/*      $NetBSD: sortinfo.c,v 1.6 2017/04/30 13:45:06 abhinav Exp $     */

/*-
 * Copyright (c) 2015 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
__RCSID("$NetBSD: sortinfo.c,v 1.6 2017/04/30 13:45:06 abhinav Exp $");

/*
 * Sort a texinfo(1) directory file.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <util.h>

struct section {
        const char *name;
        char **lines;
        size_t nlines;
        size_t maxlines;
};

static struct section *slist;
static size_t nsections, maxsections;

static struct section *
addsection(char *line)
{
        if (nsections >= maxsections) {
                maxsections += 20;
                slist = erealloc(slist, maxsections * sizeof(*slist));
        }
        slist[nsections].name = line;
        slist[nsections].nlines = 0;
        slist[nsections].maxlines = 20;
        slist[nsections].lines = ecalloc(slist[nsections].maxlines,
            sizeof(*slist[nsections].lines));
        return &slist[nsections++];
}

static void
addline(struct section *s, char *line)
{
        if (s->nlines == s->maxlines) {
                s->maxlines += 20;
                s->lines = erealloc(s->lines, s->maxlines * sizeof(*s->lines));
        }
        s->lines[s->nlines++] = line;
}

static int
compsection(const void *a, const void *b)
{
        const struct section *sa = a, *sb = b;
        return strcmp(sa->name, sb->name);
}

static int
strptrcmp(const void *a, const void *b)
{
        const char *sa = *(const char * const *)a;
        const char *sb = *(const char * const *)b;
        return strcmp(sa, sb);
}

static void
printsection(const struct section *s)
{
        size_t i;

        fputc('\n', stdout);
        printf("%s", s->name);
        for (i = 0; i < s->nlines; i++)
                printf("%s", s->lines[i]);
}
        
int
main(int argc, char *argv[])
{
        size_t i;
        ssize_t ll;
        char *line;
        int needsection;
        struct section *s;

        s = NULL;
        line = NULL;
        i = 0;

        while ((ll = getline(&line, &i, stdin)) != -1) {
                fputs(line, stdout);
                if (strcmp(line, "* Menu:\n") == 0)
                        break;
        }

        if (ll == -1)
                errx(EXIT_FAILURE, "Did not find menu line");

        needsection = 0;
        while ((ll = getline(&line, &i, stdin)) != -1)
                switch (*line) {
                case '\n':
                        needsection = 1;
                        continue;
                case '*':
                        if (s == NULL)
                                errx(EXIT_FAILURE, "No current section");
                        addline(s, line);
                        line = NULL;
                        i = 0;
                        continue;
                default:
                        if (needsection == 0)
                                errx(EXIT_FAILURE, "Already in section");
                        s = addsection(line);
                        line = NULL;
                        i = 0;
                        needsection = 0;
                        continue;
                }

        free(line);
        qsort(slist, nsections, sizeof(*slist), compsection);
        for (i = 0; i < nsections; i++) {
                s = &slist[i];
                qsort(s->lines, s->nlines, sizeof(*s->lines), strptrcmp);
                printsection(&slist[i]);
        }

        return EXIT_SUCCESS;
}