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/* @(#)avoffset.c 1.15 00/05/07 Copyright 1987 J. Schilling */
#ifndef lint
static char sccsid[] =
"@(#)avoffset.c 1.15 00/05/07 Copyright 1987 J. Schilling";
#endif
/*
* This program is a tool to generate the file "avoffset.h".
* It is used by functions that trace the stack to get to the top of the stack.
*
* It generates two defines:
* AV_OFFSET - offset of argv relative to the main() frame pointer
* FP_INDIR - number of stack frames above main()
* before encountering a NULL pointer.
*
* Copyright (c) 1987 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <mconfig.h>
#include <stdio.h>
#include <standard.h>
#include <schily.h>
#include <stdxlib.h>
#include <signal.h>
#ifdef NO_SCANSTACK
# ifdef HAVE_SCANSTACK
# undef HAVE_SCANSTACK
# endif
#endif
#ifdef HAVE_SCANSTACK
# include <stkframe.h>
#endif
LOCAL RETSIGTYPE handler __PR((int signo));
EXPORT int main __PR((int ac, char** av));
LOCAL RETSIGTYPE
handler(signo)
int signo;
{
fprintf(stderr, "Warning: Cannot scan stack on this environment.\n");
exit(0);
}
int main(ac, av)
int ac;
char **av;
{
#ifdef HAVE_SCANSTACK
register struct frame *fp = (struct frame *)getfp();
register int i = 0;
#endif
signal(SIGBUS, handler);
signal(SIGSEGV, handler);
printf("/*\n");
printf(" * This file has been generated automatically\n");
printf(" * by %s\n", sccsid);
printf(" * do not edit by hand.\n");
printf(" *\n");
printf(" * This file includes definitions for AV_OFFSET and FP_INDIR.\n");
printf(" * FP_INDIR is the number of fp chain elements above 'main'.\n");
printf(" * AV_OFFSET is the offset of &av[0] relative to the frame pointer in 'main'.\n");
printf(" *\n");
printf(" * If getav0() does not work on a specific architecture\n");
printf(" * the program which generated this include file may dump core.\n");
printf(" * In this case, the generated include file does not include\n");
printf(" * definitions for AV_OFFSET and FP_INDIR but ends after this comment.\n");
printf(" * If AV_OFFSET or FP_INDIR are missing in this file, all programs\n");
printf(" * which use the definitions are automatically disabled.\n");
printf(" */\n");
fflush(stdout);
#ifdef HAVE_SCANSTACK
while (fp->fr_savfp) {
fp = (struct frame *)fp->fr_savfp;
if (fp->fr_savpc == 0)
break;
i++;
}
/*
* Do not add any printf()'s before this line to allow avoffset
* to abort without printing more than the comment above.
*/
fp = (struct frame *)getfp();
printf("#define AV_OFFSET %d\n", (int)(av-(char **)fp));
printf("#define FP_INDIR %d\n", i);
#endif
exit(0);
return (0); /* keep lint happy */
}
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