1c464d9a2d
- Set errno = 0 before the call. Otherwise, it may contain anything. - ERANGE is not the only possible errno value of these functions. They can also set it to EINVAL. - Any errno value after these calls is bad; just compare against 0. - Don't check for the return value; just errno. This function is guaranteed to not modify errno on success (POSIX). - Check endptr == str, which may or may not set EINVAL. Suggested-by: Iker Pedrosa <ipedrosa@redhat.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>
40 lines
746 B
C
40 lines
746 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 "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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* Returns 0 on failure, 1 on success.
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*/
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int getulong (const char *numstr, /*@out@*/unsigned long *result)
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{
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unsigned long val;
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char *endptr;
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errno = 0;
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val = strtoul(numstr, &endptr, 0);
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if ( ('\0' == *numstr)
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|| ('\0' != *endptr)
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|| (0 != errno)
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) {
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return 0;
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}
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*result = val;
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return 1;
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}
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