/*
* Command line utility for making sense of C declarations.
* Copyright © 2011 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#include
#include
#include
#include
#include
#include "readline.h"
#include "cdecl.h"
static const char *progname = "cdecl99";
static const char sopts[] = "VH";
static const struct option lopts[] = {
{ "version", 0, NULL, 'V' },
{ "help", 0, NULL, 'H' },
{ 0 }
};
static void print_version(void)
{
puts(PACKAGE_STRING);
puts("Copyright (C) 2011 Nick Bowler.");
puts("License GPLv3+: GNU GPL version 3 or later .");
puts("This is free software: you are free to change and redistribute it.");
puts("There is NO WARRANTY, to the extent permitted by law.");
}
static void print_usage(FILE *f)
{
fprintf(f, "Usage: %s [options]\n", progname);
}
static void print_help(void)
{
print_usage(stdout);
puts("Detailed help coming soon.");
}
static int cmd_explain(char *cmd, char *arg)
{
static size_t bufsz;
static char *buf;
struct cdecl *decl;
size_t rc;
decl = cdecl_parse_decl(arg);
if (!decl)
goto out;
for (struct cdecl *i = decl; i; i = i->next) {
retry:
rc = cdecl_explain(buf, bufsz, i);
if (rc >= bufsz) {
char *tmp;
tmp = realloc(buf, rc + 1);
if (!tmp) {
fprintf(stderr, "failed to allocate memory\n");
goto out;
}
buf = tmp;
bufsz = rc + 1;
goto retry;
}
printf("%s\n", buf);
}
out:
cdecl_free(decl);
return 1;
}
static int cmd_quit(char *cmd, char *arg)
{
return 0;
}
static int cmd_help(char *cmd, char *arg);
static const struct command {
char name[16];
int (*func)(char *cmd, char *arg);
const char *blurb;
} commands[] = {
{ "explain", cmd_explain, "Explain a C declaration." },
{ "help", cmd_help, "Print this list of commands." },
{ "quit", cmd_quit, "Quit the program." },
{ "exit", cmd_quit, NULL }
};
static const size_t ncommands = sizeof commands / sizeof commands[0];
static int cmd_help(char *cmd, char *arg)
{
for (size_t i = 0; i < ncommands; i++) {
if (!commands[i].blurb)
continue;
printf("%s -- %s\n", commands[i].name, commands[i].blurb);
}
return 1;
}
static int repl(void)
{
char *line;
int ret;
print_version();
for (; (line = readline("> ")); free(line)) {
char *cmd = line + strspn(line, " \t");
char *arg = cmd + strcspn(cmd, " \t");
if (cmd[0] == '\0')
continue;
if (arg[0] != '\0')
*arg++ = '\0';
for (size_t i = 0; i < ncommands; i++) {
if (strcmp(cmd, commands[i].name) != 0)
continue;
ret = commands[i].func(cmd, arg);
if (ret <= 0)
goto out;
goto next;
}
fprintf(stderr, "Undefined command: %s\n", cmd);
next:
;
}
ret = 0;
out:
free(line);
return ret;
}
int main(int argc, char **argv)
{
int opt;
if (argc > 0)
progname = argv[0];
while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
switch (opt) {
case 'V':
print_version();
return EXIT_SUCCESS;
case 'H':
print_help();
return EXIT_SUCCESS;
default:
print_usage(stderr);
return EXIT_FAILURE;
}
}
if (repl() != 0)
return EXIT_FAILURE;
return EXIT_SUCCESS;
}