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ruby.c
1466 lines (1300 loc) · 31.8 KB
/
ruby.c
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/*
* This file is covered by the Ruby license. See COPYING for more details.
*
* Copyright (C) 2012, The MacRuby Team. All rights reserved.
* Copyright (C) 2007-2011, Apple Inc. All rights reserved.
* Copyright (C) 1993-2007 Yukihiro Matsumoto
* Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
* Copyright (C) 2000 Information-technology Promotion Agency, Japan
*/
#include <stdio.h>
#include <sys/types.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/param.h>
#include "macruby_internal.h"
#include "ruby/node.h"
#include "ruby/encoding.h"
#include "dln.h"
#include "vm.h"
#include "encoding.h"
#include "ruby/util.h"
#ifndef HAVE_STDLIB_H
char *getenv();
#endif
/* TODO: move to VM */
VALUE ruby_debug = Qfalse;
VALUE ruby_verbose = Qfalse;
VALUE ruby_debug_socket_path = Qfalse;
VALUE ruby_aot_compile = Qfalse;
VALUE ruby_aot_init_func = Qfalse;
VALUE ruby_aot_bs_files = Qnil;
VALUE rb_progname = Qnil;
static int uid, euid, gid, egid;
static void
init_ids(void)
{
uid = (int)getuid();
euid = (int)geteuid();
gid = (int)getgid();
egid = (int)getegid();
if (uid && (euid != uid || egid != gid)) {
rb_set_safe_level(1);
}
}
#if !defined(MACRUBY_STATIC)
VALUE rb_parser_get_yydebug(VALUE);
VALUE rb_parser_set_yydebug(VALUE, VALUE);
const char *ruby_get_inplace_mode(void);
void ruby_set_inplace_mode(const char *);
#define DISABLE_BIT(bit) (1U << disable_##bit)
enum disable_flag_bits {
disable_gems,
disable_rubyopt,
};
#define DUMP_BIT(bit) (1U << dump_##bit)
enum dump_flag_bits {
dump_insns,
};
struct cmdline_options {
int sflag, xflag;
int do_loop, do_print;
int do_check, do_line;
int do_split, do_search;
int usage;
int version;
int copyright;
unsigned int disable;
int verbose;
int yydebug;
unsigned int dump;
const char *script;
VALUE script_name;
VALUE e_script;
struct {
struct {
VALUE name;
rb_encoding *enc;
} enc;
} src, ext;
};
struct cmdline_arguments {
int argc;
char **argv;
struct cmdline_options *opt;
};
static NODE *load_file(VALUE, const char *, int, struct cmdline_options *);
static void forbid_setid(const char *);
static struct {
int argc;
char **argv;
#if !defined(PSTAT_SETCMD) && !defined(HAVE_SETPROCTITLE)
int len;
#endif
} origarg;
static void
usage(const char *name)
{
/* This message really ought to be max 23 lines.
* Removed -h because the user already knows that option. Others? */
static const char *const usage_msg[] = {
"-0[octal] specify record separator (\\0, if no argument)",
"-a autosplit mode with -n or -p (splits $_ into $F)",
"-c check syntax only",
"-Cdirectory cd to directory, before executing your script",
"-d set debugging flags (set $DEBUG to true)",
"-e 'command' one line of script. Several -e's allowed. Omit [programfile]",
"-Eencoding specifies the character encoding for the program codes",
"-Fpattern split() pattern for autosplit (-a)",
"-i[extension] edit ARGV files in place (make backup if extension supplied)",
"-Idirectory specify $LOAD_PATH directory (may be used more than once)",
"-l enable line ending processing",
"-n assume 'while gets(); ... end' loop around your script",
"-p assume loop like -n but print line also like sed",
"-rlibrary require the library, before executing your script",
"-s enable some switch parsing for switches after script name",
