/*
 * 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 (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/param.h>
#include <libintl.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include <strings.h>
#include <sys/types.h>
#include <limits.h>
#include "utils.h"

static char PNAME_FMT[] = "%s: ";
static char ERRNO_FMT[] = ": %s\n";
static char EOL_FMT[] = "\n";

static char *pname;

char *
setpname(char *arg0)
{
        char *p = strrchr(arg0, '/');

        if (p == NULL)
                p = arg0;
        else
                p++;
        pname = p;
        return (pname);
}

/*PRINTFLIKE1*/
void
warn(const char *format, ...)
{
        int err = errno;
        va_list alist;
        if (pname != NULL)
                (void) fprintf(stderr, gettext(PNAME_FMT), pname);
        va_start(alist, format);
        (void) vfprintf(stderr, format, alist);
        va_end(alist);
        if (strchr(format, '\n') == NULL)
                if (err)
                        (void) fprintf(stderr,
                            gettext(ERRNO_FMT), strerror(err));
                else
                        (void) fprintf(stderr, gettext(EOL_FMT));


}

static char *__metric_modifiers[] = { "K", "M", "G", "T", "P", "E", NULL };
static uint64_t __metric_scales[] = {
    1000LLU,
    1000LLU * 1000,
    1000LLU * 1000 * 1000,
    1000LLU * 1000 * 1000 * 1000,
    1000LLU * 1000 * 1000 * 1000 * 1000,
    1000LLU * 1000 * 1000 * 1000 * 1000 * 1000
};
static scale_t __metric_scale = { __metric_modifiers, __metric_scales };

static char *__binary_modifiers[] = {"K", "M", "G", "T", "P", "E", NULL};
static uint64_t __binary_scales[] = {
    1024LLU,
    1024LLU * 1024,
    1024LLU * 1024 * 1024,
    1024LLU * 1024 * 1024 * 1024,
    1024LLU * 1024 * 1024 * 1024 * 1024,
    1024LLU * 1024 * 1024 * 1024 * 1024 * 1024
};
static scale_t __binary_scale = { __binary_modifiers, __binary_scales };

scale_t *scale_metric = &__metric_scale;
scale_t *scale_binary = &__binary_scale;

int
scaledtouint64(char *scaledin,
    uint64_t *uint64out,
    int *widthout, char **modifierout, char **unitout,
    scale_t *scale, char *unit, int flags) {

        double result;
        double value;
        int index = 0;
        uint64_t multiplier = 1;
        char string[SCALED_STRLEN];
        char *endptr;
        int cmp;
        int hasmodifier = 0;
        char **modifiers = scale->modifers;
        uint64_t *scales = scale->scales;

        if (modifierout)
                *modifierout = NULL;
        if (unitout)
                *unitout = NULL;

        /*
         * first check for hex value, which cannot be scaled, as
         * hex letters cannot be disserned from modifier or unit letters
         */
        if ((strncmp("0x", scaledin, 2) == 0) ||
            (strncmp("0X", scaledin, 2) == 0)) {

                /* unit cannot be required on hex values */
                if ((unit && *unit != '\0') &&
                    !(flags & SCALED_UNIT_OPTIONAL_FLAG))
                        return (SCALED_INVALID_UNIT);

                errno = 0;
                *uint64out = strtoull(scaledin, &endptr, 16);
                if (errno) {
                        if (errno == ERANGE)
                                return (SCALED_OVERFLOW);
                        else
                                return (SCALED_INVALID_NUMBER);
                }
                if (*endptr != '\0')
                        return (SCALED_INVALID_NUMBER);

                /* compute width of decimal equivalent */
                if (widthout) {
                        (void) snprintf(
                            string, SCALED_STRLEN, "%llu", *uint64out);
                        *widthout = strlen(string);
                }
                return (0);
        }

        /* scan out numeric value */
        errno = 0;
        value = strtod(scaledin, &endptr);
        if (errno) {
                if (errno == ERANGE)
                        return (SCALED_OVERFLOW);
                else
                        return (SCALED_INVALID_NUMBER);

        }
        if (endptr == scaledin)
                return (SCALED_INVALID_NUMBER);

        /* no negative values */
        if (strchr(scaledin, '-'))
                return (SCALED_INVALID_NUMBER);
        if (value < 0.0)
                return (SCALED_INVALID_NUMBER);


        /* compute width of number string */
        if (widthout)
                *widthout = (int)(endptr - scaledin);

