635 lines
15 KiB
C
635 lines
15 KiB
C
/* man.c: How to read and format man files.
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$Id: man.c,v 1.5 1998/03/22 22:35:19 law Exp $
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Copyright (C) 1995, 97 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Written by Brian Fox Thu May 4 09:17:52 1995 (bfox@ai.mit.edu). */
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#include "info.h"
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#include <sys/ioctl.h>
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#include "signals.h"
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#if defined (HAVE_SYS_TIME_H)
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#include <sys/time.h>
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#endif
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#if defined (HAVE_SYS_WAIT_H)
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#include <sys/wait.h>
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#endif
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#include "tilde.h"
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#include "man.h"
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#if !defined (_POSIX_VERSION)
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#define pid_t int
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#endif
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#if defined (FD_SET)
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# if defined (hpux)
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# define fd_set_cast(x) (int *)(x)
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# else
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# define fd_set_cast(x) (fd_set *)(x)
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# endif /* !hpux */
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#endif /* FD_SET */
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static char *read_from_fd ();
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static void clean_manpage ();
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static NODE *manpage_node_of_file_buffer ();
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static char *get_manpage_contents ();
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NODE *
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make_manpage_node (pagename)
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char *pagename;
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{
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return (info_get_node (MANPAGE_FILE_BUFFER_NAME, pagename));
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}
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NODE *
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get_manpage_node (file_buffer, pagename)
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FILE_BUFFER *file_buffer;
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char *pagename;
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{
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NODE *node;
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node = manpage_node_of_file_buffer (file_buffer, pagename);
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if (!node)
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{
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char *page;
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page = get_manpage_contents (pagename);
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if (page)
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{
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char header[1024];
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long oldsize, newsize;
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int hlen, plen;
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sprintf (header, "\n\n%c\n%s %s, %s %s, %s (dir)\n\n",
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INFO_COOKIE,
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INFO_FILE_LABEL, file_buffer->filename,
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INFO_NODE_LABEL, pagename,
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INFO_UP_LABEL);
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oldsize = file_buffer->filesize;
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hlen = strlen (header);
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plen = strlen (page);
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newsize = (oldsize + hlen + plen);
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file_buffer->contents =
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(char *)xrealloc (file_buffer->contents, 1 + newsize);
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memcpy (file_buffer->contents + oldsize, header, hlen);
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oldsize += hlen;
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memcpy (file_buffer->contents + oldsize, page, plen);
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file_buffer->contents[newsize] = '\0';
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file_buffer->filesize = newsize;
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file_buffer->finfo.st_size = newsize;
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build_tags_and_nodes (file_buffer);
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free (page);
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}
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node = manpage_node_of_file_buffer (file_buffer, pagename);
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}
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return (node);
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}
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FILE_BUFFER *
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create_manpage_file_buffer ()
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{
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FILE_BUFFER *file_buffer = make_file_buffer ();
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file_buffer->filename = xstrdup (MANPAGE_FILE_BUFFER_NAME);
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file_buffer->fullpath = xstrdup (MANPAGE_FILE_BUFFER_NAME);
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file_buffer->finfo.st_size = 0;
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file_buffer->filesize = 0;
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file_buffer->contents = (char *)NULL;
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file_buffer->flags = (N_IsInternal | N_CannotGC | N_IsManPage);
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return (file_buffer);
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}
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/* Scan the list of directories in PATH looking for FILENAME. If we find
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one that is an executable file, return it as a new string. Otherwise,
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return a NULL pointer. */
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static char *
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executable_file_in_path (filename, path)
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char *filename, *path;
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{
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struct stat finfo;
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char *temp_dirname;
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int statable, dirname_index;
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dirname_index = 0;
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while ((temp_dirname = extract_colon_unit (path, &dirname_index)))
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{
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char *temp;
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/* Expand a leading tilde if one is present. */
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if (*temp_dirname == '~')
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{
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char *expanded_dirname;
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expanded_dirname = tilde_expand_word (temp_dirname);
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free (temp_dirname);
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temp_dirname = expanded_dirname;
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}
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temp = (char *)xmalloc (30 + strlen (temp_dirname) + strlen (filename));
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strcpy (temp, temp_dirname);
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if (temp[(strlen (temp)) - 1] != '/')
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strcat (temp, "/");
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strcat (temp, filename);
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free (temp_dirname);
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statable = (stat (temp, &finfo) == 0);
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/* If we have found a regular executable file, then use it. */
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if ((statable) && (S_ISREG (finfo.st_mode)) &&
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(access (temp, X_OK) == 0))
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return (temp);
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else
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free (temp);
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}
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return ((char *)NULL);
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}
