492 lines
9.3 KiB
C
492 lines
9.3 KiB
C
/* cut.c */
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/* Author:
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* Steve Kirkendall
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* 16820 SW Tallac Way
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* Beaverton, OR 97006
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* kirkenda@jove.cs.pdx.edu, or ...uunet!tektronix!psueea!jove!kirkenda
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*/
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/* This file contains function which manipulate the cut buffers. */
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#include "vi.h"
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extern char *malloc();
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# define NANNONS 9 /* number of annonymous buffers */
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static struct cutbuf
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{
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short *phys; /* pointer to an array of #s of BLKs containing text */
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int nblks; /* number of blocks in phys[] array */
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int start; /* offset into first block of start of cut */
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int end; /* offset into last block of end of cut */
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int fd; /* fd of tmp file, or -1 to use tmpfd */
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char lnmode; /* boolean: line-mode cut? (as opposed to char-mode) */
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}
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named[27], /* cut buffers "a through "z and ". */
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annon[NANNONS]; /* annonymous cut buffers */
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static char cbname; /* name chosen for next cut/paste operation */
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#ifndef NO_RECYCLE
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/* This function builds a list of all blocks needed in the current tmp file
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* for the contents of cut buffers.
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* !!! WARNING: if you have more than ~450000 bytes of text in all of the
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* cut buffers, then this will fail disastrously, because buffer overflow
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* is *not* allowed for.
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*/
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int cutneeds(need)
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BLK *need; /* this is where we deposit the list */
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{
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struct cutbuf *cb; /* used to count through cut buffers */
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int i; /* used to count through blocks of a cut buffer */
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int n; /* total number of blocks in list */
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n = 0;
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/* first the named buffers... */
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for (cb = named; cb < &named[27]; cb++)
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{
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if (cb->fd > 0)
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continue;
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for (i = cb->nblks; i-- > 0; )
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{
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need->n[n++] = cb->phys[i];
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}
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}
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/* then the anonymous buffers */
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for (cb = annon; cb < &annon[NANNONS]; cb++)
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{
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if (cb->fd > 0)
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continue;
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for (i = cb->nblks; i-- > 0; )
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{
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need->n[n++] = cb->phys[i];
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}
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}
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return n;
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}
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#endif
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/* This function is called when we are about to abort a tmp file. If any
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* cut buffers still need the file, then a copy of the file should be
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* created for use by the cut buffers.
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*
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* To minimize the number of extra files lying around, only named cut buffers
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* are preserved in a file switch; the annonymous buffers just go away.
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*/
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cutswitch(tmpname)
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char *tmpname; /* name of the tmp file */
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{
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char cutname[50]; /* used to build a new name for the tmp file */
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int fd; /* a new fd for the current tmp file */
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int i;
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/* discard all annonymous cut buffers */
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for (i = 0; i < NANNONS; i++)
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{
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cutfree(&annon[i]);
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}
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/* find the first named buffer that uses this tmp file */
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for (i = 0; i < 27; i++)
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{
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if (named[i].nblks > 0 && named[i].fd < 0)
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{
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break;
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}
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}
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/* if none of them use this tmp file, then we're done */
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if (i == 27)
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{
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return;
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}
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/* else we'll need this file and an fd a little longer */
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/* !!! we could use some error checking here */
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fd = dup(tmpfd);
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sprintf(cutname, CUTNAME, getpid(), fd);
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link(tmpname, cutname);
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/* have all cut buffers use the new fd instead */
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for (; i < 27; i++)
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{
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if (named[i].nblks > 0 && named[i].fd < 0)
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{
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named[i].fd = fd;
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}
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}
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}
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/* This function frees a cut buffer */
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static cutfree(buf)
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struct cutbuf *buf;
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{
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char cutname[50];
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int i;
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/* return immediately if the buffer is already empty */
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if (buf->nblks <= 0)
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{
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return;
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}
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/* else free up stuff */
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buf->nblks = 0;
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free(buf->phys);
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/* see if anybody else needs this tmp file */
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if (buf->fd >= 0)
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{
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for (i = 0; i < 27; i++)
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{
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if (named[i].nblks > 0 && named[i].fd >= 0)
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{
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break;
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}
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}
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}
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/* if nobody else needs it, then discard the tmp file */
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if (buf->fd >= 0 && i == 27)
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{
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sprintf(cutname, CUTNAME, getpid(), buf->fd);
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unlink(cutname);
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close(buf->fd);
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}
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}
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/* This function should be called just before termination of vi */
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cutend()
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{
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int i;
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/* free all named cut buffers, since they might be forcing an older
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* tmp file to be retained.
