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1 | /* dynl.c - dynamic linking |
2 | * | |
3 | * Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2, or (at your option) | |
8 | * any later version. | |
9 | * | |
10 | * This program 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 | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this software; see the file COPYING. If not, write to | |
17 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | * | |
19 | * As a special exception, the Free Software Foundation gives permission | |
20 | * for additional uses of the text contained in its release of GUILE. | |
21 | * | |
22 | * The exception is that, if you link the GUILE library with other files | |
23 | * to produce an executable, this does not by itself cause the | |
24 | * resulting executable to be covered by the GNU General Public License. | |
25 | * Your use of that executable is in no way restricted on account of | |
26 | * linking the GUILE library code into it. | |
27 | * | |
28 | * This exception does not however invalidate any other reasons why | |
29 | * the executable file might be covered by the GNU General Public License. | |
30 | * | |
31 | * This exception applies only to the code released by the | |
32 | * Free Software Foundation under the name GUILE. If you copy | |
33 | * code from other Free Software Foundation releases into a copy of | |
34 | * GUILE, as the General Public License permits, the exception does | |
35 | * not apply to the code that you add in this way. To avoid misleading | |
36 | * anyone as to the status of such modified files, you must delete | |
37 | * this exception notice from them. | |
38 | * | |
39 | * If you write modifications of your own for GUILE, it is your choice | |
40 | * whether to permit this exception to apply to your modifications. | |
41 | * If you do not wish that, delete this exception notice. | |
42 | */ | |
43 | ||
44 | /* "dynl.c" dynamically link&load object files. | |
45 | Author: Aubrey Jaffer | |
46 | Modified for libguile by Marius Vollmer */ | |
47 | ||
48 | #include "_scm.h" | |
49 | ||
50 | /* Converting a list of SCM strings into a argv-style array. You must | |
51 | have ints disabled for the whole lifetime of the created argv (from | |
52 | before MAKE_ARGV_FROM_STRINGLIST until after | |
53 | MUST_FREE_ARGV). Atleast this is was the documentation for | |
54 | MAKARGVFROMSTRS says, it isn't really used that way. | |
55 | ||
56 | This code probably belongs into strings.c */ | |
57 | ||
58 | static char **scm_make_argv_from_stringlist SCM_P ((SCM args, int *argcp, | |
59 | char *subr, int argn)); | |
60 | ||
61 | static char ** | |
62 | scm_make_argv_from_stringlist (args, argcp, subr, argn) | |
63 | SCM args; | |
64 | int *argcp; | |
65 | char *subr; | |
66 | int argn; | |
67 | { | |
68 | char **argv; | |
69 | int argc, i; | |
70 | ||
71 | argc = scm_ilength(args); | |
72 | argv = (char **) scm_must_malloc ((1L+argc)*sizeof(char *), subr); | |
73 | for(i = 0; SCM_NNULLP (args); args = SCM_CDR (args), i++) { | |
74 | size_t len; | |
75 | char *dst, *src; | |
76 | SCM str = SCM_CAR (args); | |
77 | ||
78 | SCM_ASSERT (SCM_NIMP (str) && SCM_ROSTRINGP (str), str, argn, subr); | |
79 | len = 1 + SCM_ROLENGTH (str); | |
80 | dst = (char *) scm_must_malloc ((long)len, subr); | |
81 | src = SCM_ROCHARS (str); | |
82 | while (len--) | |
83 | dst[len] = src[len]; | |
84 | argv[i] = dst; | |
85 | } | |
86 | ||
87 | if (argcp) | |
88 | *argcp = argc; | |
89 | argv[argc] = 0; | |
90 | return argv; | |
91 | } | |
92 | ||
93 | static void scm_must_free_argv SCM_P ((char **argv)); | |
94 | ||
95 | static void | |
96 | scm_must_free_argv(argv) | |
97 | char **argv; | |
98 | { | |
99 | char **av = argv; | |
100 | while(!(*av)) | |
101 | free(*(av++)); | |
102 | free(argv); | |
103 | } | |
104 | ||
105 | /* Coerce an arbitrary readonly-string into a zero-terminated string. | |
106 | */ | |
107 | ||
108 | static SCM scm_coerce_rostring SCM_P ((SCM rostr, char *subr, int argn)); | |
109 | ||
110 | static SCM | |
111 | scm_coerce_rostring (rostr, subr, argn) | |
112 | SCM rostr; | |
113 | char *subr; | |
114 | int argn; | |
115 | { | |
116 | SCM_ASSERT (SCM_NIMP (rostr) && SCM_ROSTRINGP (rostr), rostr, argn, subr); | |
117 | if (SCM_SUBSTRP (rostr)) | |
118 | rostr = scm_makfromstr (SCM_ROCHARS (rostr), SCM_ROLENGTH (rostr), 0); | |
119 | return rostr; | |
120 | } | |
121 | ||
122 | /* Dispatch to the system dependent files | |
123 | */ | |
124 | ||
125 | #ifdef DYNAMIC_LINKING | |
126 | #ifdef HAVE_LIBDL | |
127 | #include "dynl-dl.c" | |
128 | #else | |
129 | #ifdef HAVE_SHL_LOAD | |
130 | #include "dynl-shl.c" | |
131 | #else | |
132 | #ifdef HAVE_DLD | |
133 | #include "dynl-dld.c" | |
134 | #else /* no dynamic linking available */ | |
135 | void | |
136 | scm_init_dynamic_linking () | |
137 | { | |
138 | } | |
139 | #endif | |
140 | #endif | |
141 | #endif | |
142 | #else /* dynamic linking disabled */ | |
143 | void | |
144 | scm_init_dynamic_linking () | |
145 | { | |
146 | } | |
147 | #endif |