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CICA 1995 August
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CICA - The Ultimate Collection of Shareware for Windows (Disc 2) (August 1995).iso
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source.exe
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POSIX
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ELVIS
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CUT.C
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C/C++ Source or Header
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1992-09-26
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14KB
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669 lines
/* cut.c */
/* Author:
* Steve Kirkendall
* 14407 SW Teal Blvd. #C
* Beaverton, OR 97005
* kirkenda@cs.pdx.edu
*/
/* This file contains function which manipulate the cut buffers. */
#include "config.h"
#include "vi.h"
#if TURBOC
#include <process.h> /* needed for getpid */
#endif
#if TOS
#include <osbind.h>
#define rename(a,b) Frename(0,a,b)
#endif
# define NANNONS 9 /* number of annonymous buffers */
static struct cutbuf
{
short *phys; /* pointer to an array of #s of BLKs containing text */
int nblks; /* number of blocks in phys[] array */
int start; /* offset into first block of start of cut */
int end; /* offset into last block of end of cut */
int fd; /* fd of tmp file, or -1 to use tmpfd */
char lnmode; /* boolean: line-mode cut? (as opposed to char-mode) */
}
named[27], /* cut buffers "a through "z and ". */
annon[NANNONS]; /* annonymous cut buffers */
static char cbname; /* name chosen for next cut/paste operation */
#ifndef NO_RECYCLE
/* This function builds a list of all blocks needed in the current tmp file
* for the contents of cut buffers.
* !!! WARNING: if you have more than ~450000 bytes of text in all of the
* cut buffers, then this will fail disastrously, because buffer overflow
* is *not* allowed for.
*/
int cutneeds(need)
BLK *need; /* this is where we deposit the list */
{
struct cutbuf *cb; /* used to count through cut buffers */
int i; /* used to count through blocks of a cut buffer */
int n; /* total number of blocks in list */
n = 0;
/* first the named buffers... */
for (cb = named; cb < &named[27]; cb++)
{
if (cb->fd > 0)
continue;
for (i = cb->nblks; i-- > 0; )
{
need->n[n++] = cb->phys[i];
}
}
/* then the anonymous buffers */
for (cb = annon; cb < &annon[NANNONS]; cb++)
{
if (cb->fd > 0)
continue;
for (i = cb->nblks; i-- > 0; )
{
need->n[n++] = cb->phys[i];
}
}
return n;
}
#endif
/* This function frees a cut buffer */
static void cutfree(buf)
struct cutbuf *buf;
{
char cutfname[50];
int i;
/* return immediately if the buffer is already empty */
if (buf->nblks <= 0)
{
return;
}
/* else free up stuff */
buf->nblks = 0;
#ifdef DEBUG
if (!buf->phys)
msg("cutfree() tried to free an NULL buf->phys pointer.");
#endif
free((char *)buf->phys);
/* see if anybody else needs this tmp file */
if (buf->fd >= 0)
{
for (i = 0; i < 27; i++)
{
if (named[i].nblks > 0 && named[i].fd == buf->fd)
{
break;
}
}
}
/* if nobody else needs it, then discard the tmp file */
if (buf->fd >= 0 && i == 27)
{
close(buf->fd);
#if MSDOS || TOS
strcpy(cutfname, o_directory);
if ((i = strlen(cutfname)) && !strchr(":/\\", cutfname[i-1]))
cutfname[i++]=SLASH;
sprintf(cutfname+i, CUTNAME+3, getpid(), buf->fd);
#else
sprintf(cutfname, CUTNAME, o_directory, getpid(), buf->fd);
#endif
unlink(cutfname);
}
}
/* This function is called when we are about to abort a tmp file. If any
* cut buffers still need the file, then a copy of the file should be
* created for use by the cut buffers.
*
* To minimize the number of extra files lying around, only named cut buffers
* are preserved in a file switch; the annonymous buffers just go away.
*/
void cutswitch(tmpname)
char *tmpname; /* name of the tmp file */
{
char cutfname[50]; /* used to build a new name for the tmp file */
int fd; /* a new fd for the current tmp file */
int i;
#if MSDOS || TOS
int j;
#endif
/* discard all annonymous cut buffers */
for (i = 0; i < NANNONS; i++)
{
cutfree(&annon[i]);
}
/* find the first named buffer that uses this tmp file */
for (i = 0; i < 27; i++)
{
if (named[i].nblks > 0 && named[i].fd < 0)
{
break;
}
}
/* if none of them use this tmp file, then we're done */
if (i == 27)
{
return;
}
/* else we'll need this file and an fd a little longer */
#if MSDOS || TOS
strcpy(cutfname, o_directory);
if ((j = strlen(cutfname)) && !strchr(":/\\", cutfname[j-1]))
cutfname[j++]=SLASH;
close(tmpfd);
fd = open(tmpname, O_RDONLY|O_BINARY);
close(fd);
sprintf(cutfname+j, CUTNAME+3, getpid(), fd);
rename(tmpname, cutfname);
fd = open(cutfname, O_RDONLY|O_BINARY);
tmpfd = -1; /* we'll try to close this in tmp.c, but who cares? */
#else
fd = dup(tmpfd);
# if OSK
sprintf(cutfname, CUTNAME, "", getpid(), fd);
if (!link(tmpname, &cutfname[1])) /* skip slash */
unlink(tmpname);
# else
sprintf(cutfname, CUTNAME, o_directory, getpid(), fd);
link(tmpname, cutfname) || unlink(tmpname);
# endif
#endif
/* have all cut buffers use the new fd instead */
for (; i < 27; i++)
{
if (named[i].nblks > 0 && named[i].fd < 0)
{
named[i].fd = fd;
}
}
}
/* This function should be called just before termination of vi */
void cutend()
{
int i;
/* free all named cut buffers, since they might be forcing an older
* tmp file to be retained.
