Add initial copy-pasted code

1 files changed, 40 insertions, 0 deletions

diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..24da427
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,40 @@
+#include "utils.h"
+#include <unistd.h>
+#include <stdint.h>
+#include <math.h>
+
+/* Taken from sox */
+const char* level(int channel, int peak)
+{
+    static char const * const text[][2] = {
+        /* White: 2dB steps */
+        {"", ""}, {"-", "-"}, {"=", "="}, {"-=", "=-"},
+        {"==", "=="}, {"-==", "==-"}, {"===", "==="}, {"-===", "===-"},
+        {"====", "===="}, {"-====", "====-"}, {"=====", "====="},
+        {"-=====", "=====-"}, {"======", "======"},
+        /* Red: 1dB steps */
+        {"!=====", "=====!"},
+    };
+    int const red = 1, white = NUMOF(text) - red;
+
+    double linear = ((double)peak) / INT16_MAX;
+
+    int vu_dB = linear ? floor(2 * white + red + linear_to_dB(linear)) : 0;
+
+    int index = vu_dB < 2 * white ?
+        MAX(vu_dB / 2, 0) :
+        MIN(vu_dB - white, red + white - 1);
+
+    return text[index][channel];
+}
+
+size_t strlen_utf8(const char *s) {
+    size_t result = 0;
+
+    // ignore continuation bytes - only count single/leading bytes
+    while (*s)
+        if ((*s++ & 0xC0) != 0x80)
+            result++;
+
+    return result;
+}