diff options
Diffstat (limited to 'missing/nan.c')
-rw-r--r-- | missing/nan.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/missing/nan.c b/missing/nan.c new file mode 100644 index 0000000000..507cc586d2 --- /dev/null +++ b/missing/nan.c @@ -0,0 +1,28 @@ +#include "ruby/missing.h" +#include <assert.h> +#include <stdlib.h> +#include <string.h> + +double +nan(const char *spec) +{ +#if 0 + /* FIXME: we have not yet seen any situation this is + * necessary. Please write a proper implementation that + * covers this branch. */ + if (spec && spec[0]) { + double generated_nan; + int len = snprintf(NULL, 0, "NAN(%s)", spec); + char *buf = malloc(len + 1); /* +1 for NUL */ + sprintf(buf, "NAN(%s)", spec); + generated_nan = strtod(buf, NULL); + free(buf); + return generated_nan; + } + else +#endif + { + assert(!spec || !spec[0]); + return (double)NAN; + } +} |