Test int8 models (#107)

* Test int8 models

* Fix displaying help messages

* small fixes

* Fix jni test

sherpa-onnx/csrc/text-utils.h

@@ -6,7 +6,9 @@
 #define SHERPA_ONNX_CSRC_TEXT_UTILS_H_
 #include <stdlib.h>
 
+#include <limits>
 #include <string>
+#include <type_traits>
 #include <vector>
 
 #ifdef _MSC_VER
@@ -21,6 +23,32 @@
 
 namespace sherpa_onnx {
 
+/// Converts a string into an integer via strtoll and returns false if there was
+/// any kind of problem (i.e. the string was not an integer or contained extra
+/// non-whitespace junk, or the integer was too large to fit into the type it is
+/// being converted into).  Only sets *out if everything was OK and it returns
+/// true.
+template <class Int>
+bool ConvertStringToInteger(const std::string &str, Int *out) {
+  // copied from kaldi/src/util/text-util.h
+  static_assert(std::is_integral<Int>::value, "");
+  const char *this_str = str.c_str();
+  char *end = nullptr;
+  errno = 0;
+  int64_t i = SHERPA_ONNX_STRTOLL(this_str, &end);
+  if (end != this_str) {
+    while (isspace(*end)) ++end;
+  }
+  if (end == this_str || *end != '\0' || errno != 0) return false;
+  Int iInt = static_cast<Int>(i);
+  if (static_cast<int64_t>(iInt) != i ||
+      (i < 0 && !std::numeric_limits<Int>::is_signed)) {
+    return false;
+  }
+  *out = iInt;
+  return true;
+}
+
 /// Split a string using any of the single character delimiters.
 /// If omit_empty_strings == true, the output will contain any
 /// nonempty strings after splitting on any of the
@@ -86,6 +114,10 @@ bool SplitStringToFloats(const std::string &full, const char *delim,
                          bool omit_empty_strings,  // typically false
                          std::vector<F> *out);
 
+// This is defined for F = float and double.
+template <typename T>
+bool ConvertStringToReal(const std::string &str, T *out);
+
 }  // namespace sherpa_onnx
 
 #endif  // SHERPA_ONNX_CSRC_TEXT_UTILS_H_