        /* check possible modifier */
        if (*endptr != '\0') {
                index = 0;
                while (modifiers[index] != NULL) {
                        if (flags & SCALED_MODIFIER_CASE_INSENSITIVE_FLAG)
                                cmp = strncasecmp(modifiers[index], endptr,
                                    strlen(modifiers[index]));
                        else
                                cmp = strncmp(modifiers[index], endptr,
                                    strlen(modifiers[index]));

                        if (cmp == 0) {
                                if (modifierout)
                                        *modifierout = modifiers[index];
                                endptr += strlen(modifiers[index]);
                                multiplier = scales[index];
                                result = value * multiplier;
                                if (result > UINT64_MAX)
                                        return (SCALED_OVERFLOW);

                                *uint64out = (uint64_t)result;
                                hasmodifier = 1;
                                break;
                        }
                        index++;
                }
        }
        /* if there is no modifier, value must be an integer */
        if (!hasmodifier) {
                errno = 0;
                *uint64out = strtoull(scaledin, &endptr, 0);
                if (errno) {
                        if (errno == ERANGE)
                                return (SCALED_OVERFLOW);
                        else
                                return (SCALED_INVALID_NUMBER);
                }
                if (endptr == scaledin)
                        return (SCALED_INVALID_NUMBER);
        }

        /* if unit is present when no unit is allowed, fail */
        if ((unit == NULL || *unit == '\0') && (*endptr != '\0'))
                return (SCALED_INVALID_UNIT);

        /* check for missing unit when unit is required */
        if ((unit && *unit != '\0') &&
            !(flags & SCALED_UNIT_OPTIONAL_FLAG) &&
            (*endptr == '\0'))
                return (SCALED_INVALID_UNIT);

        /* validate unit */
        if (unit && *unit != '\0') {

                /* allow for missing unit if it is optional */
                if ((flags & SCALED_UNIT_OPTIONAL_FLAG) &&
                    (*endptr == '\0'))
                        return (0);

                if (flags & SCALED_UNIT_CASE_INSENSITIVE_FLAG)
                        cmp = strncasecmp(unit, endptr, strlen(unit));
                else
                        cmp = strncmp(unit, endptr, strlen(unit));

                if (cmp != 0)
                        return (SCALED_INVALID_UNIT);

                if (*(endptr + strlen(unit)) != '\0')
                        return (SCALED_INVALID_UNIT);

                if (unitout)
                        *unitout = unit;
        }
        return (0);
}


int
uint64toscaled(uint64_t uint64in, int widthin, char *maxmodifierin,
    char *scaledout, int *widthout, char **modifierout,
    scale_t *scale, char *unit, int flags) {

        int index = 0;
        int count;
        int width;
        int decimals = 0;
        char string[SCALED_STRLEN];
        double value;
        char **modifiers = scale->modifers;
        uint64_t *scales = scale->scales;

        /* don't scale if there is no reason to */
        if (uint64in < scales[0] || maxmodifierin == NULL) {
                if (flags & SCALED_PAD_WIDTH_FLAG)
                        width = widthin;
                else
                        width = 0;

                (void) snprintf(string, SCALED_STRLEN, "%%%dllu", width);
                /* LINTED */
                count = snprintf(scaledout, SCALED_STRLEN, string, uint64in);
                if (unit && *unit != '\0')
                        (void) strcat(scaledout, unit);

                if (widthout)
                        *widthout = count;

                if (modifierout)
                        *modifierout = NULL;

                return (0);
        }

        for (index = 0; modifiers[index + 1] != NULL; index++) {

                if (uint64in >= scales[index] &&
                    uint64in < scales[index + 1])
                        break;

                if ((strncmp(modifiers[index], maxmodifierin,
                    strlen(modifiers[index])) == 0) &&
                    (strlen(modifiers[index]) == strlen(maxmodifierin)))
                        break;

        }

        value = ((double)(uint64in)) / scales[index];
        if (modifierout)
                *modifierout = modifiers[index];

        count = snprintf(string, SCALED_STRLEN, "%0.0lf", value);
        while (count < widthin) {
                decimals++;
                (void) snprintf(string, SCALED_STRLEN, "%%0.%dlf", decimals);
                /* LINTED */
                count = snprintf(scaledout, SCALED_STRLEN, string, value);

                /* reduce decimal places if we've overshot the desired width */
                if (count > widthin) {
                        decimals--;
                        break;
                }
        }

        if (flags & SCALED_PAD_WIDTH_FLAG)
                width = widthin;
        else
                width = 0;

        (void) snprintf(string, SCALED_STRLEN, "%%%d.%dlf", width, decimals);
        /* LINTED */
        count = snprintf(scaledout, SCALED_STRLEN, string, value);

