Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/libstdio/ftell.c

Copyright © 2009 Alcatel-Lucent.
Distributed under the Lucent Public License version 1.02.
Download the Plan 9 distribution.


/*
 * pANS stdio -- ftell
 */
#include "iolib.h"
long ftell(FILE *f){
	long seekp=seek(f->fd, 0L, 1);
	if(seekp<0) return -1;		/* enter error state? */
	switch(f->state){
	default:
		return seekp;
	case RD:
		return seekp-(f->wp-f->rp);
	case WR:
		return (f->flags&LINEBUF?f->lp:f->wp)-f->buf+seekp;
	}
}

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