diff options
Diffstat (limited to 'src/usr.bin/jot/jot.c')
| -rw-r--r-- | src/usr.bin/jot/jot.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/src/usr.bin/jot/jot.c b/src/usr.bin/jot/jot.c index 8952ead..e4fdade 100644 --- a/src/usr.bin/jot/jot.c +++ b/src/usr.bin/jot/jot.c @@ -1,4 +1,4 @@ -/* $OpenBSD: jot.c,v 1.26 2015/10/09 01:37:07 deraadt Exp $ */ +/* $OpenBSD: jot.c,v 1.27 2016/01/10 01:15:52 tb Exp $ */ /* $NetBSD: jot.c,v 1.3 1994/12/02 20:29:43 pk Exp $ */ /*- @@ -40,6 +40,8 @@ #include <stdbool.h> #include <ctype.h> #include <limits.h> +#include <math.h> +#include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> @@ -268,11 +270,45 @@ main(int argc, char *argv[]) if (reps == 0) infinity = true; if (randomize) { - x = (ender - begin) * (ender > begin ? 1 : -1); + bool use_unif; + uint32_t pow10 = 1; + uint32_t uintx = 0; /* Initialized to make gcc happy. */ + + if (prec > 9) /* pow(10, prec) > UINT32_MAX */ + errx(1, "requested precision too large"); + + while (prec-- > 0) + pow10 *= 10; + + if (ender < begin) { + x = begin; + begin = ender; + ender = x; + } + x = ender - begin; + + /* + * If pow10 * (ender - begin) is an integer, use + * arc4random_uniform(). + */ + use_unif = fmod(pow10 * (ender - begin), 1) == 0; + if (use_unif) { + uintx = pow10 * (ender - begin); + if (uintx >= UINT32_MAX) + errx(1, "requested range too large"); + uintx++; + } + for (i = 1; i <= reps || infinity; i++) { double v; - y = arc4random() / ((double)0xffffffff + 1); - v = y * x + begin; + + if (use_unif) { + y = arc4random_uniform(uintx) / (double)pow10; + v = y + begin; + } else { + y = arc4random() / ((double)0xffffffff + 1); + v = y * x + begin; + } if (putdata(v, reps == i && !infinity)) errx(1, "range error in conversion: %f", v); } |