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https://github.com/cc65/cc65.git
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147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
/* This is very simplified version of POSIX opendir(), readdir() and closedir() */
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/* for Commodore computers. */
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/* Created by Josef Soucek, 2003 E-mail:josef.soucek@ct.cz */
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/* Version 0.1 - 21.1.2003 */
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/* Tested with floppy drive and IDE64 devices */
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/* Not tested with messed (buggy) directory listing */
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/* Limits filenames to 16 chars (VICE supports more in directory listing) */
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#include <cbm.h>
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unsigned char __fastcall__ cbm_opendir (unsigned char lfn, unsigned char device)
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{
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unsigned char status;
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if ((status = cbm_open (lfn, device, CBM_READ, "$")) == 0) {
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if (cbm_k_chkin (lfn) == 0) {
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if (cbm_k_basin () == 0x01) { /* Start address */
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if (cbm_k_basin () == 0x04) {
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cbm_k_clrch ();
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return 0;
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}
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} else {
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cbm_close (lfn);
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cbm_k_clrch ();
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return 2;
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}
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}
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}
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return status;
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}
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unsigned char __fastcall__ cbm_readdir (unsigned char lfn, register struct cbm_dirent* l_dirent)
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{
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unsigned char byte, i;
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if (cbm_k_chkin (lfn) == 0) {
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if (cbm_k_readst () == 0) {
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cbm_k_basin (); /* 0x01, 0x01, next basic line */
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cbm_k_basin ();
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byte = cbm_k_basin(); /* File-size */
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l_dirent->size = byte | ((cbm_k_basin()) << 8);
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byte = cbm_k_basin();
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if (byte == 'b') { /* "B" BLOCKS FREE. */
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while (cbm_k_readst () == 0) { /* Read until end */
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cbm_k_basin ();
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}
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cbm_k_clrch ();
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return 2; /* END */
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}
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if (byte != '\"') {
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while (cbm_k_basin() != '\"') {
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if (cbm_k_readst () != 0) { /* ### Included to prevent */
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cbm_k_clrch (); /* ### Endless loop */
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return 3; /* ### Should be probably removed */
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} /* ### */
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}
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}
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i = 0;
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while ((byte = cbm_k_basin ()) != '\"') {
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if (cbm_k_readst () != 0) { /* ### Included to prevent */
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cbm_k_clrch (); /* ### Endless loop */
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return 4; /* ### Should be probably removed */
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} /* ### */
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if (i < sizeof (l_dirent->name) - 1) {
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l_dirent->name[i] = byte;
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++i;
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}
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}
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l_dirent->name[i] = '\0';
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while ((byte=cbm_k_basin ()) == ' ') {
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if (cbm_k_readst ()) { /* ### Included to prevent */
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cbm_k_clrch (); /* ### Endless loop */
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return 5; /* ### Should be probably removed */
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} /* ### */
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}
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switch (byte) {
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case 's':
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l_dirent->type = CBM_T_SEQ;
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break;
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case 'p':
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l_dirent->type = CBM_T_PRG;
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break;
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case 'u':
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l_dirent->type = CBM_T_USR;
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break;
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case 'r':
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l_dirent->type = CBM_T_REL;
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break;
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case 'c':
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l_dirent->type = CBM_T_CBM;
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break;
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case 'd':
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l_dirent->type = CBM_T_DIR;
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break;
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case 'v':
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l_dirent->type = CBM_T_VRP;
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break;
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default:
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l_dirent->type = CBM_T_OTHER;
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}
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cbm_k_basin ();
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cbm_k_basin ();
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byte = cbm_k_basin ();
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l_dirent->access = (byte == 0x3C)? CBM_A_RO : CBM_A_RW;
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if (byte != 0) {
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while (cbm_k_basin() != 0) {
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if (cbm_k_readst () != 0) { /* ### Included to prevent */
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cbm_k_clrch (); /* ### Endless loop */
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return 6; /* ### Should be probably removed */
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} /* ### */
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}
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}
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cbm_k_clrch ();
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return 0; /* Line read successfuly */
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}
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}
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cbm_k_clrch ();
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return 1;
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}
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void __fastcall__ cbm_closedir( unsigned char lfn)
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{
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cbm_close(lfn);
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}
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