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Improved cbm_dir routines by Thomas Giesel.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4264 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-09-28 22:01:58 +00:00
parent 01a11b2dd9
commit d54a1ba3d2
2 changed files with 93 additions and 81 deletions
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20
include/cbm.h
View File

@ -117,15 +117,17 @@ extern unsigned char _filetype; /* Default 'u' */
/* 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 */
#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_RESERVED 7 /* Not used, but kept free for compatibility */
#define CBM_T_VRP 8 /* Vorpal fast-loadable format */
#define CBM_T_OTHER 9 /* Other file-types not yet defined */
#define CBM_T_HEADER 10 /* Disk header / title */
/* CBM FILE ACCESS */
#define CBM_A_RO 1 /* Read only */

154
libsrc/cbm/cbm_dir.c
View File

@ -38,40 +38,62 @@ unsigned char __fastcall__ cbm_opendir (unsigned char lfn, unsigned char device)
unsigned char __fastcall__ cbm_readdir (unsigned char lfn, register struct cbm_dirent* l_dirent)
{
unsigned char byte, i;
unsigned char rv;
unsigned char is_header;
static const unsigned char types[] = {
CBM_T_OTHER, CBM_T_OTHER, CBM_T_CBM, CBM_T_DIR, /* a b c d */
CBM_T_OTHER, CBM_T_OTHER, CBM_T_OTHER, CBM_T_OTHER, /* e f g h */
CBM_T_OTHER, CBM_T_OTHER, CBM_T_OTHER, CBM_T_OTHER, /* i j k l */
CBM_T_OTHER, CBM_T_OTHER, CBM_T_OTHER, CBM_T_PRG, /* m n o p */
CBM_T_OTHER, CBM_T_REL, CBM_T_SEQ, CBM_T_OTHER, /* q r s t */
CBM_T_USR, CBM_T_VRP /* u v */
};
if (cbm_k_chkin (lfn) == 0) {
if (cbm_k_readst () == 0) {
cbm_k_basin (); /* 0x01, 0x01, next basic line */
cbm_k_basin ();
rv = 1;
is_header = 0;
byte = cbm_k_basin(); /* File-size */
l_dirent->size = byte | ((cbm_k_basin()) << 8);
if (!cbm_k_chkin(lfn)) {
if (!cbm_k_readst()) {
/* skip 2 bytes, next basic line pointer */
cbm_k_basin();
cbm_k_basin();
/* File-size */
l_dirent->size = cbm_k_basin() | ((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 ();
/* "B" BLOCKS FREE. */
if (byte == 'b') {
/* Read until end, careless callers may call us again */
while (!cbm_k_readst()) {
cbm_k_basin();
}
cbm_k_clrch ();
return 2; /* END */
rv = 2; /* EOF */
goto ret_val;
}
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 */
} /* ### */
/* reverse text shows that this is the directory header */
if (byte == 0x12) { /* RVS_ON */
is_header = 1;
}
while (byte != '\"') {
byte = cbm_k_basin();
/* prevent endless loop */
if (cbm_k_readst()) {
rv = 3;
goto ret_val;
}
}
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 */
} /* ### */
while ((byte = cbm_k_basin()) != '\"') {
/* prevent endless loop */
if (cbm_k_readst()) {
rv = 4;
goto ret_val;
}
if (i < sizeof (l_dirent->name) - 1) {
l_dirent->name[i] = byte;
@ -80,61 +102,49 @@ unsigned char __fastcall__ cbm_readdir (unsigned char lfn, register struct cbm_d
}
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 */
} /* ### */
while ((byte = cbm_k_basin()) == ' ') {
/* prevent endless loop */
if (cbm_k_readst()) {
rv = 5;
goto ret_val;
}
}
cbm_k_clrch ();
return 0; /* Line read successfuly */
if (is_header) {
l_dirent->type = CBM_T_HEADER;
} else {
if (byte >= 'a' && byte < 'a' + sizeof(types)) {
l_dirent->type = types[byte - 'a'];
} else {
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;
}
/* read to end of line */
while (byte != 0) {
byte = cbm_k_basin();
/* prevent endless loop */
if (cbm_k_readst()) {
rv = 6;
goto ret_val;
}
}
rv = 0;
goto ret_val;
}
}
cbm_k_clrch ();
return 1;
ret_val:
cbm_k_clrch();
return rv;
}