tree_edit.h

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#ifndef LY_TREE_EDIT_H_
#define LY_TREE_EDIT_H_

#include <stdlib.h>

#ifndef LOGMEM
#define LOGMEM(CTX)
#endif

#ifdef __cplusplus
extern "C" {
#endif

void *ly_realloc(void *ptr, size_t size);

#define LY_ARRAY_NEW(CTX, ARRAY, EACTION) \
    { \
        char *p__; \
        if (ARRAY) { \
            ++(*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1)); \
            p__ = (char *)realloc(((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1), \
                    sizeof(LY_ARRAY_COUNT_TYPE) + (*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1) * sizeof *(ARRAY))); \
            if (!p__) { \
                --(*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1)); \
                LOGMEM(CTX); \
                EACTION; \
            } \
        } else { \
            p__ = (char *)malloc(sizeof(LY_ARRAY_COUNT_TYPE) + sizeof *(ARRAY)); \
            if (!p__) { \
                LOGMEM(CTX); \
                EACTION; \
            } \
            *((LY_ARRAY_COUNT_TYPE*)(p__)) = 1; \
        } \
        p__ = (char *)((LY_ARRAY_COUNT_TYPE*)(p__) + 1); \
        memcpy(&(ARRAY), &p__, sizeof p__); \
    }

#define LY_ARRAY_NEW_RET(CTX, ARRAY, NEW_ITEM, RETVAL) \
    LY_ARRAY_NEW(CTX, ARRAY, return RETVAL); \
    (NEW_ITEM) = &(ARRAY)[*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1) - 1]; \
    memset(NEW_ITEM, 0, sizeof *(NEW_ITEM))

#define LY_ARRAY_NEW_GOTO(CTX, ARRAY, NEW_ITEM, RET, GOTO) \
    LY_ARRAY_NEW(CTX, ARRAY, RET = LY_EMEM; goto GOTO); \
    (NEW_ITEM) = &(ARRAY)[*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1) - 1]; \
    memset(NEW_ITEM, 0, sizeof *(NEW_ITEM))

#define LY_ARRAY_CREATE(CTX, ARRAY, SIZE, EACTION) \
    { \
        char *p__; \
        if (ARRAY) { \
            p__ = (char *)realloc(((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1), \
                    sizeof(LY_ARRAY_COUNT_TYPE) + ((*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1) + (SIZE)) * sizeof *(ARRAY))); \
            if (!p__) { \
                LOGMEM(CTX); \
                EACTION; \
            } \
        } else { \
            p__ = (char *)calloc(1, sizeof(LY_ARRAY_COUNT_TYPE) + (SIZE) * sizeof *(ARRAY)); \
            if (!p__) { \
                LOGMEM(CTX); \
                EACTION; \
            } \
        } \
        p__ = (char *)((LY_ARRAY_COUNT_TYPE*)(p__) + 1); \
        memcpy(&(ARRAY), &p__, sizeof p__); \
        if (ARRAY) { \
            memset(&(ARRAY)[*((LY_ARRAY_COUNT_TYPE*)(p__) - 1)], 0, (SIZE) * sizeof *(ARRAY)); \
        } \
    }

#define LY_ARRAY_CREATE_RET(CTX, ARRAY, SIZE, RETVAL) \
    LY_ARRAY_CREATE(CTX, ARRAY, SIZE, return RETVAL)

#define LY_ARRAY_CREATE_GOTO(CTX, ARRAY, SIZE, RET, GOTO) \
    LY_ARRAY_CREATE(CTX, ARRAY, SIZE, RET = LY_EMEM; goto GOTO)

#define LY_ARRAY_INCREMENT(ARRAY) \
        ++(*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1))

#define LY_ARRAY_DECREMENT(ARRAY) \
        --(*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1))

#define LY_ARRAY_DECREMENT_FREE(ARRAY) \
        --(*((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1)); \
        if (!LY_ARRAY_COUNT(ARRAY)) { \
            LY_ARRAY_FREE(ARRAY); \
            (ARRAY) = NULL; \
        }

#define LY_ARRAY_FREE(ARRAY) \
        if (ARRAY){free((LY_ARRAY_COUNT_TYPE*)(ARRAY) - 1);}

#define LY_LIST_INSERT(LIST, NEW_ITEM, LINKER)\
    if (!(*LIST)) { \
        memcpy(LIST, &(NEW_ITEM), sizeof NEW_ITEM); \
    } else { \
        size_t offset__ = (char *)&(*LIST)->LINKER - (char *)(*LIST); \
        char **iter__ = (char **)((size_t)(*LIST) + offset__); \
        while (*iter__) { \
            iter__ = (char **)((size_t)(*iter__) + offset__); \
        } \
        memcpy(iter__, &(NEW_ITEM), sizeof NEW_ITEM); \
    }

#define LY_LIST_NEW(CTX, LIST, NEW_ITEM, LINKER, EACTION) \
    { \
        char *p__ = (char *)calloc(1, sizeof *NEW_ITEM); \
        if (!p__) { \
            LOGMEM(CTX); \
            EACTION; \
        } \
        memcpy(&(NEW_ITEM), &p__, sizeof p__); \
        LY_LIST_INSERT(LIST, NEW_ITEM, LINKER); \
    }

#define LY_LIST_NEW_RET(CTX, LIST, NEW_ITEM, LINKER, RETVAL) \
    LY_LIST_NEW(CTX, LIST, NEW_ITEM, LINKER, return RETVAL)

#define LY_LIST_NEW_GOTO(CTX, LIST, NEW_ITEM, LINKER, RET, LABEL) \
    LY_LIST_NEW(CTX, LIST, NEW_ITEM, LINKER, RET = LY_EMEM; goto LABEL)

#ifdef __cplusplus
}
#endif

#endif /* LY_TREE_EDIT_H_ */