Fixed help message

README.md

@@ -8,7 +8,7 @@ of other businesses, but for me it's more than enough.
 # Usage
 
 	Usage: ./on-stock [-l] [-s [name]] [-m [name (a/s)quantity]] 
-	                  [-d [name]] [-n] [-f filename]
+	                  [-d [name]] [-n] [-h] [-f filename]
 	-l = list the articles in the database
 	-s = search for an article in the database
          If no name is given as argument, you will be prompted for a name.
@@ -24,6 +24,7 @@ of other businesses, but for me it's more than enough.
          If a name is given as argument, no confirmation will be required to
          delete the article from the database.
 	-n = create new articles (interactive mode only)
+	-h = display this help message
 	-f = specifiy a filename for the database
 
 

on-stock.c

@@ -46,7 +46,7 @@ int main(int argc, char* argv[])
     }
     
     /* Process command line arugments */
-    while ((opt = getopt(argc, argv, "lsmdnf:")) != -1)
+    while ((opt = getopt(argc, argv, "hlsmdnf:")) != -1)
     {
         switch (opt)
 	{
@@ -68,6 +68,9 @@ int main(int argc, char* argv[])
 	case 'f':
 	    strncpy(filename, optarg, FILEMAXLENGTH-1);
 	    break;
+	case 'h':
+	    printUsage(argv[0]);
+	    return 0;
         default:
 	    printUsage(argv[0]);
             return 1;
@@ -357,12 +360,24 @@ int new(struct myData *datap, int numRec)
 
 void printUsage(char *arg)
 {
-    fprintf(stderr, "Usage: %s [-l] [-s] [-m [-d [-n] [-f filename]\n"
+    fprintf(stderr, "Usage: %s [-l] [-s [name]] [-m [name (a/s)quantity]]\n" 
+	             "[-d [name]] [-n] [-h] [-f filename]\n\n"
 	"-l = list the articles in the database\n"
 	"-s = search for an article in the database\n"
+        "     If no name is given as argument, you will be prompted for a name.\n"
 	"-m = modify a article\n"
+        "     If no name is given as argument, you will be prompted for a\n"
+        "     name. You'll then have the choice to change name, quantity and price.\n"
+        "     If a name is given as argument, the quantity can be changed from the\n"
+        "     command line, such as subtracting the stock by three:\n"
+        "     ./on-stock -m 'Nailgun' s3\n"
 	"-d = delete a article\n"
-	    "-n = create a new article\n"
+        "     If no name is given as argument, you will be prompted for an article\n"
+        "     to delete.\n"
+        "     If a name is given as argument, no confirmation will be required to\n"
+        "     delete the article from the database.\n"
+	"-n = create new articles (interactive mode only)\n"
+	"-h = display this help message\n"
 	"-f = specifiy a filename for the database\n", arg);
 }