Replace constants copied from sysexits.h with our own definitions

src/tiv.cpp

@@ -59,19 +59,11 @@
 #include <system_error>
 #endif
 
-// Following codes copied from /usr/include/sysexits.h,
-// license: https://opensource.org/license/BSD-3-clause/
-#define EX_OK 0 /* successful termination */
-#define EX__BASE 64 /* base value for error messages */
-#define EX_USAGE 64 /* command line usage error */
-#define EX_DATAERR 65 /* data format error */
-#define EX_NOINPUT 66 /* cannot open input */
-#define EX_SOFTWARE 70 /* internal software error */
-#define EX_CANTCREAT 73 /* can't create (user) output file */
-#define EX_IOERR 74 /* input/output error */
-#define EX_TEMPFAIL 75 /* temp failure; user is invited to retry */
-#define EX_NOPERM 77 /* permission denied */
-#define EX_CONFIG 78 /* configuration error */
+// Program exit code constants compatible with sysexits.h.
+#define EXITCODE_OK 0
+#define EXITCODE_COMMAND_LINE_USAGE_ERROR 64
+#define EXITCODE_DATA_FORMAT_ERROR 65
+#define EXITCODE_NO_INPUT_ERROR 66
 
 // Implementation of flag representation for flags in the main() method
 constexpr int FLAG_FG = 1;
@@ -581,11 +573,11 @@ int main(int argc, char *argv[]) {
  int columns = 3;
 
  std::vector<std::string> file_names;
- int ret = EX_OK; // The return code for the program
+ int ret = EXITCODE_OK; // The return code for the program
 
  if (argc <= 1) {
  printUsage();
- return EX_USAGE;
+ return EXITCODE_COMMAND_LINE_USAGE_ERROR;
  }
 
  for (int i = 1; i < argc; i++) {
@@ -597,7 +589,7 @@ int main(int argc, char *argv[]) {
  columns = std::stoi(argv[++i]);
  } else {
  std::cerr << "Error: -c requires a number" << std::endl;
- ret = EX_USAGE;
+ ret = EXITCODE_COMMAND_LINE_USAGE_ERROR;
  }
  } else if (arg == "-d" || arg == "--dir") {
  mode = THUMBNAILS;
@@ -608,7 +600,7 @@ int main(int argc, char *argv[]) {
  maxWidth = 4 * std::stoi(argv[++i]), detectSize = false;
  } else {
  std::cerr << "Error: -w requires a number" << std::endl;
- ret = EX_USAGE;
+ ret = EXITCODE_COMMAND_LINE_USAGE_ERROR;
  }
  } else if (arg == "-h") {
  if (i < argc - 1)
@@ -623,7 +615,7 @@ int main(int argc, char *argv[]) {
  flags |= FLAG_TELETEXT;
  } else if (arg[0] == '-') {
  std::cerr << "Error: Unrecognized argument: " << arg << std::endl;
- ret = EX_USAGE;
+ ret = EXITCODE_COMMAND_LINE_USAGE_ERROR;
  } else {
  // Arguments that will be displayed
  if (std::filesystem::is_directory(arg)) {
@@ -638,7 +630,7 @@ int main(int argc, char *argv[]) {
  } else {
  std::cerr << "Error: Cannot open '" << arg
  << "', permission issue?" << std::endl;
- ret = EX_NOINPUT;
+ ret = EXITCODE_NO_INPUT_ERROR;
  }
  }
  }
@@ -694,7 +686,7 @@ int main(int argc, char *argv[]) {
  } catch (cimg_library::CImgIOException &e) {
  std::cerr << "Error: '" << filename
  << "' has an unrecognized file format" << std::endl;
- ret = EX_DATAERR;
+ ret = EXITCODE_DATA_FORMAT_ERROR;
  }
  }
  } else { // Thumbnail mode