src/cdecl99.c

   1 #include <config.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <getopt.h>
   6 #include "readline.h"
   7 #include "cdecl.h"
   8
   9 static const char *progname = "cdecl99";
  10 static const char sopts[] = "VH";
  11 static const struct option lopts[] = {
  12         { "version", 0, NULL, 'V' },
  13         { "help",    0, NULL, 'H' },
  14         { 0 }
  15 };
  16
  17 static void print_version(void)
  18 {
  19         puts(PACKAGE_STRING);
  20         puts("Copyright (C) 2011 Nick Bowler.");
  21         puts("License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.");
  22         puts("This is free software: you are free to change and redistribute it.");
  23         puts("There is NO WARRANTY, to the extent permitted by law.");
  24 }
  25
  26 static void print_usage(FILE *f)
  27 {
  28         fprintf(f, "Usage: %s [options]\n", progname);
  29 }
  30
  31 static void print_help(void)
  32 {
  33         print_usage(stdout);
  34         puts("Detailed help coming soon.");
  35 }
  36
  37 static int cmd_explain(char *cmd, char *arg)
  38 {
  39         struct cdecl *decl;
  40
  41         decl = cdecl_parse_decl(arg);
  42         cdecl_free(decl);
  43
  44         return 1;
  45 }
  46
  47 static int cmd_quit(char *cmd, char *arg)
  48 {
  49         return 0;
  50 }
  51
  52 static int cmd_help(char *cmd, char *arg);
  53
  54 static const struct command {
  55         char name[16];
  56         int (*func)(char *cmd, char *arg);
  57         const char *blurb;
  58 } commands[] = {
  59         { "explain", cmd_explain, "Explain a C declaration." },
  60         { "help",    cmd_help,    "Print this list of commands." },
  61         { "quit",    cmd_quit,    "Quit the program." },
  62         { "exit",    cmd_quit,    NULL }
  63 };
  64 static const size_t ncommands = sizeof commands / sizeof commands[0];
  65
  66 static int cmd_help(char *cmd, char *arg)
  67 {
  68         for (size_t i = 0; i < ncommands; i++) {
  69                 if (!commands[i].blurb)
  70                         continue;
  71
  72                 printf("%s -- %s\n", commands[i].name, commands[i].blurb);
  73         }
  74
  75         return 1;
  76 }
  77
  78 static int repl(void)
  79 {
  80         char *line;
  81         int ret;
  82
  83         print_version();
  84
  85         for (; (line = readline("> ")); free(line)) {
  86                 char *cmd = line + strspn(line, " \t");
  87                 char *arg = cmd  + strcspn(cmd, " \t");
  88
  89                 if (cmd[0] == '\0')
  90                         continue;
  91                 if (arg[0] != '\0')
  92                         *arg++ = '\0';
  93
  94                 for (size_t i = 0; i < ncommands; i++) {
  95                         if (strcmp(cmd, commands[i].name) != 0)
  96                                 continue;
  97
  98                         ret = commands[i].func(cmd, arg);
  99                         if (ret <= 0)
 100                                 goto out;
 101                         goto next;
 102                 }
 103
 104                 fprintf(stderr, "Undefined command: %s\n", cmd);
 105         next:
 106                 ;
 107         }
 108
 109         ret = 0;
 110 out:
 111         free(line);
 112         return ret;
 113 }
 114
 115 int main(int argc, char **argv)
 116 {
 117         int opt;
 118
 119         if (argc > 0)
 120                 progname = argv[0];
 121
 122         while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
 123                 switch (opt) {
 124                 case 'V':
 125                         print_version();
 126                         return EXIT_SUCCESS;
 127                 case 'H':
 128                         print_help();
 129                         return EXIT_SUCCESS;
 130                 default:
 131                         print_usage(stderr);
 132                         return EXIT_FAILURE;
 133                 }
 134         }
 135
 136         if (repl() != 0)
 137                 return EXIT_FAILURE;
 138
 139         return EXIT_SUCCESS;
 140 }