ex/ex_at.c

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