/*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char sccsid[] = "@(#)getc.c 8.1 (Berkeley) 6/9/93"; #endif /* not lint */ #include <sys/types.h> #include "vi.h" #include "vcmd.h" #define GB ep->getc_bp #define GL ep->getc_blen #define GM ep->getc_m /* * getc_init -- * Initialize getc routines. */ int getc_init(sp, ep, fm, chp) SCR *sp; EXF *ep; MARK *fm; int *chp; { recno_t lno; GM = *fm; if ((GB = file_gline(sp, ep, fm->lno, &GL)) == NULL) { if (file_lline(sp, ep, &lno)) return (1); if (lno == 0) v_eol(sp, ep, NULL); else GETLINE_ERR(sp, fm->lno); return (1); } *chp = GL == 0 ? EMPTYLINE : GB[GM.cno]; return (0); } /* * getc_next -- * Retrieve the next character. */ int getc_next(sp, ep, dir, chp) SCR *sp; EXF *ep; enum direction dir; int *chp; { MARK save; save = GM; switch (dir) { case FORWARD: if (GL == 0 || GM.cno == GL - 1) { GM.cno = 0; /* EOF; restore the cursor. */ if ((GB = file_gline(sp, ep, ++GM.lno, &GL)) == NULL) { GM = save; return (0); } if (GL == 0) { *chp = EMPTYLINE; return (1); } } else ++GM.cno; break; case BACKWARD: if (GM.cno == 0) { /* EOF; restore the cursor. */ if ((GB = file_gline(sp, ep, --GM.lno, &GL)) == NULL) { GM = save; return (0); } if (GL == 0) { *chp = EMPTYLINE; return (1); } GM.cno = GL - 1; } else --GM.cno; break; default: abort(); } *chp = GB[GM.cno]; return (1); } /* * getc_set -- * Return the last cursor position. */ void getc_set(sp, ep, rp) SCR *sp; EXF *ep; MARK *rp; { *rp = GM; }