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/* Return the full pathname of the system man page formatter. */
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static char *
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find_man_formatter ()
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{
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return (executable_file_in_path ("man", (char *)getenv ("PATH")));
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}
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static char *manpage_pagename = (char *)NULL;
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static char *manpage_section = (char *)NULL;
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static void
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get_page_and_section (pagename)
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char *pagename;
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{
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register int i;
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if (manpage_pagename)
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free (manpage_pagename);
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if (manpage_section)
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free (manpage_section);
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manpage_pagename = (char *)NULL;
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manpage_section = (char *)NULL;
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for (i = 0; pagename[i] != '\0' && pagename[i] != '('; i++);
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manpage_pagename = (char *)xmalloc (1 + i);
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strncpy (manpage_pagename, pagename, i);
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manpage_pagename[i] = '\0';
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if (pagename[i] == '(')
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{
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int start;
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start = i + 1;
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for (i = start; pagename[i] != '\0' && pagename[i] != ')'; i++);
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manpage_section = (char *)xmalloc (1 + (i - start));
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strncpy (manpage_section, pagename + start, (i - start));
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manpage_section[i - start] = '\0';
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}
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}
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static void
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reap_children (sig)
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int sig;
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{
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int status;
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wait (&status);
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}
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static char *
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get_manpage_contents (pagename)
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char *pagename;
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{
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static char *formatter_args[4] = { (char *)NULL };
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int pipes[2];
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pid_t child;
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char *formatted_page = (char *)NULL;
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int arg_index = 1;
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if (formatter_args[0] == (char *)NULL)
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formatter_args[0] = find_man_formatter ();
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if (formatter_args[0] == (char *)NULL)
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return ((char *)NULL);
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get_page_and_section (pagename);
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if (manpage_section != (char *)NULL)
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formatter_args[arg_index++] = manpage_section;
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formatter_args[arg_index++] = manpage_pagename;
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formatter_args[arg_index] = (char *)NULL;
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/* Open a pipe to this program, read the output, and save it away
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in FORMATTED_PAGE. The reader end of the pipe is pipes[0]; the
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writer end is pipes[1]. */
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pipe (pipes);
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signal (SIGCHLD, reap_children);
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child = fork ();
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if (child == -1)
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return ((char *)NULL);
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if (child != 0)
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{
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/* In the parent, close the writing end of the pipe, and read from
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the exec'd child. */
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close (pipes[1]);
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formatted_page = read_from_fd (pipes[0]);
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close (pipes[0]);
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}
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else
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{
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/* In the child, close the read end of the pipe, make the write end
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of the pipe be stdout, and execute the man page formatter. */
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close (pipes[0]);
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close (fileno (stderr));
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close (fileno (stdin)); /* Don't print errors. */
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dup2 (pipes[1], fileno (stdout));
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execv (formatter_args[0], formatter_args);
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/* If we get here, we couldn't exec, so close out the pipe and
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exit. */
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close (pipes[1]);
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exit (0);
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}
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/* If we have the page, then clean it up. */
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if (formatted_page)
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clean_manpage (formatted_page);
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return (formatted_page);
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}
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static void
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clean_manpage (manpage)
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char *manpage;
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{
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register int i, j;
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int newline_count = 0;
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char *newpage;
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newpage = (char *)xmalloc (1 + strlen (manpage));
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for (i = 0, j = 0; (newpage[j] = manpage[i]); i++, j++)
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{
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if (manpage[i] == '\n')
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newline_count++;
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else
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newline_count = 0;
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if (newline_count == 3)
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{
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j--;
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newline_count--;
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}
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if (manpage[i] == '\b' || manpage[i] == '\f')
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j -= 2;
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}
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newpage[j++] = '\0';
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strcpy (manpage, newpage);
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free (newpage);
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}
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static NODE *
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manpage_node_of_file_buffer (file_buffer, pagename)
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FILE_BUFFER *file_buffer;
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char *pagename;
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{
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NODE *node = (NODE *)NULL;
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TAG *tag = (TAG *)NULL;
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if (file_buffer->contents)
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{
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register int i;
