external/bsd/nvi/dist/ex/ex_at.c

   1 /*      $NetBSD: ex_at.c,v 1.4 2013/11/27 21:13:16 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #ifndef lint
  14 static const char sccsid[] = "Id: ex_at.c,v 10.16 2001/06/25 15:19:14 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:14 ";
  15 #endif /* not lint */
  16
  17 #include <sys/types.h>
  18 #include <sys/queue.h>
  19
  20 #include <bitstring.h>
  21 #include <ctype.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "../common/common.h"
  28
  29 /*
  30  * ex_at -- :@[@ | buffer]
  31  *          :*[* | buffer]
  32  *
  33  *      Execute the contents of the buffer.
  34  *
  35  * PUBLIC: int ex_at __P((SCR *, EXCMD *));
  36  */
  37 int
  38 ex_at(SCR *sp, EXCMD *cmdp)
  39 {
  40         CB *cbp;
  41         ARG_CHAR_T name;
  42         EXCMD *ecp;
  43         RANGE *rp;
  44         TEXT *tp;
  45         size_t len;
  46         CHAR_T *p;
  47
  48         /*
  49          * !!!
  50          * Historically, [@*]<carriage-return> and [@*][@*] executed the most
  51          * recently executed buffer in ex mode.
  52          */
  53         name = FL_ISSET(cmdp->iflags, E_C_BUFFER) ? cmdp->buffer : '@';
  54         if (name == '@' || name == '*') {
  55                 if (!F_ISSET(sp, SC_AT_SET)) {
  56                         ex_emsg(sp, NULL, EXM_NOPREVBUF);
  57                         return (1);
  58                 }
  59                 name = sp->at_lbuf;
  60         }
  61         sp->at_lbuf = name;
  62         F_SET(sp, SC_AT_SET);
  63
  64         CBNAME(sp, cbp, name);
  65         if (cbp == NULL) {
  66                 ex_emsg(sp, (char *)KEY_NAME(sp, name), EXM_EMPTYBUF);
  67                 return (1);
  68         }
  69
  70         /*
  71          * !!!
  72          * Historically the @ command took a range of lines, and the @ buffer
  73          * was executed once per line.  The historic vi could be trashed by
  74          * this because it didn't notice if the underlying file changed, or,
  75          * for that matter, if there were no more lines on which to operate.
  76          * For example, take a 10 line file, load "%delete" into a buffer,
  77          * and enter :8,10@<buffer>.
  78          *
  79          * The solution is a bit tricky.  If the user specifies a range, take
  80          * the same approach as for global commands, and discard the command
  81          * if exit or switch to a new file/screen.  If the user doesn't specify
  82          * the  range, continue to execute after a file/screen switch, which
  83          * means @ buffers are still useful in a multi-screen environment.
  84          */
  85         CALLOC_RET(sp, ecp, EXCMD *, 1, sizeof(EXCMD));
  86         TAILQ_INIT(&ecp->rq);
  87         CALLOC_RET(sp, rp, RANGE *, 1, sizeof(RANGE));
  88         rp->start = cmdp->addr1.lno;
  89         if (F_ISSET(cmdp, E_ADDR_DEF)) {
  90                 rp->stop = rp->start;
  91                 FL_SET(ecp->agv_flags, AGV_AT_NORANGE);
  92         } else {
  93                 rp->stop = cmdp->addr2.lno;
  94                 FL_SET(ecp->agv_flags, AGV_AT);
  95         }
  96         TAILQ_INSERT_HEAD(&ecp->rq, rp, q);
  97
  98         /*
  99          * Buffers executed in ex mode or from the colon command line in vi
 100          * were ex commands.  We can't push it on the terminal queue, since
 101          * it has to be executed immediately, and we may be in the middle of
 102          * an ex command already.  Push the command on the ex command stack.
 103          * Build two copies of the command.  We need two copies because the
 104          * ex parser may step on the command string when it's parsing it.
 105          */
 106         for (len = 0, tp = TAILQ_LAST(&cbp->textq, _texth);
 107             tp != NULL; tp = TAILQ_PREV(tp, _texth, q))
 108                 len += tp->len + 1;
 109
 110         MALLOC_GOTO(sp, ecp->cp, CHAR_T *, len * 2 * sizeof(CHAR_T));
 111         ecp->o_cp = ecp->cp;
 112         ecp->o_clen = len;
 113         ecp->cp[len] = '\0';
 114
 115         /* Copy the buffer into the command space. */
 116         for (p = ecp->cp + len, tp = TAILQ_LAST(&cbp->textq, _texth);
 117             tp != NULL; tp = TAILQ_PREV(tp, _texth, q)) {
 118                 MEMCPYW(p, tp->lb, tp->len);
 119                 p += tp->len;
 120                 *p++ = '\n';
 121         }
 122
 123         LIST_INSERT_HEAD(&sp->wp->ecq, ecp, q);
 124         return (0);
 125 alloc_err:
 126         free(ecp);
 127         return 1;
 128 }