oxr_two_call.h

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// Copyright 2018-2019, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Two call helper functions.
 * @author Rylie Pavlik <rylie.pavlik@collabora.com>
 * @author Jakob Bornecrantz <jakob@collabora.com>
 * @ingroup oxr_main
 */
 
#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
#define OXR_TWO_CALL_HELPER(log, cnt_input, cnt_output, output, count, data, sval)                                     \
        do {                                                                                                           \
                if ((cnt_output) == NULL) {                                                                            \
                        return oxr_error(log, XR_ERROR_VALIDATION_FAILURE, #cnt_output);                               \
                }                                                                                                      \
                *(cnt_output) = (uint32_t)(count);                                                                     \
                                                                                                                       \
                if ((cnt_input) == 0) {                                                                                \
                        return sval;                                                                                   \
                }                                                                                                      \
                if ((cnt_input) < (uint32_t)(count)) {                                                                 \
                        return oxr_error(log, XR_ERROR_SIZE_INSUFFICIENT, #cnt_input);                                 \
                }                                                                                                      \
                for (uint32_t i = 0; i < (count); i++) {                                                               \
                        (output)[i] = (data)[i];                                                                       \
                }                                                                                                      \
                return (sval);                                                                                         \
        } while (false)
 
//! Calls fill_fn(&output_struct[i], &source_struct[i]) to fill output_structs
#define OXR_TWO_CALL_FILL_IN_HELPER(log, cnt_input, cnt_output, output_structs, count, fill_fn, source_structs, sval)  \
        do {                                                                                                           \
                if (cnt_output == NULL) {                                                                              \
                        return oxr_error(log, XR_ERROR_VALIDATION_FAILURE, #cnt_output);                               \
                }                                                                                                      \
                *cnt_output = count;                                                                                   \
                                                                                                                       \
                if (cnt_input == 0) {                                                                                  \
                        return sval;                                                                                   \
                }                                                                                                      \
                if (cnt_input < count) {                                                                               \
                        return oxr_error(log, XR_ERROR_SIZE_INSUFFICIENT, #cnt_input);                                 \
                }                                                                                                      \
                for (uint32_t i = 0; i < count; i++) {                                                                 \
                        fill_fn(&output_structs[i], &source_structs[i]);                                               \
                }                                                                                                      \
                return sval;                                                                                           \
        } while (false)
 
#ifdef __cplusplus
}
#endif