ex/ex_append.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_append.c,v 10.32 2000/07/14 14:29:19 skimo Exp $ (Berkeley) $Date: 2000/07/14 14:29:19 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18
  19 #include <bitstring.h>
  20 #include <limits.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25 #include "../common/common.h"
  26
  27 enum which {APPEND, CHANGE, INSERT};
  28
  29 static int ex_aci __P((SCR *, EXCMD *, enum which));
  30
  31 /*
  32  * ex_append -- :[line] a[ppend][!]
  33  *      Append one or more lines of new text after the specified line,
  34  *      or the current line if no address is specified.
  35  *
  36  * PUBLIC: int ex_append __P((SCR *, EXCMD *));
  37  */
  38 int
  39 ex_append(sp, cmdp)
  40         SCR *sp;
  41         EXCMD *cmdp;
  42 {
  43         return (ex_aci(sp, cmdp, APPEND));
  44 }
  45
  46 /*
  47  * ex_change -- :[line[,line]] c[hange][!] [count]
  48  *      Change one or more lines to the input text.
  49  *
  50  * PUBLIC: int ex_change __P((SCR *, EXCMD *));
  51  */
  52 int
  53 ex_change(sp, cmdp)
  54         SCR *sp;
  55         EXCMD *cmdp;
  56 {
  57         return (ex_aci(sp, cmdp, CHANGE));
  58 }
  59
  60 /*
  61  * ex_insert -- :[line] i[nsert][!]
  62  *      Insert one or more lines of new text before the specified line,
  63  *      or the current line if no address is specified.
  64  *
  65  * PUBLIC: int ex_insert __P((SCR *, EXCMD *));
  66  */
  67 int
  68 ex_insert(sp, cmdp)
  69         SCR *sp;
  70         EXCMD *cmdp;
  71 {
  72         return (ex_aci(sp, cmdp, INSERT));
  73 }
  74
  75 /*
  76  * ex_aci --
  77  *      Append, change, insert in ex.
  78  */
  79 static int
  80 ex_aci(sp, cmdp, cmd)
  81         SCR *sp;
  82         EXCMD *cmdp;
  83         enum which cmd;
  84 {
  85         CHAR_T *p, *t;
  86         GS *gp;
  87         TEXT *tp;
  88         TEXTH tiq;
  89         db_recno_t cnt, lno;
  90         size_t len;
  91         u_int32_t flags;
  92         int need_newline;
  93
  94         gp = sp->gp;
  95         NEEDFILE(sp, cmdp);
  96
  97         /*
  98          * If doing a change, replace lines for as long as possible.  Then,
  99          * append more lines or delete remaining lines.  Changes to an empty
 100          * file are appends, inserts are the same as appends to the previous
 101          * line.
 102          *
 103          * !!!
 104          * Set the address to which we'll append.  We set sp->lno to this
 105          * address as well so that autoindent works correctly when get text
 106          * from the user.
 107          */
 108         lno = cmdp->addr1.lno;
 109         sp->lno = lno;
 110         if ((cmd == CHANGE || cmd == INSERT) && lno != 0)
 111                 --lno;
 112
 113         /*
 114          * !!!
 115          * If the file isn't empty, cut changes into the unnamed buffer.
 116          */
 117         if (cmd == CHANGE && cmdp->addr1.lno != 0 &&
 118             (cut(sp, NULL, &cmdp->addr1, &cmdp->addr2, CUT_LINEMODE) ||
 119             del(sp, &cmdp->addr1, &cmdp->addr2, 1)))
 120                 return (1);
 121
 122         /*
 123          * !!!
 124          * Anything that was left after the command separator becomes part
 125          * of the inserted text.  Apparently, it was common usage to enter:
 126          *
 127          *      :g/pattern/append|stuff1
 128          *
 129          * and append the line of text "stuff1" to the lines containing the
 130          * pattern.  It was also historically legal to enter:
 131          *
 132          *      :append|stuff1
 133          *      stuff2
 134          *      .
 135          *
 136          * and the text on the ex command line would be appended as well as
 137          * the text inserted after it.  There was an historic bug however,
 138          * that the user had to enter *two* terminating lines (the '.' lines)
 139          * to terminate text input mode, in this case.  This whole thing
 140          * could be taken too far, however.  Entering:
 141          *
 142          *      :append|stuff1\
 143          *      stuff2
 144          *      stuff3
 145          *      .
 146          *
 147          * i.e. mixing and matching the forms confused the historic vi, and,
 148          * not only did it take two terminating lines to terminate text input
 149          * mode, but the trailing backslashes were retained on the input.  We
 150          * match historic practice except that we discard the backslashes.
 151          *
 152          * Input lines specified on the ex command line lines are separated by
 153          * <newline>s.  If there is a trailing delimiter an empty line was
 154          * inserted.  There may also be a leading delimiter, which is ignored
 155          * unless it's also a trailing delimiter.  It is possible to encounter
 156          * a termination line, i.e. a single '.', in a global command, but not
 157          * necessary if the text insert command was the last of the global
 158          * commands.
