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Amiga Format AFCD07 (Dec 1996, Issue 91).iso
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ixemul-complete
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ixemul
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library
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_cli_parse.c
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1996-08-13
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/*
* This file is part of ixemul.library for the Amiga.
* Copyright (C) 1991, 1992 Markus M. Wild
* Portions (C) 1995 Jeff Shepherd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* _cli_parse.c,v 1.1.1.1 1994/04/04 04:29:41 amiga Exp
*
* _cli_parse.c,v
* Revision 1.1.1.1 1994/04/04 04:29:41 amiga
* Initial CVS check in.
*
* Revision 1.3 1992/08/09 20:41:17 amiga
* change to use 2.x header files by default
*
* Revision 1.2 1992/07/04 19:09:27 mwild
* make stderr (desc 2) *really* read/write, don't just say so...
*
* Revision 1.1 1992/05/14 19:55:40 mwild
* Initial revision
*
*/
/*
* This routine is called from the _main() routine and is used to
* parse the arguments passed from the CLI to the program. It sets
* up an array of pointers to arguments in the global variables and
* and sets up _argc and _argv which will be passed by _main() to
* the main() procedure. If no arguments are ever going to be
* parsed, this routine may be replaced by a stub routine to reduce
* program size.
*
*/
#define _KERNEL
#include "ixemul.h"
#include "kprintf.h"
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <glob.h>
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
extern int __read(), __write(), __ioctl(), __fselect(), __close();
/* We will store all arguments in this double linked list, the list
* is always sorted according to elements, ie. order of given arguments
* is preserved, but all elements, that get expanded will be sorted
* alphabetically in this list. */
struct ArgList {
struct MinList al_list; /* the list - head */
long al_num; /* number of arguments in the whole list */
};
struct Argument {
struct MinNode a_node; /* the link in the arg-list */
char *a_arg; /* a malloc'd string, the argument */
};
/* insert a new argument into the argument vector, we have to keep the
* vector sorted, but only element-wise, otherwise we would break the
* order of arguments, and "copy b a" is surely not the same as "copy a b"..
* so we don't scan the whole list, but start with element "start",
* if set, else we start at the list head */
static void
AddArgument (struct ArgList *ArgList,
struct Argument *start, struct Argument *arg, long size)
{
register struct Argument *el, *nel;
/* depending on "start", start scan for right position in list at
* successor of start or at head of list */
for (el = (struct Argument *)
(start ? start->a_node.mln_Succ : ArgList->al_list.mlh_Head);
(nel = (struct Argument *) el->a_node.mln_Succ);
el = nel)
if (strcmp (el->a_arg, arg->a_arg) > 0) break;
Insert ((struct List *) ArgList, (struct Node *) arg, (struct Node *) el);
/* and bump up the argument counter once */
++ ArgList->al_num;
}
/* if an argument contains one or more of these characters, we have to
* call the glob() stuff, else don't bother expanding and
* quickly append to list. Here's the meaning of all these characters, some
* seem to be not widely used:
* * match any number (incl. zero) of characters
* #? match any number (incl. zero) of characters (for Amiga compatibility)
* [] match any character that's contained in the set inside the brackets
* ? match any character (exactly one)
* ! negate the following expression
*/
#define iswild(ch) (index ("*[!?#", ch) ? 1 : 0)
void
_cli_parse(struct Process *this_proc, long alen, char *_aptr,
int *argc, char ***argv)
{
char *arg0;
struct CommandLineInterface *cli;
struct Argument *arg, *narg;
char *line, *next, *lmax, **cpp;
int do_expand;
int arglen;
char *aptr;
struct ArgList ArgList;
int expand_cmd_line = u.u_expand_cmd_line;
struct file *fin, *fout;
int fd;
BPTR fh;
int omask;
KPRINTF (("entered _cli_parse()\n"));
KPRINTF (("command line length = %ld\n", alen));
KPRINTF (("command line = '%s'\n", _aptr));
/* this stuff has been in ix_open before, but it really belongs here, since
* I don't want it to happen by default on OpenLibrary, since it would