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*/
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for (i = 0; i < 27; i++)
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{
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cutfree(&named[i]);
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}
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}
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/* This function is used to select the cut buffer to be used next */
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cutname(name)
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int name; /* a single character */
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{
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cbname = name;
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}
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/* This function copies a selected segment of text to a cut buffer */
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cut(from, to)
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MARK from; /* start of text to cut */
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MARK to; /* end of text to cut */
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{
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int first; /* logical number of first block in cut */
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int last; /* logical number of last block used in cut */
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long line; /* a line number */
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register struct cutbuf *cb;
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register long l;
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register int i;
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register char *scan;
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char *blkc;
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/* decide which cut buffer to use */
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if (!cbname)
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{
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/* free up the last annonymous cut buffer */
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cutfree(&annon[NANNONS - 1]);
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/* shift the annonymous cut buffers */
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for (i = NANNONS - 1; i > 0; i--)
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{
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annon[i] = annon[i - 1];
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}
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/* use the first annonymous cut buffer */
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cb = annon;
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cb->nblks = 0;
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}
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else if (cbname >= 'a' && cbname <= 'z')
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{
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cb = &named[cbname - 'a'];
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cutfree(cb);
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}
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else if (cbname == '.')
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{
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cb = &named[26];
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cutfree(cb);
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}
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else
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{
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msg("Invalid cut buffer name: \"%c", cbname);
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cbname = '\0';
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return;
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}
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cbname = '\0';
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cb->fd = -1;
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/* detect whether we're doing a line mode cut */
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cb->lnmode = (markidx(from) == 0 && markidx(to) == 0);
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/* ---------- */
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/* Reporting... */
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if (markidx(from) == 0 && markidx(to) == 0)
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{
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rptlines = markline(to) - markline(from);
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rptlabel = "yanked";
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}
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/* ---------- */
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blksync();
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/* find the first block in the cut */
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line = markline(from);
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for (first = 1; line > lnum[first]; first++)
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{
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}
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/* fetch text of the block containing that line */
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blkc = scan = blkget(first)->c;
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/* find the mark in the block */
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for (l = lnum[first - 1]; ++l < line; )
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{
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while (*scan++ != '\n')
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{
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}
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}
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scan += markidx(from);
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/* remember the offset of the start */
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cb->start = scan - blkc;
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/* ---------- */
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/* find the last block in the cut */
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line = markline(to);
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for (last = first; line > lnum[last]; last++)
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{
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}
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/* fetch text of the block containing that line */
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if (last != first)
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{
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blkc = scan = blkget(last)->c;
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}
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else
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{
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scan = blkc;
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}
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/* find the mark in the block */
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for (l = lnum[last - 1]; ++l < line; )
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{
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while (*scan++ != '\n')
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{
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}
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}
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if (markline(to) <= nlines)
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{
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scan += markidx(to);
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}
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/* remember the offset of the end */
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cb->end = scan - blkc;
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/* ------- */
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/* remember the physical block numbers of all included blocks */
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cb->nblks = last - first;
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if (cb->end > 0)
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{
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cb->nblks++;
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}
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cb->phys = (short *)malloc((unsigned)(cb->nblks * sizeof(short)));
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for (i = 0; i < cb->nblks; i++)
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{
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cb->phys[i] = hdr.n[first++];
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}
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}
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static readcutblk(cb, blkno)
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struct cutbuf *cb;
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int blkno;
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{
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int fd; /* either tmpfd or cb->fd */
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/* decide which fd to use */
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if (cb->fd >= 0)
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{
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fd = cb->fd;
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}
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else
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{
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fd = tmpfd;
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}
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/* get the block */
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lseek(fd, (long)cb->phys[blkno] * (long)BLKSIZE, 0);
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if (read(fd, tmpblk.c, BLKSIZE) != BLKSIZE)
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{
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msg("Error reading back from tmp file for pasting!");
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}
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}
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/* This function inserts text from a cut buffer, and returns the MARK where
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* insertion ended. Return MARK_UNSET on errors.
