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/* main.c -- initialization for es ($Revision: 1.3 $) */
#include "es.h"
#if GCVERBOSE
Boolean gcverbose = FALSE; /* -G */
#endif
#if GCINFO
Boolean gcinfo = FALSE; /* -I */
#endif
/* #if 0 && !HPUX && !defined(linux) && !defined(sgi) */
/* extern int getopt (int argc, char **argv, const char *optstring); */
/* #endif */
extern int optind;
extern char *optarg;
/* extern int isatty(int fd); */
extern char **environ;
/* checkfd -- open /dev/null on an fd if it is closed */
static void checkfd(int fd, OpenKind r) {
int new;
new = dup(fd);
if (new != -1)
close(new);
else if (errno == EBADF && (new = eopen("/dev/null", r)) != -1)
mvfd(new, fd);
}
/* initpath -- set $path based on the configuration default */
static void initpath(void) {
int i;
static const char * const path[] = { INITIAL_PATH };
Ref(List *, list, NULL);
for (i = arraysize(path); i-- > 0;) {
Term *t = mkstr((char *) path[i]);
list = mklist(t, list);
}
vardef("path", NULL, list);
RefEnd(list);
}
/* initpid -- set $pid for this shell */
static void initpid(void) {
vardef("pid", NULL, mklist(mkstr(str("%d", getpid())), NULL));
}
/* runesrc -- run the user's profile, if it exists */
static void runesrc(void) {
char *esrc = str("%L/.esrc", varlookup("home", NULL), "\001");
int fd = eopen(esrc, oOpen);
if (fd != -1) {
ExceptionHandler
runfd(fd, esrc, 0);
CatchException (e)
if (termeq(e->term, "exit"))
exit(exitstatus(e->next));
else if (termeq(e->term, "error"))
eprint("%L\n",
e->next == NULL ? NULL : e->next->next,
" ");
else if (!issilentsignal(e))
eprint("uncaught exception: %L\n", e, " ");
return;
EndExceptionHandler
}
}
/* usage -- print usage message and die */
static noreturn usage(void) {
eprint(
"usage: es [-c command] [-silevxnpo] [file [args ...]]\n"
" -c cmd execute argument\n"
" -s read commands from standard input; stop option parsing\n"
" -i interactive shell\n"
" -l login shell\n"
" -e exit if any command exits with false status\n"
" -v print input to standard error\n"
" -x print commands to standard error before executing\n"
" -n just parse; don't execute\n"
" -p don't load functions from the environment\n"
" -o don't open stdin, stdout, and stderr if they were closed\n"
" -d don't ignore SIGQUIT or SIGTERM\n"
#if GCINFO
" -I print garbage collector information\n"
#endif
#if GCVERBOSE
" -G print verbose garbage collector information\n"
#endif
#if LISPTREES
" -L print parser results in LISP format\n"
#endif
);
exit(1);
}
/* main -- initialize, parse command arguments, and start running */
int main(int argc, char **argv) {
int c;
volatile int ac;
char **volatile av;
volatile int runflags = 0; /* -[einvxL] */
volatile Boolean protected = FALSE; /* -p */
volatile Boolean allowquit = FALSE; /* -d */
volatile Boolean cmd_stdin = FALSE; /* -s */
volatile Boolean loginshell = FALSE; /* -l or $0[0] == '-' */
Boolean keepclosed = FALSE; /* -o */
const char *volatile cmd = NULL; /* -c */
initgc();
initconv();
if (argc == 0) {
argc = 1;
argv = ealloc(2 * sizeof (char *));
argv[0] = "es";
argv[1] = NULL;
}
if (*argv[0] == '-')
loginshell = TRUE;
while ((c = getopt(argc, argv, "eilxvnpodsc:?GIL")) != EOF)
switch (c) {
case 'c': cmd = optarg; break;
case 'e': runflags |= eval_exitonfalse; break;
case 'i': runflags |= run_interactive; break;
case 'n': runflags |= run_noexec; break;
case 'v': runflags |= run_echoinput; break;
case 'x': runflags |= run_printcmds; break;
#if LISPTREES
case 'L': runflags |= run_lisptrees; break;
#endif
case 'l': loginshell = TRUE; break;
case 'p': protected = TRUE; break;
case 'o': keepclosed = TRUE; break;
case 'd': allowquit = TRUE; break;
case 's': cmd_stdin = TRUE; goto getopt_done;
#if GCVERBOSE
case 'G': gcverbose = TRUE; break;
#endif
#if GCINFO
case 'I': gcinfo = TRUE; break;
#endif
default:
usage();
}
getopt_done:
if (cmd_stdin && cmd != NULL) {
eprint("es: -s and -c are incompatible\n");
exit(1);
}
if (!keepclosed) {
checkfd(0, oOpen);
checkfd(1, oCreate);
checkfd(2, oCreate);
}
if (
cmd == NULL
&& (optind == argc || cmd_stdin)
&& (runflags & run_interactive) == 0
&& isatty(0)
)
runflags |= run_interactive;
ac = argc;
av = argv;
ExceptionHandler
roothandler = &_localhandler; /* unhygeinic */
initinput();
initprims();
initvars();
runinitial();
initpath();
initpid();
initsignals(runflags & run_interactive, allowquit);
hidevariables();
initenv(environ, protected);
if (loginshell)
runesrc();
if (cmd == NULL && !cmd_stdin && optind < ac) {
int fd;
char *file = av[optind++];
if ((fd = eopen(file, oOpen)) == -1) {
eprint("%s: %s\n", file, esstrerror(errno));
return 1;
}
vardef("*", NULL, listify(ac - optind, av + optind));
vardef("0", NULL, mklist(mkstr(file), NULL));
return exitstatus(runfd(fd, file, runflags));
}
vardef("*", NULL, listify(ac - optind, av + optind));
vardef("0", NULL, mklist(mkstr(av[0]), NULL));
if (cmd != NULL)
return exitstatus(runstring(cmd, NULL, runflags));
return exitstatus(runfd(0, "stdin", runflags));
CatchException (e)
if (termeq(e->term, "exit"))
return exitstatus(e->next);
else if (termeq(e->term, "error"))
eprint("%L\n",
e->next == NULL ? NULL : e->next->next,
" ");
else if (!issilentsignal(e))
eprint("uncaught exception: %L\n", e, " ");
return 1;
EndExceptionHandler
}
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