src/operand2sig.c

   1 /* operand2sig.c -- common function for parsing signal specifications
   2    Copyright (C) 2008-2016 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Extracted from kill.c/timeout.c by Pádraig Brady.
  18    FIXME: Move this to gnulib/str2sig.c */
  19
  20
  21 /* Convert OPERAND to a signal number with printable representation SIGNAME.
  22    Return the signal number, or -1 if unsuccessful.  */
  23
  24 #include <config.h>
  25 #include <stdio.h>
  26 #include <sys/types.h>
  27 #include <sys/wait.h>
  28
  29 #include "system.h"
  30 #include "error.h"
  31 #include "quote.h"
  32 #include "sig2str.h"
  33 #include "operand2sig.h"
  34
  35 extern int
  36 operand2sig (char const *operand, char *signame)
  37 {
  38   int signum;
  39
  40   if (ISDIGIT (*operand))
  41     {
  42       char *endp;
  43       long int l = (errno = 0, strtol (operand, &endp, 10));
  44       int i = l;
  45       signum = (operand == endp || *endp || errno || i != l ? -1
  46                 : WIFSIGNALED (i) ? WTERMSIG (i) : i);
  47     }
  48   else
  49     {
  50       /* Convert signal to upper case in the C locale, not in the
  51          current locale.  Don't assume ASCII; it might be EBCDIC.  */
  52       char *upcased = xstrdup (operand);
  53       char *p;
  54       for (p = upcased; *p; p++)
  55         if (strchr ("abcdefghijklmnopqrstuvwxyz", *p))
  56           *p += 'A' - 'a';
  57
  58       /* Look for the signal name, possibly prefixed by "SIG",
  59          and possibly lowercased.  */
  60       if (!(str2sig (upcased, &signum) == 0
  61             || (upcased[0] == 'S' && upcased[1] == 'I' && upcased[2] == 'G'
  62                 && str2sig (upcased + 3, &signum) == 0)))
  63         signum = -1;
  64
  65       free (upcased);
  66     }
  67
  68   if (signum < 0 || sig2str (signum, signame) != 0)
  69     {
  70       error (0, 0, _("%s: invalid signal"), quote (operand));
  71       return -1;
  72     }
  73
  74   return signum;
  75 }