"-S look for the script using PATH environment variable",
"-T[level] turn on tainting checks",
"-v print version number, then turn on verbose mode",
"-w turn warnings on for your script",
"-W[level] set warning level; 0=silence, 1=medium, 2=verbose (default)",
"-x[directory] strip off text before #!ruby line and perhaps cd to directory",
"--copyright print the copyright",
"--version print the version",
NULL
};
const char *const *p = usage_msg;
printf("Usage: %s [switches] [--] [programfile] [arguments]\n", name);
while (*p)
printf(" %s\n", *p++);
}
VALUE rb_get_load_path(void);
#ifndef CharNext /* defined as CharNext[AW] on Windows. */
#define CharNext(p) ((p) + mblen(p, RUBY_MBCHAR_MAXSIZE))
#endif
#define rubylib_mangled_path rb_str_new
#define rubylib_mangled_path2 rb_str_new2
static void
push_include(const char *path, VALUE (*filter)(VALUE))
{
const char sep = PATH_SEP_CHAR;
const char *p, *s;
VALUE load_path = rb_vm_load_path();
p = path;
while (*p) {
while (*p == sep) {
p++;
}
if (!*p) {
break;
}
for (s = p; *s && *s != sep; s = CharNext(s));
rb_ary_push(load_path, (*filter)(rubylib_mangled_path(p, s - p)));
p = s;
}
}
void
ruby_push_include(const char *path, VALUE (*filter)(VALUE))
{
if (path != NULL) {
push_include(path, filter);
}
}
static VALUE
identical_path(VALUE path)
{
return path;
}
void
ruby_incpush(const char *path)
{
ruby_push_include(path, identical_path);
}
static VALUE
expand_include_path(VALUE path)
{
const char *p = RSTRING_PTR(path);
if (!p) {
return path;
}
if (*p == '.' && p[1] == '/') {
return path;
}
return rb_file_expand_path(path, Qnil);
}
void
ruby_incpush_expand(const char *path)
{
ruby_push_include(path, expand_include_path);
}
static CFMutableArrayRef req_list = NULL;
static void
add_modules(const char *mod)
{
CFStringRef mod_str;
if (req_list == NULL) {
req_list = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
}
mod_str = CFStringCreateWithFileSystemRepresentation(NULL, mod);
CFArrayAppendValue(req_list, mod_str);
CFRelease(mod_str);
}
extern void Init_ext(void);
extern VALUE rb_vm_top_self(void);
void
rb_require_libraries(void)
{
static bool init = false;
if (init) {
return;
}
init = true;
Init_ext(); /* should be called here for some reason :-( */
if (req_list != NULL) {
VALUE vm;
ID require;
int i, count;
vm = rb_vm_top_self();
require = rb_intern("require");
for (i = 0, count = CFArrayGetCount(req_list); i < count; i++) {
const void *feature = CFArrayGetValueAtIndex(req_list, i);
rb_funcall2(vm, require, 1, (VALUE *)&feature);
}
CFRelease(req_list);
}
}
static void
process_sflag(struct cmdline_options *opt)
{
if (opt->sflag) {
long i, n;
VALUE argv = rb_argv;
n = RARRAY_LEN(argv);
i = 0;
while (n > 0) {
VALUE v = RARRAY_AT(argv, i++);
char *s = StringValuePtr(v);
char *p;
int hyphen = Qfalse;
if (s[0] != '-')
break;
n--;
if (s[1] == '-' && s[2] == '\0')
break;
v = Qtrue;
/* check if valid name before replacing - with _ */
for (p = s + 1; *p; p++) {
if (*p == '=') {
*p++ = '\0';
v = rb_str_new2(p);
break;
}
if (*p == '-') {
hyphen = Qtrue;
}
else if (*p != '_' && !ISALNUM(*p)) {
VALUE name_error[2];
name_error[0] =
rb_str_new2("invalid name for global variable - ");
if (!(p = strchr(p, '='))) {
rb_str_cat2(name_error[0], s);
}
else {
rb_str_cat(name_error[0], s, p - s);
}
name_error[1] = RARRAY_AT(argv, -1);
rb_exc_raise(rb_class_new_instance(2, name_error, rb_eNameError));
