//gcc 5.4.0

​

/************************************ asprintf.h ****************************************/

​

/* Sources:

    https://stackoverflow.com/questions/40159892/using-asprintf-on- 

    https://stackoverflow.com/questions/4785381/replacement-for-ms-vscprintf-on-macos-linux

*/

​

#include <stdio.h> /* needed for vsnprintf */

#include <stdlib.h> /* needed for malloc-free */

#include <stdarg.h> /* needed for va_list */

​

#ifndef _vscprintf 

/* For some reason, MSVC fails to honour this #ifndef. */

/* Hence the function was renamed to _vscprintf_so(). */

int _vscprintf_so(const char * format, va_list pargs) {

    int retval;

    va_list argcopy;

    va_copy(argcopy, pargs);

    retval = vsnprintf(NULL, 0, format, argcopy);

    va_end(argcopy);

    return retval;

}

#endif // _vscprintf

​

#ifndef vasprintf

int vasprintf(char **strp, const char *fmt, va_list ap) {

    int len = _vscprintf_so(fmt, ap);

    if (len == -1) return -1;

    char *str = malloc((size_t) len + 1);

    if (!str) return -1;

    int r = vsnprintf(str, len + 1, fmt, ap); /* "secure" version of vsprintf */

    if (r == -1) return free(str), -1;

    *strp = str;

    return r;

}