#include <stdlib.h>
#include <stdio.h>
#include "args.h"
-#include "config.h"
+#include <config.h>
+#include "vorconfig.h"
// Look and Feel
int opt_fullscreen;
int opt_sound;
+int opt_joystick_enabled;
+int opt_joystick_number;
+int opt_joystick_x_axis;
+int opt_joystick_y_axis;
int opt_autopilot;
puts("Dodge the rocks until you die.");
putchar('\n');
puts(" -f, --full-screen");
- puts(" -s, --silent No explosion sounds or music");
- puts(" -V, --version Print program version");
- puts(" -?, --help Give this help list");
+ puts(" -s, --silent No explosion sounds or music");
+ puts(" -j x,y, --joystick=x,y set the axis numbers. defaults to 0,1");
+ puts(" press a joystick button to activate that joystick");
+ puts(" -V, --version Print program version");
+ puts(" -?, --help Give this help list");
putchar('\n');
puts("Report bugs at http://jasonwoof.com/contact.html");
}
+// Advances buf while reading a positive int, terminated by [^0-9]
+// buf is left pointing at first [^0-9]
+// If digits are found, the parsed number is written to *out and 0 is returned.
+// Otherwise *buf and *out are left unchanged, and non-zero is returned.
+int
+parse_next_int(char **buf, int* out) {
+ int ret = 0, mul = 1;
+ if(!*buf) {
+ return 1;
+ }
+ // make sure *buf starts -?[0-9]
+ if(**buf == '-') {
+ mul = -1;
+ if((*buf)[1] < '0' || (*buf)[1] > '9') {
+ return 2;
+ }
+ *buf += 1;
+ } else {
+ if(**buf < '0' || **buf > '9') {
+ return 2;
+ }
+ }
+ while(**buf >= '0' && **buf <= '9') {
+ ret *= 10;
+ ret += **buf - '0';
+ *buf += 1;
+ }
+ *out = ret * mul;
+
+ return 0;
+}
+
+// returns 1 on success. return 0 causes usage message
+int
+parse_joystick_opts(char *arg) {
+ char *arg_was = arg;
+ static char* bad_arg = "Error: invalid argument to -j/--joystick.";
+
+ // argument is required
+ if(arg == NULL) {
+ puts(bad_arg);
+ return 0;
+ }
+
+ // read x axis
+ if(parse_next_int(&arg, &opt_joystick_x_axis)) {
+ puts(bad_arg);
+ return 0;
+ }
+
+ // skip comma
+ if(*arg != ',') {
+ puts(bad_arg);
+ return 0;
+ }
+ arg += 1;
+
+ // read y axis
+ if(parse_next_int(&arg, &opt_joystick_y_axis)) {
+ puts(bad_arg);
+ return 0;
+ }
+
+ // optionally joystick number
+ if(*arg == ',') {
+ arg += 1; // skip comma
+ if(parse_next_int(&arg, &opt_joystick_number)) {
+ puts(bad_arg);
+ return 0;
+ }
+ opt_joystick_enabled = 1;
+ }
+
+ // end with a comma or end of string
+ if(*arg != 0 && *arg != ',') {
+ puts(bad_arg);
+ return 0;
+ }
+
+ // mark arg as consumed (so it won't be parsed as a commandline switch)
+ arg_was[0] = 0;
+
+ // return success
+ return 1;
+}
int
short_opt(char c, char *arg)
{
switch(c) {
case 'f': opt_fullscreen = 1; break;
case 's': opt_sound = 0; break;
+ case 'j':
+ return parse_joystick_opts(arg);
case 'V':
- printf("Variations on Rockdodger %s\n", VERSION);
+ printf("Variations on Rockdodger %s\n", PACKAGE_VERSION);
exit(0);
case '?':
case 'h': return 0;
return short_opt(*s, arg);
}
-static char *long_opts[] = { "full-screen", "silent", "version", "help", "autopilot" };
+static char *long_opts[] = { "full-screen", "silent", "joystick", "version", "help", "autopilot" };
-static char short_opts[] = { 'f', 's', 'V', 'h', 'a' };
+static char short_opts[] = { 'f', 's', 'j', 'V', 'h', 'a' };
int
parse_long_opt(const char *s, char *arg)
{
opt_fullscreen = 0;
opt_sound = 1;
+ opt_joystick_enabled = 0; // can also be enabled by pressing one of its buttons
+ opt_joystick_number = 0;
+ opt_joystick_x_axis = 0;
+ opt_joystick_y_axis = 1;
opt_autopilot = 0;
}
init_opts();
for(i=1; i<argc; i++) {
char *s, *arg;
+ // args that are consumed as arguments to an option (such as the zero
+ // in: -j 0) have their first byte set to null. So skip them:
s = argv[i]; if(!*s) continue;
if(*s++ != '-') {
fputs("not an option\n\n", stderr);
arg = NULL;
for(r=s; *r; r++) if(*r == '=') { *r = 0; arg = r+1; break; }
- if(!arg && (i+1 < argc)) arg = argv[i+1];
+
+ if(arg == NULL && i + 1 < argc) {
+ arg = argv[i+1];
+ // if this is used, it's first byte will be set to null, and
+ // it'll be skipped. See above.
+ }
if(*s == '-') {
if(!parse_long_opt(s+1, arg)) { show_help(); return 0; }