#if defined(_WIN32) // from https://stackoverflow.com/questions/40159892/using-asprintf-on-windows #include /* needed for vsnprintf */ #include /* needed for malloc, free */ #include /* needed for va_* */ int vscprintf(const char *format, va_list ap) { va_list ap_copy; va_copy(ap_copy, ap); int retval = vsnprintf(NULL, 0, format, ap_copy); va_end(ap_copy); return retval; } /* * asprintf, vasprintf: * MSVC does not implement these, thus we implement them here * GNU-C-compatible compilers implement these with the same names, thus we * don't have to do anything */ int vasprintf(char **strp, const char *format, va_list ap) { int len = vscprintf(format, ap); if (len == -1) return -1; char *str = (char*)malloc((size_t) len + 1); if (!str) return -1; int retval = vsnprintf(str, len + 1, format, ap); if (retval == -1) { free(str); return -1; } *strp = str; return retval; } int asprintf(char **strp, const char *format, ...) { va_list ap; va_start(ap, format); int retval = vasprintf(strp, format, ap); va_end(ap); return retval; } #endif