* disturb any vfork() that wants to inherit files from its parent
*/
omask = syscall (SYS_sigsetmask, ~0);
if (! falloc (&fin, &fd))
{
/*
* NOTE: if there's an error creating one of the standard
* descriptors, we just go on, the descriptor in
* question will then not be set up, no problem ;-)
*/
if (fd != 0)
ix_warning("allocated stdin is not fd #0!");
if (! falloc (&fout, &fd))
{
if (fd != 1)
ix_warning("allocated stdout is not fd #1!");
if ((fh = Input ()))
{
fin->f_name = "<Standard Input>";
fin->f_fh = (struct FileHandle *)BTOCPTR(fh);
__init_std_packet(&fin->f_sp);
__init_std_packet(&fin->f_select_sp);
__fstat(fin);
fin->f_flags = FREAD | FEXTOPEN;
fin->f_ttyflags = IXTTY_ICRNL;
fin->f_type = DTYPE_FILE;
fin->f_read = __read;
fin->f_write = 0;
fin->f_ioctl = __ioctl;
fin->f_close = __close;
fin->f_select= __fselect;
}
else
{
u.u_ofile[0] = 0;
fin->f_count--;
}
if ((fh = Output ()))
{
fout->f_name = "<Standard Output>";
fout->f_fh = (struct FileHandle *)BTOCPTR(fh);
__init_std_packet(&fout->f_sp);
__init_std_packet(&fout->f_select_sp);
__fstat(fout);
fout->f_flags = FWRITE|FEXTOPEN;
fout->f_ttyflags = IXTTY_OPOST | IXTTY_ONLCR;
fout->f_type = DTYPE_FILE;
fout->f_read = 0;
fout->f_write = __write;
fout->f_ioctl = __ioctl;
fout->f_close = __close;
fout->f_select= __fselect;
}
else
{
u.u_ofile[1] = 0;
fout->f_count--;
}
/* deal with stderr. Seems this was a last minute addition to
dos 2, it's hardly documented, there are no access functions,
nobody seems to know what to do with pr_CES...
If pr_CES is valid, then we use it, otherwise we open the
console. */
fd = -1;
if ((fh = this_proc->pr_CES))
{
struct file *fp;
if (!falloc (&fp, &fd))
{
fp->f_name = "<Standard Error>";
fp->f_fh = (struct FileHandle *)BTOCPTR(fh);
__init_std_packet(&fp->f_sp);
__init_std_packet(&fp->f_select_sp);
__fstat(fp);
fp->f_flags = FREAD|FWRITE|FEXTOPEN;
fp->f_ttyflags = IXTTY_OPOST | IXTTY_ONLCR;
fp->f_type = DTYPE_FILE;
fp->f_read = __read;
fp->f_write = __write;
fp->f_ioctl = __ioctl;
fp->f_close = __close;
fp->f_select= __fselect;
}
}
/* Apparently use of CONSOLE: gave problems with
Emacs, so we continue to use "*" instead. */
/* Here is some more information on this from Joerg Hoehle:
*
* While writing fifolib38_1 I found that console handlers are sent
* ACTION_FIND* packets with names of either "*" or "Console:", depending
* on what the user typed. Old handlers that do not recognize "CONSOLE:"
* will produce strange results which could explain the above problems.
*
* That's the reason why
* echo foo >* (beware of * expansion in a non-AmigaDOS shell)
* works in an Emacs shell buffer, whereas
* echo foo >console:
* won't with fifolib prior to version 38.1.
*
* I believe that programs opening stderr should continue to open "*" for
* compatibility reasons. Opening "CONSOLE:" first and "*" if it fails is
* _not_ a solution: for example, FIFO: (prior to 38.1) accepts the
* Open("CONSOLE:") call, giving a FIFO that can be neither read nor
* written to :-(
*/
if (fd == -1)
fd = syscall(SYS_open, "*", 2);
if (fd > -1 && fd != 2)
{
syscall(SYS_dup2, fd, 2);
syscall(SYS_close, fd);
}
} /* falloc (&fout, &fd) */
} /* falloc (&fin, &fd) */
aptr = alloca (alen + 1);
memcpy(aptr, _aptr, alen + 1);
cli = (struct CommandLineInterface *) BTOCPTR (this_proc->pr_CLI);
arg0 = (char *) BTOCPTR (cli->cli_CommandName);
/* init our argument list */
NewList ((struct List *) &ArgList);
/* lets start humble.. no arguments at all:-)) */
ArgList.al_num = 0;
/* find end of command-line, stupid BCPL-stuff.. line can end
* either with \n or with \0 .. */
for (lmax = aptr; *lmax && *lmax != '\n' && *lmax != '\r'; ++lmax) ;
*lmax = 0;
/* loop over all arguments, expand all */
for (line = aptr, narg = arg = 0; line < lmax; )
{
do_expand = 0;
KPRINTF (("remaining cmd line = '%s'\n", aptr));
/* skip over leading whitespace */
while (isspace (*line)) ++line;
if (line >= lmax)
break;
/* if argument starts with ", don't expand it and remove the " */
if (*line == '\"')
{
KPRINTF (("begin quoted argument at '%s'\n", line));
/* scan for end of quoted argument, this can be either at
* end of argumentline or at a second " */
line++;
next = line;
while (next < lmax && *next != '\"')
{
/* Prevent that the loop terminates due to an escaped quote.
