projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 395c4480 AM |
1 | /*- |
| 2 | * Copyright (c) 1992, 1993, 1994 | |
| 3 | * The Regents of the University of California. All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by the University of | |
| 16 | * California, Berkeley and its contributors. | |
| 17 | * 4. Neither the name of the University nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
| 32 | */ | |
| 33 | ||
| 34 | #ifndef lint | |
| 35 | static char sccsid[] = "@(#)ex_undo.c 8.5 (Berkeley) 3/8/94"; | |
| 36 | #endif /* not lint */ | |
| 37 | ||
| 38 | #include <sys/types.h> | |
| 39 | #include <queue.h> | |
| 40 | #include <sys/time.h> | |
| 41 | ||
| 42 | #include <bitstring.h> | |
| 43 | #include <limits.h> | |
| 44 | #include <signal.h> | |
| 45 | #include <stdio.h> | |
| 46 | #include <termios.h> | |
| 47 | ||
| 48 | #include <db.h> | |
| 49 | #include <regex.h> | |
| 50 | ||
| 51 | #include "vi.h" | |
| 52 | #include "excmd.h" | |
| 53 | ||
| 54 | /* | |
| 55 | * ex_undol -- U | |
| 56 | * Undo changes to this line. | |
| 57 | */ | |
| 58 | int | |
| 59 | ex_undol(sp, ep, cmdp) | |
| 60 | SCR *sp; | |
| 61 | EXF *ep; | |
| 62 | EXCMDARG *cmdp; | |
| 63 | { | |
| 64 | if (log_setline(sp, ep)) | |
| 65 | return (1); | |
| 66 | ||
| 67 | sp->cno = 0; | |
| 68 | return (0); | |
| 69 | } | |
| 70 | ||
| 71 | /* | |
| 72 | * ex_undo -- u | |
| 73 | * Undo the last change. | |
| 74 | */ | |
| 75 | int | |
| 76 | ex_undo(sp, ep, cmdp) | |
| 77 | SCR *sp; | |
| 78 | EXF *ep; | |
| 79 | EXCMDARG *cmdp; | |
| 80 | { | |
| 81 | MARK m; | |
| 82 | ||
| 83 | /* | |
| 84 | * !!! | |
| 85 | * Multiple undo isn't available in ex, as there's no '.' command. | |
| 86 | * Whether 'u' is undo or redo is toggled each time, unless there | |
| 87 | * was a change since the last undo, in which case it's an undo. | |
| 88 | */ | |
| 89 | if (!F_ISSET(ep, F_UNDO)) { | |
| 90 | F_SET(ep, F_UNDO); | |
| 91 | ep->lundo = FORWARD; | |
| 92 | } | |
| 93 | switch (ep->lundo) { | |
| 94 | case BACKWARD: | |
| 95 | if (log_forward(sp, ep, &m)) | |
| 96 | return (1); | |
| 97 | ep->lundo = FORWARD; | |
| 98 | break; | |
| 99 | case FORWARD: | |
| 100 | if (log_backward(sp, ep, &m)) | |
| 101 | return (1); | |
| 102 | ep->lundo = BACKWARD; | |
| 103 | break; | |
| 104 | case NOTSET: | |
| 105 | abort(); | |
| 106 | } | |
| 107 | sp->lno = m.lno; | |
| 108 | sp->cno = m.cno; | |
| 109 | return (0); | |
| 110 | } |