1 files changed, 40 insertions, 0 deletions
diff --git a/src/utils/dec2bin.c b/src/utils/dec2bin.c
new file mode 100644
index 0000000..97e59bb
--- /dev/null
+++ b/src/utils/dec2bin.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <err.h>
+
+int
+main(int argc, char *argv[])
+{
+   if (argc < 3)
+      errx(EXIT_FAILURE, "usage: %s <u8|u16|u32|u64> number\n", argv[0]);
+
+   const struct {
+      const char *t;
+      size_t sz;
+   } map[] = {
+      { .t = "u8", .sz = sizeof(uint8_t) },
+      { .t = "u16", .sz = sizeof(uint16_t) },
+      { .t = "u32", .sz = sizeof(uint32_t) },
+      { .t = "u64", .sz = sizeof(uint64_t) },
+   };
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+
+   size_t sz = 0;
+   for (size_t i = 0; i < ARRAY_SIZE(map); ++i) {
+      if (strcmp(argv[1], map[i].t))
+         continue;
+
+      sz = map[i].sz;
+      break;
+   }
+
+   if (!sz)
+      errx(EXIT_FAILURE, "unknown type: %s", argv[1]);
+
+   const uint64_t v = strtoll(argv[2], NULL, 10);
+   fwrite(&v, sz, 1, stdout);
+   return EXIT_SUCCESS;
+}