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Date: Thu, 30 Mar 2023 03:25:11 +0000
From: "Peter Stuge (peter AT stuge DOT se) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] lepton-sch2pcb: wrong ${prefix} for pcb
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Hi Karl,

karl AT aspodata DOT se [via geda-user AT delorie DOT com] wrote:
> What sch2pcb wants is to find common.m4 and the footprint files.
> But how?
> 
> 1, the dirname trick:
>  $(dirname $(dirname $(which pcb)))/share/pcb
>  followed by m4, pcblib-newlib alt. newlib depending of what
>  we are looking for

This isn't a good choice at all since it makes assumptions about how
pcb was compiled - specifically that there is a fixed relationship
between the pcb binary path and the library path.


> 3, test /usr /usr/local etc. for share/pcb/m4/common.m4 etc.

This would be better than 1 but much worse than 2.


> 2, convince pcb devs. to add some cmdline option like
>  $ pcb --libpath
>  /usr/local/share/pcb

This is by far the best!


karl AT aspodata DOT se [via geda-user AT delorie DOT com] wrote:
> pcb already have:
>   boxA:
> $ pcb --show-defaults 2>&1 | grep lib-command-dir
> lib-command-dir "/home/local/bin/../share/pcb"
> 
>   boxB:
> $ pcb --show-defaults 2>&1 | grep lib-command-dir
> lib-command-dir "/usr/bin/../share/pcb"

Perfect! Great find.


karl AT aspodata DOT se [via geda-user AT delorie DOT com] wrote:
> >  But unfortunately, pcb depends on X beeing available:
> > $ pcb --show-defaults
> > Error: Can't open display: 
> 
> "pcb -x ps --show-defaults" solves that.

Okay - attached is a C snippet to grab the string.


//Peter

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#define _POSIX_C_SOURCE 2 /* popen pclose */
#define _XOPEN_SOURCE 500 /* realpath */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <sys/types.h>
#include <string.h>

int main(int argc, char *argv[]) {
	int ret = EXIT_FAILURE;
	FILE *p;
	char buf[64 + PATH_MAX], *libdir, real_dir[PATH_MAX];
	size_t n;

	p = popen("pcb -x ps --show-defaults 2>&1", "r");
	if (NULL == p) {
		perror("popen");
		exit(EXIT_FAILURE);
	}

	while (fgets(buf, sizeof buf, p)) {
		if (strncmp(buf, "lib-command-dir ", 16))
			continue;

		libdir = buf + 16;
		if ('"' == libdir[0])
			libdir++;

		n = strlen(libdir);
		while (n > 0 && strchr("\r\n\t ", libdir[n - 1]))
			libdir[--n] = 0;

		if (n > 0 && '"' == libdir[n - 1])
			libdir[--n] = 0;

		printf("libdir   '%s'\n", libdir);

		if (NULL == realpath(libdir, real_dir)) {
			perror("realpath");
			continue;
		}

		printf("real dir '%s'\n", real_dir);

		ret = EXIT_SUCCESS;
	}

	pclose(p);
	return ret;
}

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