}
}
s[0] = '$';
if (hyphen) {
for (p = s + 1; *p; ++p) {
if (*p == '-')
*p = '_';
}
}
rb_gv_set(s, v);
}
n = RARRAY_LEN(argv) - n;
while (n--) {
rb_ary_shift(argv);
}
}
opt->sflag = 0;
}
NODE *rb_parser_append_print(VALUE, NODE *);
NODE *rb_parser_while_loop(VALUE, NODE *, int, int);
static int proc_options(int argc, char **argv, struct cmdline_options *opt);
static char *
moreswitches(const char *s, struct cmdline_options *opt)
{
int argc;
char *argv[3];
const char *p = s;
argc = 2;
argv[0] = argv[2] = 0;
while (*s && !ISSPACE(*s))
s++;
argv[1] = ALLOCA_N(char, s - p + 2);
argv[1][0] = '-';
strncpy(argv[1] + 1, p, s - p);
argv[1][s - p + 1] = '\0';
proc_options(argc, argv, opt);
while (*s && ISSPACE(*s))
s++;
return (char *)s;
}
#define NAME_MATCH_P(name, str, len) \
((len) < sizeof(name) && strncmp((str), name, (len)) == 0)
#define UNSET_WHEN(name, bit, str, len) \
if (NAME_MATCH_P(name, str, len)) { \
*(unsigned int *)arg &= ~(bit); \
return; \
}
#define SET_WHEN(name, bit, str, len) \
if (NAME_MATCH_P(name, str, len)) { \
*(unsigned int *)arg |= (bit); \
return; \
}
static void
enable_option(const char *str, int len, void *arg)
{
#define UNSET_WHEN_DISABLE(bit) UNSET_WHEN(#bit, DISABLE_BIT(bit), str, len)
UNSET_WHEN_DISABLE(gems);
UNSET_WHEN_DISABLE(rubyopt);
if (NAME_MATCH_P("all", str, len)) {
*(unsigned int *)arg = 0U;
return;
}
rb_warn("unknown argument for --enable: `%.*s'", len, str);
}
static void
disable_option(const char *str, int len, void *arg)
{
#define SET_WHEN_DISABLE(bit) SET_WHEN(#bit, DISABLE_BIT(bit), str, len)
SET_WHEN_DISABLE(gems);
SET_WHEN_DISABLE(rubyopt);
if (NAME_MATCH_P("all", str, len)) {
*(unsigned int *)arg = ~0U;
return;
}
rb_warn("unknown argument for --disable: `%.*s'", len, str);
}
static void
dump_option(const char *str, int len, void *arg)
{
#define SET_WHEN_DUMP(bit) SET_WHEN(#bit, DUMP_BIT(bit), str, len)
SET_WHEN_DUMP(insns);
rb_warn("don't know how to dump `%.*s', (insns)", len, str);
}
static int
proc_options(int argc, char **argv, struct cmdline_options *opt)
{
int n, argc0 = argc;
const char *s;
if (argc == 0)
return 0;
for (argc--, argv++; argc > 0; argc--, argv++) {
if (argv[0][0] != '-' || !argv[0][1])
break;
s = argv[0] + 1;
reswitch:
switch (*s) {
case 'a':
opt->do_split = Qtrue;
s++;
goto reswitch;
case 'p':
opt->do_print = Qtrue;
/* through */
case 'n':
opt->do_loop = Qtrue;
s++;
goto reswitch;
case 'd':
ruby_debug = Qtrue;
ruby_verbose = Qtrue;
s++;
goto reswitch;
case 'y':
opt->yydebug = 1;
s++;
goto reswitch;
case 'v':
if (opt->verbose) {
s++;
goto reswitch;
}
ruby_show_version();
opt->verbose = 1;
case 'w':
ruby_verbose = Qtrue;
s++;
goto reswitch;
case 'W':
{
size_t numlen;
int v = 2; /* -W as -W2 */
if (*++s) {
v = scan_oct(s, 1, &numlen);
if (numlen == 0)
v = 1;
s += numlen;
}
switch (v) {
case 0:
ruby_verbose = Qnil;
break;
case 1:
ruby_verbose = Qfalse;
break;
default:
ruby_verbose = Qtrue;
break;
}
}
goto reswitch;
case 'c':
opt->do_check = Qtrue;
s++;
goto reswitch;
case 's':
forbid_setid("-s");
opt->sflag = 1;
s++;
goto reswitch;
case 'h':
usage(origarg.argv[0]);
rb_exit(EXIT_SUCCESS);
break;
case 'l':
opt->do_line = Qtrue;
rb_output_rs = rb_rs;
s++;
goto reswitch;
case 'S':
forbid_setid("-S");
opt->do_search = Qtrue;
s++;
goto reswitch;
case 'e':
forbid_setid("-e");
if (*++s == '\0') {
s = argv[1];
argc--;
argv++;
}
if (s == NULL) {
