osdev/kernel_filesystem.c at master · cstack/osdev · GitHub

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#include"kernel_filesystem.h"

#include"memory.h"
#include"kernel_stdio.h"
#include"stdlib.h"
#include"stdlib/string.h"

structfile_t*first_file;
structfile_t*last_file;

structfile_t*parse_file(char**cursor) {
if (strncmp(*cursor, "FILE ", 5) !=0) {
fprintf(LOG, "ERROR: First bytes of metadata should be `FILE ` but were `");
for (inti=0; i<5; i++) {
fprintf(LOG, "%c", (*cursor)[i]);
 }
fprintf(LOG, "`\n");
fprintf(LOG, "strncmp returned %i\n", strncmp(*cursor, "FILE ", 5));
fprintf(LOG, "cursor: %s", cursor);
while(1){}
 }
 (*cursor) +=5;

structfile_t*file=malloc(sizeof(structfile_t));

uint32_tfile_name_length=0;
while (*(*cursor) !=' '&&file_name_length<FILE_NAME_MAX_LENGTH) {
file->name[file_name_length] =*(*cursor);
 (*cursor)++;
file_name_length++;
 }
 (*cursor)++;

uint32_tfile_size=atoi(*cursor);
file->size=file_size;
while (*(*cursor) !='\n') {
 (*cursor)++;
 }
 (*cursor)++;
file->bytes= (*cursor);

 (*cursor) +=file->size+1;

returnfile;
}

voidinitialize_filesystem(structmodule*mod) {
void*mod_virtual_start= (void*) (mod->mod_start+UPPER_GB_START);
char*mod_virtual_end= (mod->mod_end+UPPER_GB_START);
char*cursor= (char*) mod_virtual_start;

while (cursor<mod_virtual_end) {
structfile_t*new_file=parse_file(&cursor);
if (!first_file) {
first_file=new_file;
 }
if (last_file) {
last_file->next_sibling=new_file;
 } else {
last_file=new_file;
 }
 }
}

structfile_t*get_file(char*name) {
structfile_t*file=first_file;

while (file) {
if (strcmp(file->name, name) ==0) {
returnfile;
 }
file=file->next_sibling;
 }

return0;
}

structfile_t*get_first_file() {
returnfirst_file;
}