Re: [PATCH 3/9] configurator: Inline err.h functions from musl libc

[David Gibson <david@gibson.dropbear.id.au>]

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On Sun, Sep 18, 2016 at 06:52:00PM -0600, Kevin Locke wrote:
> Since we can't use HAVE_ERR_H in configurator, provide a definition for
> the err.h functions used.  The version provided is the one from musl
> libc, since it is concise and shares the MIT License with configurator.
> 
> Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

Right, so this is a general problem of how do we make the configurator
itself sufficiently portable, since it hasn't yet worked out the
portbility macros.

Personally, I think duplicating these here is an acceptable
workaround.  Rusty, any opinion?

> ---
>  tools/configurator/configurator.c | 54 ++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 53 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/configurator/configurator.c b/tools/configurator/configurator.c
> index 9817fcd..9dcf307 100644
> --- a/tools/configurator/configurator.c
> +++ b/tools/configurator/configurator.c
> @@ -3,6 +3,9 @@
>   *
>   * Copyright 2011 Rusty Russell <rusty@rustcorp.com.au>.  MIT license.
>   *
> + * err, errx, verr, verrx, vwarn, vwarnx functions from musl libc
> + * Copyright 2005-2013 Rich Felker.  MIT license.
> + *
>   * Permission is hereby granted, free of charge, to any person obtaining a copy
>   * of this software and associated documentation files (the "Software"), to deal
>   * in the Software without restriction, including without limitation the rights
> @@ -22,9 +25,9 @@
>   * THE SOFTWARE.
>   */
>  #include <stdio.h>
> +#include <stdarg.h>
>  #include <stdbool.h>
>  #include <stdlib.h>
> -#include <err.h>
>  #include <string.h>
>  
>  #ifdef _MSC_VER
> @@ -38,6 +41,7 @@
>  #define OUTPUT_FILE "configurator.out"
>  #define INPUT_FILE "configuratortest.c"
>  
> +static const char *progname = "";
>  static int verbose;
>  
>  enum test_style {
> @@ -367,6 +371,51 @@ static struct test tests[] = {
>  	},
>  };
>  
> +static void vwarn(const char *fmt, va_list ap)
> +{
> +	fprintf (stderr, "%s: ", progname);
> +	if (fmt) {
> +		vfprintf(stderr, fmt, ap);
> +		fputs (": ", stderr);
> +	}
> +	perror(0);
> +}
> +
> +static void vwarnx(const char *fmt, va_list ap)
> +{
> +	fprintf (stderr, "%s: ", progname);
> +	if (fmt) vfprintf(stderr, fmt, ap);
> +	putc('\n', stderr);
> +}
> +
> +static void verr(int status, const char *fmt, va_list ap)
> +{
> +	vwarn(fmt, ap);
> +	exit(status);
> +}
> +
> +static void verrx(int status, const char *fmt, va_list ap)
> +{
> +	vwarnx(fmt, ap);
> +	exit(status);
> +}
> +
> +static void err(int status, const char *fmt, ...)
> +{
> +	va_list ap;
> +	va_start(ap, fmt);
> +	verr(status, fmt, ap);
> +	va_end(ap);
> +}
> +
> +static void errx(int status, const char *fmt, ...)
> +{
> +	va_list ap;
> +	va_start(ap, fmt);
> +	verrx(status, fmt, ap);
> +	va_end(ap);
> +}
> +
>  static char *grab_stream(FILE *file)
>  {
>  	size_t max, ret, size = 0;
> @@ -593,6 +642,9 @@ int main(int argc, const char *argv[])
>  	const char *default_args[]
>  		= { "", DEFAULT_COMPILER, DEFAULT_FLAGS, NULL };
>  
> +	if (argc > 0)
> +		progname = argv[0];
> +
>  	if (argc > 1) {
>  		if (strcmp(argv[1], "--help") == 0) {
>  			printf("Usage: configurator [-v] [<compiler> <flags>...]\n"

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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