 159          */
 160         if (cmdp->save_cmdlen != 0) {
 161                 for (p = cmdp->save_cmd,
 162                     len = cmdp->save_cmdlen; len > 0; p = t) {
 163                         for (t = p; len > 0 && t[0] != '\n'; ++t, --len);
 164                         if (t != p || len == 0) {
 165                                 if (F_ISSET(sp, SC_EX_GLOBAL) &&
 166                                     t - p == 1 && p[0] == '.') {
 167                                         ++t;
 168                                         if (len > 0)
 169                                                 --len;
 170                                         break;
 171                                 }
 172                                 if (db_append(sp, 1, lno++, p, t - p))
 173                                         return (1);
 174                         }
 175                         if (len != 0) {
 176                                 ++t;
 177                                 if (--len == 0 &&
 178                                     db_append(sp, 1, lno++, NULL, 0))
 179                                         return (1);
 180                         }
 181                 }
 182                 /*
 183                  * If there's any remaining text, we're in a global, and
 184                  * there's more command to parse.
 185                  *
 186                  * !!!
 187                  * We depend on the fact that non-global commands will eat the
 188                  * rest of the command line as text input, and before getting
 189                  * any text input from the user.  Otherwise, we'd have to save
 190                  * off the command text before or during the call to the text
 191                  * input function below.
 192                  */
 193                 if (len != 0)
 194                         cmdp->save_cmd = t;
 195                 cmdp->save_cmdlen = len;
 196         }
 197
 198         if (F_ISSET(sp, SC_EX_GLOBAL)) {
 199                 if ((sp->lno = lno) == 0 && db_exist(sp, 1))
 200                         sp->lno = 1;
 201                 return (0);
 202         }
 203
 204         /*
 205          * If not in a global command, read from the terminal.
 206          *
 207          * If this code is called by vi, we want to reset the terminal and use
 208          * ex's line get routine.  It actually works fine if we use vi's get
 209          * routine, but it doesn't look as nice.  Maybe if we had a separate
 210          * window or something, but getting a line at a time looks awkward.
 211          * However, depending on the screen that we're using, that may not
 212          * be possible.
 213          */
 214         if (F_ISSET(sp, SC_VI)) {
 215                 if (gp->scr_screen(sp, SC_EX)) {
 216                         ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON);
 217                         return (1);
 218                 }
 219
 220                 /* If we're still in the vi screen, move out explicitly. */
 221                 need_newline = !F_ISSET(sp, SC_SCR_EXWROTE);
 222                 F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
 223                 if (need_newline)
 224                         (void)ex_puts(sp, "\n");
 225
 226                 /*
 227                  * !!!
 228                  * Users of historical versions of vi sometimes get confused
 229                  * when they enter append mode, and can't seem to get out of
 230                  * it.  Give them an informational message.
 231                  */
 232                 (void)ex_puts(sp,
 233                     msg_cat(sp, "273|Entering ex input mode.", NULL));
 234                 (void)ex_puts(sp, "\n");
 235                 (void)ex_fflush(sp);
 236         }
 237
 238         /*
 239          * Set input flags; the ! flag turns off autoindent for append,
 240          * change and insert.
 241          */
 242         LF_INIT(TXT_DOTTERM | TXT_NUMBER);
 243         if (!FL_ISSET(cmdp->iflags, E_C_FORCE) && O_ISSET(sp, O_AUTOINDENT))
 244                 LF_SET(TXT_AUTOINDENT);
 245         if (O_ISSET(sp, O_BEAUTIFY))
 246                 LF_SET(TXT_BEAUTIFY);
 247
 248         /*
 249          * This code can't use the common screen TEXTH structure (sp->tiq),
 250          * as it may already be in use, e.g. ":append|s/abc/ABC/" would fail
 251          * as we are only halfway through the text when the append code fires.
 252          * Use a local structure instead.  (The ex code would have to use a
 253          * local structure except that we're guaranteed to finish remaining
 254          * characters in the common TEXTH structure when they were inserted
 255          * into the file, above.)
 256          */
 257         memset(&tiq, 0, sizeof(TEXTH));
 258         CIRCLEQ_INIT(&tiq);
 259
 260         if (ex_txt(sp, &tiq, 0, flags))
 261                 return (1);
 262
 263         for (cnt = 0, tp = tiq.cqh_first;
 264             tp != (TEXT *)&tiq; ++cnt, tp = tp->q.cqe_next)
 265                 if (db_append(sp, 1, lno++, tp->lb, tp->len))
 266                         return (1);
 267
 268         /*
 269          * Set sp->lno to the final line number value (correcting for a
 270          * possible 0 value) as that's historically correct for the final
 271          * line value, whether or not the user entered any text.
 272          */
 273         if ((sp->lno = lno) == 0 && db_exist(sp, 1))
 274                 sp->lno = 1;
 275
 276         return (0);
 277 }