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

   1 /*      $NetBSD: ex_append.c,v 1.3 2013/11/25 22:43:46 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_append.c,v 10.34 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 <limits.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25
  26 #include "../common/common.h"
  27
  28 enum which {APPEND, CHANGE, INSERT};
  29
  30 static int ex_aci __P((SCR *, EXCMD *, enum which));
  31
  32 /*
  33  * ex_append -- :[line] a[ppend][!]
  34  *      Append one or more lines of new text after the specified line,
  35  *      or the current line if no address is specified.
  36  *
  37  * PUBLIC: int ex_append __P((SCR *, EXCMD *));
  38  */
  39 int
  40 ex_append(SCR *sp, EXCMD *cmdp)
  41 {
  42         return (ex_aci(sp, cmdp, APPEND));
  43 }
  44
  45 /*
  46  * ex_change -- :[line[,line]] c[hange][!] [count]
  47  *      Change one or more lines to the input text.
  48  *
  49  * PUBLIC: int ex_change __P((SCR *, EXCMD *));
  50  */
  51 int
  52 ex_change(SCR *sp, EXCMD *cmdp)
  53 {
  54         return (ex_aci(sp, cmdp, CHANGE));
  55 }
  56
  57 /*
  58  * ex_insert -- :[line] i[nsert][!]
  59  *      Insert one or more lines of new text before the specified line,
  60  *      or the current line if no address is specified.
  61  *
  62  * PUBLIC: int ex_insert __P((SCR *, EXCMD *));
  63  */
  64 int
  65 ex_insert(SCR *sp, EXCMD *cmdp)
  66 {
  67         return (ex_aci(sp, cmdp, INSERT));
  68 }
  69
  70 /*
  71  * ex_aci --
  72  *      Append, change, insert in ex.
  73  */
  74 static int
  75 ex_aci(SCR *sp, EXCMD *cmdp, enum which cmd)
  76 {
  77         CHAR_T *p, *t;
  78         GS *gp;
  79         TEXT *tp;
  80         TEXTH tiq;
  81         db_recno_t cnt, lno;
  82         size_t len;
  83         u_int32_t flags;
  84         int need_newline;
  85
  86         gp = sp->gp;
  87         NEEDFILE(sp, cmdp);
  88
  89         /*
  90          * If doing a change, replace lines for as long as possible.  Then,
  91          * append more lines or delete remaining lines.  Changes to an empty
  92          * file are appends, inserts are the same as appends to the previous
  93          * line.
  94          *
  95          * !!!
  96          * Set the address to which we'll append.  We set sp->lno to this
  97          * address as well so that autoindent works correctly when get text
  98          * from the user.
  99          */
 100         lno = cmdp->addr1.lno;
 101         sp->lno = lno;
 102         if ((cmd == CHANGE || cmd == INSERT) && lno != 0)
 103                 --lno;
 104
 105         /*
 106          * !!!
 107          * If the file isn't empty, cut changes into the unnamed buffer.
 108          */
 109         if (cmd == CHANGE && cmdp->addr1.lno != 0 &&
 110             (cut(sp, NULL, &cmdp->addr1, &cmdp->addr2, CUT_LINEMODE) ||
 111             del(sp, &cmdp->addr1, &cmdp->addr2, 1)))
 112                 return (1);
 113
 114         /*
 115          * !!!
 116          * Anything that was left after the command separator becomes part
 117          * of the inserted text.  Apparently, it was common usage to enter:
 118          *
 119          *      :g/pattern/append|stuff1
 120          *
 121          * and append the line of text "stuff1" to the lines containing the
 122          * pattern.  It was also historically legal to enter:
 123          *
 124          *      :append|stuff1
 125          *      stuff2
 126          *      .
 127          *
 128          * and the text on the ex command line would be appended as well as
 129          * the text inserted after it.  There was an historic bug however,
 130          * that the user had to enter *two* terminating lines (the '.' lines)
 131          * to terminate text input mode, in this case.  This whole thing
 132          * could be taken too far, however.  Entering:
 133          *
 134          *      :append|stuff1\
 135          *      stuff2
 136          *      stuff3
 137          *      .
 138          *
 139          * i.e. mixing and matching the forms confused the historic vi, and,
 140          * not only did it take two terminating lines to terminate text input
 141          * mode, but the trailing backslashes were retained on the input.  We
 142          * match historic practice except that we discard the backslashes.
 143          *
 144          * Input lines specified on the ex command line lines are separated by
 145          * <newline>s.  If there is a trailing delimiter an empty line was
 146          * inserted.  There may also be a leading delimiter, which is ignored
 147          * unless it's also a trailing delimiter.  It is possible to encounter
 148          * a termination line, i.e. a single '.', in a global command, but not
 149          * necessary if the text insert command was the last of the global
 150          * commands.
