examples/vm_power_manager/parse.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation.
 * Copyright(c) 2014 6WIND S.A.
 */

#include <string.h>
#include <rte_log.h>
#include "parse.h"

/*
 * Parse elem, the elem could be single number/range or group
 * 1) A single number elem, it's just a simple digit. e.g. 9
 * 2) A single range elem, two digits with a '-' between. e.g. 2-6
 * 3) A group elem, combines multiple 1) or 2) e.g 0,2-4,6
 *    Within group, '-' used for a range separator;
 *                       ',' used for a single number.
 */
int
parse_set(const char *input, uint16_t set[], unsigned int num)
{
    unsigned int idx;
    const char *str = input;
    char *end = NULL;
    unsigned int min, max;

    memset(set, 0, num * sizeof(uint16_t));

    while (isblank(*str))
        str++;

    /* only digit or left bracket is qualify for start point */
    if (!isdigit(*str) || *str == '\0')
        return -1;

    while (isblank(*str))
        str++;
    if (*str == '\0')
        return -1;

    min = num;
    do {

        /* go ahead to the first digit */
        while (isblank(*str))
            str++;
        if (!isdigit(*str))
            return -1;

        /* get the digit value */
        errno = 0;
        idx = strtoul(str, &end, 10);
        if (errno || end == NULL || idx >= num)
            return -1;

        /* go ahead to separator '-' and ',' */
        while (isblank(*end))
            end++;
        if (*end == '-') {
            if (min == num)
                min = idx;
            else /* avoid continuous '-' */
                return -1;
        } else if ((*end == ',') || (*end == '\0')) {
            max = idx;

            if (min == num)
                min = idx;

            for (idx = RTE_MIN(min, max);
                    idx <= RTE_MAX(min, max); idx++) {
                set[idx] = 1;
            }
            min = num;
        } else
            return -1;

        str = end + 1;
    } while (*end != '\0');

    return str - input;
}