1 files changed, 92 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100755
index 0000000..4308e55
--- /dev/null
+++ b/main.c
@@ -0,0 +1,92 @@
+// main.c - Moving average calculator using ts library
+// Computes a simple moving average over configurable period and displays results.
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define TS_IMPLEMENTATION
+#include "ts.h"
+
+#define BUFFER_SIZE 100
+#define DISPLAY_N 20
+
+static void usage(const char *prog)
+{
+    fprintf(stderr, "Usage: %s [period]\n", prog);
+    fprintf(stderr, "  period: moving average window (1-%d, default: 10)\n", BUFFER_SIZE);
+}
+
+int main(int argc, char *argv[]) {
+    uint_t period = 10;
+    if (argc > 1 && (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0)) {
+        usage(argv[0]);
+        return 0;
+    }
+    if (argc > 1) {
+        char *endptr = NULL;
+        errno = 0;
+        long val = strtol(argv[1], &endptr, 10);
+        if (endptr == argv[1] || *endptr != '\0' || errno == ERANGE) {
+            fprintf(stderr, "Error: invalid period '%s'\n", argv[1]);
+            usage(argv[0]);
+            return 1;
+        }
+        if (val < 1 || val > BUFFER_SIZE) {
+            fprintf(stderr, "Error: period must be between 1 and %d\n", BUFFER_SIZE);
+            usage(argv[0]);
+            return 1;
+        }
+        period = (uint_t)val;
+    }
+    if (period == 0 || period > BUFFER_SIZE) {
+        fprintf(stderr, "Error: period must be between 1 and %d\n", BUFFER_SIZE);
+        usage(argv[0]);
+        return 1;
+    }
+
+    fp_t input[BUFFER_SIZE];
+    fp_t output[BUFFER_SIZE];
+    for (int_t i = 0; i < (int_t)BUFFER_SIZE; i++) {
+        output[i] = 0;
+    }
+
+    if (!ts_fill(input, BUFFER_SIZE, 0, (fp_t)BUFFER_SIZE)) {
+        fprintf(stderr, "ts_fill failed\n");
+        return 1;
+    }
+
+    fp_t * const y[1] = { output };
+    fp_t const * const x[1] = { input };
+
+    ts_constant_t c;
+    memset(&c, 0, sizeof(c));
+    *(uint_t *)c.data = period;
+    int ret = ts_average(y, 1, x, 1, BUFFER_SIZE, &c);
+    if (ret == -1) {
+        fprintf(stderr, "ts_average failed\n");
+        return 1;
+    }
+
+    /* Validate output: first valid value is at index period-1 */
+    uint_t offset = period - 1;
+    if (offset >= BUFFER_SIZE) {
+        fprintf(stderr, "error: period exceeds buffer size\n");
+        return 1;
+    }
+
+    /* Clamp display range to valid output */
+    uint_t display_end = DISPLAY_N < BUFFER_SIZE ? DISPLAY_N : BUFFER_SIZE;
+    if (offset >= display_end) {
+        fprintf(stderr, "warning: period (%" TS_PRIuint ") >= display count (%" TS_PRIuint "), showing available data\n", period, display_end);
+        display_end = BUFFER_SIZE;
+    }
+
+    for (uint_t i = offset; i < display_end; i++) {
+        printf("input[%" TS_PRIuint "] = %f  SMA[%" TS_PRIuint "] = %f\n", i, input[i], i, output[i]);
+    }
+
+    return 0;
+}