/*
 *  Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *  Copyright (C) 2008-2013 Sourcefire, Inc.
 *
 *  Authors: Török Edvin
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA 02110-1301, USA.
 */
#ifndef TEXTBUF_H
#define TEXTBUF_H

struct text_buffer {
    char *data;
    size_t pos;
    size_t capacity;
};

static inline int textbuffer_ensure_capacity(struct text_buffer *txtbuf, size_t len)
{
    if (txtbuf->pos + len > txtbuf->capacity) {
        char *d;
        unsigned capacity = MAX(txtbuf->pos + len, txtbuf->capacity + 4096);
        d                 = cli_realloc(txtbuf->data, capacity);
        if (!d)
            return -1;
        txtbuf->capacity = capacity;
        txtbuf->data     = d;
    }
    return 0;
}

static inline int textbuffer_append_len(struct text_buffer *txtbuf, const char *s, size_t len)
{
    if (textbuffer_ensure_capacity(txtbuf, len) == -1)
        return -1;
    memcpy(&txtbuf->data[txtbuf->pos], s, len);
    txtbuf->pos += len;
    return 0;
}

static inline int textbuffer_append(struct text_buffer *txtbuf, const char *s)
{
    size_t len = strlen(s);
    return textbuffer_append_len(txtbuf, s, len);
}

static inline int textbuffer_putc(struct text_buffer *txtbuf, const char c)
{
    if (textbuffer_ensure_capacity(txtbuf, 1) == -1)
        return -1;
    txtbuf->data[txtbuf->pos++] = c;
    return 0;
}

#endif