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strtonum isn't available on <Darwin-11
however, it is in the header files on systems like 10.15 with an
availability clause, so don't define strtonum static such that it
matches the prototype from stdlib.h
diff --git a/netcat.c b/netcat.c
index a0fb51b..bbb5dd1 100644
--- a/netcat.c
+++ b/netcat.c
@@ -240,6 +243,43 @@ static int connect_with_timeout(int fd, const struct sockaddr *sa,
static void quit();
+static char* strtonumerrs[] = {
+ "too large",
+ "too small",
+ "invalid"
+};
+
+long long
+strtonum(
+ const char *nptr,
+ long long minval,
+ long long maxval,
+ const char **errstr)
+{
+ long long val;
+
+ while (*nptr != '\0' && isspace(*nptr))
+ nptr++;
+ if (*nptr == '\0') {
+ if (errstr != NULL)
+ *errstr = strtonumerrs[2];
+ return 0;
+ }
+ val = atoll(nptr);
+ if (val < minval) {
+ if (errstr != NULL)
+ *errstr = strtonumerrs[1];
+ return 0;
+ }
+ if (val > maxval) {
+ if (errstr != NULL)
+ *errstr = strtonumerrs[0];
+ return 0;
+ }
+ *errstr = NULL;
+ return val;
+}
+
int
main(int argc, char *argv[])
{
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