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guile/libguile/script.c
Thien-Thi Nguyen b88c22e916 Update copyright. 
Remove face-lift comment; nfc.
2002-05-04 02:22:11 +00:00

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/* Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* "script.c" argv tricks for `#!' scripts.
Authors: Aubrey Jaffer and Jim Blandy */
#include <stdio.h>
#include <ctype.h>
#include "libguile/_scm.h"
#include "libguile/gh.h"
#include "libguile/load.h"
#include "libguile/version.h"
#include "libguile/script.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for X_OK define */
#endif
/* Concatentate str2 onto str1 at position n and return concatenated
string if file exists; 0 otherwise. */
static char *
scm_cat_path (char *str1, const char *str2, long n)
{
if (!n)
n = strlen (str2);
if (str1)
{
long len = strlen (str1);
str1 = (char *) realloc (str1, (scm_sizet) (len + n + 1));
if (!str1)
return 0L;
strncat (str1 + len, str2, n);
return str1;
}
str1 = (char *) malloc ((scm_sizet) (n + 1));
if (!str1)
return 0L;
str1[0] = 0;
strncat (str1, str2, n);
return str1;
}
#if 0
static char *
scm_try_path (char *path)
{
FILE *f;
/* fprintf(stderr, "Trying %s\n", path);fflush(stderr); */
if (!path)
return 0L;
SCM_SYSCALL (f = fopen (path, "r");
);
if (f)
{
fclose (f);
return path;
}
free (path);
return 0L;
}
static char *
scm_sep_init_try (char *path, const char *sep, const char *initname)
{
if (path)
path = scm_cat_path (path, sep, 0L);
if (path)
path = scm_cat_path (path, initname, 0L);
return scm_try_path (path);
}
#endif
#ifndef LINE_INCREMENTORS
#define LINE_INCREMENTORS '\n'
#ifdef MSDOS
#define WHITE_SPACES ' ':case '\t':case '\r':case '\f':case 26
#else
#define WHITE_SPACES ' ':case '\t':case '\r':case '\f'
#endif /* def MSDOS */
#endif /* ndef LINE_INCREMENTORS */
#ifndef MAXPATHLEN
#define MAXPATHLEN 80
#endif /* ndef MAXPATHLEN */
#ifndef X_OK
#define X_OK 1
#endif /* ndef X_OK */
char *
scm_find_executable (const char *name)
{
char tbuf[MAXPATHLEN];
int i = 0;
FILE *f;
/* fprintf(stderr, "s_f_e checking access %s ->%d\n", name, access(name, X_OK)); fflush(stderr); */
if (access (name, X_OK))
return 0L;
f = fopen (name, "r");
if (!f)
return 0L;
if ((fgetc (f) == '#') && (fgetc (f) == '!'))
{
while (1)
switch (tbuf[i++] = fgetc (f))
{
case /*WHITE_SPACES */ ' ':
case '\t':
case '\r':
case '\f':
case EOF:
tbuf[--i] = 0;
fclose (f);
return scm_cat_path (0L, tbuf, 0L);
}
}
fclose (f);
return scm_cat_path (0L, name, 0L);
}
/* Read a \nnn-style escape. We've just read the backslash. */
static int
script_get_octal (FILE *f)
{
int i;
int value = 0;
for (i = 0; i < 3; i++)
{
int c = getc (f);
if ('0' <= c && c <= '7')
value = (value * 8) + (c - '0');
else
scm_wta (SCM_UNDEFINED,
"malformed script: bad octal backslash escape",
"script argument parser");
}
return value;
}
static int
script_get_backslash (FILE *f)
{
int c = getc (f);
switch (c)
{
case 'a': return '\a';
case 'b': return '\b';
case 'f': return '\f';
case 'n': return '\n';
case 'r': return '\r';
case 't': return '\t';
case 'v': return '\v';
case '\\':
case ' ':
case '\t':
case '\n':
return c;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
ungetc (c, f);
return script_get_octal (f);
case EOF:
scm_wta (SCM_UNDEFINED,
"malformed script: backslash followed by EOF",
"script argument parser");
return 0; /* not reached? */
default:
scm_wta (SCM_UNDEFINED,
"malformed script: bad backslash sequence",
"script argument parser");
return 0; /* not reached? */
}
}
static char *
script_read_arg (FILE *f)
{
int size = 7;
char *buf = malloc (size + 1);
int len = 0;
if (! buf)
return 0;
for (;;)
{
int c = getc (f);
switch (c)
{
case '\\':
c = script_get_backslash (f);
/* The above produces a new character to add to the argument.
