Is There A Way To Check If argv[1] Is An Integer?

[Karl Heuer]

In article <11467 at csli.Stanford.EDU> poser at csli.stanford.edu (Bill Poser) writes:
>In article <984 at ux.acss.umn.edu> eric at ux.acss.umn.edu (Eric D. Hendrickson)
>writes the equivalent of:
>int is_integer(char *s) { return(regexec(regcomp("[-+]?[0-9]+"),s)); }

I think regexp is a bit of overkill; I generally use strtol() for this.
(Usually, once you've detected that the argument is in fact an integer, you
need to evaluate it anyway, right?)

And if you're on a backward system that doesn't have strtol(), it's not hard
to write one.  Compared to regexp, for instance.

Karl W. Z. Heuer (ima!haddock!karl or karl at haddock.isc.com), The Walking Lint