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