*/
for (i = 0; i < 27; i++)
{
cutfree(&named[i]);
}
}
/* This function is used to select the cut buffer to be used next */
void cutname(name)
int name; /* a single character */
{
cbname = name;
}
/* This function copies a selected segment of text to a cut buffer */
void cut(from, to)
MARK from; /* start of text to cut */
MARK to; /* end of text to cut */
{
int first; /* logical number of first block in cut */
int last; /* logical number of last block used in cut */
long line; /* a line number */
int lnmode; /* boolean: will this be a line-mode cut? */
MARK delthru;/* end of text temporarily inserted for apnd */
REG struct cutbuf *cb;
REG long l;
REG int i;
REG char *scan;
char *blkc;
/* detect whether this must be a line-mode cut or char-mode cut */
if (markidx(from) == 0 && markidx(to) == 0)
lnmode = TRUE;
else
lnmode = FALSE;
/* by default, we don't "delthru" anything */
delthru = MARK_UNSET;
/* decide which cut buffer to use */
if (!cbname)
{
/* free up the last annonymous cut buffer */
cutfree(&annon[NANNONS - 1]);
/* shift the annonymous cut buffers */
for (i = NANNONS - 1; i > 0; i--)
{
annon[i] = annon[i - 1];
}
/* use the first annonymous cut buffer */
cb = annon;
cb->nblks = 0;
}
else if (cbname >= 'a' && cbname <= 'z')
{
cb = &named[cbname - 'a'];
cutfree(cb);
}
#ifndef CRUNCH
else if (cbname >= 'A' && cbname <= 'Z')
{
cb = &named[cbname - 'A'];
if (cb->nblks > 0)
{
/* resolve linemode/charmode differences */
if (!lnmode && cb->lnmode)
{
from &= ~(BLKSIZE - 1);
if (markidx(to) != 0 || to == from)
{
to = to + BLKSIZE - markidx(to);
}
lnmode = TRUE;
}
/* insert the old cut-buffer before the new text */
mark[28] = to;
delthru = paste(from, FALSE, TRUE);
if (delthru == MARK_UNSET)
{
return;
}
delthru++;
to = mark[28];
}
cutfree(cb);
}
#endif /* not CRUNCH */
else if (cbname == '.')
{
cb = &named[26];
cutfree(cb);
}
else
{
msg("Invalid cut buffer name: \"%c", cbname);
cbname = '\0';
return;
}
cbname = '\0';
cb->fd = -1;
/* detect whether we're doing a line mode cut */
cb->lnmode = lnmode;
/* ---------- */
/* Reporting... */
if (markidx(from) == 0 && markidx(to) == 0)
{
rptlines = markline(to) - markline(from);
rptlabel = "yanked";
}
/* ---------- */
/* make sure each block has a physical disk address */
blksync();
/* find the first block in the cut */
line = markline(from);
for (first = 1; line > lnum[first]; first++)
{
}
/* fetch text of the block containing that line */
blkc = scan = blkget(first)->c;
/* find the mark in the block */
for (l = lnum[first - 1]; ++l < line; )
{
while (*scan++ != '\n')
{
}
}
scan += markidx(from);
/* remember the offset of the start */
cb->start = scan - blkc;
/* ---------- */
/* find the last block in the cut */
line = markline(to);
for (last = first; line > lnum[last]; last++)
{
}
/* fetch text of the block containing that line */
if (last != first)
{
blkc = scan = blkget(last)->c;
}
else
{
scan = blkc;
}
/* find the mark in the block */
for (l = lnum[last - 1]; ++l < line; )
{
while (*scan++ != '\n')
{
}
}
if (markline(to) <= nlines)
{
scan += markidx(to);
}
/* remember the offset of the end */
cb->end = scan - blkc;
/* ------- */
/* remember the physical block numbers of all included blocks */
cb->nblks = last - first;
if (cb->end > 0)
{
cb->nblks++;
}
#ifdef lint
cb->phys = (short *)0;
#else
cb->phys = (short *)malloc((unsigned)(cb->nblks * sizeof(short)));
#endif
for (i = 0; i < cb->nblks; i++)
{
cb->phys[i] = hdr.n[first++];
}
#ifndef CRUNCH
/* if we temporarily inserted text for appending, then delete that
* text now -- before the user sees it.
