forked from PoliEcho-holding-org/kern
Tom-on
ff07696dc6
- Made stdio.h work - Moved printFiletable back into kernel.c - TODO: Add stdio.h to all files that should use it (probably next commmit) - Added some more global addresses. There's a memory layout, but i'm not using it - Got cursor to be drawn - Calc program now gets user input
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
#ifndef FILESYS_H
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#define FILESYS_H
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#include <disk/disk.h>
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#include <memory/addresses.h>
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#include <string.h>
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typedef struct {
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char filename[10];
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char filetype[3];
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uint8_t reserved;
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uint8_t startAddress;
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uint8_t length;
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} __attribute__ ((packed)) fileEntry_t;
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char* filetable = (char*)FILETABLE_LOC; // Pretty sure we don't have to care about the bootloader at 0x7c00
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fileEntry_t* findFile(const char* filename) {
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if (strlen(filename) > 14) { return NULL; } // Filename too long
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static char filenameBuf[16];
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strcpy(filenameBuf, filename);
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char* filetype = strchr(filenameBuf, '.');
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*filetype++ = '\0'; // Split filename and filetype by a NULL
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char* ft = filetable;
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while (*ft != '\0') {
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if (strcmp(filenameBuf, ft) != 0) { // Filename doesn't match
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ft += 16; // Goto next entry
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continue;
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}
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ft += 10; // Goto filetype
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if (strcmp(filetype, ft) != 0) {
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ft += 6; // Goto next entry
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continue;
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}
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ft -= 10; // Go back to start of entry
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return (fileEntry_t*)ft;
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}
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return NULL; // No such file
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}
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void updateFiletable() {
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// TODO: Update the filetable by writing data from memory to disk!
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}
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uint8_t readFile(char* filename, void* buffer) { // Hopefully the buffer is large enought :/
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fileEntry_t* file = findFile(filename);
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if (file == NULL) { return 1; } // File doesn't exist!
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diskRead(file->startAddress, file->length, buffer);
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return 0; // Success
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}
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uint8_t writeFile(char* filename, void* buffer) { // TODO: Add length so we don't write too much/too little
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fileEntry_t* file = findFile(filetable);
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if (file == NULL) { // File exists -> override
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// File doesn't exist -> create new file
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file = (fileEntry_t*)filetable;
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while (*(char*)file != '\0') { file++; } // Find end of the filetable
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*strchr(filename, '.') = '\0';
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char* filetype = filename + strlen(filename); // + 1?
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fileEntry_t* previous = file - 1;
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strcpy(file->filename, filename);
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strcpy(file->filetype, filetype);
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file->startAddress = previous->startAddress + previous->length;
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file->length = 1; // TODO: Add lenght! Currently will just assume 1 sector :/
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}
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diskWrite(file->startAddress, file->length, buffer); // Write the file
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return 0; // Success
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}
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#endif
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