X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2FErrCode.c;h=daa09ccf43079d91db217efc2be21e1a8e30209a;hp=b683d641099ec6f32e1bca89e86bf0286a233db7;hb=26f7a8bb19c6cb198c213757a97b6ac79e40db4b;hpb=74b2dc2662eb6e3c6e64b4b284eeb77afab48c60

diff --git a/sources/ErrCode.c b/sources/ErrCode.c
index b683d64..daa09cc 100644
--- a/sources/ErrCode.c
+++ b/sources/ErrCode.c
@@ -26,8 +26,6 @@
  *
  * Usage: errcode -h give all info's
  *
- * $Id: ErrCode.c,v 1.3 2001/09/12 18:07:32 piccardi Exp $ 
- *
  ****************************************************************/
 /* 
  * Include needed headers
@@ -36,7 +34,8 @@
 #include <stdlib.h>      /* C standard library */
 #include <unistd.h>      /* unix standard library */
 #include <stdio.h>	 /* standard I/O library */
-#include <string.h>      /* string functions */
+#include <string.h>      /* C strings library */
+#include <limits.h>      /* system limits constants, types and functions */
 
 /* Help printing routine */
 void usage(void);
@@ -217,7 +216,17 @@ int main(int argc, char *argv[])
     if (optind == argc) {
 	usage();
     }
+    /* convert string to number */
     err = strtol(argv[optind], NULL, 10);
+    /* testing error condition on conversion */
+    if (err==LONG_MIN) {
+	perror("Underflow on error code");
+	return 1;
+    } else if (err==LONG_MIN) {
+	perror("Overflow on error code");
+	return 1;
+    }
+    /* conversion is fine */
     if (message) {
 	printf("Error message for %d is %s\n", err, strerror(err));
     }
@@ -236,7 +245,7 @@ int main(int argc, char *argv[])
 void usage(void) {
     printf("Print error code message or macro label \n");
     printf("Usage:\n");
-    printf("  daytime [-h] [-l] [-m] error code \n");
+    printf("  errcode [-h] [-l] [-m] error code \n");
     printf("  -m	   print error messages\n");
     printf("  -l	   print error code label\n");
     printf("  -h	   print this help\n");