common/cut.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: cut.c,v 10.17 2000/07/22 17:31:18 skimo Exp $ (Berkeley) $Date: 2000/07/22 17:31:18 $";
  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 <errno.h>
  22 #include <fcntl.h>
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "common.h"
  29
  30 static void     cb_rotate __P((SCR *));
  31
  32 /*
  33  * cut --
  34  *      Put a range of lines/columns into a TEXT buffer.
  35  *
  36  * There are two buffer areas, both found in the global structure.  The first
  37  * is the linked list of all the buffers the user has named, the second is the
  38  * unnamed buffer storage.  There is a pointer, too, which is the current
  39  * default buffer, i.e. it may point to the unnamed buffer or a named buffer
  40  * depending on into what buffer the last text was cut.  Logically, in both
  41  * delete and yank operations, if the user names a buffer, the text is cut
  42  * into it.  If it's a delete of information on more than a single line, the
  43  * contents of the numbered buffers are rotated up one, the contents of the
  44  * buffer named '9' are discarded, and the text is cut into the buffer named
  45  * '1'.  The text is always cut into the unnamed buffer.
  46  *
  47  * In all cases, upper-case buffer names are the same as lower-case names,
  48  * with the exception that they cause the buffer to be appended to instead
  49  * of replaced.  Note, however, that if text is appended to a buffer, the
  50  * default buffer only contains the appended text, not the entire contents
  51  * of the buffer.
  52  *
  53  * !!!
  54  * The contents of the default buffer would disappear after most operations
  55  * in historic vi.  It's unclear that this is useful, so we don't bother.
  56  *
  57  * When users explicitly cut text into the numeric buffers, historic vi became
  58  * genuinely strange.  I've never been able to figure out what was supposed to
  59  * happen.  It behaved differently if you deleted text than if you yanked text,
  60  * and, in the latter case, the text was appended to the buffer instead of
  61  * replacing the contents.  Hopefully it's not worth getting right, and here
  62  * we just treat the numeric buffers like any other named buffer.
  63  *
  64  * PUBLIC: int cut __P((SCR *, CHAR_T *, MARK *, MARK *, int));
  65  */
  66 int
  67 cut(sp, namep, fm, tm, flags)
  68         SCR *sp;
  69         CHAR_T *namep;
  70         MARK *fm, *tm;
  71         int flags;
  72 {
  73         CB *cbp;
  74         CHAR_T name;
  75         db_recno_t lno;
  76         int append, copy_one, copy_def;
  77
  78         /*
  79          * If the user specified a buffer, put it there.  (This may require
  80          * a copy into the numeric buffers.  We do the copy so that we don't
  81          * have to reference count and so we don't have to deal with things
  82          * like appends to buffers that are used multiple times.)
  83          *
  84          * Otherwise, if it's supposed to be put in a numeric buffer (usually
  85          * a delete) put it there.  The rules for putting things in numeric
  86          * buffers were historically a little strange.  There were three cases.
  87          *
  88          *      1: Some motions are always line mode motions, which means
  89          *         that the cut always goes into the numeric buffers.
  90          *      2: Some motions aren't line mode motions, e.g. d10w, but
  91          *         can cross line boundaries.  For these commands, if the
  92          *         cut crosses a line boundary, it goes into the numeric
  93          *         buffers.  This includes most of the commands.
  94          *      3: Some motions aren't line mode motions, e.g. d`<char>,
  95          *         but always go into the numeric buffers, regardless.  This
  96          *         was the commands: % ` / ? ( ) N n { } -- and nvi adds ^A.
  97          *
  98          * Otherwise, put it in the unnamed buffer.
  99          */
 100         append = copy_one = copy_def = 0;
 101         if (namep != NULL) {
 102                 name = *namep;
 103                 if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) &&
 104                     (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) {
 105                         copy_one = 1;
 106                         cb_rotate(sp);
 107                 }
 108                 if ((append = isupper(name)) == 1) {
 109                         if (!copy_one)
 110                                 copy_def = 1;
 111                         name = tolower(name);
 112                 }
 113 namecb:         CBNAME(sp, cbp, name);
 114         } else if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) &&
 115             (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) {
 116                 name = '1';
 117                 cb_rotate(sp);
 118                 goto namecb;
 119         } else
 120                 cbp = &sp->wp->dcb_store;
 121
 122 copyloop:
 123         /*
 124          * If this is a new buffer, create it and add it into the list.
