66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
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/* $OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther Exp $ */
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/*
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* Copyright (c) 2004 Ted Unangst and Todd Miller
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#define INVALID 1
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#define TOOSMALL 2
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#define TOOLARGE 3
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long long
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strtonum(const char *numstr, long long minval, long long maxval,
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const char **errstrp)
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{
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long long ll = 0;
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int error = 0;
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char *ep;
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struct errval {
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const char *errstr;
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int err;
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} ev[4] = {
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{ NULL, 0 },
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{ "invalid", EINVAL },
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{ "too small", ERANGE },
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{ "too large", ERANGE },
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};
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ev[0].err = errno;
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errno = 0;
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if (minval > maxval) {
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error = INVALID;
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} else {
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ll = strtoll(numstr, &ep, 10);
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if (numstr == ep || *ep != '\0')
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error = INVALID;
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else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
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error = TOOSMALL;
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else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
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error = TOOLARGE;
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}
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if (errstrp != NULL)
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*errstrp = ev[error].errstr;
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errno = ev[error].err;
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if (error)
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ll = 0;
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return (ll);
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}
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