Fall through. */
default:
if (len >= size)
{
size = (size + 1) * 2;
buf = realloc (buf, size);
if (! buf)
return 0;
}
buf[len++] = c;
break;
case '\n':
/* This may terminate an arg now, but it will terminate the
entire list next time through. */
ungetc ('\n', f);
case EOF:
if (len == 0)
{
free (buf);
return 0;
}
/* Otherwise, those characters terminate the argument; fall
through. */
case ' ':
buf[len] = '\0';
return buf;
case '\t':
free (buf);
scm_wta (SCM_UNDEFINED,
"malformed script: TAB in meta-arguments",
"argument parser");
return 0; /* not reached? */
}
}
}
static int
script_meta_arg_P (char *arg)
{
if ('\\' != arg[0])
return 0L;
#ifdef MSDOS
return !arg[1];
#else
switch (arg[1])
{
case 0:
case '%':
case WHITE_SPACES:
return !0;
default:
return 0L;
}
#endif
}
char **
scm_get_meta_args (int argc, char **argv)
{
int nargc = argc, argi = 1, nargi = 1;
char *narg, **nargv;
if (!(argc > 2 && script_meta_arg_P (argv[1])))
return 0L;
if (!(nargv = (char **) malloc ((1 + nargc) * sizeof (char *))))
return 0L;
nargv[0] = argv[0];
while (((argi + 1) < argc) && (script_meta_arg_P (argv[argi])))
{
FILE *f = fopen (argv[++argi], "r");
if (f)
{
nargc--; /* to compensate for replacement of '\\' */
while (1)
switch (getc (f))
{
case EOF:
return 0L;
default:
continue;
case '\n':
goto found_args;
}
found_args:
while ((narg = script_read_arg (f)))
if (!(nargv = (char **) realloc (nargv,
(1 + ++nargc) * sizeof (char *))))
return 0L;
else
nargv[nargi++] = narg;
fclose (f);
nargv[nargi++] = argv[argi++];
}
}
while (argi <= argc)
nargv[nargi++] = argv[argi++];
return nargv;
}
int
scm_count_argv (char **argv)
{
int argc = 0;
while (argv[argc])
argc++;
return argc;
}
/* For use in error messages. */
char *scm_usage_name = 0;
void
scm_shell_usage (int fatal, char *message)
{
if (message)
fprintf (stderr, "%s\n", message);
fprintf (stderr,
"Usage: %s OPTION ...\n"
"Evaluate Scheme code, interactively or from a script.\n"
"\n"
" -s SCRIPT load Scheme source code from FILE, and exit\n"
" -c EXPR evalute Scheme expression EXPR, and exit\n"
" -- stop scanning arguments; run interactively\n"
"The above switches stop argument processing, and pass all\n"
"remaining arguments as the value of (command-line).\n"
"\n"
" -l FILE load Scheme source code from FILE\n"
" -e FUNCTION after reading script, apply FUNCTION to\n"
" command line arguments\n"
" -ds do -s script at this point\n"
" --debug start with debugging evaluator and backtraces\n"
" -q inhibit loading of user init file\n"
" --emacs enable Emacs protocol (experimental)\n"
" -h, --help display this help and exit\n"
" -v, --version display version information and exit\n"
" \\ read arguments from following script lines\n",
scm_usage_name);
if (fatal)
exit (fatal);
}
/* Some symbols used by the command-line compiler. */
SCM_SYMBOL (sym_load, "load");
SCM_SYMBOL (sym_eval_string, "eval-string");
SCM_SYMBOL (sym_command_line, "command-line");
SCM_SYMBOL (sym_begin, "begin");
SCM_SYMBOL (sym_load_user_init, "load-user-init");
SCM_SYMBOL (sym_top_repl, "top-repl");
SCM_SYMBOL (sym_quit, "quit");
/* Given an array of command-line switches, return a Scheme expression
to carry out the actions specified by the switches.
