1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)UNSYNC.c 1.3 06/10/81"; 4 5 #include "h00vars.h" 6 7 /* 8 * push back last char read to prepare for formatted read 9 */ 10 UNSYNC(curfile) 11 12 register struct iorec *curfile; 13 { 14 if (curfile->funit & FWRITE) { 15 ERROR("%s: Attempt to read, but open for writing\n", 16 curfile->pfname); 17 return; 18 } 19 if (curfile->funit & EOFF) { 20 ERROR("%s: Tried to read past end of file\n", curfile->pfname); 21 return; 22 } 23 if ((curfile->funit & SYNC) == 0) { 24 ungetc(*curfile->fileptr, curfile->fbuf); 25 } 26 } 27