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contrib/mg/strtonum.c
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/* $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> | |||||
#include "config.h" | |||||
#ifndef HAVE_STRTONUM | |||||
#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 */ |