src/operand2sig.c

   1 /* operand2sig.c -- common function for parsing signal specifications
   2    Copyright (C) 2008-2015 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 "sig2str.h"
  32 #include "operand2sig.h"
  33
  34 extern int
  35 operand2sig (char const *operand, char *signame)
  36 {
  37   int signum;
  38
  39   if (ISDIGIT (*operand))
  40     {
  41       char *endp;
  42       long int l = (errno = 0, strtol (operand, &endp, 10));
  43       int i = l;
  44       signum = (operand == endp || *endp || errno || i != l ? -1
  45                 : WIFSIGNALED (i) ? WTERMSIG (i) : i);
  46     }
  47   else
  48     {
  49       /* Convert signal to upper case in the C locale, not in the
  50          current locale.  Don't assume ASCII; it might be EBCDIC.  */
  51       char *upcased = xstrdup (operand);
  52       char *p;
  53       for (p = upcased; *p; p++)
  54         if (strchr ("abcdefghijklmnopqrstuvwxyz", *p))
  55           *p += 'A' - 'a';
  56
  57       /* Look for the signal name, possibly prefixed by "SIG",
  58          and possibly lowercased.  */
  59       if (!(str2sig (upcased, &signum) == 0
  60             || (upcased[0] == 'S' && upcased[1] == 'I' && upcased[2] == 'G'
  61                 && str2sig (upcased + 3, &signum) == 0)))
  62         signum = -1;
  63
  64       free (upcased);
  65     }
  66
  67   if (signum < 0 || sig2str (signum, signame) != 0)
  68     {
  69       error (0, 0, _("%s: invalid signal"), operand);
  70       return -1;
  71     }
  72
  73   return signum;
  74 }