f14670ee1a
strtou[l]l(3) silently converts negative numbers into positive. This behavior is wrong: a negative value should be parsed as a negative value, which would underflow unsigned (long) long, and so would return the smallest possible value, 0, and set errno to ERANGE to report an error. Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com> Cc: "Serge E. Hallyn" <serge@hallyn.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>
38 lines
736 B
C
38 lines
736 B
C
/*
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* SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id: getlong.c 2763 2009-04-23 09:57:03Z nekral-guest $"
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#include <stdlib.h>
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#include <errno.h>
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#include "atoi/strtou_noneg.h"
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#include "prototypes.h"
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/*
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* getulong - extract an unsigned long integer provided by the numstr string in *result
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*
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* It supports decimal, hexadecimal or octal representations.
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*/
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int
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getulong(const char *restrict numstr, unsigned long *restrict result)
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{
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char *endptr;
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unsigned long val;
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errno = 0;
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val = strtoul_noneg(numstr, &endptr, 0);
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if (('\0' == *numstr) || ('\0' != *endptr) || (0 != errno))
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return -1;
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*result = val;
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return 0;
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}
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