Hello,

I notice that when pass a non-numeric char to strtod, musl will set errno to non-zero, but glibc will set errno to zero.

I am curious why this difference exists, and whether it is necessary to make strtod in musl behave similarly to glibc.

Here is the toy program:

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

int main(int argc, char** argv) {

errno = 0;

char input[] = "NA023";

strtod(input, NULL);

printf("errno = %d\n", errno);

perror("strtod");

return 0;

}

Output (musl):

bash-4.3# ./main

errno = 22

strtod: Invalid argument

Output (glibc, Ubuntu 16.04):

> ./main

errno = 0

strtod: Success

Best,

Xiaowei