libstring.h

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#ifndef _LIBSTRING_INC
#define _LIBSTRING_INC
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>

#define string_unit

#ifdef USE_UNICODE
#undef string_unit
#define string_unit uint8_t

#error I have no idea how to implement unicode, but this library should be unicode-safe if you change string_unit
int utf8_strlen(const string_unit *str);

#define _strlen(x) strlen(x)
#else

#undef string_unit
#define string_unit char

#define _strlen(x) strlen(x)
#endif

typedef struct _string_real {
    uint16_t        len;
    uint16_t        tot;
    unsigned char   tmp;
    unsigned char   flg;
    /* string itself follows... */
} string_real;

typedef string_unit* string;

#define SR_MAGIC_NUMBER 1

#define string_to_sr(x) ((string_real *)((unsigned char *)x - sizeof(string_real)))

#define sr_to_string(x) ((string)((unsigned char *)x + sizeof(string_real)))

#define is_sr(x) (((string_real *)((unsigned char *)x - sizeof(string_real)))->flg == SR_MAGIC_NUMBER)

#define string_length(x) is_sr(x) ? string_to_sr(x)->len : _strlen(x)

#define string_free(x) free(is_sr(x)?(void *)string_to_sr(x):(void *)x)

string string_new();
string string_realloc(string a, uint16_t minS);
string string_copy(string a, const string b, uint16_t offset, uint16_t num);
string string_dup(const string a);
string string_temporary(string in);
string string_mknew(const string_unit *in);
string string_appendv(int count, ...);

#define string_append(a, b) string_copy(a, b, string_length(a), 0)

#define string_new_size(x) string_realloc(NULL, x)

#define string_istemporary(x) (is_sr(x)?(string_to_sr(x)->tmp == 1):0)

#endif