recognize -k argument

x.c

@@ -73,6 +73,7 @@ void print_help(char *path)
  fprintf(stderr, " -d : force decompression\n");
  fprintf(stderr, " -z : force compression\n");
  fprintf(stderr, " -f : overwrite existing output file\n");
+ fprintf(stderr, " -k : keep (don't delete) input file (default)\n");
  fprintf(stderr, " -h : print this message\n");
 }
 
@@ -193,7 +194,7 @@ int main(int argc, char *argv[])
  FILE *ostream = NULL;
  int force = 0;
 
- parse: switch (getopt(argc, argv, "zdf1h")) {
+ parse: switch (getopt(argc, argv, "zdf1kh")) {
  case 'z':
  mode = COMPRESS;
  goto parse;
@@ -206,6 +207,8 @@ int main(int argc, char *argv[])
  case '1':
  max_layers = 1;
  goto parse;
+ case 'k':
+ goto parse;
  case 'h':
  print_help(argv[0]);
  return 0;