* However, if the character after the quote is a space, then
* it is ambiguous whether or not the quote is escaped or is
* the end of the argument. Consider what happens when you give
* /bin/sh a 'FS=\' argument. This gets passed to ixemul.library
* as "FS=\" <other args> */
if ((*next == '\'' || *next == '\\') && next[1] == '\"')
{
/* in this case we have to shift the whole remaining
* line one position to the left to skip the
* escape-character */
bcopy (next + 1, next, (lmax - next) + 1);
--lmax;
}
++next;
}
*next = 0;
KPRINTF (("got arg '%s'\n", line));
}
else
{
/* strange kind of BCPL-quoting, if you want to get a " thru,
* you have to quote it with a ', eq. HELLO'"WORLD'" will preserve
* the " inside the argument. Since hardly anyone knows this
* "feature", I allow for the more common Unix-like escaping, ie
* \" will give you the same effect as '". */
if ((*line == '\'' || *line == '\\') && line[1] == '\"')
{
KPRINTF (("found escaped quote at '%s'\n", line));
line++;
}
/* plain, vanilla argument.. */
next = line + 1;
/* check, whether we have to run thru the expander, or
* if we rather can just copy over the whole argument */
do_expand = iswild (*line);
/* skip over element and make it 0-terminated .. */
while (next < lmax && !isspace (*next))
{
do_expand |= iswild (*next);
if ((*next == '\'' || *next == '\\') && next[1] == '\"')
{
bcopy (next + 1, next, (lmax - next) + 1);
--lmax;
}
++next;
}
*next = 0;
}
if (expand_cmd_line && do_expand)
{
glob_t g;
char **p;
syscall (SYS_sigsetmask, omask);
syscall (SYS_glob, line,
((ix.ix_flags & ix_unix_pattern_matching_case_sensitive) ? 0 : GLOB_NOCASE) |
((ix.ix_flags & ix_allow_amiga_wildcard) ? GLOB_AMIGA : 0) |
GLOB_NOCHECK, NULL, &g);
omask = syscall (SYS_sigsetmask, ~0);
for (p = g.gl_pathv; *p; p++)
{
arg = (struct Argument *)syscall(SYS_malloc, sizeof(*arg));
arg->a_arg = *p;
AddArgument(&ArgList, narg, arg, strlen(*p));
narg = (struct Argument *) ArgList.al_list.mlh_TailPred;
}
syscall(SYS_free, g.gl_pathv);
}
else /* ! do_expand */
{
/* just add the argument "as is" */
arg = (struct Argument *) syscall (SYS_malloc, sizeof (*arg));
arglen = strlen (line);
arg->a_arg = (char *) syscall (SYS_malloc, arglen+1);
strcpy (arg->a_arg, line);
AddArgument (&ArgList, narg, arg, arglen);
}
narg = (struct Argument *) ArgList.al_list.mlh_TailPred;
line = next + 1;
} /* for */
/* prepend the program name */
arg = (struct Argument *) syscall (SYS_malloc, sizeof (*arg));
/* some stupid shells (like Wsh...) pass the WHOLE path of the
* started program. We simply cut off what we don't want ;-)) */
for (arglen = arg0[0]; arglen; --arglen)
if (arg0[arglen] == ':' || arg0[arglen] == '/')
break;
line = &arg0[arglen+1];
arglen = arg0[0] - arglen;
arg->a_arg = (char *) syscall (SYS_malloc, arglen + 1);
strncpy (arg->a_arg, line, arglen);
arg->a_arg[arglen] = 0;
/* did I tell you, that I like those kernel list calls ?? */
AddHead ((struct List*) &ArgList, (struct Node*) arg);
++ ArgList.al_num;
/* build _argv array */
*argv = (char **) syscall (SYS_malloc, (ArgList.al_num+1) * sizeof(char *));
for (cpp = *argv, arg = (struct Argument *) ArgList.al_list.mlh_Head;
(narg = (struct Argument *) arg->a_node.mln_Succ);
arg = narg)
*cpp++ = arg->a_arg;
/* guarantee last element == 0 */
*cpp = 0;
KPRINTF_ARGV ("argv", *argv);
*argc = ArgList.al_num;
if (u.u_ixnetbase)
{
int daemon = netcall(NET_init_inet_daemon, argc, argv);
if (daemon >= 0)
set_socket_stdio(daemon);
}
KPRINTF (("argc = %ld\n", *argc));
KPRINTF (("leaving _cli_parse()\n"));
syscall (SYS_sigsetmask, omask);
}