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columns.c
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columns.c
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/* Routines to deal with column numbering */
/* Copyright (c) 1981,1980 James Gosling */
#include "window.h"
#include "buffer.h"
/* calculate the print column at dot */
CalcCol () {
register p = ScanBf ('\n', dot, -1);
register col = 1;
while (p < dot) {
register char c = CharAt (p);
if (c == 011)
col = ((col - 1) / bf_mode.md_TabSize + 1)
* bf_mode.md_TabSize + 1;
else
if (c < 040 || c >= 0177)
col += CtlArrow ? 2 : 4;
else
col += 1;
p++;
}
DotCol = col;
ColValid++;
return col;
}
/* Insert tabs and spaces until we're out to at least column n */
ToCol (n) {
register col = CurCol;
register ncol;
if (col >= n)
return;
while ((ncol = ((col - 1) / bf_mode.md_TabSize + 1) * bf_mode.md_TabSize + 1) <= n) {
SelfInsert ('\t');
col = ncol;
}
while (col < n) {
SelfInsert (' ');
col++;
}
DotCol = col;
ColValid = 1;
}
/* Calculate the indentation of the current line */
CurIndent () {
register p = ScanBf ('\n', dot, -1);
register col = 1;
register lim = NumCharacters;
while (p <= lim) {
register char c = CharAt (p);
if (c == 011)
col = ((col - 1) / bf_mode.md_TabSize + 1)
* bf_mode.md_TabSize + 1;
else
if (c == 040)
col += 1;
else
break;
p++;
}
return col;
}