I finally got back to this. It's pretty a small thing, but makes
lining up certain screens a lot easier (e.g. "olist all" with colored
objects). The only problem I've found is running gcc with -Wall turns
on -Wformat, which I like, except gcc complains about the new %T
conversion type being unknown. I can't figure out any way to register
a new conversion type with the compiler. Anyway...
printf("-%10.5s-\n", "{Rtesting");
printf("-%10.5T-\n", "{Rtesting");
Results in:
- {Rtes-
- {Rtesti-
So when the color codes go invisible, the truncation and padding are
right using %T instead of %s. I also decided to use the + flag to
capitalize the first character of the argument. May add some other
niceties later. Here's the code so far:
#include <stdio.h>
#include <printf.h>
int printf_coloured_string(FILE *stream, const struct printf_info
*info, const void *const *args)
{
int length = 0, padding = 0, out = 0;
const char *src = *((const char **)(*args));
//see how long the string is
for (out = 0; src[out]; out++)
{
if (src[out] == '{')
out++;
else
length++;
}
//check for truncation
if ((info->prec >= 0) && (length > info->prec))
length = info->prec;
//calculate padding
padding = (info->width - length);
//figure out how much of the string to write out
for (out = 0; length > 0 || src[out] == '{'; out++)
{
if (src[out] == '{')
out++;
else
length--;
}
//left padding
if (!info->left)
for (length = 0; padding > length; length++)
fputc(' ', stream);
//capitalization
if (info->showsign)
{
for (length = 0; (length < out) && src[length] == '{'; length += 2)
;
fwrite(src, length, 1, stream);
fputc(toupper(src[length]), stream);
fwrite(&src[length+1], out - (length + 1), 1, stream);
}
//no capitalization
else
fwrite(src, out, 1, stream);
// right padding
if (info->left)
for (length = 0; padding > length; length++)
fputc(' ', stream);
return padding + out;
}
int printf_coloured_string_arginfo(const struct printf_info *info,
size_t n, int *argtypes)
{
if (n > 0)
argtypes[0] = PA_STRING;
return 1;
}
void init_printf_ext()
{
register_printf_function('T', &printf_coloured_string,
&printf_coloured_string_arginfo);
}
--Palrich.
On 9/12/05, Dennis <[EMAIL PROTECTED]> wrote:
> If you're using GNU libc, you can extend the printf family of functions
> with your own % codes. That could save you some work by not having
> to re-implement the existing *printf functionality.
>
> http://www.gnu.org/software/libc/manual/html_node/Customizing-Printf.html
>
>
> Dennis
>
>
> On Mon, 12 Sep 2005, Michael Barton wrote:
>
> > I was wanting to re-implement vs(n)printf to correctly pad and
> > truncate strings with Lope's color codes in them, since lining things
> > up can be such a pain. I thought to get the bsd version and work from
> > that, but it's... verbose. I'm sure it has to be.
> >
> > I started on my own and, ugly and incomplete though it is, seems to be
> > a working start.
> >
> > I'd also like to include % codes for CHAR_DATA, OBJ_DATA, etc, so I
> > can effectively replace act() with chprintf() entirely while I'm at
> > it.
> >
> > Has anyone else tackled this?
> >
> > --Palrich.
> > --
> > ROM mailing list
> > [EMAIL PROTECTED]
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> >
>
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