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>
102 lines
1.9 KiB
C
102 lines
1.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2008 , 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: $"
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#include <ctype.h>
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#include <stdlib.h>
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#include "defines.h"
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#include "prototypes.h"
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/*
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* Parse a range and indicate if the range is valid.
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* Valid ranges are in the form:
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* <long> -> min=max=long has_min has_max
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* -<long> -> max=long !has_min has_max
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* <long>- -> min=long has_min !has_max
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* <long1>-<long2> -> min=long1 max=long2 has_min has_max
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*
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* If the range is valid, getrange returns 1.
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* If the range is not valid, getrange returns 0.
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*/
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int getrange (const char *range,
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unsigned long *min, bool *has_min,
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unsigned long *max, bool *has_max)
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{
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char *endptr;
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unsigned long n;
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if (NULL == range) {
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return 0;
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}
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if ('-' == range[0]) {
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if (!isdigit(range[1])) {
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/* invalid */
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return 0;
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}
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errno = 0;
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n = strtoul(&range[1], &endptr, 10);
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if (('\0' != *endptr) || (0 != errno)) {
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/* invalid */
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return 0;
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}
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/* -<long> */
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*has_min = false;
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*has_max = true;
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*max = n;
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} else {
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errno = 0;
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n = strtoul(range, &endptr, 10);
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if (endptr == range || 0 != errno) {
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/* invalid */
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return 0;
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}
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switch (*endptr) {
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case '\0':
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/* <long> */
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*has_min = true;
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*has_max = true;
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*min = n;
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*max = n;
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break;
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case '-':
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endptr++;
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if ('\0' == *endptr) {
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/* <long>- */
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*has_min = true;
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*has_max = false;
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*min = n;
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} else if (!isdigit (*endptr)) {
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/* invalid */
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return 0;
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} else {
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*has_min = true;
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*min = n;
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errno = 0;
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n = strtoul(endptr, &endptr, 10);
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if ( ('\0' != *endptr)
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|| (0 != errno)) {
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/* invalid */
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return 0;
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}
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/* <long>-<long> */
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*has_max = true;
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*max = n;
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}
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break;
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default:
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return 0;
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}
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}
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return 1;
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}
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