compat_strtonum.c

   1 #include "config.h"
   2
   3 #if HAVE_STRTONUM
   4
   5 int dummy;
   6
   7 #else
   8
   9 /*      $Id: compat_strtonum.c,v 1.1 2015/02/16 14:56:22 schwarze Exp $ */
  10 /*      $OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $       */
  11
  12 /*
  13  * Copyright (c) 2004 Ted Unangst and Todd Miller
  14  * All rights reserved.
  15  *
  16  * Permission to use, copy, modify, and distribute this software for any
  17  * purpose with or without fee is hereby granted, provided that the above
  18  * copyright notice and this permission notice appear in all copies.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  21  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  22  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  23  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  24  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  25  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  26  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  27  */
  28
  29 #include <errno.h>
  30 #include <limits.h>
  31 #include <stdlib.h>
  32
  33 #define INVALID         1
  34 #define TOOSMALL        2
  35 #define TOOLARGE        3
  36
  37 long long
  38 strtonum(const char *numstr, long long minval, long long maxval,
  39     const char **errstrp)
  40 {
  41         long long ll = 0;
  42         int error = 0;
  43         char *ep;
  44         struct errval {
  45                 const char *errstr;
  46                 int err;
  47         } ev[4] = {
  48                 { NULL,         0 },
  49                 { "invalid",    EINVAL },
  50                 { "too small",  ERANGE },
  51                 { "too large",  ERANGE },
  52         };
  53
  54         ev[0].err = errno;
  55         errno = 0;
  56         if (minval > maxval) {
  57                 error = INVALID;
  58         } else {
  59                 ll = strtoll(numstr, &ep, 10);
  60                 if (numstr == ep || *ep != '\0')
  61                         error = INVALID;
  62                 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
  63                         error = TOOSMALL;
  64                 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
  65                         error = TOOLARGE;
  66         }
  67         if (errstrp != NULL)
  68                 *errstrp = ev[error].errstr;
  69         errno = ev[error].err;
  70         if (error)
  71                 ll = 0;
  72
  73         return (ll);
  74 }
  75
  76 #endif /* !HAVE_STRTONUM */