139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/* You don't really want to know what this hack is for.
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <dlfcn.h>
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static void *funcall (char **stringp);
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static void *eval (char **stringp);
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static void *
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funcall (char **stringp)
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{
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void *args[strlen (*stringp)], **ap = args;
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void *argcookie = &args[1];
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do
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{
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/* Evaluate the next token. */
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*ap++ = eval (stringp);
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/* Whitespace is irrelevant. */
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while (isspace (**stringp))
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++*stringp;
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/* Terminate at closing paren or end of line. */
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} while (**stringp != '\0' && **stringp != ')');
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if (**stringp != '\0')
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/* Swallow closing paren. */
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++*stringp;
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if (args[0] == NULL)
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{
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static const char unknown[] = "Unknown function\n";
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write (1, unknown, sizeof unknown - 1);
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return NULL;
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}
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/* Do it to it. */
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__builtin_return (__builtin_apply (args[0],
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&argcookie,
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(char *) ap - (char *) &args[1]));
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}
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static void *
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eval (char **stringp)
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{
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void *value;
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char *p = *stringp, c;
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/* Whitespace is irrelevant. */
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while (isspace (*p))
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++p;
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switch (*p)
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{
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case '"':
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/* String constant. */
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value = ++p;
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do
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if (*p == '\\')
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{
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switch (*strcpy (p, p + 1))
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{
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case 't':
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*p = '\t';
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break;
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case 'n':
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*p = '\n';
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break;
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}
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++p;
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}
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while (*p != '\0' && *p++ != '"');
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if (p[-1] == '"')
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p[-1] = '\0';
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break;
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case '(':
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*stringp = ++p;
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return funcall (stringp);
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default:
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/* Try to parse it as a number. */
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value = (void *) strtol (p, stringp, 0);
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if (*stringp != p)
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return value;
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/* Anything else is a symbol that produces its address. */
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value = p;
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do
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++p;
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while (*p != '\0' && !isspace (*p) && (!ispunct (*p) || *p == '_'));
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c = *p;
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*p = '\0';
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value = dlsym (NULL, value);
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*p = c;
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break;
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}
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*stringp = p;
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return value;
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}
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void
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_start (void)
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{
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char *buf = NULL;
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size_t bufsz = 0;
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while (__getdelim (&buf, &bufsz, '\n', stdin) > 0)
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{
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char *p = buf;
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eval (&p);
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}
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exit (0);
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}
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