474 lines
9.6 KiB
C
474 lines
9.6 KiB
C
/* modify.c */
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/* This file contains the low-level file modification functions:
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* delete(frommark, tomark) - removes line or portions of lines
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* add(frommark, text) - inserts new text
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* change(frommark, tomark, text) - delete, then add
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*/
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#include "config.h"
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#include "vi.h"
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#ifdef DEBUG2
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# include <stdio.h>
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static FILE *dbg;
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/*VARARGS1*/
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debout(msg, arg1, arg2, arg3, arg4, arg5)
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char *msg, *arg1, *arg2, *arg3, *arg4, *arg5;
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{
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if (!dbg)
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{
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dbg = fopen("debug.out", "w");
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if (!dbg)
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return;
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setbuf(dbg, (FILE *)0);
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}
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fprintf(dbg, msg, arg1, arg2, arg3, arg4, arg5);
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}
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#endif /* DEBUG2 */
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/* delete a range of text from the file */
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void delete(frommark, tomark)
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MARK frommark; /* first char to be deleted */
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MARK tomark; /* AFTER last char to be deleted */
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{
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int i; /* used to move thru logical blocks */
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REG char *scan; /* used to scan thru text of the blk */
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REG char *cpy; /* used when copying chars */
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BLK *blk; /* a text block */
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long l; /* a line number */
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MARK m; /* a traveling version of frommark */
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#ifdef DEBUG2
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debout("delete(%ld.%d, %ld.%d)\n", markline(frommark), markidx(frommark), markline(tomark), markidx(tomark));
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#endif
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/* if not deleting anything, quit now */
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if (frommark == tomark)
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{
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return;
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}
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/* This is a change */
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changes++;
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significant = TRUE;
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/* supply clues to the redraw module */
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redrawrange(markline(frommark), markline(tomark), markline(frommark));
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/* adjust marks 'a through 'z and '' as needed */
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l = markline(tomark);
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for (i = 0; i < NMARKS; i++)
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{
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if (mark[i] < frommark)
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{
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continue;
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}
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else if (mark[i] < tomark)
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{
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mark[i] = MARK_UNSET;
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}
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else if (markline(mark[i]) == l)
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{
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if (markline(frommark) == l)
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{
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mark[i] -= markidx(tomark) - markidx(frommark);
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}
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else
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{
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mark[i] -= markidx(tomark);
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}
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}
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else
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{
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mark[i] -= MARK_AT_LINE(l - markline(frommark));
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}
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}
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/* Reporting... */
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if (markidx(frommark) == 0 && markidx(tomark) == 0)
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{
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rptlines = markline(tomark) - markline(frommark);
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rptlabel = "deleted";
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}
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/* find the block containing frommark */
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l = markline(frommark);
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for (i = 1; lnum[i] < l; i++)
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{
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}
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/* process each affected block... */
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for (m = frommark;
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m < tomark && lnum[i] < INFINITY;
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m = MARK_AT_LINE(lnum[i - 1] + 1))
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{
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/* fetch the block */
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blk = blkget(i);
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/* find the mark in the block */
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scan = blk->c;
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for (l = markline(m) - lnum[i - 1] - 1; l > 0; l--)
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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(m);
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/* figure out where the changes to this block end */
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if (markline(tomark) > lnum[i])
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{
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cpy = blk->c + BLKSIZE;
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}
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else if (markline(tomark) == markline(m))
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{
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cpy = scan - markidx(m) + markidx(tomark);
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}
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else
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{
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cpy = scan;
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for (l = markline(tomark) - markline(m);
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l > 0;
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l--)
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{
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while (*cpy++ != '\n')
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{
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}
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}
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cpy += markidx(tomark);
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}
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/* delete the stuff by moving chars within this block */
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while (cpy < blk->c + BLKSIZE)
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{
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*scan++ = *cpy++;
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}
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while (scan < blk->c + BLKSIZE)
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{
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*scan++ = '\0';
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}
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/* adjust tomark to allow for lines deleted from this block */
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tomark -= MARK_AT_LINE(lnum[i] + 1 - markline(m));
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/* if this block isn't empty now, then advance i */
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if (*blk->c)
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{
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i++;
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}
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/* the buffer has changed. Update hdr and lnum. */
