// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
 * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
 */

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

#include <hash.h>
#include <hashtable.h>
#include <xalloc.h>
#include "lkc.h"

/* hash table of all parsed Kconfig files */
static HASHTABLE_DEFINE(file_hashtable, 1U << 11);

struct file {
        struct hlist_node node;
        struct {
                const char *name;
                int lineno;
        } parent;
        char name[];
};

static void die_duplicated_include(struct file *file,
                                   const char *parent, int lineno)
{
        fprintf(stderr,
                "%s:%d: error: repeated inclusion of %s\n"
                "%s:%d: note: location of first inclusion of %s\n",
                parent, lineno, file->name,
                file->parent.name, file->parent.lineno, file->name);
        exit(1);
}

/* file already present in list? If not add it */
const char *file_lookup(const char *name,
                        const char *parent_name, int parent_lineno)
{
        const char *parent = NULL;
        struct file *file;
        size_t len;
        int hash = hash_str(name);

        if (parent_name)
                parent = file_lookup(parent_name, NULL, 0);

        hash_for_each_possible(file_hashtable, file, node, hash)
                if (!strcmp(name, file->name)) {
                        if (!parent_name)
                                return file->name;
                        die_duplicated_include(file, parent, parent_lineno);
                }

        len = strlen(name);
        file = xmalloc(sizeof(*file) + len + 1);
        memset(file, 0, sizeof(*file));
        memcpy(file->name, name, len);
        file->name[len] = '\0';
        file->parent.name = parent;
        file->parent.lineno = parent_lineno;

        hash_add(file_hashtable, &file->node, hash);

        str_printf(&autoconf_cmd, "\t%s \\\n", name);

        return file->name;
}

/* Allocate initial growable string */
struct gstr str_new(void)
{
        struct gstr gs;
        gs.s = xmalloc(sizeof(char) * 64);
        gs.len = 64;
        gs.max_width = 0;
        strcpy(gs.s, "\0");
        return gs;
}

/* Free storage for growable string */
void str_free(struct gstr *gs)
{
        free(gs->s);
        gs->s = NULL;
        gs->len = 0;
}

/* Append to growable string */
void str_append(struct gstr *gs, const char *s)
{
        size_t l;
        if (s) {
                l = strlen(gs->s) + strlen(s) + 1;
                if (l > gs->len) {
                        gs->s = xrealloc(gs->s, l);
                        gs->len = l;
                }
                strcat(gs->s, s);
        }
}

/* Append printf formatted string to growable string */
void str_printf(struct gstr *gs, const char *fmt, ...)
{
        va_list ap;
        char s[10000]; /* big enough... */
        va_start(ap, fmt);
        vsnprintf(s, sizeof(s), fmt, ap);
        str_append(gs, s);
        va_end(ap);
}

/* Retrieve value of growable string */
char *str_get(const struct gstr *gs)
{
        return gs->s;
}