If you told me this should have been written in Scheme, I'd
probably agree. I'd say I didn't feel comfortable doing that in
the present system. You'd say, well, fix the system so you are
comfortable doing that. I'd agree again. *shrug*
We load the ice-9 system from here. It might be nicer if the
libraries initialized from the inner_main function in guile.c (which
will be auto-generated eventually) could assume ice-9 were already
loaded. Then again, it might be nice if ice-9 could assume that
certain libraries were already loaded. The solution is to break up
ice-9 into modules which can be frozen and statically linked like any
other module. Then all the modules can describe their dependencies in
the usual way, and the auto-generated inner_main will do the right
thing. */
static char guile[] = "guile";
SCM
scm_compile_shell_switches (int argc, char **argv)
{
SCM tail = SCM_EOL; /* We accumulate the list backwards,
and then reverse! it before we
return it. */
SCM do_script = SCM_EOL; /* The element of the list containing
the "load" command, in case we get
the "-ds" switch. */
SCM entry_point = SCM_EOL; /* for -e switch */
int interactive = 1; /* Should we go interactive when done? */
int inhibit_user_init = 0; /* Don't load user init file */
int use_emacs_interface = 0;
int i;
char *argv0 = guile;
if (argc > 0)
{
argv0 = argv[0];
scm_usage_name = strrchr (argv[0], '/');
if (! scm_usage_name)
scm_usage_name = argv[0];
else
scm_usage_name++;
}
if (! scm_usage_name)
scm_usage_name = guile;
for (i = 1; i < argc; i++)
{
if (! strcmp (argv[i], "-s")) /* load script */
{
if (++i >= argc)
scm_shell_usage (1, "missing argument to `-s' switch");
/* If we specified the -ds option, do_script points to the
cdr of an expression like (load #f); we replace the car
(i.e., the #f) with the script name. */
if (!SCM_NULLP (do_script))
{
SCM_SETCAR (do_script, scm_makfrom0str (argv[i]));
do_script = SCM_EOL;
}
else
/* Construct an application of LOAD to the script name. */
tail = scm_cons (scm_cons2 (sym_load,
scm_makfrom0str (argv[i]),
SCM_EOL),
tail);
argv0 = argv[i];
i++;
interactive = 0;
break;
}
else if (! strcmp (argv[i], "-c")) /* evaluate expr */
{
if (++i >= argc)
scm_shell_usage (1, "missing argument to `-c' switch");
tail = scm_cons (scm_cons2 (sym_eval_string,
scm_makfrom0str (argv[i]),
SCM_EOL),
tail);
i++;
interactive = 0;
break;
}
else if (! strcmp (argv[i], "--")) /* end args; go interactive */
{
i++;
break;
}
else if (! strcmp (argv[i], "-l")) /* load a file */
{
if (++i < argc)
tail = scm_cons (scm_cons2 (sym_load,
scm_makfrom0str (argv[i]),
SCM_EOL),
tail);
else
scm_shell_usage (1, "missing argument to `-l' switch");
}
else if (! strcmp (argv[i], "-e")) /* entry point */
{
if (++i < argc)
entry_point = gh_symbol2scm (argv[i]);
else
scm_shell_usage (1, "missing argument to `-e' switch");
}
else if (! strcmp (argv[i], "-ds")) /* do script here */
{
/* We put a dummy "load" expression, and let the -s put the
filename in. */
if (!SCM_NULLP (do_script))
scm_shell_usage (1, "the -ds switch may only be specified once");
do_script = scm_cons (SCM_BOOL_F, SCM_EOL);
