1 files changed, 115 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..0b65adf
--- /dev/null
+++ b/main.c
@@ -0,0 +1,115 @@
+/* main.c: handles initialization of rc and command line options */
+
+#include "rc.h"
+
+bool dashdee, dashee, dashvee, dashex, dashell, dasheye,
+	dashen, dashpee, interactive;
+int rc_pid;
+
+static bool dashoh;
+
+static void assigndefault(char *,...);
+static void checkfd(int, enum redirtype);
+
+extern void main(int argc, char *argv[], char *envp[]) {
+	char *dashsee[2], *dollarzero, *null[1];
+	int c;
+	initprint();
+	dashsee[0] = dashsee[1] = NULL;
+	dollarzero = argv[0];
+	rc_pid = getpid();
+	dashell = (*argv[0] == '-'); /* Unix tradition */
+	while ((c = rc_getopt(argc, argv, "nolpeivdxc:")) != -1)
+		switch (c) {
+		case 'l':
+			dashell = TRUE;
+			break;
+		case 'e':
+			dashee = TRUE;
+			break;
+		case 'i':
+			dasheye = interactive = TRUE;
+			break;
+		case 'v':
+			dashvee = TRUE;
+			break;
+		case 'x':
+			dashex = TRUE;
+			break;
+		case 'd':
+			dashdee = TRUE;
+			break;
+		case 'c':
+			dashsee[0] = rc_optarg;
+			goto quitopts;
+		case 'n':
+			dashen = TRUE;
+			break;
+		case 'p':
+			dashpee = TRUE;
+			break;
+		case 'o':
+			dashoh = TRUE;
+			break;
+		case '?':
+			exit(1);
+		}
+quitopts:
+	argv += rc_optind;
+	/* use isatty() iff -i is not set, and iff the input is not from a script or -c flag */
+	if (!dasheye && dashsee[0] == NULL && *argv == NULL)
+		interactive = isatty(0);
+	if (!dashoh) {
+		checkfd(0, rFrom);
+		checkfd(1, rCreate);
+		checkfd(2, rCreate);
+	}
+	initsignal();
+	inithash();
+	initparse();
+	assigndefault("prompt", "; ", "", (void *)0);
+#ifdef DEFAULTPATH
+	assigndefault("path", DEFAULTPATH, (void *)0);
+#endif
+	assigndefault("ifs", " ", "\t", "\n", (void *)0);
+	assigndefault("pid", nprint("%d", rc_pid), (void *)0);
+	initenv(envp);
+	initinput();
+	null[0] = NULL;
+	starassign(dollarzero, null, FALSE); /* assign $0 to $* */
+	inithandler();
+	if (dashsee[0] != NULL) {	/* input from the -c flag? */
+		if (*argv != NULL)
+			starassign(dollarzero, argv, FALSE);
+		pushstring(dashsee, TRUE);
+	} else if (*argv != NULL) {	/* else from a file? */
+		b_dot(--argv);
+		rc_exit(getstatus());
+	} else {			/* else stdin */
+		pushfd(0);
+	}
+	dasheye = FALSE;
+	doit(TRUE);
+	rc_exit(getstatus());
+}
+
+static void assigndefault(char *name,...) {
+	va_list ap;
+	List *l;
+	char *v;
+	va_start(ap, name);
+	for (l = NULL; (v = va_arg(ap, char *)) != NULL;)
+		l = append(l, word(v, NULL));
+	varassign(name, l, FALSE);
+	if (streq(name, "path"))
+		alias(name, l, FALSE);
+	va_end(ap);
+}
+
+/* open an fd on /dev/null if it is inherited closed */
+
+static void checkfd(int fd, enum redirtype r) {
+	int new = rc_open("/dev/null", r);
+	if (new != fd && new != -1)
+		close(new);
+}