Re: adding functions to function.c

[John Graham-Cumming]

On Tue, 2005-01-11 at 13:42, Dill, John wrote:
> A little while back someone mentioned that it would be possible to add
> the functions directly to the makefile source.  Is all I do is add the
> name of the function to the list using STRING_SIZE_TUPLE, and then
> define my own function?  

I was the one that suggested you do that.  For example, suppose you were
me and you egotistically wanted to add the $(jgc TEXT) function which
printed out John Graham-Cumming followed by the expanded TEXT argument
you would do this:

1. Add a function that does the work:

static char *
func_jgc (o, argv, funcname)
     char *o;
     char **argv;
     const char *funcname;
{
  char f[256];
  sprintf( f, "John Graham-Cumming %s", argv[0] );
  return variable_buffer_output (o, f, strlen(f));
}

2. Add an entry in the function table:

  { STRING_SIZE_TUPLE("jgc"),           0,  1,  1,  func_jgc},

which states that the $(jgc) function has maximum one argument which
should be expanded before the value is passed to func_jgc.

Now consider this Makefile:

FOO := is nuts

all: ; @echo $(jgc $(FOO))

When using the augmented GNU Make with the $(jgc) function this prints

John Graham-Cumming is nuts

$(FOO) is expanded before func_jgc is called because expanding was set
to 1 and the func_jgc just returns that appropriate string in o.

John.
-- 
John Graham-Cumming

Home: http://www.jgc.org/
Work: http://www.electric-cloud.com/
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