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Commit | Line | Data |
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a68b0d31 | 1 | /* You don't really want to know what this hack is for. |
5107cf1d | 2 | Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
afd4eb37 | 3 | This file is part of the GNU C Library. |
a68b0d31 | 4 | |
afd4eb37 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
a68b0d31 | 9 | |
afd4eb37 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
a68b0d31 | 14 | |
afd4eb37 UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
a68b0d31 | 19 | |
175b633d RM |
20 | #include <stdio.h> |
21 | #include <ctype.h> | |
22 | #include <stdlib.h> | |
a68b0d31 | 23 | #include <string.h> |
499e7464 | 24 | #include <unistd.h> |
175b633d RM |
25 | #include <dlfcn.h> |
26 | ||
27 | static void *funcall (char **stringp); | |
28 | static void *eval (char **stringp); | |
29 | ||
30 | static void * | |
31 | funcall (char **stringp) | |
32 | { | |
33 | void *args[strlen (*stringp)], **ap = args; | |
34 | void *argcookie = &args[1]; | |
35 | ||
36 | do | |
37 | { | |
38 | /* Evaluate the next token. */ | |
39 | *ap++ = eval (stringp); | |
40 | ||
41 | /* Whitespace is irrelevant. */ | |
42 | while (isspace (**stringp)) | |
43 | ++*stringp; | |
44 | ||
45 | /* Terminate at closing paren or end of line. */ | |
46 | } while (**stringp != '\0' && **stringp != ')'); | |
47 | if (**stringp != '\0') | |
48 | /* Swallow closing paren. */ | |
49 | ++*stringp; | |
50 | ||
499e7464 UD |
51 | if (args[0] == NULL) |
52 | { | |
53 | static const char unknown[] = "Unknown function\n"; | |
54 | write (1, unknown, sizeof unknown - 1); | |
55 | return NULL; | |
56 | } | |
57 | ||
175b633d RM |
58 | /* Do it to it. */ |
59 | __builtin_return (__builtin_apply (args[0], | |
60 | &argcookie, | |
61 | (char *) ap - (char *) &args[1])); | |
62 | } | |
63 | ||
64 | static void * | |
65 | eval (char **stringp) | |
66 | { | |
67 | void *value; | |
68 | char *p = *stringp, c; | |
69 | ||
70 | /* Whitespace is irrelevant. */ | |
71 | while (isspace (*p)) | |
72 | ++p; | |
73 | ||
74 | switch (*p) | |
75 | { | |
76 | case '"': | |
77 | /* String constant. */ | |
78 | value = ++p; | |
79 | do | |
80 | if (*p == '\\') | |
81 | { | |
82 | switch (*strcpy (p, p + 1)) | |
83 | { | |
84 | case 't': | |
85 | *p = '\t'; | |
86 | break; | |
87 | case 'n': | |
88 | *p = '\n'; | |
89 | break; | |
90 | } | |
91 | ++p; | |
92 | } | |
93 | while (*p != '\0' && *p++ != '"'); | |
94 | if (p[-1] == '"') | |
95 | p[-1] = '\0'; | |
96 | break; | |
97 | ||
98 | case '(': | |
99 | *stringp = ++p; | |
100 | return funcall (stringp); | |
101 | ||
102 | default: | |
103 | /* Try to parse it as a number. */ | |
104 | value = (void *) strtol (p, stringp, 0); | |
105 | if (*stringp != p) | |
106 | return value; | |
107 | ||
108 | /* Anything else is a symbol that produces its address. */ | |
109 | value = p; | |
110 | do | |
111 | ++p; | |
499e7464 | 112 | while (*p != '\0' && !isspace (*p) && (!ispunct (*p) || *p == '_')); |
175b633d RM |
113 | c = *p; |
114 | *p = '\0'; | |
115 | value = dlsym (NULL, value); | |
116 | *p = c; | |
117 | break; | |
118 | } | |
119 | ||
120 | *stringp = p; | |
121 | return value; | |
122 | } | |
123 | ||
124 | ||
125 | void | |
126 | _start (void) | |
127 | { | |
128 | char *buf = NULL; | |
129 | size_t bufsz = 0; | |
130 | ||
5107cf1d | 131 | while (__getdelim (&buf, &bufsz, '\n', stdin) > 0) |
175b633d RM |
132 | { |
133 | char *p = buf; | |
134 | eval (&p); | |
135 | } | |
136 | ||
137 | exit (0); | |
138 | } |