1/*	$OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $	*/
 2
 3/*
 4 * Copyright (c) 2004 Ted Unangst and Todd Miller
 5 * All rights reserved.
 6 *
 7 * Permission to use, copy, modify, and distribute this software for any
 8 * purpose with or without fee is hereby granted, provided that the above
 9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <errno.h>
21#include <limits.h>
22#include <stdlib.h>
23
24#include "../util.h"
25
26#define INVALID  1
27#define TOOSMALL 2
28#define TOOLARGE 3
29
30long long
31strtonum(const char *numstr, long long minval, long long maxval, const char **errstrp)
32{
33  long long ll    = 0;
34  int       error = 0;
35  char     *ep;
36  struct errval {
37    const char *errstr;
38    int         err;
39  } ev[4] = {
40      {NULL, 0},
41      {"invalid", EINVAL},
42      {"too small", ERANGE},
43      {"too large", ERANGE},
44  };
45
46  ev[0].err = errno;
47  errno     = 0;
48  if (minval > maxval) {
49    error = INVALID;
50  } else {
51    ll = strtoll(numstr, &ep, 10);
52    if (numstr == ep || *ep != '\0')
53      error = INVALID;
54    else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
55      error = TOOSMALL;
56    else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
57      error = TOOLARGE;
58  }
59  if (errstrp != NULL)
60    *errstrp = ev[error].errstr;
61  errno = ev[error].err;
62  if (error)
63    ll = 0;
64
65  return (ll);
66}
67
68long long
69enstrtonum(int status, const char *numstr, long long minval, long long maxval)
70{
71  const char *errstr;
72  long long   ll;
73
74  ll = strtonum(numstr, minval, maxval, &errstr);
75  if (errstr)
76    enprintf(status, "strtonum %s: %s\n", numstr, errstr);
77  return ll;
78}
79
80long long
81estrtonum(const char *numstr, long long minval, long long maxval)
82{
83  return enstrtonum(1, numstr, minval, maxval);
84}