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/* $Id: help.c,v 1.1 1995/12/14 06:52:47 tholo Exp $ */
/*-
* Copyright 1987, 1988 by the Student Information Processing Board
* of the Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for any purpose and without fee is
* hereby granted, provided that the above copyright notice
* appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation,
* and 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#ifndef NPOSIX
#include <fcntl.h>
#endif
#include <sys/wait.h>
#include "ss_internal.h"
extern int errno;
void
ss_help (argc, argv, sci_idx, info_ptr)
int argc;
char const * const *argv;
int sci_idx;
pointer info_ptr;
{
char buffer[MAXPATHLEN];
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 */
sprintf(buffer, "usage:\n\t%s [topic|command]\nor\t%s\n",
request_name, request_name);
ss_perror(sci_idx, 0, 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 (idx = 0; info->info_dirs[idx] != (char *)NULL; idx++) {
(void) strcpy(buffer, info->info_dirs[idx]);
(void) strcat(buffer, "/");
(void) strcat(buffer, argv[1]);
(void) strcat(buffer, ".info");
if ((fd = open(&buffer[0], O_RDONLY, 0)) >= 0) goto got_it;
}
if ((fd = open(&buffer[0], O_RDONLY, 0)) < 0) {
char buf[MAXPATHLEN];
strcpy(buf, "No info found for ");
strcat(buf, argv[1]);
ss_perror(sci_idx, 0, buf);
return;
}
got_it:
switch (child = fork()) {
case -1:
ss_perror(sci_idx, errno, "Can't fork for pager");
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? */
#ifndef NPOSIX
while (wait((int *)0) != child) ; /* do nothing if wrong pid */
#else
while (wait((union wait *)0) != child) ; /* do nothing if wrong pid */
#endif
}
}
#include <sys/types.h>
#ifdef NPOSIX
#include <sys/dir.h>
#else
#include <dirent.h>
#endif /* NPOSIX */
void
ss_add_info_dir(sci_idx, info_dir, code_ptr)
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) {
*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) {
info->info_dirs = (char **)NULL;
*code_ptr = errno;
return;
}
info->info_dirs = dirs;
dirs[n_dirs + 1] = (char *)NULL;
dirs[n_dirs] = malloc((unsigned)strlen(info_dir)+1);
strcpy(dirs[n_dirs], info_dir);
*code_ptr = 0;
}
void
ss_delete_info_dir(sci_idx, info_dir, code_ptr)
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;
}
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