1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* Copyright 1987, 1988 by MIT Student Information Processing Board
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose is hereby granted, provided that
* the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. M.I.T. and the
* M.I.T. S.I.P.B. make no representations about the suitability of
* this software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#include "config.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/file.h>
#ifdef NEED_SYS_FCNTL_H
/* just for O_* */
#include <sys/fcntl.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include "ss_internal.h"
void ss_help(int argc, char const * const *argv, int sci_idx, pointer info_ptr)
{
char *buffer;
char const *request_name;
int code;
int fd, child;
register int idx;
register ss_data *info;
request_name = ss_current_request(sci_idx, &code);
if (code != 0) {
ss_perror(sci_idx, code, "");
return; /* no ss_abort_line, if invalid invocation */
}
if (argc == 1) {
ss_list_requests(argc, argv, sci_idx, info_ptr);
return;
}
else if (argc != 2) {
/* should do something better than this */
buffer = malloc(80+2*strlen(request_name));
if (!buffer) {
ss_perror(sci_idx, 0,
"couldn't allocate memory to print usage message");
return;
}
sprintf(buffer, "usage:\n\t%s [topic|command]\nor\t%s\n",
request_name, request_name);
ss_perror(sci_idx, 0, buffer);
free(buffer);
return;
}
info = ss_info(sci_idx);
if (info->info_dirs == (char **)NULL) {
ss_perror(sci_idx, SS_ET_NO_INFO_DIR, (char *)NULL);
return;
}
if (info->info_dirs[0] == (char *)NULL) {
ss_perror(sci_idx, SS_ET_NO_INFO_DIR, (char *)NULL);
return;
}
for (fd = -1, idx = 0; info->info_dirs[idx] != (char *)NULL; idx++) {
buffer = malloc(strlen (info->info_dirs[idx]) + 1 +
strlen (argv[1]) + 6);
if (!buffer) {
ss_perror(sci_idx, 0,
"couldn't allocate memory for help filename");
return;
}
(void) strcpy(buffer, info->info_dirs[idx]);
(void) strcat(buffer, "/");
(void) strcat(buffer, argv[1]);
(void) strcat(buffer, ".info");
fd = open(buffer, O_RDONLY);
free(buffer);
if (fd >= 0)
break;
}
if (fd < 0) {
#define MSG "No info found for "
char *buf = malloc(strlen (MSG) + strlen (argv[1]) + 1);
if (!buf) {
ss_perror(sci_idx, 0,
"couldn't allocate memory to print error message");
return;
}
strcpy(buf, MSG);
strcat(buf, argv[1]);
ss_perror(sci_idx, 0, buf);
free(buf);
return;
}
switch (child = fork()) {
case -1:
ss_perror(sci_idx, errno, "Can't fork for pager");
(void) close(fd);
return;
case 0:
(void) dup2(fd, 0); /* put file on stdin */
ss_page_stdin();
default:
(void) close(fd); /* what can we do if it fails? */
while (wait(NULL) != child) {
/* do nothing if wrong pid */
};
}
}
#ifndef HAVE_DIRENT_H
#include <sys/dir.h>
#else
#include <dirent.h>
#endif
void ss_add_info_dir(int sci_idx, char *info_dir, int *code_ptr)
{
register ss_data *info;
DIR *d;
int n_dirs;
register char **dirs;
info = ss_info(sci_idx);
if (info_dir == NULL || *info_dir == '\0') {
*code_ptr = SS_ET_NO_INFO_DIR;
return;
}
if ((d = opendir(info_dir)) == (DIR *)NULL) {
*code_ptr = errno;
return;
}
closedir(d);
dirs = info->info_dirs;
for (n_dirs = 0; dirs[n_dirs] != (char *)NULL; n_dirs++)
; /* get number of non-NULL dir entries */
dirs = (char **)realloc((char *)dirs,
(unsigned)(n_dirs + 2)*sizeof(char *));
if (dirs == (char **)NULL) {
*code_ptr = ENOMEM;
return;
}
info->info_dirs = dirs;
dirs[n_dirs + 1] = (char *)NULL;
dirs[n_dirs] = malloc((unsigned)strlen(info_dir)+1);
if (dirs[n_dirs] == (char *)NULL) {
*code_ptr = ENOMEM;
return;
}
strcpy(dirs[n_dirs], info_dir);
*code_ptr = 0;
}
void ss_delete_info_dir(int sci_idx, char *info_dir, int *code_ptr)
{
register char **i_d;
register char **info_dirs;
info_dirs = ss_info(sci_idx)->info_dirs;
for (i_d = info_dirs; *i_d; i_d++) {
if (!strcmp(*i_d, info_dir)) {
while (*i_d) {
*i_d = *(i_d+1);
i_d++;
}
*code_ptr = 0;
return;
}
}
*code_ptr = SS_ET_NO_INFO_DIR;
}
|
