forked from PoliEcho-holding-org/kern
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
#ifndef _FILEIO_H
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#define _FILEIO_H
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#include <syscall.h>
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#include <stdlib.h>
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#include <stddef.h>
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// Nobody should have to interface with the internals of this structure
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typedef struct _iobuf { // 24B
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unsigned char* _ptr; // File buffer base
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unsigned int _size; // Size of buffer
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int _offset; // Offset into file
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unsigned short _flag; // Open flags
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int _file; // File descriptor
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char __reserved[6];
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} FILE;
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FILE* stdin;
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FILE* stdout;
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FILE* stderr;
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FILE* fopen(const char* filename, const char* mode) {
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int oflag = O_RDWR | O_CREAT | O_BIN; // TODO!
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int fd = open(filename, oflag);
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if (fd < 0) {
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printf(""); // TODO: i'd prefer if i didn't need this
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return NULL;
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}
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// TODO: Somehow get the open file table
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FILE* fp = malloc(sizeof(FILE));
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fp->_file = fd;
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return fp;
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}
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int fclose(FILE* stream) {
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int res = close(stream->_file);
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return res;
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}
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size_t fread(void* ptr, size_t size, size_t count, FILE* stream) {
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unsigned int offset = 0;
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size_t readEl = 0;
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int fd = stream->_file;
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while (readEl != count) {
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if (read(fd, (void*)(ptr + offset), size) != size) break;
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offset += size;
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readEl++;
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}
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return readEl;
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}
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size_t fwrite(const void* ptr, size_t size, size_t count, FILE* stream) {
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unsigned int offset = 0;
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size_t writtenEl = 0;
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int fd = stream->_file;
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while (writtenEl != count) {
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if (write(fd, (void*)(ptr + offset), size) != size) break;
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offset += size;
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writtenEl++;
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}
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return writtenEl;
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}
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int fseek(FILE* stream, long int origin, int offset) {
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// TODO
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return -1;
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}
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long int ftell(FILE* stream) {
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// TODO
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return -1;
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}
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#endif
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