vasprintf.c

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// From musl libc

#define _GNU_SOURCE
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>

int vasprintf(char** string, const char* fmt, va_list arg_list)
{
    va_list arg_list_copy;
    va_copy(arg_list_copy, arg_list);
    int l = vsnprintf(0, 0, fmt, arg_list_copy);
    va_end(arg_list_copy);

    if(l < 0 || !(*string = malloc((size_t)l + 1U)))
    {
        return -1;
    }

    return vsnprintf(*string, (size_t)l + 1U, fmt, arg_list);
}