format.h: add format_fpu64_trimmed

(cherry picked from commit 9e3b19a)
LedgerHQ · Aug 18, 2023 · da768fb · da768fb
1 parent bad36e6
commit da768fb
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diff --git a/lib_standard_app/format.c b/lib_standard_app/format.c
@@ -129,6 +129,24 @@ bool format_fpu64(char *dst, size_t dst_len, const uint64_t value, uint8_t decim
     return true;
 }
 
+bool format_fpu64_trimmed(char *dst, size_t dst_len, const uint64_t value, uint8_t decimals) {
+    if (!format_fpu64(dst, dst_len, value, decimals)) {
+        return false;
+    }
+
+    size_t len = strlen(dst);
+
+    while (len > 0 && (dst[len - 1] == '0' || dst[len - 1] == '.')) {
+        if (dst[len - 1] == '.') {
+            dst[len - 1] = '\0';
+            return true;
+        }
+        len--;
+    }
+    dst[len] = '\0';
+    return true;
+}
+
 int format_hex(const uint8_t *in, size_t in_len, char *out, size_t out_len) {
     if (out_len < 2 * in_len + 1) {
         return -1;

diff --git a/lib_standard_app/format.h b/lib_standard_app/format.h
@@ -51,6 +51,23 @@ bool format_u64(char *dst, size_t dst_len, uint64_t value);
  */
 bool format_fpu64(char *dst, size_t dst_len, const uint64_t value, uint8_t decimals);
 
+/**
+ * Format 64-bit unsigned integer as string with decimals and trimmed zeros and dot.
+ *
+ * @param[out] dst
+ *   Pointer to output string.
+ * @param[in]  dst_len
+ *   Length of output string.
+ * @param[in]  value
+ *   64-bit unsigned integer to format.
+ * @param[in]  decimals
+ *   Number of digits after decimal separator.
+ *
+ * @return true if success, false otherwise.
+ *
+ */
+bool format_fpu64_trimmed(char *dst, size_t dst_len, const uint64_t value, uint8_t decimals);
+
 /**
  * Format byte buffer to uppercase hexadecimal string.
  *