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/>.
28 static const char *progname = "cdecl99";
29 static const char sopts[] = "qbif:e:VH";
30 static const struct option lopts[] = {
31 { "quiet", 0, NULL, 'q' },
32 { "batch", 0, NULL, 'b' },
33 { "interactive", 0, NULL, 'i' },
34 { "file", 1, NULL, 'f' },
35 { "execute", 1, NULL, 'e' },
36 { "version", 0, NULL, 'V' },
37 { "help", 0, NULL, 'H' },
41 static void print_version(void)
44 puts("Copyright (C) 2011 Nick Bowler.");
45 puts("License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.");
46 puts("This is free software: you are free to change and redistribute it.");
47 puts("There is NO WARRANTY, to the extent permitted by law.");
50 static void print_usage(FILE *f)
52 fprintf(f, "Usage: %s [options]\n", progname);
55 static void print_help(void)
58 puts("Detailed help coming soon.");
62 * Format a declaration according to the given function and return a pointer
63 * to the formatted string. The returned pointer remains valid until the
64 * next call, after which it must not be re-used.
66 * Returns NULL on failure.
69 do_format(size_t func(char *, size_t, struct cdecl *), struct cdecl *decl)
77 rc = func(buf, bufsz, decl);
81 tmp = realloc(buf, rc + 1);
83 fprintf(stderr, "failed to allocate memory\n");
95 static int cmd_explain(const char *cmd, const char *arg)
101 decl = cdecl_parse_decl(arg);
105 for (struct cdecl *i = decl; i; i = i->next) {
106 str = do_format(cdecl_explain, i);
119 static int cmd_simplify(const char *cmd, const char *arg)
125 decl = cdecl_parse_decl(arg);
129 for (struct cdecl *i = decl; i; i = i->next) {
130 struct cdecl_declspec *s = i->specifiers;
133 i->specifiers = NULL;
137 str = do_format(cdecl_declare, i);
154 static int cmd_declare(const char *cmd, const char *arg)
160 /* The name of the command is significant here. */
161 decl = cdecl_parse_english(cmd);
166 * English parses have at most one full declarator, so no loop is
169 str = do_format(cdecl_declare, decl);
180 static int cmd_quit(const char *cmd, const char *arg)
185 static int cmd_help(const char *cmd, const char *arg);
187 static const struct command {
189 int (*func)(const char *cmd, const char *arg);
192 { "explain", cmd_explain, "Explain a C declaration." },
193 { "simplify", cmd_simplify, "Simplify a C declaration." },
194 { "declare", cmd_declare, "Construct a C declaration." },
195 { "type", cmd_declare, "Construct a C type name." },
196 { "help", cmd_help, "Print this list of commands." },
197 { "quit", cmd_quit, "Quit the program." },
198 { "exit", cmd_quit, NULL }
200 static const size_t ncommands = sizeof commands / sizeof commands[0];
202 static int cmd_help(const char *cmd, const char *arg)
204 for (size_t i = 0; i < ncommands; i++) {
205 if (!commands[i].blurb)
208 printf("%s -- %s\n", commands[i].name, commands[i].blurb);
215 * Ensure that the first n characters of str equal the entire (null-terminated)
218 static int cmd_cmp(const char *str, const char *cmd, size_t n)
220 size_t cmdlen = strlen(cmd);
226 return memcmp(str, cmd, n);
229 static int run_command(const char *line)
231 const char *cmd = line + strspn(line, " \t");
232 const char *arg = cmd + strcspn(cmd, " \t");
237 for (size_t i = 0; i < ncommands; i++) {
238 if (cmd_cmp(cmd, commands[i].name, arg-cmd) != 0)
241 return commands[i].func(cmd, arg);
244 fprintf(stderr, "Undefined command: %.*s\n", (int)(arg-cmd), cmd);
248 static int repl(void)
252 for (; (line = readline("> ")); free(line)) {
253 if (!run_command(line))
261 static int repl_cmdline(int argc, char **argv)
263 int opt, rc, ret = 0;
266 while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
270 rc = run_command(optarg);
280 static int repl_noninteractive(void)
282 int rc, ret = 0, saved_errno;
286 while (getline(&line, &n, stdin) >= 0) {
287 char *c = strchr(line, '\n');
291 rc = run_command(line);
303 perror("read error");
310 int main(int argc, char **argv)
312 bool show_intro = true, interactive = true, execute = false;
313 const char *filename = NULL;
319 while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
348 /* --filename and --execute imply --batch. */
349 if (filename || execute)
352 /* --batch implies --quiet */
353 if (interactive && show_intro)
356 /* --execute supersedes --filename */
357 if (filename && !execute) {
358 if (!freopen(filename, "r", stdin)) {
367 rc = repl_cmdline(argc, argv);
369 rc = repl_noninteractive();