 125          * Otherwise, if it's not an append, free its current contents.
 126          */
 127         if (cbp == NULL) {
 128                 CALLOC_RET(sp, cbp, CB *, 1, sizeof(CB));
 129                 cbp->name = name;
 130                 CIRCLEQ_INIT(&cbp->textq);
 131                 LIST_INSERT_HEAD(&sp->wp->cutq, cbp, q);
 132         } else if (!append) {
 133                 text_lfree(&cbp->textq);
 134                 cbp->len = 0;
 135                 cbp->flags = 0;
 136         }
 137
 138
 139 #define ENTIRE_LINE     0
 140         /* In line mode, it's pretty easy, just cut the lines. */
 141         if (LF_ISSET(CUT_LINEMODE)) {
 142                 cbp->flags |= CB_LMODE;
 143                 for (lno = fm->lno; lno <= tm->lno; ++lno)
 144                         if (cut_line(sp, lno, 0, 0, cbp))
 145                                 goto cut_line_err;
 146         } else {
 147                 /*
 148                  * Get the first line.  A length of 0 causes cut_line
 149                  * to cut from the MARK to the end of the line.
 150                  */
 151                 if (cut_line(sp, fm->lno, fm->cno, fm->lno != tm->lno ?
 152                     ENTIRE_LINE : (tm->cno - fm->cno) + 1, cbp))
 153                         goto cut_line_err;
 154
 155                 /* Get the intermediate lines. */
 156                 for (lno = fm->lno; ++lno < tm->lno;)
 157                         if (cut_line(sp, lno, 0, ENTIRE_LINE, cbp))
 158                                 goto cut_line_err;
 159
 160                 /* Get the last line. */
 161                 if (tm->lno != fm->lno &&
 162                     cut_line(sp, lno, 0, tm->cno + 1, cbp))
 163                         goto cut_line_err;
 164         }
 165
 166         append = 0;             /* Only append to the named buffer. */
 167         sp->wp->dcbp = cbp;     /* Repoint the default buffer on each pass. */
 168
 169         if (copy_one) {         /* Copy into numeric buffer 1. */
 170                 name = '1';
 171                 CBNAME(sp, cbp, name);
 172                 copy_one = 0;
 173                 goto copyloop;
 174         }
 175         if (copy_def) {         /* Copy into the default buffer. */
 176                 cbp = &sp->wp->dcb_store;
 177                 copy_def = 0;
 178                 goto copyloop;
 179         }
 180         return (0);
 181
 182 cut_line_err:
 183         text_lfree(&cbp->textq);
 184         cbp->len = 0;
 185         cbp->flags = 0;
 186         return (1);
 187 }
 188
 189 /*
 190  * cb_rotate --
 191  *      Rotate the numbered buffers up one.
 192  */
 193 static void
 194 cb_rotate(sp)
 195         SCR *sp;
 196 {
 197         CB *cbp, *del_cbp;
 198
 199         del_cbp = NULL;
 200         for (cbp = sp->wp->cutq.lh_first; cbp != NULL; cbp = cbp->q.le_next)
 201                 switch(cbp->name) {
 202                 case '1':
 203                         cbp->name = '2';
 204                         break;
 205                 case '2':
 206                         cbp->name = '3';
 207                         break;
 208                 case '3':
 209                         cbp->name = '4';
 210                         break;
 211                 case '4':
 212                         cbp->name = '5';
 213                         break;
 214                 case '5':
 215                         cbp->name = '6';
 216                         break;
 217                 case '6':
 218                         cbp->name = '7';
 219                         break;
 220                 case '7':
 221                         cbp->name = '8';
 222                         break;
 223                 case '8':
 224                         cbp->name = '9';
 225                         break;
 226                 case '9':
 227                         del_cbp = cbp;
 228                         break;
 229                 }
 230         if (del_cbp != NULL) {
 231                 LIST_REMOVE(del_cbp, q);
 232                 text_lfree(&del_cbp->textq);
 233                 free(del_cbp);
 234         }
 235 }
 236
 237 /*
 238  * cut_line --
 239  *      Cut a portion of a single line.