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for (i = 0; (tag = file_buffer->tags[i]); i++)
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{
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if (strcasecmp (pagename, tag->nodename) == 0)
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break;
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}
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}
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if (tag)
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{
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node = (NODE *)xmalloc (sizeof (NODE));
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node->filename = file_buffer->filename;
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node->nodename = tag->nodename;
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node->contents = file_buffer->contents + tag->nodestart;
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node->nodelen = tag->nodelen;
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node->flags = 0;
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node->parent = (char *)NULL;
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node->flags = (N_HasTagsTable | N_IsManPage);
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node->contents += skip_node_separator (node->contents);
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}
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return (node);
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}
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static char *
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read_from_fd (fd)
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int fd;
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{
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struct timeval timeout;
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char *buffer = (char *)NULL;
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int bsize = 0;
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int bindex = 0;
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int select_result;
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#if defined (FD_SET)
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fd_set read_fds;
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timeout.tv_sec = 15;
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timeout.tv_usec = 0;
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FD_ZERO (&read_fds);
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FD_SET (fd, &read_fds);
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select_result = select (fd + 1, fd_set_cast (&read_fds), 0, 0, &timeout);
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#else /* !FD_SET */
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select_result = 1;
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#endif /* !FD_SET */
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switch (select_result)
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{
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case 0:
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case -1:
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break;
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default:
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{
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int amount_read;
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int done = 0;
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while (!done)
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{
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while ((bindex + 1024) > (bsize))
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buffer = (char *)xrealloc (buffer, (bsize += 1024));
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buffer[bindex] = '\0';
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amount_read = read (fd, buffer + bindex, 1023);
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if (amount_read < 0)
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{
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done = 1;
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}
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else
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{
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bindex += amount_read;
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buffer[bindex] = '\0';
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if (amount_read == 0)
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done = 1;
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}
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}
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}
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}
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if ((buffer != (char *)NULL) && (*buffer == '\0'))
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{
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free (buffer);
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buffer = (char *)NULL;
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}
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return (buffer);
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}
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static char *reference_section_starters[] =
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{
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"\nRELATED INFORMATION",
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"\nRELATED\tINFORMATION",
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"RELATED INFORMATION\n",
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"RELATED\tINFORMATION\n",
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"\nSEE ALSO",
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"\nSEE\tALSO",
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"SEE ALSO\n",
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"SEE\tALSO\n",
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(char *)NULL
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};
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static SEARCH_BINDING frs_binding;
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static SEARCH_BINDING *
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find_reference_section (node)
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NODE *node;
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{
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register int i;
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long position = -1;
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frs_binding.buffer = node->contents;
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frs_binding.start = 0;
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frs_binding.end = node->nodelen;
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frs_binding.flags = S_SkipDest;
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for (i = 0; reference_section_starters[i] != (char *)NULL; i++)
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{
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position = search_forward (reference_section_starters[i], &frs_binding);
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if (position != -1)
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break;
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}
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if (position == -1)
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return ((SEARCH_BINDING *)NULL);
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/* We found the start of the reference section, and point is right after
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the string which starts it. The text from here to the next header
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(or end of buffer) contains the only references in this manpage. */
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frs_binding.start = position;
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for (i = frs_binding.start; i < frs_binding.end - 2; i++)
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{
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if ((frs_binding.buffer[i] == '\n') &&
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(!whitespace (frs_binding.buffer[i + 1])))
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{
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frs_binding.end = i;
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break;
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}
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}
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return (&frs_binding);
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}
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REFERENCE **
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xrefs_of_manpage (node)
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NODE *node;
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{
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SEARCH_BINDING *reference_section;
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REFERENCE **refs = (REFERENCE **)NULL;
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int refs_index = 0;
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int refs_slots = 0;
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long position;
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reference_section = find_reference_section (node);
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if (reference_section == (SEARCH_BINDING *)NULL)
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return ((REFERENCE **)NULL);
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/* Grovel the reference section building a list of references found there.