rb_raise(rb_eRuntimeError, "no code specified for -e");
}
if (opt->e_script == 0) {
opt->e_script = rb_str_new(NULL, 0);
if (opt->script == NULL) {
opt->script = "-e";
}
}
rb_str_cat2(opt->e_script, s);
rb_str_cat2(opt->e_script, "\n");
break;
case 'r':
forbid_setid("-r");
if (*++s != '\0') {
add_modules(s);
}
else if (argv[1]) {
add_modules(argv[1]);
argc--;
argv++;
}
break;
case 'i':
forbid_setid("-i");
ruby_set_inplace_mode(s + 1);
break;
case 'x':
opt->xflag = Qtrue;
s++;
if (*s && chdir(s) < 0) {
rb_fatal("Can't chdir to %s", s);
}
break;
case 'C':
case 'X':
s++;
if (!*s) {
s = argv[1];
argc--, argv++;
}
if (!s || !*s) {
rb_fatal("Can't chdir");
}
if (chdir(s) < 0) {
rb_fatal("Can't chdir to %s", s);
}
break;
case 'F':
if (*++s) {
rb_fs = rb_reg_new(s, strlen(s), 0);
}
break;
case 'E':
if (!*++s) goto next_encoding;
goto encoding;
case 'K':
if (*++s) {
const char *enc_name = 0;
switch (*s) {
case 'E': case 'e':
enc_name = "EUC-JP";
break;
case 'S': case 's':
enc_name = "Windows-31J";
break;
case 'U': case 'u':
enc_name = "UTF-8";
break;
case 'N': case 'n': case 'A': case 'a':
enc_name = "ASCII-8BIT";
break;
}
if (enc_name) {
opt->src.enc.name = rb_str_new2(enc_name);
opt->ext.enc.name = opt->src.enc.name;
}
s++;
}
goto reswitch;
case 'T':
{
size_t numlen;
int v = 1;
if (*++s) {
v = scan_oct(s, 2, &numlen);
if (numlen == 0)
v = 1;
s += numlen;
}
rb_set_safe_level(v);
}
goto reswitch;
case 'I':
forbid_setid("-I");
if (*++s)
ruby_incpush_expand(s);
else if (argv[1]) {
ruby_incpush_expand(argv[1]);
argc--, argv++;
}
break;
case '0':
{
size_t numlen;
int v;
char c;
v = scan_oct(s, 4, &numlen);
s += numlen;
if (v > 0377)
rb_rs = Qnil;
else if (v == 0 && numlen >= 2) {
rb_rs = rb_str_new2("\n\n");
}
else {
c = v & 0xff;
rb_rs = rb_str_new(&c, 1);
}
}
goto reswitch;
case '-':
if (!s[1] || (s[1] == '\r' && !s[2])) {
argc--, argv++;
goto switch_end;
}
s++;
if (strcmp("copyright", s) == 0) {
opt->copyright = 1;
}
else if (strcmp("debug", s) == 0) {
ruby_debug = Qtrue;
ruby_verbose = Qtrue;
}
else if (strncmp("enable", s, n = 6) == 0 &&
(!s[n] || s[n] == '-' || s[n] == '=')) {
if ((s += n + 1)[-1] ? !*s : (!--argc || !(s = *++argv))) {
rb_raise(rb_eRuntimeError, "missing argument for --enable");
}
ruby_each_words(s, enable_option, &opt->disable);
}
else if (strncmp("disable", s, n = 7) == 0 &&
(!s[n] || s[n] == '-' || s[n] == '=')) {
if ((s += n + 1)[-1] ? !*s : (!--argc || !(s = *++argv))) {
rb_raise(rb_eRuntimeError, "missing argument for --disable");
}
ruby_each_words(s, disable_option, &opt->disable);
}
else if (strncmp("encoding", s, n = 8) == 0 && (!s[n] || s[n] == '=')) {
s += n;
if (!*s++) {
next_encoding:
if (!--argc || !(s = *++argv)) {
rb_raise(rb_eRuntimeError, "missing argument for --encoding");
}
}
encoding:
opt->ext.enc.name = rb_str_new2(s);
}
else if (strcmp("version", s) == 0) {
opt->version = 1;
}
else if (strcmp("verbose", s) == 0) {
opt->verbose = 1;
ruby_verbose = Qtrue;
}
else if (strcmp("yydebug", s) == 0) {
opt->yydebug = 1;
}
else if (strncmp("dump", s, n = 4) == 0 && (!s[n] || s[n] == '=')) {
if (!(s += n + 1)[-1] && (!--argc || !(s = *++argv)) && *s != '-') break;
ruby_each_words(s, dump_option, &opt->dump);
}
else if (strcmp("help", s) == 0) {
usage(origarg.argv[0]);
rb_exit(EXIT_SUCCESS);
}
else if (strcmp("emit-llvm", s) == 0) {
// This option is not documented and only used by macrubyc.
