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/* main.c: handles initialization of rc and command line options */
#include "rc.h"
bool dashdee, dashee, dashvee, dashex, dashell, dashEYE, dasheye,
dashen, dashpee, dashess, interactive;
pid_t rc_pid;
static bool dashoh;
static void assigndefault(char *,...);
static void checkfd(int, enum redirtype);
extern int 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, "c:deiIlnopsvx")) != -1)
switch (c) {
case 'c':
dashsee[0] = rc_optarg;
goto quitopts;
case 'd':
dashdee = TRUE;
break;
case 'e':
dashee = TRUE;
break;
case 'I':
dashEYE = TRUE;
interactive = FALSE;
break;
case 'i':
dasheye = interactive = TRUE;
break;
case 'l':
dashell = TRUE;
break;
case 'n':
dashen = TRUE;
break;
case 'o':
dashoh = TRUE;
break;
case 'p':
dashpee = TRUE;
break;
case 's':
dashess = TRUE;
break;
case 'v':
dashvee = TRUE;
break;
case 'x':
dashex = TRUE;
break;
case '?':
exit(1);
}
quitopts:
argv += rc_optind;
/* use isatty() iff neither -i nor -I is set, and iff the input is not from a script or -c flags */
if (!dasheye && !dashEYE && dashsee[0] == NULL && (dashess || *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 || dashess) { /* input from -c or -s? */
if (*argv != NULL)
starassign(dollarzero, argv, FALSE);
if (dashess)
pushfd(0);
else
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());
return 0; /* Never really reached. */
}
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);
}
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