numtools

commit 78c21a3a161c932a93a7cee5749937d275d30bc5
parent 582f4a33313af4f079c993be90659bf26923f67c
Author: Anders Damsgaard <anders@adamsgaard.dk>
Date:   Wed, 25 May 2022 11:23:44 +0200

range(1): -l option: fail if range limits are not positive

Diffstat:
M
range.1
 | 
7
++++---
M
range.c
 | 
4
++++

2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/range.1 b/range.1
@@ -62,7 +62,8 @@ or an entirely open interval when combined with
 Produce output with even intervals in logarithmic space between
 .Ar min_val
 and
-.Ar max_val .
+.Ar max_val ,
+where both must be positive numbers.
 .It Fl n
 Do not print a newline after the final value.
 .It Fl N Ar num
@@ -96,8 +97,8 @@ Generate three space-separated numbers:
 .Dl $ range -d' ' -N 3 1 3
 .Dl 1 2 3
 .Pp
-Generate three numbers evenly distributed in logspace from 10^0 to 10^2:
-.Dl $ range -l -N 3 0 2
+Generate three numbers evenly distributed in logspace from 1 to 100:
+.Dl $ range -l -N 3 1 100
 .Dl 1
 .Dl 10
 .Dl 100
diff --git a/range.c b/range.c
@@ -75,6 +75,10 @@ main(int argc, char *argv[])
 			errx(1, "bad maxv value: %s", argv[0]);
 
 	if (logrange) {
+		if (minv <= 0.0)
+			errx(1, "minv is not positive: %g", minv);
+		if (maxv <= 0.0)
+			errx(1, "maxv is not positive: %g", maxv);
 		minv = log10(minv);
 		maxv = log10(maxv);
 	}