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*/
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MARK paste(at, after, retend)
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MARK at; /* where to insert the text */
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int after; /* boolean: insert after mark? (rather than before) */
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int retend; /* boolean: return end marker (rather than start) */
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{
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register struct cutbuf *cb;
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register int i;
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/* decide which cut buffer to use */
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if (cbname >= 'a' && cbname <= 'z')
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{
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cb = &named[cbname - 'a'];
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}
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else if (cbname >= '1' && cbname <= '9')
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{
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cb = &annon[cbname - '1'];
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}
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else if (cbname == '.')
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{
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cb = &named[26];
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}
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else if (!cbname)
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{
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cb = annon;
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}
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else
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{
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msg("Invalid cut buffer name: \"%c", cbname);
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return MARK_UNSET;
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}
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/* make sure it isn't empty */
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if (cb->nblks == 0)
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{
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if (cbname)
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msg("Cut buffer \"%c is empty", cbname);
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else
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msg("Cut buffer is empty");
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cbname = '\0';
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return MARK_UNSET;
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}
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cbname = '\0';
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/* adjust the insertion MARK for "after" and line-mode cuts */
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if (cb->lnmode)
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{
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at &= ~(BLKSIZE - 1);
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if (after)
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{
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at += BLKSIZE;
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}
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}
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else if (after)
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{
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/* careful! if markidx(at) == 0 we might be pasting into an
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* empty line -- so we can't blindly increment "at".
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*/
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if (markidx(at) == 0)
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{
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pfetch(markline(at));
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if (plen != 0)
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{
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at++;
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}
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}
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else
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{
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at++;
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}
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}
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/* put a copy of the "at" mark in the mark[] array, so it stays in
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* sync with changes made via add().
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*/
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mark[27] = at;
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/* simple one-block paste? */
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if (cb->nblks == 1)
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{
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/* get the block */
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readcutblk(cb, 0);
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/* isolate the text we need within it */
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if (cb->end)
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{
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tmpblk.c[cb->end] = '\0';
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}
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/* insert it */
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ChangeText
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{
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add(at, &tmpblk.c[cb->start]);
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}
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}
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else
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{
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/* multi-block paste */
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ChangeText
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{
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i = cb->nblks - 1;
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/* add text from the last block first */
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if (cb->end > 0)
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{
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readcutblk(cb, i);
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tmpblk.c[cb->end] = '\0';
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add(at, tmpblk.c);
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i--;
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}
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/* add intervening blocks */
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while (i > 0)
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{
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readcutblk(cb, i);
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add(at, tmpblk.c);
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i--;
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}
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/* add text from the first cut block */
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readcutblk(cb, 0);
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add(at, &tmpblk.c[cb->start]);
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}
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}
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/* Reporting... */
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rptlines = markline(mark[27]) - markline(at);
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rptlabel = "pasted";
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/* correct the redraw range */
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redrawafter = redrawpre = markline(at);
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redrawpost = markline(mark[27]);
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/* return the mark at the beginning of inserted text */
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if (retend)
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{
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return mark[27] - 1L;
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}
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return at;
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}
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