/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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) 1997-1999 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * util.c -- low-level utilities used by map*.c
 */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include "xlator.h"
#include "util.h"
#include "errlog.h"

/*
 * String tables -- WARNING!  This uses realloc to recreate tables,
 *      so always assign table_t * return value to the current
 *      table pointer, lest the table address change in the
 *      called function.
 */
static char *strset(char *, char *);

table_t *
create_stringtable(int size)
{
        table_t *t;

        /* Solaris idiom: malloc && memset. TBD. */
        if ((t = calloc((size_t)1, (size_t)(sizeof (table_t) +
            ((sizeof (char *)) * size)))) == NULL) {
                errlog(FATAL,
                    "\nOut of memory.\n"
                    "We wish to hold the whole sky,\n"
                    "But we never will.\n");
        }
        t->nelem = size;
        t->used = -1;
        return (t);
}


table_t *
add_to_stringtable(table_t *t, char *value)
{
        table_t *t2;

        int i;

        if (t == NULL) {
                seterrline(__LINE__, __FILE__, NULL, NULL);
                errlog(FATAL|PROGRAM, "programmer error: tried to add to "
                        "a NULL table");
        }
        if (in_stringtable(t, value)) {
                return (t);
        }
        ++t->used;
        if (t->used >= t->nelem) {
                if ((t2 = realloc(t, (size_t)(sizeof (table_t) +
                    ((sizeof (char *)) * (t->nelem + TABLE_INCREMENT)))))
                    == NULL) {
                        print_stringtable(t);
                        seterrline(__LINE__, __FILE__, NULL, NULL);
                        errlog(FATAL|PROGRAM, "out of memory extending a "
                                "string table");
                }
                t = t2;
                t->nelem += TABLE_INCREMENT;
                for (i = t->used; i < t->nelem; ++i) {
                        t->elements[i] = NULL;
                }
        }
        t->elements[t->used] = strset(t->elements[t->used], value);
        return (t);
}

/*
 * free_stringtable -- really only mark it empty for reuse.
 */
table_t *
free_stringtable(table_t *t)
{

        if (t != NULL) {
                t->used = -1;
        }
        return (t);
}


char *
get_stringtable(table_t *t, int index)
{

        if (t == NULL) {
                return (NULL);
        } else if (index > t->used) {
                return (NULL);
        } else {
                return (t->elements[index]);
        }
}

int
in_stringtable(table_t *t, const char *value)
{
        int i;

        if (t == NULL) {
                return (0);
        }
        for (i = 0; i <= t->used; ++i) {
                if (strcmp(value, t->elements[i]) == 0)
                        return (1);
        }
        return (0);
}


void
print_stringtable(table_t *t)
{
        int i;

        if (t == NULL)
                return;

        errlog(VERBOSE,
                "table size = %d elements out of %d elements/%d bytes\n",
                t->used + 1, t->nelem,
                sizeof (table_t) + (sizeof (char *) * t->nelem));

        for (i = 0; i <= t->used; ++i) {
                (void) fprintf(stderr, "\t%s\n",
                        get_stringtable(t, i));
        }
}

static int
compare(const void *p, const void *q)
{
        return (strcmp((char *)p, (char *)q));
}

void
sort_stringtable(table_t *t)
{

        if (t && t->used > 0) {
                qsort((char *)t->elements, (size_t)t->used,
                        sizeof (char *), compare);
        }
}


/*
 * strset -- update a dynamically-allocated string or die trying.
 */
/*ARGSUSED*/
static char *
strset(char *string, char *value)
{
        size_t vlen;

        assert(value != NULL, "passed a null value to strset");
        vlen = strlen(value);
        if (string == NULL) {
                /* It was never allocated, so allocate it. */
                if ((string = malloc(vlen + 1)) == NULL) {
                        seterrline(__LINE__, __FILE__, NULL, NULL);
                        errlog(FATAL|PROGRAM, "out of memory allocating a "
                            "string");
                }
        } else if (strlen(string) < vlen) {
                /* Reallocate bigger. */
                if ((string = realloc(string, vlen + 1)) == NULL) {
                        seterrline(__LINE__, __FILE__, NULL, NULL);
                        errlog(FATAL|PROGRAM, "out of memory reallocating"
                            "a string");
                }
        }
        (void) strcpy(string, value);
        return (string);
}