/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Helper functions to skip white spaces, find tokens, find separators and free
 * memory.
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "commp_util.h"


/*
 * Skip to the next non-whitespace
 */
int
commp_skip_white_space(const char **begin, const char *end)
{
        while (*begin < end) {
                if (!isspace(**begin))
                        return (0);
                (*begin)++;
        }
        return (1);
}

/*
 * Finds the token in the char buffer. *current will be pointing to the
 * token when function returns. If the char buffer has leading token,
 * it returns 1.
 */
int
commp_find_token(const char **begin, const char **current,  const char *end,
    char token, boolean_t last)
{
        *current = *begin;
        while (*current < end) {
                if (!last && (**current == token))
                        break;
                else if (isspace(**current))
                        return (1);
                (*current)++;
        }
        /* Checks for leading white space */
        if (*current == *begin)
                return (1);
        else
                return (0);
}

/*
 * atoi function
 */
int
commp_atoi(const char *begin, const char *end, int *num)
{
        boolean_t       num_found = B_FALSE;

        *num = 0;
        while (begin < end) {
                if (isdigit(*begin)) {
                        *num = (*num * 10) + (*begin - '0');
                        num_found = B_TRUE;
                        begin++;
                } else {
                        break;
                }
        }
        if (!num_found || (begin != end))
                return (EINVAL);
        return (0);
}

/*
 * Given a string converts it to unsigned long long int.
 */
int
commp_strtoull(const char *begin, const char *end, uint64_t *num)
{
        boolean_t       num_found = B_FALSE;

        *num = 0;
        while (begin < end) {
                if (isdigit(*begin)) {
                        *num = (*num * 10) + (*begin - '0');
                        num_found = B_TRUE;
                        begin++;
                } else {
                        break;
                }
        }
        if (!num_found || (begin != end))
                return (EINVAL);
        return (0);
}

/*
 * Given a string converts it to unsigned byte
 */
int
commp_strtoub(const char *begin, const char *end, uint8_t *num)
{
        boolean_t       num_found = B_FALSE;

        *num = 0;
        while (begin < end) {
                if (isdigit(*begin)) {
                        *num = (*num * 10) + (*begin - '0');
                        num_found = B_TRUE;
                        begin++;
                } else {
                        break;
                }
        }
        if (!num_found || (begin != end))
                return (EINVAL);
        return (0);
}

/*
 * Given a string converts it to unsigned int
 */
int
commp_atoui(const char *begin, const char *end, uint_t *num)
{
        boolean_t       num_found = B_FALSE;

        *num = 0;
        while (begin < end) {
                if (isdigit(*begin)) {
                        *num = (*num * 10) + (*begin - '0');
                        num_found = B_TRUE;
                        begin++;
                } else {
                        break;
                }
        }
        if (!num_found || (begin != end))
                return (EINVAL);
        return (0);
}

/*
 * allocates memory and copies string to new memory
 */
int
commp_add_str(char **dest, const char *src, int len)
{
        if (len == 0)
                return (EINVAL);
        (*dest) = calloc(1, len + 1);
        if (*dest == NULL)
                return (ENOMEM);
        (void) strncpy(*dest, src, len);
        return (0);
}

/*
 * This function converts strings like "5d" to equivalent time in secs.
 * For eg. 1h = 3600, 10d = 86400
 */
int
commp_time_to_secs(const char *begin, const char *end, uint64_t *num)
{
        uint_t          factor = 0;

        if (!isdigit(*(end - 1))) {
                switch (*(end - 1)) {
                        case 'd':
                                factor = COMMP_SECS_IN_DAY;
                                break;
                        case 'h':
                                factor = COMMP_SECS_IN_HOUR;
                                break;
                        case 'm':
                                factor = COMMP_SECS_IN_MIN;
                                break;
                        case 's':
                                factor = 1;
                                break;
                        default:
                                return (EINVAL);
                }
                --end;
        }
        if (commp_strtoull(begin, end, num) != 0)
                return (EINVAL);
        if (factor != 0)
                (*num) = (*num) * factor;
        return (0);
}