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Fix bounds checks of dc.col

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dc.collen is the length of dc.col, not the maximum index, hence if x is
equal to dc.collen, then it's an error.

With config.def.h, the last valid index is 259, so this correctly
reports "black":

    $ printf '\033]4;259;?\e\\'

260 is an invalid index and this reports garbage instead of printing an
error:

    $ printf '\033]4;260;?\e\\'

ref.
https://git.suckless.org/st/commit/a6bbc0c96b0a1db804061b0db79101c6b26aec57.html
This commit is contained in:
Bakkeby 2023-10-08 20:18:30 +02:00
parent 4a1d981d54
commit 859906235e
1 changed files with 2 additions and 2 deletions
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4
x.c
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@ -1002,7 +1002,7 @@ xloadcols(void)
int
xgetcolor(int x, unsigned char *r, unsigned char *g, unsigned char *b)
{
if (!BETWEEN(x, 0, dc.collen))
if (!BETWEEN(x, 0, dc.collen - 1))
return 1;
*r = dc.col[x].color.red >> 8;
@ -1017,7 +1017,7 @@ xsetcolorname(int x, const char *name)
{
Color ncolor;
if (!BETWEEN(x, 0, dc.collen))
if (!BETWEEN(x, 0, dc.collen - 1))
return 1;
if (!xloadcolor(x, name, &ncolor))