trange(1): -l option: fail if range limits are not positive - numtools - perform numerical operations on vectors and matrices in unix pipes
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       ---
 (DIR) commit 78c21a3a161c932a93a7cee5749937d275d30bc5
 (DIR) parent 582f4a33313af4f079c993be90659bf26923f67c
 (HTM) 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(-)
       ---
 (DIR) diff --git a/range.1 b/range.1
       t@@ -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
       t@@ -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
 (DIR) diff --git a/range.c b/range.c
       t@@ -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);
                }