 151          */
 152         if (cmdp->save_cmdlen != 0) {
 153                 for (p = cmdp->save_cmd,
 154                     len = cmdp->save_cmdlen; len > 0; p = t) {
 155                         for (t = p; len > 0 && t[0] != '\n'; ++t, --len);
 156                         if (t != p || len == 0) {
 157                                 if (F_ISSET(sp, SC_EX_GLOBAL) &&
 158                                     t - p == 1 && p[0] == '.') {
 159                                         ++t;
 160                                         if (len > 0)
 161                                                 --len;
 162                                         break;
 163                                 }
 164                                 if (db_append(sp, 1, lno++, p, t - p))
 165                                         return (1);
 166                         }
 167                         if (len != 0) {
 168                                 ++t;
 169                                 if (--len == 0 &&
 170                                     db_append(sp, 1, lno++, NULL, 0))
 171                                         return (1);
 172                         }
 173                 }
 174                 /*
 175                  * If there's any remaining text, we're in a global, and
 176                  * there's more command to parse.
 177                  *
 178                  * !!!
 179                  * We depend on the fact that non-global commands will eat the
 180                  * rest of the command line as text input, and before getting
 181                  * any text input from the user.  Otherwise, we'd have to save
 182                  * off the command text before or during the call to the text
 183                  * input function below.
 184                  */
 185                 if (len != 0)
 186                         cmdp->save_cmd = t;
 187                 cmdp->save_cmdlen = len;
 188         }
 189
 190         if (F_ISSET(sp, SC_EX_GLOBAL)) {
 191                 if ((sp->lno = lno) == 0 && db_exist(sp, 1))
 192                         sp->lno = 1;
 193                 return (0);
 194         }
 195
 196         /*
 197          * If not in a global command, read from the terminal.
 198          *
 199          * If this code is called by vi, we want to reset the terminal and use
 200          * ex's line get routine.  It actually works fine if we use vi's get
 201          * routine, but it doesn't look as nice.  Maybe if we had a separate
 202          * window or something, but getting a line at a time looks awkward.
 203          * However, depending on the screen that we're using, that may not
 204          * be possible.
 205          */
 206         if (F_ISSET(sp, SC_VI)) {
 207                 if (gp->scr_screen(sp, SC_EX)) {
 208                         ex_wemsg(sp, cmdp->cmd->name, EXM_NOCANON);
 209                         return (1);
 210                 }
 211
 212                 /* If we're still in the vi screen, move out explicitly. */
 213                 need_newline = !F_ISSET(sp, SC_SCR_EXWROTE);
 214                 F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
 215                 if (need_newline)
 216                         (void)ex_puts(sp, "\n");
 217
 218                 /*
 219                  * !!!
 220                  * Users of historical versions of vi sometimes get confused
 221                  * when they enter append mode, and can't seem to get out of
 222                  * it.  Give them an informational message.
 223                  */
 224                 (void)ex_puts(sp,
 225                     msg_cat(sp, "273|Entering ex input mode.", NULL));
 226                 (void)ex_puts(sp, "\n");
 227                 (void)ex_fflush(sp);
 228         }
 229
 230         /*
 231          * Set input flags; the ! flag turns off autoindent for append,
 232          * change and insert.
 233          */
 234         LF_INIT(TXT_DOTTERM | TXT_NUMBER);
 235         if (!FL_ISSET(cmdp->iflags, E_C_FORCE) && O_ISSET(sp, O_AUTOINDENT))
 236                 LF_SET(TXT_AUTOINDENT);
 237         if (O_ISSET(sp, O_BEAUTIFY))
 238                 LF_SET(TXT_BEAUTIFY);
 239
 240         /*
 241          * This code can't use the common screen TEXTH structure (sp->tiq),
 242          * as it may already be in use, e.g. ":append|s/abc/ABC/" would fail
 243          * as we are only halfway through the text when the append code fires.
 244          * Use a local structure instead.  (The ex code would have to use a
 245          * local structure except that we're guaranteed to finish remaining
 246          * characters in the common TEXTH structure when they were inserted
 247          * into the file, above.)
 248          */
 249         memset(&tiq, 0, sizeof(TEXTH));
 250         TAILQ_INIT(&tiq);
 251
 252         if (ex_txt(sp, &tiq, 0, flags))
 253                 return (1);
 254
 255         for (cnt = 0, tp = TAILQ_FIRST(&tiq); tp != NULL;
 256             ++cnt, tp = TAILQ_NEXT(tp, q))
 257                 if (db_append(sp, 1, lno++, tp->lb, tp->len))
 258                         return (1);
 259
 260         /*
 261          * Set sp->lno to the final line number value (correcting for a
 262          * possible 0 value) as that's historically correct for the final
 263          * line value, whether or not the user entered any text.
 264          */
 265         if ((sp->lno = lno) == 0 && db_exist(sp, 1))
 266                 sp->lno = 1;
 267
 268         return (0);
 269 }