#include <string.h>
#define KWIL_GEN_IMPL(...)\
int struct_A_to_json(struct struct_A* src, char** out_json) {\
    int json_capacity = 2; \
    /* length of b */\
    json_capacity += 5+ snprintf(NULL, 0, "%d", src->b);\
    /* length of a */\
    json_capacity += 5 + snprintf(NULL, 0, "%f", src->a);\
    /* length of u */\
    json_capacity += 5 + snprintf(NULL, 0, "%du", src->u);\
    /* length of dyn_str */\
    json_capacity += 11 + strlen(src->dyn_str);\
    char* json = malloc(json_capacity);\
    int json_len = 1;\
    strcpy(json, "{");\
    *out_json = json;\
    /* field: b */\
    json_len += sprintf(json + json_len, "\"b\":");\
    json_len += sprintf(json + json_len, "%d", src->b);\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: a */\
    json_len += sprintf(json + json_len, "\"a\":");\
    json_len += sprintf(json + json_len, "%f", src->a);\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: u */\
    json_len += sprintf(json + json_len, "\"u\":");\
    json_len += sprintf(json + json_len, "%u", src->u);\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: dyn_str */\
    json_len += sprintf(json + json_len, "\"dyn_str\":");\
    if(src->dyn_str != NULL) {\
        json_len += sprintf(json + json_len, "\"%s\"", src->dyn_str);\
    }\
    strcpy(json + json_len, ",");\
    ++json_len;\
    strcpy(json + json_len - 1, "}");\
    return json_capacity;\
}\
int struct_B_to_json(struct struct_B* src, char** out_json) {\
    int json_capacity = 2; \
    /* length of f */\
    json_capacity += 5 + snprintf(NULL, 0, "%f", src->f);\
    /* length of i */\
    json_capacity += 5+ snprintf(NULL, 0, "%d", src->i);\
    /* length of str */\
    json_capacity += 7 + strlen(src->str);\
    /* length of str_static */\
    json_capacity += 14 + strlen(src->str_static);\
    /* length of other_struct */\
    json_capacity += 16;\
    /* length of other_struct_typedef */\
    json_capacity += 24;\
    /* length of other_enum */\
    json_capacity += 14;\
    /* length of other_enum_typedef */\
    json_capacity += 22;\
    char* json = malloc(json_capacity);\
    int json_len = 1;\
    strcpy(json, "{");\
    *out_json = json;\
    /* field: f */\
    json_len += sprintf(json + json_len, "\"f\":");\
    json_len += sprintf(json + json_len, "%f", src->f);\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: i */\
    json_len += sprintf(json + json_len, "\"i\":");\
    json_len += sprintf(json + json_len, "%d", src->i);\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: str */\
    json_len += sprintf(json + json_len, "\"str\":");\
    if(src->str != NULL) {\
        json_len += sprintf(json + json_len, "\"%s\"", src->str);\
    }\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: str_static */\
    json_len += sprintf(json + json_len, "\"str_static\":");\
    if(src->str_static != NULL) {\
        json_len += sprintf(json + json_len, "\"%s\"", src->str_static);\
    }\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: other_struct */\
    json_len += sprintf(json + json_len, "\"other_struct\":");\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: other_struct_typedef */\
    json_len += sprintf(json + json_len, "\"other_struct_typedef\":");\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: other_enum */\
    json_len += sprintf(json + json_len, "\"other_enum\":");\
    strcpy(json + json_len, ",");\
    ++json_len;\
    /* field: other_enum_typedef */\
    json_len += sprintf(json + json_len, "\"other_enum_typedef\":");\
    strcpy(json + json_len, ",");\
    ++json_len;\
    strcpy(json + json_len - 1, "}");\
    return json_capacity;\
}\