// Users should use macrubyc and never call this option
// directly.
if (argc < 3) {
rb_raise(rb_eRuntimeError,
"expected 2 arguments (output file and init function) for --emit-llvm");
}
ruby_aot_compile = rb_str_new2(argv[1]);
ruby_aot_init_func = rb_str_new2(argv[2]);
GC_RETAIN(ruby_aot_compile);
GC_RETAIN(ruby_aot_init_func);
argc--; argv++;
argc--; argv++;
}
else if (strcmp("uses-bs", s) == 0) {
// This option is not documented and only used by macrubyc.
// Users should use macrubyc and never call this option
// directly.
if (argc < 2) {
rb_raise(rb_eRuntimeError,
"expected 1 argument (complete BridgeSupport file ) for --uses-bs");
}
if (ruby_aot_bs_files == Qnil) {
ruby_aot_bs_files = rb_ary_new();
GC_RETAIN(ruby_aot_bs_files);
}
rb_ary_push(ruby_aot_bs_files, rb_str_new2(argv[1]));
argc--; argv++;
}
else if (strcmp("debug-mode", s) == 0) {
// This option is not documented and only used by macrubyd.
// Users should use macrubyd and never call this option
// directly.
if (argc < 2) {
rb_raise(rb_eRuntimeError,
"expected 1 argument (unix socket path) for --debug-mode");
}
ruby_debug_socket_path = rb_str_new2(argv[1]);
GC_RETAIN(ruby_debug_socket_path);
argc--; argv++;
}
else {
rb_raise(rb_eRuntimeError,
"invalid option --%s (-h will show valid options)", s);
}
break;
case '\r':
if (!s[1])
break;
default:
{
if (ISPRINT(*s)) {
rb_raise(rb_eRuntimeError,
"invalid option -%c (-h will show valid options)",
(int)(unsigned char)*s);
}
else {
rb_raise(rb_eRuntimeError,
"invalid option -\\x%02X (-h will show valid options)",
(int)(unsigned char)*s);
}
}
goto switch_end;
case 0:
break;
}
}
switch_end:
return argc0 - argc;
}
void Init_prelude(void);
static void
ruby_init_gems(int enable)
{
// TODO
}
static rb_encoding *
opt_enc_find(VALUE enc_name)
{
rb_encoding *enc = rb_enc_find(RSTRING_PTR(enc_name));
if (enc == NULL) {
rb_raise(rb_eRuntimeError, "unknown encoding name - %s",
RSTRING_PTR(enc_name));
}
return enc;
}
VALUE rb_argv0;
static rb_encoding *src_encoding;
static VALUE
process_options(VALUE arg)
{
struct cmdline_arguments *argp = (struct cmdline_arguments *)arg;
struct cmdline_options *opt = argp->opt;
int argc = argp->argc;
char **argv = argp->argv;
NODE *tree = 0;
VALUE parser;
rb_encoding *enc, *lenc;
const char *s;
char fbuf[MAXPATHLEN];
int i = proc_options(argc, argv, opt);
int safe;
argc -= i;
argv += i;
if (!(opt->disable & DISABLE_BIT(rubyopt)) &&
rb_safe_level() == 0 && (s = getenv("RUBYOPT"))) {
VALUE src_enc_name = opt->src.enc.name;
VALUE ext_enc_name = opt->ext.enc.name;
while (ISSPACE(*s))
s++;
if (*s == 'T' || (*s == '-' && *(s + 1) == 'T')) {
size_t numlen;
int v = 1;
if (*s != 'T')
++s;
if (*++s) {
v = scan_oct(s, 2, &numlen);
if (numlen == 0)
v = 1;
}
rb_set_safe_level(v);
}
else {
while (s && *s) {
if (*s == '-') {
s++;
if (ISSPACE(*s)) {
do {
s++;
} while (ISSPACE(*s));
continue;
}
}
if (!*s)
