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[lib/c] Add fseek() and rewind()

--- a/lib/c/src/Makefile

+++ b/lib/c/src/Makefile

@@ -8,7 +8,7 @@

       fgets.o gets.of fgetc.o fputc.o getchar.o putchar.o \

       fputs.o puts.o fread.o fwrite.o \

       getc.o putc.o __putc.o __getc.o \

-      ferror.o feof.o clearerr.o \

+      rewind.o fseek.o ferror.o feof.o clearerr.o \

       realloc.o calloc.o malloc.o \

       assert.o strcpy.o strcmp.o strlen.o strchr.o \

       strrchr.o strcat.o strncmp.o strncpy.o strncat.o strcoll.o \

--- /dev/null

+++ b/lib/c/src/fseek.c

@@ -1,0 +1,27 @@

+

+#include <stdio.h>

+#include "syscall.h"

+#undef fseek

+

+int

+fseek(FILE *fp, long off, int whence)

+{

+	if (fp->flags & _IOERR)

+		return EOF;

+

+	if ((fp->flags & _IOWRITE) && fflush(fp))

+		return -1;

+	else if (whence == SEEK_CUR && (fp->flags & _IOREAD))

+		off -= fp->wp - fp->rd;

+

+	if (_seek(fp->fd, off, type) < 0) {

+		fp->flags |= _IOERR;

+		return EOF;

+	}

+

+	if (fp->flags & _IORW)

+		fp->flags &= ~(_IOREAD | _IOWRITE);

+	fp->flags &= ~_IOEOF;

+

+	return 0;

+}

--- /dev/null

+++ b/lib/c/src/rewind.c

@@ -1,0 +1,11 @@

+

+#include <stdio.h>

+#undef rewind

+

+void

+rewind(FILE *fp)

+{

+	fp->flags &= ~_IOERR;

+	fseek(fp, 0, SEEK_SET);

+	clearerr(fp);

+}