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buf.c

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/* GtkSQL -- an interactive graphical query tool for PostgreSQL
 * Copyright (C) 2002-2003 Darryl Luff
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#include <stdlib.h>
#include <string.h>
#include "buf.h"

#define MINSIZE 10

int allocsize(int n) {
    if (n < MINSIZE)
        return MINSIZE;
    else
        return n;
}

ABuf *buf_new(unsigned int len)
{
    ABuf *b = calloc(1, sizeof(ABuf));
    if (b) {
        b->b_len = allocsize(len);
        b->b_dat = calloc(1, b->b_len);
    }
    return b;
}

ABuf *buf_free(ABuf * buf)
{
    if (buf) {
        if (buf->b_dat)
            free(buf->b_dat);

        free(buf);
    }
    return NULL;
}

ABuf *buf_check(ABuf * buf, unsigned int len)
{
    if (!buf)
        return buf_new(len);

    if (buf->b_len < len) {
        ABuf *b = buf_new(len);
        memmove(b->b_dat, buf->b_dat, buf->b_len);
        buf_free(buf);
        return b;
    }
    return buf;
}

ABuf *buf_strcat(ABuf * buf, char *s)
{
    ABuf *b = NULL;
    if (! buf)
        b = buf_new(strlen(s)+1);
    else
        b = buf_check(buf, strlen(buf->b_dat) + strlen(s) + 1);

    if (b) {
        strncat(b->b_dat, s, b->b_len);
        b = buf_terminate(b);
    }

    return b;
}

ABuf *buf_strcpy(ABuf * buf, char *s)
{
    ABuf *b = NULL;
    int len;

    if (! s)
        return buf;

    len = strlen(s) + 1;
    if (! buf)
        b = buf_new(len);
    else
        b = buf_check(buf, len);

    if ((b) && (b->b_dat)) {
        if ((s) && (strlen(s) > 0)) {
            strncpy(b->b_dat, s, b->b_len);
            buf_terminate(b);
        }
        else
            *(b->b_dat) = '\0';
    }
    return b;
}

ABuf *buf_str_shrinkbyone(ABuf * buf) {
    if ((buf == NULL) || (buf->b_dat == NULL) || (strlen(buf->b_dat) < 1))
        return buf;

    buf->b_dat[strlen(buf->b_dat)-1] = '\0';
    return buf;
}

ABuf *buf_terminate(ABuf * buf)
{
    if (buf) {
        if ((buf->b_dat) && (buf->b_len)) {
            buf->b_dat[buf->b_len - 1] = '\0';
        }
    }
    return buf;
}

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