Replace std::cerr and exit(1) with throw spffl::exception_t

cli/spiff/spiff_main.cpp

@@ -8,6 +8,8 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "spffl_exception.h"
+
 #include "cmd_interp.h"
 
 #include "handlers.h"
@@ -237,7 +239,7 @@ void main_usage(char *argv0) {
   exit(1);
 }
 
-int main(int argc, char **argv) {
+static int try_main(int argc, char **argv) {
   char *exename = argv[0];
   argc--, argv++;
 
@@ -267,3 +269,11 @@ int main(int argc, char **argv) {
   std::cerr << exename << ": subcommand \"" << argv[0] << "\" not found.\n";
   return 1;
 }
+
+int main(int argc, char **argv) {
+  try {
+    try_main(argc, argv);
+  } catch (spffl::exception_t e) {
+    std::cerr << e.what() << "\n";
+  }
+}

src/base/CMakeLists.txt

@@ -3,6 +3,7 @@ cmake_minimum_required (VERSION 3.24)
 project(base)
 
 add_library(${PROJECT_NAME}
+  spffl_exception.cpp
   tokenize.cpp
   line_scan.cpp
 )

src/base/spffl_exception.cpp

@@ -0,0 +1,9 @@
+#include "spffl_exception.h"
+
+namespace spffl {
+
+exception_t::exception_t(const std::string &msg) : msg(msg) {}
+
+const char *exception_t::what() const noexcept { return this->msg.c_str(); }
+
+} // namespace spffl

src/base/spffl_exception.h

@@ -0,0 +1,21 @@
+#ifndef SPFFL_EXCEPTION_H
+#define SPFFL_EXCEPTION_H
+
+#include <exception>
+#include <sstream>
+#include <string>
+
+namespace spffl {
+
+class exception_t : public std::exception {
+public:
+  exception_t(const std::string &msg);
+  virtual const char *what() const noexcept;
+
+private:
+  std::string msg;
+};
+
+} // namespace spffl
+
+#endif // SPFFL_EXCEPTION_H