pw/strtounum.c

   1 /*-
   2  * Copyright (C) Baptiste Daroussin <bapt@FreeBSD.org>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 #include <errno.h>
  30 #include <inttypes.h>
  31 #include <limits.h>
  32 #include <stdlib.h>
  33
  34 #include "pw.h"
  35
  36 #define INVALID         "invalid"
  37 #define TOOSMALL        "too small"
  38 #define TOOLARGE        "too large"
  39
  40 uintmax_t
  41 strtounum(const char *numstr, uintmax_t minval, uintmax_t maxval,
  42     const char **errstrp)
  43 {
  44         uintmax_t ret = 0;
  45         char *ep;
  46
  47         if (minval > maxval) {
  48                 errno = EINVAL;
  49                 if (errstrp != NULL)
  50                         *errstrp = INVALID;
  51                 return (0);
  52         }
  53
  54         ret = strtoumax(numstr, &ep, 10);
  55         if (errno == EINVAL || numstr == ep || *ep != '\0') {
  56                 errno = EINVAL;
  57                 if (errstrp != NULL)
  58                         *errstrp = INVALID;
  59                 return (0);
  60         } else if ((ret == 0 && errno == ERANGE) || ret < minval) {
  61                 errno = ERANGE;
  62                 if (errstrp != NULL)
  63                         *errstrp = TOOSMALL;
  64                 return (0);
  65         } else if ((ret == UINTMAX_MAX && errno == ERANGE) || ret > maxval) {
  66                 errno = ERANGE;
  67                 if (errstrp != NULL)
  68                         *errstrp = TOOLARGE;
  69                 return (0);
  70         }
  71
  72         return (ret);
  73 }