*/
if (delthru)
{
line = rptlines;
delete(from, delthru);
rptlines = line;
rptlabel = "yanked";
}
#endif /* not CRUNCH */
}
static void readcutblk(cb, blkno)
struct cutbuf *cb;
int blkno;
{
int fd; /* either tmpfd or cb->fd */
/* decide which fd to use */
if (cb->fd >= 0)
{
fd = cb->fd;
}
else
{
fd = tmpfd;
}
/* get the block */
lseek(fd, (long)cb->phys[blkno] * (long)BLKSIZE, 0);
if (read(fd, tmpblk.c, (unsigned)BLKSIZE) != BLKSIZE)
{
msg("Error reading back from tmp file for pasting!");
}
}
/* This function inserts text from a cut buffer, and returns the MARK where
* insertion ended. Return MARK_UNSET on errors.
*/
MARK paste(at, after, retend)
MARK at; /* where to insert the text */
int after; /* boolean: insert after mark? (rather than before) */
int retend; /* boolean: return end of text? (rather than start) */
{
REG struct cutbuf *cb;
REG int i;
/* decide which cut buffer to use */
if (cbname >= 'A' && cbname <= 'Z')
{
cb = &named[cbname - 'A'];
}
else if (cbname >= 'a' && cbname <= 'z')
{
cb = &named[cbname - 'a'];
}
else if (cbname >= '1' && cbname <= '9')
{
cb = &annon[cbname - '1'];
}
else if (cbname == '.')
{
cb = &named[26];
}
else if (!cbname)
{
cb = annon;
}
else
{
msg("Invalid cut buffer name: \"%c", cbname);
cbname = '\0';
return MARK_UNSET;
}
/* make sure it isn't empty */
if (cb->nblks == 0)
{
if (cbname)
msg("Cut buffer \"%c is empty", cbname);
else
msg("Cut buffer is empty");
cbname = '\0';
return MARK_UNSET;
}
cbname = '\0';
/* adjust the insertion MARK for "after" and line-mode cuts */
if (cb->lnmode)
{
at &= ~(BLKSIZE - 1);
if (after)
{
at += BLKSIZE;
}
}
else if (after)
{
/* careful! if markidx(at) == 0 we might be pasting into an
* empty line -- so we can't blindly increment "at".
*/
if (markidx(at) == 0)
{
pfetch(markline(at));
if (plen != 0)
{
at++;
}
}
else
{
at++;
}
}
/* put a copy of the "at" mark in the mark[] array, so it stays in
* sync with changes made via add().
*/
mark[27] = at;
/* simple one-block paste? */
if (cb->nblks == 1)
{
/* get the block */
readcutblk(cb, 0);
/* isolate the text we need within it */
if (cb->end)
{
tmpblk.c[cb->end] = '\0';
}
/* insert it */
ChangeText
{
add(at, &tmpblk.c[cb->start]);
}
}
else
{
/* multi-block paste */
ChangeText
{
i = cb->nblks - 1;
/* add text from the last block first */
if (cb->end > 0)
{
readcutblk(cb, i);
tmpblk.c[cb->end] = '\0';
add(at, tmpblk.c);
i--;
}
/* add intervening blocks */
while (i > 0)
{
readcutblk(cb, i);
add(at, tmpblk.c);
i--;
}
/* add text from the first cut block */
readcutblk(cb, 0);
add(at, &tmpblk.c[cb->start]);
}
}
/* Reporting... */
rptlines = markline(mark[27]) - markline(at);
rptlabel = "pasted";
/* return the mark at the beginning/end of inserted text */
if (retend)
{
return mark[27] - 1L;
}
return at;
}
#ifndef NO_AT
/* This function copies characters from a cut buffer into a string.
* It returns the number of characters in the cut buffer. If the cut
* buffer is too large to fit in the string (i.e. if cb2str() returns
* a number >= size) then the characters will not have been copied.
* It returns 0 if the cut buffer is empty, and -1 for invalid cut buffers.
*/
int cb2str(name, buf, size)
int name; /* the name of a cut-buffer to get: a-z only! */
char *buf; /* where to put the string */
unsigned size; /* size of buf */
{
REG struct cutbuf *cb;
REG char *src;
REG char *dest;
/* decide which cut buffer to use */
if (name >= 'a' && name <= 'z')
{
cb = &named[name - 'a'];
}
else
{
return -1;
}
/* if the buffer is empty, return 0 */
if (cb->nblks == 0)
{
return 0;
}
/* !!! if not a single-block cut, then fail */
if (cb->nblks != 1)
{
return size;
}
/* if too big, return the size now, without doing anything */
if (cb->end - cb->start >= size)
{
return cb->end - cb->start;
}
/* get the block */
readcutblk(cb, 0);
/* isolate the string within that blk */
if (cb->start == 0)
{
tmpblk.c[cb->end] = '\0';
}
else
{
for (dest = tmpblk.c, src = dest + cb->start; src < tmpblk.c + cb->end; )
{
*dest++ = *src++;
}
*dest = '\0';
}
/* copy the string into the buffer */
if (buf != tmpblk.c)
{
strcpy(buf, tmpblk.c);
}
/* return the length */
return cb->end - cb->start;
}
#endif