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/* Argp example #4 -- a program with somewhat more complicated options */
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/* This program uses the same features as example 3, but has more options,
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and somewhat more structure in the -help output. It also shows how you
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can `steal' the remainder of the input arguments past a certain point, for
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programs that accept a list of items. It also shows the special argp KEY
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value ARGP_KEY_NO_ARGS, which is only given if no non-option arguments
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were supplied to the program.
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For structuring the help output, two features are used, *headers* which
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are entries in the options vector with the first four fields being zero,
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and a two part documentation string (in the variable DOC), which allows
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documentation both before and after the options; the two parts of DOC are
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separated by a vertical-tab character ('\v', or '\013'). By convention,
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the documentation before the options is just a short string saying what
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the program does, and that afterwards is longer, describing the behavior
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in more detail. All documentation strings are automatically filled for
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output, although newlines may be included to force a line break at a
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particular point. All documenation strings are also passed to the
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`gettext' function, for possible translation into the current locale. */
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/* #include <error.h> */
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const char *argp_program_version = "argp-ex4 1.0";
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const char *argp_program_bug_address = "<bug-gnu-utils@prep.ai.mit.edu>";
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"Argp example #4 -- a program with somewhat more complicated options\
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\vThis part of the documentation comes *after* the options; note that\
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it is automatically filled, but it's possible to force a line-break,\
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static char args_doc[] = "ARG1 [STRING...]";
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/* Keys for options without short-options. */
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#define OPT_ABORT 1 /* --abort */
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static struct argp_option options[] = {
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{"verbose", 'v', 0, 0, "Produce verbose output" },
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{"quiet", 'q', 0, 0, "Don't produce any output" },
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{"silent", 's', 0, OPTION_ALIAS },
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{"output", 'o', "FILE", 0, "Output to FILE instead of standard output" },
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{0, 0, 0, 0, "The following options should be grouped together:" },
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{"repeat", 'r', "COUNT", OPTION_ARG_OPTIONAL,
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"Repeat the output COUNT (default 10) times"},
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{"abort", OPT_ABORT, 0, 0, "Abort before showing any output"},
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/* Used by main to communicate with parse_opt. */
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char *arg1; /* ARG1 */
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char **strings; /* [STRING...] */
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int silent, verbose, abort; /* -s, -v, --abort */
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char *output_file; /* --output=FILE */
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int repeat_count; /* --repeat[=COUNT] */
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parse_opt (int key, char *arg, struct argp_state *state)
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/* Get the INPUT argument from argp_parse, which we know is a pointer to
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our arguments structure. */
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struct arguments *arguments = state->input;
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arguments->silent = 1;
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arguments->verbose = 1;
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arguments->output_file = arg;
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arguments->repeat_count = arg ? atoi (arg) : 10;
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case ARGP_KEY_NO_ARGS:
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/* Here we know that STATE->arg_num == 0, since we force argument
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parsing to end before any more arguments can get here. */
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arguments->arg1 = arg;
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/* Now we consume all the rest of the arguments. STATE->next is the
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index in STATE->argv of the next argument to be parsed, which is the
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first STRING we're interested in, so we can just use
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`&state->argv[state->next]' as the value for arguments->strings.
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IN ADDITION, by setting STATE->next to the end of the arguments, we
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can force argp to stop parsing here and return. */
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arguments->strings = &state->argv[state->next];
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state->next = state->argc;
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return ARGP_ERR_UNKNOWN;
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static struct argp argp = { options, parse_opt, args_doc, doc };
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int main (int argc, char **argv)
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struct arguments arguments;
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/* Default values. */
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arguments.silent = 0;
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arguments.verbose = 0;
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arguments.output_file = "-";
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arguments.repeat_count = 1;
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argp_parse (&argp, argc, argv, 0, 0, &arguments);
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fprintf (stderr, "ABORTED");
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for (i = 0; i < arguments.repeat_count; i++)
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printf ("ARG1 = %s\n", arguments.arg1);
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printf ("STRINGS = ");
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for (j = 0; arguments.strings[j]; j++)
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printf (j == 0 ? "%s" : ", %s", arguments.strings[j]);
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printf ("OUTPUT_FILE = %s\nVERBOSE = %s\nSILENT = %s\n",
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arguments.output_file,
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arguments.verbose ? "yes" : "no",
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arguments.silent ? "yes" : "no");
added
removed
argp/argp-ex4.c
