Re: [HACKERS] Preliminary results for proposed new pgindent implementation

I wrote:
> Piotr Stefaniak <postgres@piotr-stefaniak.me> writes:
>> There are also the "portability fixes" and they're the main problem.

> Fair enough.

I spent some time looking into this.  I reverted your commits
198457848ae5c86bec3336a9437dd5aa30f480c2 (Replace err.h functions with
standard C equivalents) and fb10acb040b90bdcbad09defd303363db29257d1
(Remove inclusion of sys/cdefs.h) locally and tried to build without
those.  I've successfully worked around the err.h change by adding
cut-down versions of FreeBSD 11's err.h and err.c to the fileset
(see attached).  However, it's proving impossible to work around having
"#include <sys/cdefs.h>" as the first live code in the files.  I thought
maybe we could provide a dummy cdefs.h file, but that breaks things on
platforms where cdefs.h is a real thing and is relied on by other system
headers --- which includes both Linux and BSD.  It seems we would have
to have something like #ifdef HAVE_SYS_CDEFS_H, but that is already a
departure from FreeBSD practice.

So what I'm currently thinking is that we have to diverge from the
FreeBSD sources to the extent of removing #include <sys/cdefs.h>
and the __FBSDID() calls, and instead inserting #include "c.h" to
pick up PG's own portability definitions.  The thing that forced me
into the latter is that there seems no way to avoid compiler warnings
if we don't decorate the declarations of err() and errx() with noreturn
and printf-format attributes --- and we need c.h to provide portable
ways of writing those.  But there are probably other portability things
that we'll need c.h for, anyway, especially if we want to make it work
on Windows.  So I'm thinking this is a small and easily maintainable
difference from the upstream FreeBSD files.

When I inserted #include "c.h", I got duplicate-macro-definition warnings
about "true" and "false", so I would ask you to add this:

--- freebsd_indent/indent_globs.h    2017-06-16 11:06:53.329712682 -0400
+++ new/indent_globs.h    2017-06-17 14:45:41.388015754 -0400
@@ -43,8 +43,12 @@
                  * of code */
 
 
+#ifndef false
 #define false 0
+#endif
+#ifndef true
 #define true  1
+#endif
 
 
 FILE       *input;        /* the fid for the input file */

Other than that, I think this is a workable compromise on the
portability questions.

            regards, tom lane

/*-
 * Copyright (c) 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *    @(#)err.h    8.1 (Berkeley) 6/2/93
 * $FreeBSD: stable/11/include/err.h 203964 2010-02-16 19:39:50Z imp $
 */

#ifndef _ERR_H_
#define    _ERR_H_

/*
 * This is cut down to just the minimum that we need to build indent.
 */

void    err(int, const char *, ...)
  pg_attribute_noreturn() pg_attribute_printf(2, 3);
void    errx(int, const char *, ...)
  pg_attribute_noreturn() pg_attribute_printf(2, 3);

#endif /* !_ERR_H_ */
/*-
 * Copyright (c) 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * This is cut down to just the minimum that we need to build indent.
 */
#include "c.h"

#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void
err(int eval, const char *fmt, ...)
{
    int code = errno;
    va_list ap;
    va_start(ap, fmt);
    if (fmt != NULL) {
        vfprintf(stderr, fmt, ap);
        fprintf(stderr, ": ");
    }
    fprintf(stderr, "%s\n", strerror(code));
    va_end(ap);
    exit(eval);
}

void
errx(int eval, const char *fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    if (fmt != NULL)
        vfprintf(stderr, fmt, ap);
    fprintf(stderr, "\n");
    va_end(ap);
    exit(eval);
}

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