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Implement fseek

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This commit is contained in:
Alex 2023-05-05 19:19:44 +03:00
parent d0ec077c09
commit f48511c6ff
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
3 changed files with 8 additions and 16 deletions
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3
libc/include/stdio.h
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@ -3,6 +3,7 @@
#include <stdarg.h>
#include <stddef.h>
#include <sys/stat.h>
#define SEEK_SET 0
#define SEEK_CUR 1
@ -29,7 +30,7 @@ extern "C"
FILE *fopen(const char *filename, const char *mode);
size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
int fseek(FILE *stream, long offset, int whence);
off_t fseek(FILE *stream, long offset, int whence);
long ftell(FILE *stream);
int fclose(FILE *fp);
int fflush(FILE *stream);

2
libc/include/sys/stat.h
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@ -4,7 +4,7 @@
typedef unsigned int _dev_t;
typedef unsigned short _ino_t;
typedef unsigned short _mode_t;
typedef int _off_t;
typedef long _off_t;
#define dev_t _dev_t
#define ino_t _ino_t

19
libc/src/std/io/file.c
View File

@ -35,22 +35,13 @@ int fclose(FILE *fp)
return syscall1(_FileClose, (uint64_t)KP);
}
int fseek(FILE *stream, long offset, int whence)
off_t fseek(FILE *stream, long offset, int whence)
{
switch (whence)
{
case SEEK_SET:
stream->offset = offset;
break;
case SEEK_CUR:
break;
case SEEK_END:
// stream->offset = syscall1(_FileLength, (uint64_t)File->KernelPrivate) + offset;
break;
default:
off_t new_offset = syscall3(_FileSeek, stream->KernelPrivate, offset, whence);
if (IsSyscallError(new_offset))
return -1;
}
return stream->offset;
stream->offset = new_offset;
return new_offset;
}
long ftell(FILE *stream)