add option to choose rendered image type

src/main.c

@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "buddhabrot.h"
 #include "image.h"
 #include "mandelbrot.h"
 #include "options.h"
@@ -14,7 +15,15 @@ int main(int argc, char *argv[]) {
     if (!image)
         err(EXIT_FAILURE, "could not allocate image");
 
+    switch (opt.render) {
+    case BUDDHABROT:
+        buddhabrot(image, opt.max_iter);
+        break;
+    case MANDELBROT:
         mandelbrot(image, opt.max_iter);
+        break;
+    }
+
     print_ppm(image, opt.output);
 
     fclose(opt.output);

src/options.c

@@ -2,20 +2,29 @@
 
 #include <err.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
+#define ARR_SIZE(Arr) (sizeof(Arr) / sizeof(*Arr))
+
+static const char *methods[] = {
+    [MANDELBROT] = "mandelbrot",
+    [BUDDHABROT] = "buddhabrot",
+};
+
 struct options parse_options(int *argc, char **argv[]) {
     struct options opts = {
         .output = stdout,
         .w = 960,
         .h = 540,
         .max_iter = 100,
+        .render = BUDDHABROT,
     };
 
     opterr = 0; // Deactivate error message from `getopt`
 
     int opt;
-    while ((opt = getopt(*argc, *argv, "h:m:o:w:")) != -1) {
+    while ((opt = getopt(*argc, *argv, "h:m:o:r:w:")) != -1) {
         switch (opt) {
         case 'h':
             if (!sscanf(optarg, "%zu", &opts.h))
@@ -29,13 +38,26 @@ struct options parse_options(int *argc, char **argv[]) {
             if (!freopen(optarg, "w", opts.output))
                 err(EXIT_FAILURE, "could not open output file");
             break;
+        case 'r': {
+            size_t i;
+            for (i = 0; i < ARR_SIZE(methods); ++i)
+                if (!strcmp(methods[i], optarg)) {
+                    opts.render = i;
+                    break;
+                }
+            if (i == ARR_SIZE(methods))
+                errx(EXIT_FAILURE, "could not parse render");
+            break;
+        }
         case 'w':
             if (!sscanf(optarg, "%zu", &opts.w))
                 errx(EXIT_FAILURE, "could not parse width");
             break;
         default:
             fprintf(stderr,
-                    "Usage: %s [-o FILE] [-m MAX_ITER] [-h HEIGHT] [-w WIDTH]\n",
+                    "Usage: %s "
+                    "[-o FILE] [-i MAX_ITER] [-h HEIGHT] [-w WIDTH] "
+                    "[-r <buddhabrot|mandelbrot>]\n",
                     (*argv)[0]);
             exit(EXIT_FAILURE);
         }

src/options.h

@@ -9,6 +9,10 @@ struct options {
     size_t w;
     size_t h;
     size_t max_iter;
+    enum {
+        BUDDHABROT,
+        MANDELBROT,
+    } render;
 };
 
 struct options parse_options(int *argc, char **argv[]);