opt: add float/double helpers.

[ccan] / ccan / opt / helpers.c

diff --git a/ccan/opt/helpers.c b/ccan/opt/helpers.c
index 2c771bc3309062aa7cfea03423f719128f3c9686..747a78e9139b875e7f7f6620d194510418c2c300 100644 (file)
--- a/ccan/opt/helpers.c
+++ b/ccan/opt/helpers.c
@@ -116,6 +116,49 @@ char *opt_set_ulongval(const char *arg, unsigned long *ul)
        return NULL;
 }
 
+char *opt_set_floatval(const char *arg, float *f)
+{
+       double d;
+       char *err;
+
+       err = opt_set_doubleval(arg, &d);
+       if (err)
+               return err;
+
+       *f = d;
+       if (*f != d)
+               return arg_bad("'%s' is out of range", arg);
+
+       return NULL;
+}
+
+void opt_show_floatval(char buf[OPT_SHOW_LEN], const float *f)
+{
+       double d = *f;
+       opt_show_doubleval(buf, &d);
+}
+
+char *opt_set_doubleval(const char *arg, double *d)
+{
+       char *endp;
+
+       /* This is how the manpage says to do it.  Yech. */
+       errno = 0;
+       /* Don't assume strtof */
+       *d = strtod(arg, &endp);
+       if (*endp || !arg[0])
+               return arg_bad("'%s' is not a number", arg);
+       if (errno)
+               return arg_bad("'%s' is out of range", arg);
+
+       return NULL;
+}
+
+void opt_show_doubleval(char buf[OPT_SHOW_LEN], const double *d)
+{
+       snprintf(buf, OPT_SHOW_LEN, "%f", *d);
+}
+
 char *opt_inc_intval(int *i)
 {
        (*i)++;