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https://git.rwth-aachen.de/acs/public/villas/node/
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100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/** A simple growing buffer.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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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 3 of the License, or
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* 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, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <string.h>
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#include <villas/compat.h>
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#include <villas/buffer.h>
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#include <villas/common.h>
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int buffer_init(struct buffer *b, size_t size)
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{
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b->len = 0;
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b->size = size;
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b->buf = malloc(size);
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if (!b->buf)
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return -1;
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b->state = STATE_INITIALIZED;
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return 0;
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}
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int buffer_destroy(struct buffer *b)
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{
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if (b->buf)
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free(b->buf);
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b->state = STATE_DESTROYED;
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return 0;
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}
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void buffer_clear(struct buffer *b)
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{
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b->len = 0;
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}
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int buffer_append(struct buffer *b, const char *data, size_t len)
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{
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if (b->len + len > b->size) {
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b->size = b->len + len;
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b->buf = realloc(b->buf, b->size);
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if (!b->buf)
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return -1;
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}
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memcpy(b->buf + b->len, data, len);
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b->len += len;
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return 0;
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}
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int buffer_parse_json(struct buffer *b, json_t **j)
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{
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*j = json_loadb(b->buf, b->len, 0, NULL);
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if (!*j)
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return -1;
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return 0;
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}
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int buffer_append_json(struct buffer *b, json_t *j)
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{
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size_t len;
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retry: len = json_dumpb(j, b->buf + b->len, b->size - b->len, 0);
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if (b->size < b->len + len) {
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b->buf = realloc(b->buf, b->len + len);
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if (!b->buf)
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return -1;
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b->size = b->len + len;
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goto retry;
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}
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b->len += len;
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return 0;
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}
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