diff options
| -rw-r--r-- | libshouldbeinlibc/argp-test.c | 96 |
1 files changed, 79 insertions, 17 deletions
diff --git a/libshouldbeinlibc/argp-test.c b/libshouldbeinlibc/argp-test.c index ae72b223..a3a40c3f 100644 --- a/libshouldbeinlibc/argp-test.c +++ b/libshouldbeinlibc/argp-test.c @@ -22,6 +22,9 @@ #include <config.h> #endif +#include <stdlib.h> +#include <time.h> +#include <string.h> #include <argp.h> char *argp_program_version = "argp-test 1.0"; @@ -64,10 +67,27 @@ sub_parse_opt (int key, char *arg, struct argp_state *state) return 0; } +static char * +sub_help_filter (int key, const char *text, void *input) +{ + if (key == ARGP_KEY_HELP_EXTRA) + return strdup ("This is some extra text from the sub parser (note that it +is preceded by a blank line)."); + else + return (char *)text; +} + static struct argp sub_argp = { - sub_options, sub_parse_opt, sub_args_doc, sub_doc + sub_options, sub_parse_opt, sub_args_doc, sub_doc, 0, sub_help_filter }; +/* Structure used to communicate with the parsing functions. */ +struct params +{ + unsigned foonly; /* Value parsed for foonly. */ + unsigned foonly_default; /* Default value for it. */ +}; + #define OPT_PGRP 1 #define OPT_SESS 2 @@ -89,7 +109,7 @@ struct argp_option options[] = " the current process)" }, {0,0,0,0, "Here are some more options:"}, - {"foonly", 'f', "ZOT", 0, "Glork a foonly"}, + {"foonly", 'f', "ZOT", OPTION_ARG_OPTIONAL, "Glork a foonly"}, {"zaza", 'z', 0, 0, "Snit a zar"}, {0} @@ -98,11 +118,28 @@ struct argp_option options[] = static const char args_doc[] = "STRING"; static const char doc[] = "Test program for argp." "\vThis doc string comes after the options." - "\nHey! Some manual formatting!"; + "\nHey! Some manual formatting!" + "\nThe current time is: %s"; + +static void +popt (int key, char *arg) +{ + char buf[10]; + if (isprint (key)) + sprintf (buf, "%c", key); + else + sprintf (buf, "%d", key); + if (arg) + printf ("KEY %s: %s\n", buf, arg); + else + printf ("KEY %s\n", buf); +} static error_t parse_opt (int key, char *arg, struct argp_state *state) { + struct params *params = state->input; + switch (key) { case ARGP_KEY_NO_ARGS: @@ -115,19 +152,17 @@ parse_opt (int key, char *arg, struct argp_state *state) printf ("ARG: %s\n", arg); break; + case 'f': + if (arg) + params->foonly = atoi (arg); + else + params->foonly = params->foonly_default; + popt (key, arg); + break; + case 'p': case 'P': case OPT_PGRP: case 'x': case 'Q': - case 'r': case OPT_SESS: case 'f': case 'z': - { - char buf[10]; - if (isprint (key)) - sprintf (buf, "%c", key); - else - sprintf (buf, "%d", key); - if (arg) - printf ("KEY %s: %s\n", buf, arg); - else - printf ("KEY %s\n", buf); - } + case 'r': case OPT_SESS: case 'z': + popt (key, arg); break; default: @@ -136,12 +171,39 @@ parse_opt (int key, char *arg, struct argp_state *state) return 0; } +static char * +help_filter (int key, const char *text, void *input) +{ + char *new_text; + struct params *params = input; + + if (key == ARGP_KEY_HELP_POST_DOC && text) + { + time_t now = time (0); + asprintf (&new_text, text, ctime (&now)); + } + else if (key == 'f') + /* Show the default for the --foonly option. */ + asprintf (&new_text, "%s (ZOT defaults to %x)", + text, params->foonly_default); + else + new_text = (char *)text; + + return new_text; +} + static struct argp_child argp_children[] = { { &sub_argp }, { 0 } }; -static struct argp argp = { options, parse_opt, args_doc, doc, argp_children }; +static struct argp argp = { + options, parse_opt, args_doc, doc, argp_children, help_filter +}; int main (int argc, char **argv) { - argp_parse (&argp, argc, argv, 0, 0, 0); + struct params params; + params.foonly = 0; + params.foonly_default = random (); + argp_parse (&argp, argc, argv, 0, 0, ¶ms); + printf ("After parsing: foonly = %x\n", params.foonly); return 0; } |