string/strsignal.c

   1 /* Copyright (C) 1991 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24
  25 #ifndef HAVE_GNU_LD
  26 #define _sys_siglist    sys_siglist
  27 #endif
  28
  29 /* Defined in , 1992siglist.c.  */
  30 extern CONST char *CONST _sys_siglist[];
  31
  32
  33 /* Return a string describing the meaning of the signal number SIGNUM.  */
  34 char *
  35 DEFUN(strsignal, (signum), int signum)
  36 {
  37   if (signum < 0 || signum > NSIG)
  38     {
  39       static char unknown_signal[] = "Unknown signal 000000000000000000";
  40       static char fmt[] = "Unknown signal%d";
  41       size_t len = sprintf(unknown_signal, fmt, signum);
  42       if (len < sizeof(fmt) - 2)
  43         return NULL;
  44       unknown_signal[len - 1] = '\0';
  45       return unknown_signal;
  46     }
  47
  48   return (char *) _sys_siglist[signum];
  49 }