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[lib/c] Add feof(), ferror() and clearerr()

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

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

@@ -8,6 +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 \

       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/clearerr.c

@@ -1,0 +1,9 @@

+

+#include <stdio.h>

+#undef clearerr

+

+void

+clearerr(FILE *fp)

+{

+	fp->flags &= ~(_IOERR | _IOEOF);

+}

--- /dev/null

+++ b/lib/c/src/feof.c

@@ -1,0 +1,9 @@

+

+#include <stdio.h>

+#undef feof

+

+int

+feof(FILE *fp)

+{

+	return fp->flags & _IOEOF;

+}

--- /dev/null

+++ b/lib/c/src/ferror.c

@@ -1,0 +1,9 @@

+

+#include <stdio.h>

+#undef ferror

+

+int

+ferror(FILE *fp)

+{

+	return fp->flags & _IOERR;

+}