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blkdirty(blk);
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}
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/* must have at least 1 line */
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if (nlines == 0)
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{
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blk = blkadd(1);
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blk->c[0] = '\n';
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blkdirty(blk);
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cursor = MARK_FIRST;
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}
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}
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/* add some text at a specific place in the file */
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void add(atmark, newtext)
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MARK atmark; /* where to insert the new text */
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char *newtext; /* NUL-terminated string to insert */
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{
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REG char *scan; /* used to move through string */
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REG char *build; /* used while copying chars */
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int addlines; /* number of lines we're adding */
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int lastpart; /* size of last partial line */
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BLK *blk; /* the block to be modified */
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int blkno; /* the logical block# of (*blk) */
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REG char *newptr; /* where new text starts in blk */
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BLK buf; /* holds chars from orig blk */
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BLK linebuf; /* holds part of line that didn't fit */
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BLK *following; /* the BLK following the last BLK */
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int i;
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long l;
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#ifdef DEBUG2
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debout("add(%ld.%d, \"%s\")\n", markline(atmark), markidx(atmark), newtext);
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#endif
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#ifdef lint
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buf.c[0] = 0;
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#endif
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/* if not adding anything, return now */
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if (!*newtext)
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{
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return;
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}
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/* This is a change */
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changes++;
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significant = TRUE;
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/* count the number of lines in the new text */
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for (scan = newtext, lastpart = addlines = 0; *scan; )
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{
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if (*scan++ == '\n')
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{
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addlines++;
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lastpart = 0;
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}
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else
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{
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lastpart++;
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}
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}
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/* Reporting... */
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if (lastpart == 0 && markidx(atmark) == 0)
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{
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rptlines = addlines;
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rptlabel = "added";
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}
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/* extract the line# from atmark */
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l = markline(atmark);
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/* supply clues to the redraw module */
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if ((markidx(atmark) == 0 && lastpart == 0) || addlines == 0)
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{
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redrawrange(l, l, l + addlines);
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}
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else
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{
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/* make sure the last line gets redrawn -- it was
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* split, so its appearance has changed
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*/
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redrawrange(l, l + 1L, l + addlines + 1L);
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}
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/* adjust marks 'a through 'z and '' as needed */
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for (i = 0; i < NMARKS; i++)
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{
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if (mark[i] < atmark)
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{
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/* earlier line, or earlier in same line: no change */
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continue;
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}
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else if (markline(mark[i]) > l)
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{
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/* later line: move down a whole number of lines */
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mark[i] += MARK_AT_LINE(addlines);
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}
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else
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{
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/* later in same line */
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if (addlines > 0)
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{
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/* multi-line add, which split this line:
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* move down, and possibly left or right,
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* depending on where the split was and how
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* much text was inserted after the last \n
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*/
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mark[i] += MARK_AT_LINE(addlines) + lastpart - markidx(atmark);
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}
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else
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{
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/* totally within this line: move right */
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mark[i] += lastpart;
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}
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}
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}
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/* get the block to be modified */
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for (blkno = 1; lnum[blkno] < l && lnum[blkno + 1] < INFINITY; blkno++)
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{
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}
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blk = blkget(blkno);
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buf = *blk;
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/* figure out where the new text starts */
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for (newptr = buf.c, l = markline(atmark) - lnum[blkno - 1] - 1;
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l > 0;
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l--)
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{
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while (*newptr++ != '\n')
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{
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}
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}
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newptr += markidx(atmark);
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/* keep start of old block */
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build = blk->c + (int)(newptr - buf.c);
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/* fill this block (or blocks) from the newtext string */
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while (*newtext)
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{
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while (*newtext && build < blk->c + BLKSIZE - 1)
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{
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*build++ = *newtext++;
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}
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if (*newtext)
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{
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/* save the excess */
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for (scan = linebuf.c + BLKSIZE;
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build > blk->c && build[-1] != '\n';
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)