break;
if (!strchr("EIdvwWrK", *s))
rb_raise(rb_eRuntimeError,
"invalid switch in RUBYOPT: -%c", *s);
s = moreswitches(s, opt);
}
}
if (src_enc_name)
opt->src.enc.name = src_enc_name;
if (ext_enc_name)
opt->ext.enc.name = ext_enc_name;
}
if (!ruby_aot_compile) {
rb_vm_init_jit();
}
if (opt->version) {
ruby_show_version();
return Qtrue;
}
if (opt->copyright) {
ruby_show_copyright();
}
if (rb_safe_level() >= 4) {
OBJ_TAINT(rb_argv);
OBJ_TAINT(rb_vm_load_path());
}
if (!opt->e_script) {
if (argc == 0) { /* no more args */
if (opt->verbose)
return Qtrue;
opt->script = "-";
}
else {
opt->script = argv[0];
if (opt->script[0] == '\0') {
opt->script = "-";
}
else if (opt->do_search) {
char *path = getenv("RUBYPATH");
opt->script = 0;
if (path) {
opt->script = dln_find_file_r(argv[0], path, fbuf, sizeof(fbuf));
}
if (!opt->script) {
opt->script = dln_find_file_r(argv[0], getenv(PATH_ENV), fbuf, sizeof(fbuf));
}
if (!opt->script)
opt->script = argv[0];
}
argc--;
argv++;
}
}
ruby_script(opt->script);
GC_WB(&opt->script_name, rb_str_new4(rb_progname));
opt->script = RSTRING_PTR(opt->script_name);
ruby_set_argv(argc, argv);
process_sflag(opt);
ruby_init_loadpath();
safe = rb_safe_level();
rb_set_safe_level_force(0);
ruby_init_gems(!(opt->disable & DISABLE_BIT(gems)));
lenc = rb_locale_encoding();
parser = rb_parser_new();
if (opt->yydebug) rb_parser_set_yydebug(parser, Qtrue);
if (opt->ext.enc.name != 0) {
opt->ext.enc.enc = opt_enc_find(opt->ext.enc.name);
}
if (opt->src.enc.name != 0) {
opt->src.enc.enc = opt_enc_find(opt->src.enc.name);
src_encoding = opt->src.enc.enc;
}
if (opt->ext.enc.enc != NULL) {
enc = opt->ext.enc.enc;
}
else {
enc = lenc;
}
rb_enc_set_default_external(rb_enc_from_encoding(enc));
rb_set_safe_level_force(safe);
if (opt->e_script) {
rb_encoding *eenc;
if (opt->src.enc.enc != NULL) {
eenc = opt->src.enc.enc;
}
else {
eenc = lenc;
}
//require_libraries();
tree = rb_parser_compile_string(parser, opt->script, opt->e_script, 1);
}
else {
if (opt->script[0] == '-' && !opt->script[1]) {
forbid_setid("program input from stdin");
}
tree = load_file(parser, opt->script, 1, opt);
}
if (!tree) return Qfalse;
process_sflag(opt);
opt->xflag = 0;
if (rb_safe_level() >= 4) {
OBJ_TAINT(rb_argv);
OBJ_TAINT(rb_vm_load_path());
}
if (opt->do_check) {
printf("Syntax OK\n");
return Qtrue;
}
if (opt->do_print) {
tree = rb_parser_append_print(parser, tree);
}
if (opt->do_loop) {
tree = rb_parser_while_loop(parser, tree, opt->do_line, opt->do_split);
}
return (VALUE)tree;
}
static NODE *
load_file(VALUE parser, const char *fname, int script,
struct cmdline_options *opt)
{
extern VALUE rb_stdin;
VALUE f;
int line_start = 1;
NODE *tree = 0;
rb_encoding *enc;
if (fname == NULL) {
rb_load_fail(fname);
}
if (strcmp(fname, "-") == 0) {
f = rb_stdin;
}
else {
int fd, mode = O_RDONLY;
if ((fd = open(fname, mode)) < 0) {
rb_load_fail(fname);