pw/strtounum.c

   1 /*-
   2  * Copyright (C) 2015 Baptiste Daroussin <bapt@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <errno.h>
  31 #include <inttypes.h>
  32 #include <limits.h>
  33 #include <stdlib.h>
  34
  35 #include "pw.h"
  36
  37 uintmax_t
  38 strtounum(const char * __restrict np, uintmax_t minval, uintmax_t maxval,
  39     const char ** __restrict errpp)
  40 {
  41         char *endp;
  42         uintmax_t ret;
  43
  44         *errpp = NULL;
  45         if (minval > maxval) {
  46                 errno = EINVAL;
  47                 if (errpp != NULL)
  48                         *errpp = "invalid";
  49                 return (0);
  50         }
  51         errno = 0;
  52         ret = strtoumax(np, &endp, 10);
  53         if (endp == np || *endp != '\0') {
  54                 errno = EINVAL;
  55                 if (errpp != NULL)
  56                         *errpp = "invalid";
  57                 return (0);
  58         }
  59         if (ret < minval) {
  60                 errno = ERANGE;
  61                 if (errpp != NULL)
  62                         *errpp = "too small";
  63                 return (0);
  64         }
  65         if (errno == ERANGE || ret > maxval) {
  66                 errno = ERANGE;
  67                 if (errpp != NULL)
  68                         *errpp = "too large";
  69                 return (0);
  70         }
  71         return (ret);
  72 }