tail = scm_cons (scm_cons (sym_load, do_script),
tail);
}
else if (! strcmp (argv[i], "--debug")) /* debug eval + backtraces */
{
SCM_DEVAL_P = 1;
SCM_BACKTRACE_P = 1;
SCM_RECORD_POSITIONS_P = 1;
SCM_RESET_DEBUG_MODE;
}
else if (! strcmp (argv[i], "--emacs")) /* use emacs protocol */
use_emacs_interface = 1;
else if (! strcmp (argv[i], "-q")) /* don't load user init */
inhibit_user_init = 1;
else if (! strcmp (argv[i], "-h")
|| ! strcmp (argv[i], "--help"))
{
scm_shell_usage (0, 0);
exit (0);
}
else if (! strcmp (argv[i], "-v")
|| ! strcmp (argv[i], "--version"))
{
/* Print version number. */
printf ("Guile %s\n"
"Copyright (c) 1995, 1996, 1997, 2000, 2002 Free Software Foundation\n"
"Guile may be distributed under the terms of the GNU General Public Licence;\n"
"certain other uses are permitted as well. For details, see the file\n"
"`COPYING', which is included in the Guile distribution.\n"
"There is no warranty, to the extent permitted by law.\n",
SCM_CHARS (scm_version ()));
exit (0);
}
else
{
fprintf (stderr, "%s: Unrecognized switch `%s'\n",
scm_usage_name, argv[i]);
scm_shell_usage (1, 0);
}
}
/* Check to make sure the -ds got a -s. */
if (!SCM_NULLP (do_script))
scm_shell_usage (1, "the `-ds' switch requires the use of `-s' as well");
/* Make any remaining arguments available to the
script/command/whatever. */
scm_set_program_arguments (argc ? argc - i : 0, argv + i, argv0);
/* If the --emacs switch was set, now is when we process it. */
{
SCM vcell = scm_sysintern0_no_module_lookup ("use-emacs-interface");
SCM_SETCDR (vcell, SCM_BOOL(use_emacs_interface));
}
/* Handle the `-e' switch, if it was specified. */
if (!SCM_NULLP (entry_point))
tail = scm_cons (scm_cons2 (entry_point,
scm_cons (sym_command_line, SCM_EOL),
SCM_EOL),
tail);
/* If we didn't end with a -c or a -s, start the repl. */
if (interactive)
{
tail = scm_cons (scm_cons (sym_top_repl, SCM_EOL), tail);
}
else
{
/* After doing all the other actions prescribed by the command line,
quit. */
tail = scm_cons (scm_cons (sym_quit, SCM_EOL),
tail);
/* Allow asyncs (signal handlers etc.) to be run. */
scm_mask_ints = 0;
}
/* After the following line, actions will be added to the front. */
tail = scm_reverse_x (tail, SCM_UNDEFINED);
/* If we didn't end with a -c or a -s and didn't supply a -q, load
the user's customization file. */
if (interactive && !inhibit_user_init)
{
tail = scm_cons (scm_cons (sym_load_user_init, SCM_EOL), tail);
}
{
SCM val = scm_cons (sym_begin, tail);
#if 0
scm_write (val, SCM_UNDEFINED);
scm_newline (SCM_UNDEFINED);
#endif
return val;
}
}
void
scm_shell (int argc, char **argv)
{
/* If present, add SCSH-style meta-arguments from the top of the
script file to the argument vector. See the SCSH manual: "The
meta argument" for more details. */
{
char **new_argv = scm_get_meta_args (argc, argv);
if (new_argv)
{
argv = new_argv;
argc = scm_count_argv (new_argv);
}
}
exit (scm_exit_status (scm_eval_x (scm_compile_shell_switches (argc,argv))));
}
void
scm_init_script ()
{
#include "libguile/script.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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