ref: 7bcdd1b5d896816f6d403f86cd315819d0d03d07
dir: /sys/src/libstdio/ftello.c/
/* * pANS stdio -- ftello */ #include "iolib.h" long long ftello(FILE *f){ long 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; } }