2 * Command line utility for making sense of C declarations.
3 * Copyright © 2011 Nick Bowler
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
29 static const char *progname = "cdecl99";
30 static const char sopts[] = "qbif:e:VH";
31 static const struct option lopts[] = {
32 { "quiet", 0, NULL, 'q' },
33 { "batch", 0, NULL, 'b' },
34 { "interactive", 0, NULL, 'i' },
35 { "file", 1, NULL, 'f' },
36 { "execute", 1, NULL, 'e' },
37 { "version", 0, NULL, 'V' },
38 { "help", 0, NULL, 'H' },
42 static void print_version(void)
45 /* TRANSLATORS: (C) must *always* be translated as ©. */
46 printf("Copyright %s 2011 Nick Bowler.\n", gettext("(C)"));
47 puts("License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.");
48 puts("This is free software: you are free to change and redistribute it.");
49 puts("There is NO WARRANTY, to the extent permitted by law.");
52 static void print_usage(FILE *f)
54 fprintf(f, "Usage: %s [options]\n", progname);
57 static void print_help(void)
60 puts("Detailed help coming soon.");
64 * Format a declaration according to the given function and return a pointer
65 * to the formatted string. The returned pointer remains valid until the
66 * next call, after which it must not be re-used.
68 * Returns NULL on failure.
71 do_format(size_t func(char *, size_t, struct cdecl *), struct cdecl *decl)
79 rc = func(buf, bufsz, decl);
83 tmp = realloc(buf, rc + 1);
85 fprintf(stderr, "failed to allocate memory\n");
97 static int cmd_explain(const char *cmd, const char *arg)
103 decl = cdecl_parse_decl(arg);
107 for (struct cdecl *i = decl; i; i = i->next) {
108 str = do_format(cdecl_explain, i);
121 static int cmd_simplify(const char *cmd, const char *arg)
127 decl = cdecl_parse_decl(arg);
131 for (struct cdecl *i = decl; i; i = i->next) {
132 struct cdecl_declspec *s = i->specifiers;
135 i->specifiers = NULL;
139 str = do_format(cdecl_declare, i);
156 static int cmd_declare(const char *cmd, const char *arg)
162 /* The name of the command is significant here. */
163 decl = cdecl_parse_english(cmd);
168 * English parses have at most one full declarator, so no loop is
171 str = do_format(cdecl_declare, decl);
182 static int cmd_quit(const char *cmd, const char *arg)
187 static int cmd_help(const char *cmd, const char *arg);
189 static const struct command {
191 int (*func)(const char *cmd, const char *arg);
194 { "explain", cmd_explain, "Explain a C declaration." },
195 { "simplify", cmd_simplify, "Simplify a C declaration." },
196 { "declare", cmd_declare, "Construct a C declaration." },
197 { "type", cmd_declare, "Construct a C type name." },
198 { "help", cmd_help, "Print this list of commands." },
199 { "quit", cmd_quit, "Quit the program." },
200 { "exit", cmd_quit, NULL }
202 static const size_t ncommands = sizeof commands / sizeof commands[0];
204 static int cmd_help(const char *cmd, const char *arg)
206 for (size_t i = 0; i < ncommands; i++) {
207 if (!commands[i].blurb)
210 printf("%s -- %s\n", commands[i].name, commands[i].blurb);
217 * Ensure that the first n characters of str equal the entire (null-terminated)
220 static int cmd_cmp(const char *str, const char *cmd, size_t n)
222 size_t cmdlen = strlen(cmd);
228 return memcmp(str, cmd, n);
231 static int run_command(const char *line)
233 const char *cmd = line + strspn(line, " \t");
234 const char *arg = cmd + strcspn(cmd, " \t");
239 for (size_t i = 0; i < ncommands; i++) {
240 if (cmd_cmp(cmd, commands[i].name, arg-cmd) != 0)
243 return commands[i].func(cmd, arg);
246 fprintf(stderr, "Undefined command: %.*s\n", (int)(arg-cmd), cmd);
250 static int repl(void)
254 for (; (line = readline("> ")); free(line)) {
255 if (!run_command(line))
263 static int repl_cmdline(int argc, char **argv)
265 int opt, rc, ret = 0;
268 while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
272 rc = run_command(optarg);
282 static int repl_noninteractive(void)
284 int rc, ret = 0, saved_errno;
288 while (getline(&line, &n, stdin) >= 0) {
289 char *c = strchr(line, '\n');
293 rc = run_command(line);
305 perror("read error");
312 int main(int argc, char **argv)
314 bool show_intro = true, interactive = true, execute = false;
315 const char *filename = NULL;
321 /* Initialize gettext. */
322 setlocale(LC_ALL, "");
323 bindtextdomain(PACKAGE, LOCALEDIR);
326 while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
355 /* --filename and --execute imply --batch. */
356 if (filename || execute)
359 /* --batch implies --quiet */
360 if (interactive && show_intro)
363 /* --execute supersedes --filename */
364 if (filename && !execute) {
365 if (!freopen(filename, "r", stdin)) {
374 rc = repl_cmdline(argc, argv);
376 rc = repl_noninteractive();