mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
f4f4caab0e
I wanted a tiny scriptable meltdown proof way to run userspace programs and visualize how program execution impacts memory. It helps to explain how things like Actually Portable Executable works. It can show you how the GCC generated code is going about manipulating matrices and more. I didn't feel fully comfortable with Qemu and Bochs because I'm not smart enough to understand them. I wanted something like gVisor but with much stronger levels of assurances. I wanted a single binary that'll run, on all major operating systems with an embedded GPL barrier ZIP filesystem that is tiny enough to transpile to JavaScript and run in browsers too. https://justine.storage.googleapis.com/emulator625.mp4
140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
asm(".ident\t\"\\n\\n\
|
|
getopt (BSD-3)\\n\
|
|
Copyright 1987, 1993, 1994 The Regents of the University of California\"");
|
|
asm(".include \"libc/disclaimer.inc\"");
|
|
|
|
/* clang-format off */
|
|
/* $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1987, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)getopt.c 8.3 (Berkeley) 4/27/95
|
|
* $FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $
|
|
* $DragonFly: src/lib/libc/stdlib/getopt.c,v 1.7 2005/11/20 12:37:48 swildner Exp $
|
|
*/
|
|
|
|
#include "libc/str/str.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/stdio/stdio.h"
|
|
|
|
STATIC_YOINK("_init_getopt");
|
|
|
|
#define BADCH (int)'?'
|
|
#define BADARG (int)':'
|
|
|
|
int opterr, /* if error message should be printed */
|
|
optind, /* index into parent argv vector */
|
|
optopt, /* character checked for validity */
|
|
optreset; /* reset getopt */
|
|
char *optarg; /* argument associated with option */
|
|
char *getopt_place; /* option letter processing */
|
|
char kGetoptEmsg[1];
|
|
|
|
/*
|
|
* getopt --
|
|
* Parse argc/argv argument vector.
|
|
*/
|
|
int
|
|
getopt(int nargc, char * const nargv[], const char *ostr)
|
|
{
|
|
char *oli; /* option letter list index */
|
|
|
|
/*
|
|
* Some programs like cvs expect optind = 0 to trigger
|
|
* a reset of getopt.
|
|
*/
|
|
if (optind == 0)
|
|
optind = 1;
|
|
|
|
if (optreset || *getopt_place == 0) { /* update scanning pointer */
|
|
optreset = 0;
|
|
getopt_place = nargv[optind];
|
|
if (optind >= nargc || *getopt_place++ != '-') {
|
|
/* Argument is absent or is not an option */
|
|
getopt_place = kGetoptEmsg;
|
|
return (-1);
|
|
}
|
|
optopt = *getopt_place++;
|
|
if (optopt == '-' && *getopt_place == 0) {
|
|
/* "--" => end of options */
|
|
++optind;
|
|
getopt_place = kGetoptEmsg;
|
|
return (-1);
|
|
}
|
|
if (optopt == 0) {
|
|
/* Solitary '-', treat as a '-' option
|
|
if the program (eg su) is looking for it. */
|
|
getopt_place = kGetoptEmsg;
|
|
if (strchr(ostr, '-') == NULL)
|
|
return (-1);
|
|
optopt = '-';
|
|
}
|
|
} else
|
|
optopt = *getopt_place++;
|
|
|
|
/* See if option letter is one the caller wanted... */
|
|
if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
|
|
if (*getopt_place == 0)
|
|
++optind;
|
|
if (opterr && *ostr != ':')
|
|
fprintf(stderr,
|
|
"%s: illegal option -- %c\n", program_invocation_name,
|
|
optopt);
|
|
return (BADCH);
|
|
}
|
|
|
|
/* Does this option need an argument? */
|
|
if (oli[1] != ':') {
|
|
/* don't need argument */
|
|
optarg = NULL;
|
|
if (*getopt_place == 0)
|
|
++optind;
|
|
} else {
|
|
/* Option-argument is either the rest of this argument or the
|
|
entire next argument. */
|
|
if (*getopt_place)
|
|
optarg = getopt_place;
|
|
else if (nargc > ++optind)
|
|
optarg = nargv[optind];
|
|
else {
|
|
/* option-argument absent */
|
|
getopt_place = kGetoptEmsg;
|
|
if (*ostr == ':')
|
|
return (BADARG);
|
|
if (opterr)
|
|
fprintf(stderr,
|
|
"%s: option requires an argument -- %c\n",
|
|
program_invocation_name, optopt);
|
|
return (BADCH);
|
|
}
|
|
getopt_place = kGetoptEmsg;
|
|
++optind;
|
|
}
|
|
return (optopt); /* return option letter */
|
|
}
|