 240  *
 241  * PUBLIC: int cut_line __P((SCR *, db_recno_t, size_t, size_t, CB *));
 242  */
 243 int
 244 cut_line(sp, lno, fcno, clen, cbp)
 245         SCR *sp;
 246         db_recno_t lno;
 247         size_t fcno, clen;
 248         CB *cbp;
 249 {
 250         TEXT *tp;
 251         size_t len;
 252         CHAR_T *p;
 253
 254         /* Get the line. */
 255         if (db_get(sp, lno, DBG_FATAL, &p, &len))
 256                 return (1);
 257
 258         /* Create a TEXT structure that can hold the entire line. */
 259         if ((tp = text_init(sp, NULL, 0, len)) == NULL)
 260                 return (1);
 261
 262         /*
 263          * If the line isn't empty and it's not the entire line,
 264          * copy the portion we want, and reset the TEXT length.
 265          */
 266         if (len != 0) {
 267                 if (clen == 0)
 268                         clen = len - fcno;
 269                 MEMCPYW(tp->lb, p + fcno, clen);
 270                 tp->len = clen;
 271         }
 272
 273         /* Append to the end of the cut buffer. */
 274         CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q);
 275         cbp->len += tp->len;
 276
 277         return (0);
 278 }
 279
 280 /*
 281  * cut_close --
 282  *      Discard all cut buffers.
 283  *
 284  * PUBLIC: void cut_close __P((WIN *));
 285  */
 286 void
 287 cut_close(wp)
 288         WIN *wp;
 289 {
 290         CB *cbp;
 291
 292         /* Free cut buffer list. */
 293         while ((cbp = wp->cutq.lh_first) != NULL) {
 294                 if (cbp->textq.cqh_first != (void *)&cbp->textq)
 295                         text_lfree(&cbp->textq);
 296                 LIST_REMOVE(cbp, q);
 297                 free(cbp);
 298         }
 299
 300         /* Free default cut storage. */
 301         cbp = &wp->dcb_store;
 302         if (cbp->textq.cqh_first != (void *)&cbp->textq)
 303                 text_lfree(&cbp->textq);
 304 }
 305
 306 /*
 307  * text_init --
 308  *      Allocate a new TEXT structure.
 309  *
 310  * PUBLIC: TEXT *text_init __P((SCR *, const CHAR_T *, size_t, size_t));
 311  */
 312 TEXT *
 313 text_init(sp, p, len, total_len)
 314         SCR *sp;
 315         const CHAR_T *p;
 316         size_t len, total_len;
 317 {
 318         TEXT *tp;
 319
 320         CALLOC(sp, tp, TEXT *, 1, sizeof(TEXT));
 321         if (tp == NULL)
 322                 return (NULL);
 323         /* ANSI C doesn't define a call to malloc(3) for 0 bytes. */
 324         if ((tp->lb_len = total_len * sizeof(CHAR_T)) != 0) {
 325                 MALLOC(sp, tp->lb, CHAR_T *, tp->lb_len * sizeof(CHAR_T));
 326                 if (tp->lb == NULL) {
 327                         free(tp);
 328                         return (NULL);
 329                 }
 330                 if (p != NULL && len != 0)
 331                         MEMCPYW(tp->lb, p, len);
 332         }
 333         tp->len = len;
 334         return (tp);
 335 }
 336
 337 /*
 338  * text_lfree --
 339  *      Free a chain of text structures.
 340  *
 341  * PUBLIC: void text_lfree __P((TEXTH *));
 342  */
 343 void
 344 text_lfree(headp)
 345         TEXTH *headp;
 346 {
 347         TEXT *tp;
 348
 349         while ((tp = headp->cqh_first) != (void *)headp) {
 350                 CIRCLEQ_REMOVE(headp, tp, q);
 351                 text_free(tp);
 352         }
 353 }
 354
 355 /*
 356  * text_free --
 357  *      Free a text structure.
 358  *
 359  * PUBLIC: void text_free __P((TEXT *));
 360  */
 361 void
 362 text_free(tp)
 363         TEXT *tp;
 364 {
 365         if (tp->lb != NULL)
 366                 free(tp->lb);
 367         free(tp);
 368 }