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{
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*--scan = *--build;
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}
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/* write the block */
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while (build < blk->c + BLKSIZE)
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{
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*build++ = '\0';
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}
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blkdirty(blk);
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/* add another block */
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blkno++;
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blk = blkadd(blkno);
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/* copy in the excess from last time */
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for (build = blk->c; scan < linebuf.c + BLKSIZE; )
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{
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*build++ = *scan++;
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}
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}
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}
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/* fill this block(s) from remainder of orig block */
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while (newptr < buf.c + BLKSIZE && *newptr)
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{
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while (newptr < buf.c + BLKSIZE
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&& *newptr
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&& build < blk->c + BLKSIZE - 1)
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{
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*build++ = *newptr++;
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}
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if (newptr < buf.c + BLKSIZE && *newptr)
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{
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/* save the excess */
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for (scan = linebuf.c + BLKSIZE;
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build > blk->c && build[-1] != '\n';
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)
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{
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*--scan = *--build;
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}
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/* write the block */
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while (build < blk->c + BLKSIZE)
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{
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*build++ = '\0';
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}
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blkdirty(blk);
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/* add another block */
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blkno++;
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blk = blkadd(blkno);
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/* copy in the excess from last time */
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for (build = blk->c; scan < linebuf.c + BLKSIZE; )
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{
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*build++ = *scan++;
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}
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}
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}
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/* see if we can combine our last block with the following block */
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if (lnum[blkno] < nlines && lnum[blkno + 1] - lnum[blkno] < (BLKSIZE >> 6))
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{
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/* hey, we probably can! Get the following block & see... */
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following = blkget(blkno + 1);
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if (strlen(following->c) + (build - blk->c) < BLKSIZE - 1)
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{
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/* we can! Copy text from following to blk */
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for (scan = following->c; *scan; )
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{
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*build++ = *scan++;
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}
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while (build < blk->c + BLKSIZE)
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{
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*build++ = '\0';
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}
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blkdirty(blk);
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/* pretend the following was the last blk */
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blk = following;
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build = blk->c;
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}
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}
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/* that last block is dirty by now */
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while (build < blk->c + BLKSIZE)
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{
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*build++ = '\0';
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}
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blkdirty(blk);
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}
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/* change the text of a file */
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void change(frommark, tomark, newtext)
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MARK frommark, tomark;
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char *newtext;
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{
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int i;
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long l;
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char *text;
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BLK *blk;
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#ifdef DEBUG2
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debout("change(%ld.%d, %ld.%d, \"%s\")\n", markline(frommark), markidx(frommark), markline(tomark), markidx(tomark), newtext);
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#endif
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/* optimize for single-character replacement */
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if (frommark + 1 == tomark && newtext[0] && !newtext[1] && newtext[0] != '\n')
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{
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/* find the block containing frommark */
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l = markline(frommark);
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for (i = 1; lnum[i] < l; i++)
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{
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}
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/* get the block */
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blk = blkget(i);
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/* find the line within the block */
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for (text = blk->c, i = l - lnum[i - 1] - 1; i > 0; text++)
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{
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if (*text == '\n')
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{
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i--;
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}
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}
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/* replace the char */
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text += markidx(frommark);
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if (*text == newtext[0])
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{
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/* no change was needed - same char */
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return;
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}
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else if (*text != '\n')
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{
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/* This is a change */
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changes++;
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significant = TRUE;
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ChangeText
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{
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*text = newtext[0];
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blkdirty(blk);
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}
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redrawrange(markline(frommark), markline(tomark), markline(frommark));
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return;
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}
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/* else it is a complex change involving newline... */
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}
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/* couldn't optimize, so do delete & add */
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ChangeText
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{
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delete(frommark, tomark);
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add(frommark, newtext);
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rptlabel = "changed";
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}
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}
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