5220e42038
lifting a portion of the strbuf api/implementation found in archived. This will serve as a base for an generic buffer api.
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/* strbuf.c
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*
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* Copyright (C) 2010-2011 Henrik Hautakoski <henrik@fiktivkod.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "error.h"
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#include "strbuf.h"
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#define CHNK_SIZE 128
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char strbuf_null = '\0';
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void strbuf_init(strbuf_t *s) {
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s->buf = &strbuf_null;
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s->size = s->len = 0;
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}
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void strbuf_expand(strbuf_t *s, size_t len) {
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if (s->len + len + 1 < s->size)
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return;
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if (!s->size)
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s->buf = NULL;
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do
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s->size += CHNK_SIZE;
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while(s->len + len + 1 > s->size);
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s->buf = realloc(s->buf, s->size);
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}
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char* strbuf_release(strbuf_t *s) {
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char *ret;
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if (!s->size)
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ret = malloc(1);
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else if (s->len + 1 != s->size)
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ret = realloc(s->buf, s->len + 1);
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else
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ret = s->buf;
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strbuf_init(s);
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return ret;
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}
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void strbuf_free(strbuf_t *s) {
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if (!s->size)
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return;
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free(s->buf);
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strbuf_init(s);
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}
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void strbuf_attach(strbuf_t *s, void *buf, size_t len, size_t size) {
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strbuf_free(s);
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s->buf = buf;
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s->len = len;
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s->size = size;
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strbuf_expand(s, 0);
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s->buf[s->len] = '\0';
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}
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void strbuf_append(strbuf_t *s, const void *ptr, size_t len) {
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strbuf_expand(s, len);
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memcpy(s->buf + s->len, ptr, len);
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strbuf_setlen(s, s->len + len);
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}
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