13e12c5d1SDavid du Colombier /* 23e12c5d1SDavid du Colombier * pANS stdio -- _IO_getc 33e12c5d1SDavid du Colombier */ 43e12c5d1SDavid du Colombier #include "iolib.h" _IO_getc(FILE * f)53e12c5d1SDavid du Colombierint _IO_getc(FILE *f){ 6*d9306527SDavid du Colombier int cnt, n; 73e12c5d1SDavid du Colombier switch(f->state){ 83e12c5d1SDavid du Colombier default: /* CLOSED, WR, ERR, EOF */ 93e12c5d1SDavid du Colombier return EOF; 103e12c5d1SDavid du Colombier case OPEN: 113e12c5d1SDavid du Colombier _IO_setvbuf(f); 123e12c5d1SDavid du Colombier case RDWR: 133e12c5d1SDavid du Colombier case RD: 143e12c5d1SDavid du Colombier if(f->flags&STRING) return EOF; 15*d9306527SDavid du Colombier if(f->buf == f->unbuf) 16*d9306527SDavid du Colombier n = 1; 17*d9306527SDavid du Colombier else 18*d9306527SDavid du Colombier n = f->bufl; 19*d9306527SDavid du Colombier cnt=read(f->fd, f->buf, n); 203e12c5d1SDavid du Colombier switch(cnt){ 213e12c5d1SDavid du Colombier case -1: f->state=ERR; return EOF; 223e12c5d1SDavid du Colombier case 0: f->state=END; return EOF; 233e12c5d1SDavid du Colombier default: 243e12c5d1SDavid du Colombier f->state=RD; 253e12c5d1SDavid du Colombier f->rp=f->buf; 263e12c5d1SDavid du Colombier f->wp=f->buf+cnt; 273e12c5d1SDavid du Colombier return (*f->rp++)&_IO_CHMASK; 283e12c5d1SDavid du Colombier } 293e12c5d1SDavid du Colombier } 303e12c5d1SDavid du Colombier } 31