Giuseppe Bilotta <giuseppe.bilo...@gmail.com> writes: > Not in the sense I mean above. If the string is a sequences of > whitespace characters, strtod would return 0 as value (no conversion), > and set endptr to the end of the string, because it would gobble the > whitespace. This would be indistinguishable from it successfully > parsing a string argument of, say, '0.0'.
No, strtod requires a non-empty sequence of digits.
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
char *blanks = " ";
char *endptr;
double x;
x = strtod(blanks, &endptr);
printf("x: %f endptr: \"%s\"\n", x, endptr);
}
$ ./a.out
x: 0.000000 endptr: " "
strtod is actually not a terrible function (surprising for libc, I know)
> Hm. Since we have to do it both for scale and gamma, I wonder if it's
> overengineering if I try to refactor this parsing of "N or 1 positive
> values with separator S" into its own function.
Yes. I'd just use sscanf or strtod directly as you please.
--
-keith
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