sbin/bioctl/strtonum.c

   1 /*      $NetBSD: $ */
   2 /*      $OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $    */
   3
   4 /*
   5  * Copyright (c) 2004 Ted Unangst and Todd Miller
   6  * All rights reserved.
   7  *
   8  * Permission to use, copy, modify, and distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  */
  20 #include <sys/cdefs.h>
  21
  22 #ifndef lint
  23 __RCSID("$NetBSD: raidctl.c,v 1.38 2005/06/02 00:06:14 lukem Exp $");
  24 #endif
  25
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <stdlib.h>
  29 #include "strtonum.h"
  30
  31 #define INVALID         1
  32 #define TOOSMALL        2
  33 #define TOOLARGE        3
  34
  35 long long
  36 strtonum(const char *numstr, long long minval, long long maxval,
  37     const char **errstrp)
  38 {
  39         long long ll = 0;
  40         char *ep;
  41         int error = 0;
  42         struct errval {
  43                 const char *errstr;
  44                 int err;
  45         } ev[4] = {
  46                 { NULL,         0 },
  47                 { "invalid",    EINVAL },
  48                 { "too small",  ERANGE },
  49                 { "too large",  ERANGE },
  50         };
  51
  52         ev[0].err = errno;
  53         errno = 0;
  54         if (minval > maxval)
  55                 error = INVALID;
  56         else {
  57                 ll = strtoll(numstr, &ep, 10);
  58                 if (numstr == ep || *ep != '\0')
  59                         error = INVALID;
  60                 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
  61                         error = TOOSMALL;
  62                 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
  63                         error = TOOLARGE;
  64         }
  65         if (errstrp != NULL)
  66                 *errstrp = ev[error].errstr;
  67         errno = ev[error].err;
  68         if (error)
  69                 ll = 0;
  70
  71         return (ll);
  72 }