        (void) strcat(scaledout, modifiers[index]);

        if (unit && *unit != '\0')
                (void) strcat(scaledout, unit);

        if (widthout)
                *widthout = count;

        return (0);
}

int
scaledtoscaled(char *scaledin, int widthin, char *maxmodifierin,
    char *scaledout, int *widthout, char **modifierout,
    scale_t *scale, char *unit, int flags) {

        int ret;
        uint64_t val;

        ret = scaledtouint64(scaledin, &val, NULL, NULL, NULL,
            scale, unit, flags);
        if (ret)
                return (ret);

        ret = uint64toscaled(val, widthin, maxmodifierin,
            scaledout, widthout, modifierout,
            scale, unit, flags);

        return (ret);
}

int
scaledeqscaled(char *scaled1, char *scaled2,
    scale_t *scale, char *unit, int flags) {

        int ret;
        uint64_t uint64;
        char *modifier1;
        char *modifier2;
        char *modifier = NULL;
        int i;
        int width;
        int width1;
        int width2;
        char scaledA[SCALED_STRLEN];
        char scaledB[SCALED_STRLEN];
        char **modifiers = scale->modifers;

        /*
         * remove padding flag, so strings to compare will not have
         * whitespace
         */
        flags = flags & (~SCALED_PAD_WIDTH_FLAG);

        /* determine each number's width and modifier */
        ret = scaledtouint64(scaled1, &uint64, &width1, &modifier1, NULL,
            scale, unit, flags);
        if (ret)
                return (0);

        ret = scaledtouint64(scaled2, &uint64, &width2, &modifier2, NULL,
            scale, unit, flags);
        if (ret)
                return (0);

        /*
         * determine the width and modifier to use for comparison.
         * Use widest width and smallest modifier.
         * Rescale to new width and modifier
         */

        if (modifier1 == NULL || modifier2 == NULL)
                modifier = NULL;
        else {
                for (i = 0; modifiers[i] != NULL; i++) {

                        if (strcmp(modifier1, modifiers[i]) == 0) {
                                modifier = modifiers[i];
                                break;
                        }
                        if (strcmp(modifier2, modifiers[i]) == 0) {
                                modifier = modifiers[i];
                                break;
                        }
                }
        }
        width = 0;
        if (width1 > width)
                width = width1;
        if (width2 > width)
                width = width2;

        /*
         * Convert first number to width and modifier.
         * This is done for the following reasons:
         *      1. In case first number is hecadecimal.  This will convert
         *         it to decimal
         *      2. In case the first number has < the minimum number of
         *         columns.
         *      3. The first number is missing an optional unit string.
         *      4. Fix casing of modifier and unit.
         */

        ret = scaledtoscaled(scaled1, width, modifier,
            scaledA, NULL, NULL, scale, unit, flags);
        if (ret)
                return (0);

        /* convert second number to width and modifier matching first number */
        ret = scaledtoscaled(scaled2, width, modifier,
            scaledB, NULL, NULL, scale, unit, flags);
        if (ret)
                return (0);

        /* numbers are equal if strings match */
        return ((strncmp(scaledA, scaledB, strlen(scaledA)) == 0) &&
            (strlen(scaledA) == strlen(scaledB)));

}

int
scaledequint64(char *scaled, uint64_t uint64, int minwidth,
    scale_t *scale, char *unit, int flags) {

        int ret;
        uint64_t tmpuint64;
        char *modifier;
        int width;

        char scaledA[SCALED_STRLEN];
        char scaledB[SCALED_STRLEN];

        /* determine for number's width and modifier */
        ret = scaledtouint64(scaled, &tmpuint64, &width, &modifier, NULL,
            scale, unit, flags);
        if (ret)
                return (0);

        if (width < minwidth)
                width = minwidth;

        /*
         * Convert first number to width and modifier.
         * This is done for the following reasons:
         *      1. In case first number is hecadecimal.  This will convert
         *         it to decimal
         *      2. In case the first number has < the minimum number of
         *         columns.
         *      3. The first number is missing an optional unit string.
         *      4. Fix casing of modifier and unit.
         */

        ret = scaledtoscaled(scaled, width, modifier,
            scaledA, NULL, NULL, scale, unit, flags);
        if (ret)
                return (0);

        /* convert second number to width and modifier matching first number */
        ret = uint64toscaled(uint64, width, modifier,
            scaledB, NULL, NULL, scale, unit, flags);
        if (ret)
                return (0);

        /* numbers are equal if strings match */
        return ((strncmp(scaledA, scaledB, strlen(scaledA)) == 0) &&
            (strlen(scaledA) == strlen(scaledB)));
}