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65 lines
1.7 KiB
65 lines
1.7 KiB
/* $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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