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VILLASnode/common/lib/compat.cpp

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/* Compatability for different library versions.
*
* Author: Steffen Vogel <post@steffenvogel.de>
* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
* SPDX-License-Identifier: Apache-2.0
*/
#include <cstring>
#include <jansson.h>
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#include <unistd.h>
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#include <villas/compat.hpp>
#if JANSSON_VERSION_HEX < 0x020A00
size_t json_dumpb(const json_t *json, char *buffer, size_t size, size_t flags) {
char *str;
size_t len;
str = json_dumps(json, flags);
if (!str)
return 0;
len = strlen(str); // Not \0 terminated
if (buffer && len <= size)
memcpy(buffer, str, len);
free(str);
return len;
}
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static size_t json_loadfd_callback(void *buffer, size_t buflen, void *data) {
int *fd = (int *)data;
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return (size_t)read(*fd, buffer, buflen);
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}
json_t *json_loadfd(int input, size_t flags, json_error_t *error) {
return json_load_callback(json_loadfd_callback, (void *)&input, flags, error);
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}
static int json_dumpfd_callback(const char *buffer, size_t size, void *data) {
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#ifdef HAVE_UNISTD_H
int *dest = (int *)data;
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if (write(*dest, buffer, size) == (ssize_t)size)
return 0;
#else
(void)buffer;
(void)size;
(void)data;
#endif // HAVE_UNISTD_H
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return -1;
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}
int json_dumpfd(const json_t *json, int output, size_t flags) {
return json_dump_callback(json, json_dumpfd_callback, (void *)&output, flags);
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}
#endif // JANSSON_VERSION_HEX < 0x020A00