+#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;
+retry:
+ rc = cdecl_explain(buf, bufsz, decl);
+ if (rc >= bufsz) {
+ char *tmp;
+
+ tmp = realloc(buf, rc + 1);
+ if (!tmp) {
+ fprintf(stderr, "failed to allocate memory\n");
+ return 1;
+ }
+
+ 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;
+}