1 /*
2 * Copyright 1987, 1988 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 #include "config.h"
15 #ifdef HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #ifdef HAVE_STDLIB_H
19 #include <stdlib.h>
20 #endif
21 #ifdef HAVE_ERRNO_H
22 #include <errno.h>
23 #else
24 extern int errno;
25 #endif
26 #include <fcntl.h>
27 #include <sys/param.h>
28 #include <sys/types.h>
29 #include <sys/file.h>
30 #ifdef NEED_SYS_FCNTL_H
31 /* just for O_* */
32 #include <sys/fcntl.h>
33 #endif
34 #ifdef HAVE_SYS_WAIT_H
35 #include <sys/wait.h>
36 #endif
37 #include "ss_internal.h"
38
ss_help(int argc,char const * const * argv,int sci_idx,pointer info_ptr)39 void ss_help(int argc, char const * const *argv, int sci_idx, pointer info_ptr)
40 {
41 char *buffer;
42 char const *request_name;
43 int code;
44 int fd, child;
45 register int idx;
46 register ss_data *info;
47
48 request_name = ss_current_request(sci_idx, &code);
49 if (code != 0) {
50 ss_perror(sci_idx, code, "");
51 return; /* no ss_abort_line, if invalid invocation */
52 }
53 if (argc == 1) {
54 ss_list_requests(argc, argv, sci_idx, info_ptr);
55 return;
56 }
57 else if (argc != 2) {
58 /* should do something better than this */
59 buffer = malloc(80+2*strlen(request_name));
60 if (!buffer) {
61 ss_perror(sci_idx, 0,
62 "couldn't allocate memory to print usage message");
63 return;
64 }
65 sprintf(buffer, "usage:\n\t%s [topic|command]\nor\t%s\n",
66 request_name, request_name);
67 ss_perror(sci_idx, 0, buffer);
68 free(buffer);
69 return;
70 }
71 info = ss_info(sci_idx);
72 if (info->info_dirs == (char **)NULL) {
73 ss_perror(sci_idx, SS_ET_NO_INFO_DIR, (char *)NULL);
74 return;
75 }
76 if (info->info_dirs[0] == (char *)NULL) {
77 ss_perror(sci_idx, SS_ET_NO_INFO_DIR, (char *)NULL);
78 return;
79 }
80 for (fd = -1, idx = 0; info->info_dirs[idx] != (char *)NULL; idx++) {
81 buffer = malloc(strlen (info->info_dirs[idx]) + 1 +
82 strlen (argv[1]) + 6);
83 if (!buffer) {
84 ss_perror(sci_idx, 0,
85 "couldn't allocate memory for help filename");
86 return;
87 }
88 (void) strcpy(buffer, info->info_dirs[idx]);
89 (void) strcat(buffer, "/");
90 (void) strcat(buffer, argv[1]);
91 (void) strcat(buffer, ".info");
92 fd = open(buffer, O_RDONLY);
93 free(buffer);
94 if (fd >= 0)
95 break;
96 }
97 if (fd < 0) {
98 #define MSG "No info found for "
99 char *buf = malloc(strlen (MSG) + strlen (argv[1]) + 1);
100 strcpy(buf, MSG);
101 strcat(buf, argv[1]);
102 ss_perror(sci_idx, 0, buf);
103 free(buf);
104 return;
105 }
106 switch (child = fork()) {
107 case -1:
108 ss_perror(sci_idx, errno, "Can't fork for pager");
109 (void) close(fd);
110 return;
111 case 0:
112 (void) dup2(fd, 0); /* put file on stdin */
113 ss_page_stdin();
114 default:
115 (void) close(fd); /* what can we do if it fails? */
116 while (wait(NULL) != child) {
117 /* do nothing if wrong pid */
118 };
119 }
120 }
121
122 #ifndef HAVE_DIRENT_H
123 #include <sys/dir.h>
124 #else
125 #include <dirent.h>
126 #endif
127
ss_add_info_dir(int sci_idx,char * info_dir,int * code_ptr)128 void ss_add_info_dir(int sci_idx, char *info_dir, int *code_ptr)
129 {
130 register ss_data *info;
131 DIR *d;
132 int n_dirs;
133 register char **dirs;
134
135 info = ss_info(sci_idx);
136 if (info_dir == NULL || *info_dir == '\0') {
137 *code_ptr = SS_ET_NO_INFO_DIR;
138 return;
139 }
140 if ((d = opendir(info_dir)) == (DIR *)NULL) {
141 *code_ptr = errno;
142 return;
143 }
144 closedir(d);
145 dirs = info->info_dirs;
146 for (n_dirs = 0; dirs[n_dirs] != (char *)NULL; n_dirs++)
147 ; /* get number of non-NULL dir entries */
148 dirs = (char **)realloc((char *)dirs,
149 (unsigned)(n_dirs + 2)*sizeof(char *));
150 if (dirs == (char **)NULL) {
151 info->info_dirs = (char **)NULL;
152 *code_ptr = errno;
153 return;
154 }
155 info->info_dirs = dirs;
156 dirs[n_dirs + 1] = (char *)NULL;
157 dirs[n_dirs] = malloc((unsigned)strlen(info_dir)+1);
158 strcpy(dirs[n_dirs], info_dir);
159 *code_ptr = 0;
160 }
161
ss_delete_info_dir(int sci_idx,char * info_dir,int * code_ptr)162 void ss_delete_info_dir(int sci_idx, char *info_dir, int *code_ptr)
163 {
164 register char **i_d;
165 register char **info_dirs;
166
167 info_dirs = ss_info(sci_idx)->info_dirs;
168 for (i_d = info_dirs; *i_d; i_d++) {
169 if (!strcmp(*i_d, info_dir)) {
170 while (*i_d) {
171 *i_d = *(i_d+1);
172 i_d++;
173 }
174 *code_ptr = 0;
175 return;
176 }
177 }
178 *code_ptr = SS_ET_NO_INFO_DIR;
179 }
180