actually skip N bytes when the -skip/-offset option is used

git-svn-id: https://svn.code.sf.net/p/vice-emu/code/trunk@45942 379a1393-f5fb-40a0-bcee-ef074d9b53f7

Author: mrdudz

vice/src/tools/petcat/petcat.c

@@ -1162,7 +1162,8 @@ int main(int argc, char **argv)
 
         /* reading offset */
         if (!strcmp(argv[0], "-skip") || !strcmp(argv[0], "-offset")) {
-            if (argc > 1 && sscanf(argv[1], "%lx", &offset) == 1) {
+            if (argc > 1) {
+                offset = strtoul(argv[1], NULL, 0);
                 --argc; ++argv;
                 continue;
             }
@@ -1329,6 +1330,12 @@ int main(int argc, char **argv)
                 fprintf(dest, "\n\n;%s ", (fil ? argv[0] : "<stdin>"));
             }
 
+            /* skip "offset" bytes */
+            while (offset > 0) {
+                getc(source);
+                offset--;
+            }
+
             /*
              * Use TEXT mode if the offset doesn't equal BASIC load addresses
              * and the first bytes to be read do not contain load address.