1 /*
2 * Copyright 2003 by MIT Student Information Processing Board
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose is hereby granted, provided that
6 * the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
7 * advertising or publicity pertaining to distribution of the software
8 * without specific, written prior permission. M.I.T. and the
9 * M.I.T. S.I.P.B. make no representations about the suitability of
10 * this software for any purpose. It is provided "as is" without
11 * express or implied warranty.
12 */
13
14 #ifdef HAS_STDLIB_H
15 #include <stdlib.h>
16 #endif
17 #include "ss_internal.h"
18 #define size sizeof(ss_data *)
19 #ifdef HAVE_DLOPEN
20 #include <dlfcn.h>
21 #endif
22
ss_release_readline(ss_data * info)23 static void ss_release_readline(ss_data *info)
24 {
25 #ifdef HAVE_DLOPEN
26 if (!info->readline_handle)
27 return;
28
29 info->readline = 0;
30 info->add_history = 0;
31 info->redisplay = 0;
32 info->rl_completion_matches = 0;
33 dlclose(info->readline_handle);
34 info->readline_handle = 0;
35 #endif
36 }
37
38 /* Libraries we will try to use for readline/editline functionality */
39 #define DEFAULT_LIBPATH "libreadline.so.6:libreadline.so.5:libreadline.so.4:libreadline.so:libedit.so.2:libedit.so:libeditline.so.0:libeditline.so"
40
ss_get_readline(int sci_idx)41 void ss_get_readline(int sci_idx)
42 {
43 #ifdef HAVE_DLOPEN
44 void *handle = NULL;
45 ss_data *info = ss_info(sci_idx);
46 const char **t, *libpath = 0;
47 char *tmp, *cp, *next;
48 char **(**completion_func)(const char *, int, int);
49
50 if (info->readline_handle)
51 return;
52
53 libpath = ss_safe_getenv("SS_READLINE_PATH");
54 if (!libpath)
55 libpath = DEFAULT_LIBPATH;
56 if (*libpath == 0 || !strcmp(libpath, "none"))
57 return;
58
59 tmp = malloc(strlen(libpath)+1);
60 if (!tmp)
61 return;
62 strcpy(tmp, libpath);
63 for (cp = tmp; cp; cp = next) {
64 next = strchr(cp, ':');
65 if (next)
66 *next++ = 0;
67 if (*cp == 0)
68 continue;
69 if ((handle = dlopen(cp, RTLD_NOW))) {
70 /* printf("Using %s for readline library\n", cp); */
71 break;
72 }
73 }
74 free(tmp);
75 if (!handle)
76 return;
77
78 info->readline_handle = handle;
79 info->readline = (char *(*)(const char *))
80 dlsym(handle, "readline");
81 info->add_history = (void (*)(const char *))
82 dlsym(handle, "add_history");
83 info->redisplay = (void (*)(void))
84 dlsym(handle, "rl_forced_update_display");
85 info->rl_completion_matches = (char **(*)(const char *,
86 char *(*)(const char *, int)))
87 dlsym(handle, "rl_completion_matches");
88 if ((t = dlsym(handle, "rl_readline_name")) != NULL)
89 *t = info->subsystem_name;
90 if ((completion_func =
91 dlsym(handle, "rl_attempted_completion_function")) != NULL)
92 *completion_func = ss_rl_completion;
93 info->readline_shutdown = ss_release_readline;
94 #endif
95 }
96
97
98