freebsd-dev/contrib/mandoc/compat_strtonum.c
Baptiste Daroussin 61d06d6bd1 Import mandoc 1.14.4
Approved by:	re (kib)
MFC after:	1 week
2018-09-20 10:58:52 +00:00

77 lines
1.9 KiB
C

#include "config.h"
#if HAVE_STRTONUM
int dummy;
#else
/* $Id: compat_strtonum.c,v 1.1 2015/02/16 14:56:22 schwarze Exp $ */
/* $OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $ */
/*
* Copyright (c) 2004 Ted Unangst and Todd Miller
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#define INVALID 1
#define TOOSMALL 2
#define TOOLARGE 3
long long
strtonum(const char *numstr, long long minval, long long maxval,
const char **errstrp)
{
long long ll = 0;
int error = 0;
char *ep;
struct errval {
const char *errstr;
int err;
} ev[4] = {
{ NULL, 0 },
{ "invalid", EINVAL },
{ "too small", ERANGE },
{ "too large", ERANGE },
};
ev[0].err = errno;
errno = 0;
if (minval > maxval) {
error = INVALID;
} else {
ll = strtoll(numstr, &ep, 10);
if (numstr == ep || *ep != '\0')
error = INVALID;
else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
error = TOOSMALL;
else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
error = TOOLARGE;
}
if (errstrp != NULL)
*errstrp = ev[error].errstr;
errno = ev[error].err;
if (error)
ll = 0;
return (ll);
}
#endif /* !HAVE_STRTONUM */