ftell.c\stdio\src - musl - musl - an implementation of the standard library for Linux-based systems

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path: root/src/stdio/ftell.c
blob: aa1f5381e9774adbc814449708465652ae990c20 (plain) (blame)
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#include "stdio_impl.h"
off_t __ftello_unlocked(FILE *f)
{
	off_t pos = f->seek(f, 0, SEEK_CUR);
	if (pos < 0) {
		FUNLOCK(f);
		return pos;
	}
	/* Adjust for data in buffer. */
	return pos - (f->rend - f->rpos) + (f->wpos - f->wbase);
}
off_t __ftello(FILE *f)
{
	off_t pos;
	FLOCK(f);
	pos = __ftello_unlocked(f);
	FUNLOCK(f);
	return pos;
}
long ftell(FILE *f)
{
	off_t pos = __ftello(f);
	if (pos > LONG_MAX) {
		errno = EOVERFLOW;
		return -1;
	}
	return pos;
}
weak_alias(__ftello, ftello);
LFS64(ftello);
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