Add missing copyright headers.

[cdecl99.git] / src / cdecl99.c

diff --git a/src/cdecl99.c b/src/cdecl99.c
index 6eb07cc71c5188ee765ea86f536963701103881e..23c3e5c409e40a004be10d048fa6eaaab28c1116 100644 (file)
--- a/src/cdecl99.c
+++ b/src/cdecl99.c
@@ -1,21 +1,183 @@
+/*
+ *  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 <http://www.gnu.org/licenses/>.
+ */
+#include <config.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include "readline.h"
 #include "cdecl.h"
 
-int main(int argc, char **argv)
+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 <http://gnu.org/licenses/gpl.html>.");
+       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;
 
-       if (argc < 2) {
-               fprintf(stderr, "usage: cdecl99 decl\n");
-               return EXIT_FAILURE;
-       }
+       decl = cdecl_parse_decl(arg);
+       if (!decl)
+               goto out;
 
-       decl = cdecl_parse_decl(argv[1]);
-       if (!decl) {
-               return EXIT_FAILURE;
-       }
+       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;
+}