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A reference is alphabetic characters followed by non-whitespace text
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within parenthesis. */
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reference_section->flags = 0;
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while ((position = search_forward ("(", reference_section)) != -1)
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{
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register int start, end;
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for (start = position; start > reference_section->start; start--)
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if (whitespace (reference_section->buffer[start]))
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break;
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start++;
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for (end = position; end < reference_section->end; end++)
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{
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if (whitespace (reference_section->buffer[end]))
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{
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end = start;
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break;
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}
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if (reference_section->buffer[end] == ')')
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{
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end++;
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break;
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}
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}
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if (end != start)
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{
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REFERENCE *entry;
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int len = end - start;
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entry = (REFERENCE *)xmalloc (sizeof (REFERENCE));
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entry->label = (char *)xmalloc (1 + len);
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strncpy (entry->label, (reference_section->buffer) + start, len);
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entry->label[len] = '\0';
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entry->filename = xstrdup (node->filename);
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entry->nodename = xstrdup (entry->label);
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entry->start = start;
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entry->end = end;
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add_pointer_to_array
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(entry, refs_index, refs, refs_slots, 10, REFERENCE *);
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}
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reference_section->start = position + 1;
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}
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return (refs);
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}
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long
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locate_manpage_xref (node, start, dir)
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NODE *node;
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long start;
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int dir;
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{
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REFERENCE **refs;
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long position = -1;
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refs = xrefs_of_manpage (node);
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if (refs)
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{
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register int i, count;
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REFERENCE *entry;
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for (i = 0; refs[i]; i++);
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count = i;
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if (dir > 0)
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{
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for (i = 0; (entry = refs[i]); i++)
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if (entry->start > start)
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{
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position = entry->start;
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break;
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}
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}
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else
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{
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for (i = count - 1; i > -1; i--)
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{
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entry = refs[i];
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|
if (entry->start < start)
|
|
{
|
|
position = entry->start;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
info_free_references (refs);
|
|
}
|
|
return (position);
|
|
}
|
|
|
|
/* This one was a little tricky. The binding buffer that is passed in has
|
|
a START and END value of 0 -- strlen (window-line-containing-point).
|
|
The BUFFER is a pointer to the start of that line. */
|
|
REFERENCE **
|
|
manpage_xrefs_in_binding (node, binding)
|
|
NODE *node;
|
|
SEARCH_BINDING *binding;
|
|
{
|
|
register int i;
|
|
REFERENCE **all_refs = xrefs_of_manpage (node);
|
|
REFERENCE **brefs = (REFERENCE **)NULL;
|
|
REFERENCE *entry;
|
|
int brefs_index = 0;
|
|
int brefs_slots = 0;
|
|
int start, end;
|
|
|
|
if (!all_refs)
|
|
return ((REFERENCE **)NULL);
|
|
|
|
start = binding->start + (binding->buffer - node->contents);
|
|
end = binding->end + (binding->buffer - node->contents);
|
|
|
|
for (i = 0; (entry = all_refs[i]); i++)
|
|
{
|
|
if ((entry->start > start) && (entry->end < end))
|
|
{
|
|
add_pointer_to_array
|
|
(entry, brefs_index, brefs, brefs_slots, 10, REFERENCE *);
|
|
}
|
|
else
|
|
{
|
|
maybe_free (entry->label);
|
|
maybe_free (entry->filename);
|
|
maybe_free (entry->nodename);
|
|
free (entry);
|
|
}
|
|
}
|
|
|
|
free (all_refs);
|
|
return (brefs);
|
|
}
|