != '\"') {
if (cbm_k_readst () != 0) { /* ### Included to prevent */
cbm_k_clrch (); /* ### Endless loop */
return 4; /* ### Should be probably removed */
} /* ### */
if (i < sizeof (l_dirent->name) - 1) {
l_dirent->name[i] = byte;
++i;
}
}
l_dirent->name[i] = '\0';
while ((byte=cbm_k_basin ()) == ' ') {
if (cbm_k_readst ()) { /* ### Included to prevent */
cbm_k_clrch (); /* ### Endless loop */
return 5; /* ### Should be probably removed */
} /* ### */
}
switch (byte) {
case 's':
l_dirent->type = CBM_T_SEQ;
break;
case 'p':
l_dirent->type = CBM_T_PRG;
break;
case 'u':
l_dirent->type = CBM_T_USR;
break;
case 'r':
l_dirent->type = CBM_T_REL;
break;
case 'c':
l_dirent->type = CBM_T_CBM;
break;
case 'd':
l_dirent->type = CBM_T_DIR;
break;
case 'v':
l_dirent->type = CBM_T_VRP;
break;
default:
l_dirent->type = CBM_T_OTHER;
}
cbm_k_basin ();
cbm_k_basin ();
byte = cbm_k_basin ();
l_dirent->access = (byte == 0x3C)? CBM_A_RO : CBM_A_RW;
if (byte != 0) {
while (cbm_k_basin() != 0) {
if (cbm_k_readst () != 0) { /* ### Included to prevent */
cbm_k_clrch (); /* ### Endless loop */
return 6; /* ### Should be probably removed */
} /* ### */
}
}
cbm_k_clrch ();
return 0; /* Line read successfuly */
}
}
cbm_k_clrch ();
return 1;
}
void __fastcall__ cbm_closedir( unsigned char lfn)
{
cbm_close(lfn);
}