getopt-based arg parsing

frossi85 · Sep 9, 2012 · 9957933 · 9957933
1 parent 7812297
commit 9957933
Showing 1 changed file with 13 additions and 4 deletions.
diff --git a/posterize.c b/posterize.c
@@ -293,15 +293,24 @@ static void voronoi(const double histogram[], unsigned int palette[])
  }
 }
 
+#include <unistd.h>
+
 int main(int argc, char *argv[])
 {
- int argn=1;
  bool dither = false;
- if (argc==3 && 0==strcmp("-d", argv[1])) {
- dither=true;
- argn++;
+ int ch;
+ while ((ch = getopt(argc, argv, "hvdq:")) != -1) {
+ switch (ch) {
+ case 'd': dither = true; break;
+ case '?': case 'h':
+ default:
+ usage(argv[0]);
+ return 1;
+ }
  }
  int maxcolors=0;
+ int argn = optind;
+
  if (argc==(argn+1)) {
  maxcolors=atoi(argv[argn]);
  argn++;