stdlib/FreeBSD/strtonum.c

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