+/**
+ * Convert a string representation of a numeric value to a sr_rational.
+ *
+ * The conversion is strict and will fail if the complete string does not
+ * represent a valid number. The function sets errno according to the details
+ * of the failure. This version ignores the locale.
+ *
+ * @param str The string representation to convert.
+ * @param ret Pointer to sr_rational where the result of the conversion will be stored.
+ *
+ * @retval SR_OK Conversion successful.
+ * @retval SR_ERR Failure.
+ *
+ * @since 0.5.0
+ */
+SR_API int sr_parse_rational(const char *str, struct sr_rational *ret)
+{
+ char *endptr = NULL;
+ int64_t integral;
+ int64_t fractional = 0;
+ int64_t denominator = 1;
+ int32_t fractional_len = 0;
+ int32_t exponent = 0;
+
+ errno = 0;
+ integral = g_ascii_strtoll(str, &endptr, 10);
+
+ if (errno)
+ return SR_ERR;
+
+ if (*endptr == '.') {
+ const char* start = endptr + 1;
+ fractional = g_ascii_strtoll(start, &endptr, 10);
+ if (errno)
+ return SR_ERR;
+ fractional_len = endptr - start;
+ }
+
+ if ((*endptr == 'E') || (*endptr == 'e')) {
+ exponent = g_ascii_strtoll(endptr + 1, &endptr, 10);
+ if (errno)
+ return SR_ERR;
+ }
+
+ if (*endptr != '\0')
+ return SR_ERR;
+
+ for (int i = 0; i < fractional_len; i++)
+ integral *= 10;
+ exponent -= fractional_len;
+
+ if (integral >= 0)
+ integral += fractional;
+ else
+ integral -= fractional;
+
+ while (exponent > 0) {
+ integral *= 10;
+ exponent--;
+ }
+
+ while (exponent < 0) {
+ denominator *= 10;
+ exponent++;
+ }
+
+ ret->p = integral;
+ ret->q = denominator;
+
+ return SR_OK;
+}
+