104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
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/* misc.c */
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/* Author:
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* Steve Kirkendall
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* 14407 SW Teal Blvd. #C
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* Beaverton, OR 97005
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* kirkenda@cs.pdx.edu
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*/
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/* This file contains functions which didn't seem happy anywhere else */
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#include "config.h"
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#include "vi.h"
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/* find a particular line & return a pointer to a copy of its text */
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char *fetchline(line)
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long line; /* line number of the line to fetch */
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{
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int i;
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REG char *scan; /* used to search for the line in a BLK */
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long l; /* line number counter */
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static BLK buf; /* holds ONLY the selected line (as string) */
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REG char *cpy; /* used while copying the line */
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static long nextline; /* } These four variables are used */
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static long chglevel; /* } to implement a shortcut when */
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static char *nextscan; /* } consecutive lines are fetched */
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static long nextlnum; /* } */
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/* can we do a shortcut? */
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if (changes == chglevel && line == nextline)
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{
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scan = nextscan;
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}
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else
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{
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/* scan lnum[] to determine which block its in */
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for (i = 1; line > lnum[i]; i++)
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{
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}
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nextlnum = lnum[i];
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/* fetch text of the block containing that line */
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scan = blkget(i)->c;
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/* find the line in the block */
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for (l = lnum[i - 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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}
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/* copy it into a block by itself, with no newline */
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for (cpy = buf.c; *scan != '\n'; )
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{
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*cpy++ = *scan++;
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}
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*cpy = '\0';
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/* maybe speed up the next call to fetchline() ? */
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if (line < nextlnum)
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{
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nextline = line + 1;
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chglevel = changes;
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nextscan = scan + 1;
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}
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else
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{
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nextline = 0;
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}
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/* Calls to fetchline() interfere with calls to pfetch(). Make sure
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* that pfetch() resets itself on its next invocation.
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*/
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pchgs = 0L;
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/* Return a pointer to the line's text */
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return buf.c;
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}
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/* error message from the regexp code */
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void regerror(txt)
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char *txt; /* an error message */
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{
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msg("RE error: %s", txt);
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}
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/* This function is equivelent to the pfetch() macro */
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void pfetch(l)
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long l; /* line number of line to fetch */
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{
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if(l != pline || changes != pchgs)
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{
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pline = (l);
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ptext = fetchline(pline);
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plen = strlen(ptext);
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pchgs = changes;
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}
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}
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