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+/* Arg_parser - POSIX/GNU command line argument parser. (C version)
+   Copyright (C) 2006-2022 Antonio Diaz Diaz.
+
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
+
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
+
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+*/
+
+/* Arg_parser reads the arguments in 'argv' and creates a number of
+   option codes, option arguments, and non-option arguments.
+
+   In case of error, 'ap_error' returns a non-null pointer to an error
+   message.
+
+   'options' is an array of 'struct ap_Option' terminated by an element
+   containing a code which is zero. A null long_name means a short-only
+   option. A code value outside the unsigned char range means a long-only
+   option.
+
+   Arg_parser normally makes it appear as if all the option arguments
+   were specified before all the non-option arguments for the purposes
+   of parsing, even if the user of your program intermixed option and
+   non-option arguments. If you want the arguments in the exact order
+   the user typed them, call 'ap_init' with 'in_order' = true.
+
+   The argument '--' terminates all options; any following arguments are
+   treated as non-option arguments, even if they begin with a hyphen.
+
+   The syntax for optional option arguments is '-<short_option><argument>'
+   (without whitespace), or '--<long_option>=<argument>'.
+*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum ap_Has_arg { ap_no, ap_yes, ap_maybe };
+
+struct ap_Option
+  {
+  int code;			/* Short option letter or code ( code != 0 ) */
+  const char * long_name;	/* Long option name (maybe null) */
+  enum ap_Has_arg has_arg;
+  };
+
+
+struct ap_Record
+  {
+  int code;
+  char * parsed_name;
+  char * argument;
+  };
+
+
+struct Arg_parser
+  {
+  struct ap_Record * data;
+  char * error;
+  int data_size;
+  int error_size;
+  };
+
+
+char ap_init( struct Arg_parser * const ap,
+              const int argc, const char * const argv[],
+              const struct ap_Option options[], const char in_order );
+
+void ap_free( struct Arg_parser * const ap );
+
+const char * ap_error( const struct Arg_parser * const ap );
+
+/* The number of arguments parsed. May be different from argc. */
+int ap_arguments( const struct Arg_parser * const ap );
+
+/* If ap_code( i ) is 0, ap_argument( i ) is a non-option.
+   Else ap_argument( i ) is the option's argument (or empty). */
+int ap_code( const struct Arg_parser * const ap, const int i );
+
+/* Full name of the option parsed (short or long). */
+const char * ap_parsed_name( const struct Arg_parser * const ap, const int i );
+
+const char * ap_argument( const struct Arg_parser * const ap, const int i );
+
+#ifdef __cplusplus
+}
+#endif