discord-request.h

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#ifndef DISCORD_REQUEST_H
#define DISCORD_REQUEST_H
 
/* helper typedefs for casting */
typedef void (*cast_done_typed)(struct discord *,
                                struct discord_response *,
                                const void *);
typedef void (*cast_init)(void *);
typedef void (*cast_cleanup)(void *);
typedef size_t (*cast_from_json)(const char *, size_t, void *);
 
/* helper typedef for getting sizeof of `struct discord_ret` common fields */
typedef struct {
    DISCORD_RET_DEFAULT_FIELDS;
} discord_ret_default_fields;
 
#define _RET_COPY_TYPED(dest, src)                                            \
    do {                                                                      \
        memcpy(&(dest), &(src), sizeof(discord_ret_default_fields));          \
        (dest).has_type = true;                                               \
        (dest).done.typed = (cast_done_typed)(src).done;                      \
        (dest).sync = (src).sync;                                             \
    } while (0)
 
#define _RET_COPY_TYPELESS(dest, src)                                         \
    do {                                                                      \
        memcpy(&(dest), &(src), sizeof(discord_ret_default_fields));          \
        (dest).has_type = false;                                              \
        (dest).done.typeless = (src).done;                                    \
        (dest).sync = (void *)(src).sync;                                     \
    } while (0)
 
#define DISCORD_ATTR_INIT(attr, type, ret, _reason)                           \
    do {                                                                      \
        (attr).response.size = sizeof(struct type);                           \
        (attr).response.init = (cast_init)type##_init;                        \
        (attr).response.from_json = (cast_from_json)type##_from_json;         \
        (attr).response.cleanup = (cast_cleanup)type##_cleanup;               \
        (attr).reason = _reason;                                              \
        if (ret) _RET_COPY_TYPED(attr.dispatch, *ret);                        \
    } while (0)
 
#define DISCORD_ATTR_LIST_INIT(attr, type, ret, _reason)                      \
    do {                                                                      \
        (attr).response.size = sizeof(struct type);                           \
        (attr).response.from_json = (cast_from_json)type##_from_json;         \
        (attr).response.cleanup = (cast_cleanup)type##_cleanup;               \
        (attr).reason = _reason;                                              \
        if (ret) _RET_COPY_TYPED(attr.dispatch, *ret);                        \
    } while (0)
 
#define DISCORD_ATTR_BLANK_INIT(attr, ret, _reason)                           \
    do {                                                                      \
        (attr).reason = _reason;                                              \
        if (ret) _RET_COPY_TYPELESS(attr.dispatch, *ret);                     \
    } while (0)
 
#define DISCORD_ATTACHMENTS_IDS_INIT(attchs)                                  \
    do {                                                                      \
        for (int i = 0; i < attchs->size; ++i) {                              \
            attchs->array[i].id = (u64snowflake)i;                            \
        }                                                                     \
    } while (0)
 
#endif /* DISCORD_REQUEST_H */