78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/*
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* Simple program to modify the volume directory (block 2) of a ProDOS
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* volume to make the directory extensible to more than four blocks (51
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* entries) when using ProDOS 2.5 or later. This program can also revert
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* a volume with an extensible volume directory back to fixed-size directory
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* provided the directory is still exactly 4 blocks in length.
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*
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* Bobbi
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* March 2020
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*/
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#include <prodos.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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char buf[512];
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char str[128]; /* Should be enough */
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int main(int argc, char *argv[]) {
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puts("ProDOS 2.5+ Volume Directory Patching Utility");
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puts("---------------------------------------------");
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fputs("\nEnter device number> ", stdout);
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int dev;
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scanf("%u", &dev);
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BlockRec br;
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br.blockDevNum = dev;
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br.blockDataBuffer = buf;
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br.blockNum = 2;
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READ_BLOCK(&br);
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int rc = toolerror();
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if (rc) {
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printf("Block read failed, err=%x\n", rc);
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exit(255);
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}
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if ((buf[0x14] == 0) && (buf[0x15] == 0)) {
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puts("Fixed-size (4 block, 51 entry) volume directory");
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printf("Change to ProDOS 2.5+ extensible volume "
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"directory ('yes' to confirm)?");
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scanf("%s", str);
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if (strcasecmp(str, "yes") == 0) {
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buf[0x14] = 4;
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buf[0x15] = 0;
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WRITE_BLOCK(&br);
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int rc = toolerror();
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if (rc) {
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printf("Block write failed, err=%x\n", rc);
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exit(255);
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}
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puts("** Changed to extensible **");
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} else
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puts("No change made.");
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} else {
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printf("Extensible volume directory, currently %u blocks\n",
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buf[0x14] + 256U * buf[0x15]);
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if ((buf[0x14] == 4) && (buf[0x15] == 0)) {
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printf("Revert to classic ProDOS fixed-size volume "
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"directory ('yes' to confirm)?");
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scanf("%s", str);
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if (strcasecmp(str, "yes") == 0) {
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buf[0x14] = 0;
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buf[0x15] = 0;
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WRITE_BLOCK(&br);
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int rc = toolerror();
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if (rc) {
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printf("Block write failed, err=%x\n",
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rc);
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exit(255);
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}
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puts("** Changed to fixed-size **");
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} else
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puts("No change made.");
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}
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}
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return 0;
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}
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