manual/examples/argp-ex2.c

   1 /* Argp example #2 -- a pretty minimal program using argp */
   2
   3 /* This program doesn't use any options or arguments, but uses
   4    argp to be compliant with the GNU standard command line
   5    format.
   6
   7    In addition to making sure no arguments are given, and
   8    implementing a --help option, this example will have a
   9    --version option, and will put the given documentation string
  10    and bug address in the --help output, as per GNU standards.
  11
  12    The variable ARGP contains the argument parser specification;
  13    adding fields to this structure is the way most parameters are
  14    passed to argp_parse (the first three fields are usually used,
  15    but not in this small program).  There are also two global
  16    variables that argp knows about defined here,
  17    ARGP_PROGRAM_VERSION and ARGP_PROGRAM_BUG_ADDRESS (they are
  18    global variables because they will almost always be constant
  19    for a given program, even if it uses different argument
  20    parsers for various tasks).  */
  21
  22 #include <argp.h>
  23
  24 const char *argp_program_version =
  25   "argp-ex2 1.0";
  26 const char *argp_program_bug_address =
  27   "<bug-gnu-utils@@gnu.org>";
  28
  29 /* Program documentation.  */
  30 static char doc[] =
  31   "Argp example #2 -- a pretty minimal program using argp";
  32
  33 /* Our argument parser.  The @code{options}, @code{parser}, and
  34    @code{args_doc} fields are zero because we have neither options or
  35    arguments; @code{doc} and @code{argp_program_bug_address} will be
  36    used in the output for @samp{--help}, and the @samp{--version}
  37    option will print out @code{argp_program_version}.  */
  38 static struct argp argp = { 0, 0, 0, doc };
  39
  40 int main (int argc, char **argv)
  41 {
  42   argp_parse (&argp, argc, argv, 0, 0, 0);
  43   exit (0);
  44 }