supercop

Basic CLI for supercop
git clone git://git.finwo.net/app/supercop
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usage.c (2208B)

      1 #include "usage.h"
      2 
      3 #include <stdio.h>
      4 #include <stdlib.h>
      5 
      6 #include "cofyc/argparse.h"
      7 #include "cli/command.h"
      8 
      9 static int opt_version = 0;
     10 
     11 static const char *const usages[] = {
     12   "supercop [global options] <command> [command options]",
     13   "supercop list-commands",
     14   NULL,
     15 };
     16 
     17 static struct argparse_option options[] = {
     18   OPT_GROUP("Global options:"),
     19   OPT_BOOLEAN('h', "help", NULL, "Show this help message and exit", argparse_help_cb, 0, OPT_NONEG),
     20   OPT_BOOLEAN('V', "version", &opt_version, "Show version information and exit", NULL, 0, OPT_NONEG),
     21   OPT_END(),
     22 };
     23 
     24 // argparse prints the epilog at the end of its usage output, which is the only
     25 // way to get our command listing into the built-in --help handler
     26 static char *build_epilog(void) {
     27   char  *buffer = NULL;
     28   size_t size   = 0;
     29   FILE  *out    = open_memstream(&buffer, &size);
     30   if (!out) {
     31     return NULL;
     32   }
     33 
     34   struct cmd_struct *cmd = commands;
     35 
     36   // The %-17s aligns our descriptions with the ones argparse prints
     37   fprintf(out, "\nCommands:\n");
     38   while (cmd) {
     39     fprintf(out, "    %-17s %s\n", cmd->display ? cmd->display : cmd->name[0],
     40             cmd->description ? cmd->description : "");
     41     cmd = cmd->next;
     42   }
     43 
     44   fclose(out);
     45 
     46   // argparse adds a newline of its own
     47   if (size && buffer[size - 1] == '\n') {
     48     buffer[size - 1] = '\0';
     49   }
     50 
     51   return buffer;
     52 }
     53 
     54 int supercop_global_options(int argc, const char **argv, int *show_version) {
     55   struct argparse argparse;
     56   char           *epilog = build_epilog();
     57 
     58   opt_version = 0;
     59   argparse_init(&argparse, options, usages, ARGPARSE_STOP_AT_NON_OPTION);
     60   argparse_describe(&argparse, "\nMinimalistic program to generate ed25519 keys and verify/sign messages", epilog);
     61   argc = argparse_parse(&argparse, argc, argv);
     62   free(epilog);
     63 
     64   if (show_version) {
     65     *show_version = opt_version;
     66   }
     67 
     68   return argc;
     69 }
     70 
     71 void supercop_print_global_usage(void) {
     72   struct argparse argparse;
     73   char           *epilog = build_epilog();
     74 
     75   argparse_init(&argparse, options, usages, ARGPARSE_STOP_AT_NON_OPTION);
     76   argparse_describe(&argparse, "\nMinimalistic program to generate ed25519 keys and verify/sign messages", epilog);
     77   argparse_usage(&argparse);
     78   free(epilog);
     79 }