/* man.c: How to read and format man files. $Id: man.c,v 1.3 2000/02/09 02:18:40 espie Exp $ Copyright (C) 1995, 97, 98, 99 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Written by Brian Fox Thu May 4 09:17:52 1995 (bfox@ai.mit.edu). */ #include "info.h" #include #include "signals.h" #if defined (HAVE_SYS_TIME_H) #include #endif #if defined (HAVE_SYS_WAIT_H) #include #endif #include "tilde.h" #include "man.h" #if !defined (_POSIX_VERSION) #define pid_t int #endif #if defined (FD_SET) # if defined (hpux) # define fd_set_cast(x) (int *)(x) # else # define fd_set_cast(x) (fd_set *)(x) # endif /* !hpux */ #endif /* FD_SET */ #if STRIP_DOT_EXE static char const * const exec_extensions[] = { ".exe", ".com", ".bat", ".btm", ".sh", ".ksh", ".pl", ".sed", "", NULL }; #else static char const * const exec_extensions[] = { "", NULL }; #endif static char *read_from_fd (); static void clean_manpage (); static NODE *manpage_node_of_file_buffer (); static char *get_manpage_contents (); NODE * make_manpage_node (pagename) char *pagename; { return (info_get_node (MANPAGE_FILE_BUFFER_NAME, pagename)); } NODE * get_manpage_node (file_buffer, pagename) FILE_BUFFER *file_buffer; char *pagename; { NODE *node; node = manpage_node_of_file_buffer (file_buffer, pagename); if (!node) { char *page; page = get_manpage_contents (pagename); if (page) { char header[1024]; long oldsize, newsize; int hlen, plen; char *old_contents = file_buffer->contents; sprintf (header, "\n\n%c\n%s %s, %s %s, %s (dir)\n\n", INFO_COOKIE, INFO_FILE_LABEL, file_buffer->filename, INFO_NODE_LABEL, pagename, INFO_UP_LABEL); oldsize = file_buffer->filesize; hlen = strlen (header); plen = strlen (page); newsize = (oldsize + hlen + plen); file_buffer->contents = (char *)xrealloc (file_buffer->contents, 1 + newsize); memcpy (file_buffer->contents + oldsize, header, hlen); memcpy (file_buffer->contents + oldsize + hlen, page, plen); file_buffer->contents[newsize] = '\0'; file_buffer->filesize = newsize; file_buffer->finfo.st_size = newsize; build_tags_and_nodes (file_buffer); free (page); /* We have just relocated file_buffer->contents from under the feet of info_windows[] array. Therefore, all the nodes on that list which are showing man pages have their contents member pointing into the blue. Undo that harm. */ if (old_contents && oldsize && old_contents != file_buffer->contents) { int iw; INFO_WINDOW *info_win; char *old_contents_end = old_contents + oldsize; for (iw = 0; (info_win = info_windows[iw]); iw++) { int in; for (in = 0; in < info_win->nodes_index; in++) { NODE *node = info_win->nodes[in]; /* It really only suffices to see that node->filename is "*manpages*". But after several hours of debugging this, would you blame me for being a bit paranoid? */ if (node && node->filename && node->contents && strcmp (node->filename, MANPAGE_FILE_BUFFER_NAME) == 0 && node->contents >= old_contents && node->contents + node->nodelen <= old_contents_end) { info_win->nodes[in] = manpage_node_of_file_buffer (file_buffer, node->nodename); free (node->nodename); free (node); } } } } } node = manpage_node_of_file_buffer (file_buffer, pagename); } return (node); } FILE_BUFFER * create_manpage_file_buffer () { FILE_BUFFER *file_buffer = make_file_buffer (); file_buffer->filename = xstrdup (MANPAGE_FILE_BUFFER_NAME); file_buffer->fullpath = xstrdup (MANPAGE_FILE_BUFFER_NAME); file_buffer->finfo.st_size = 0; file_buffer->filesize = 0; file_buffer->contents = (char *)NULL; file_buffer->flags = (N_IsInternal | N_CannotGC | N_IsManPage); return (file_buffer); } /* Scan the list of directories in PATH looking for FILENAME. If we find one that is an executable file, return it as a new string. Otherwise, return a NULL pointer. */ static char * executable_file_in_path (filename, path) char *filename, *path; { struct stat finfo; char *temp_dirname; int statable, dirname_index; dirname_index = 0; while ((temp_dirname = extract_colon_unit (path, &dirname_index))) { char *temp; char *temp_end; int i; /* Expand a leading tilde if one is present. */ if (*temp_dirname == '~') { char *expanded_dirname; expanded_dirname = tilde_expand_word (temp_dirname); free (temp_dirname); temp_dirname = expanded_dirname; } temp = (char *)xmalloc (34 + strlen (temp_dirname) + strlen (filename)); strcpy (temp, temp_dirname); if (!IS_SLASH (temp[(strlen (temp)) - 1])) strcat (temp, "/"); strcat (temp, filename); temp_end = temp + strlen (temp); free (temp_dirname); /* Look for FILENAME, possibly with any of the extensions in EXEC_EXTENSIONS[]. */ for (i = 0; exec_extensions[i]; i++) { if (exec_extensions[i][0]) strcpy (temp_end, exec_extensions[i]); statable = (stat (temp, &finfo) == 0); /* If we have found a regular executable file, then use it. */ if ((statable) && (S_ISREG (finfo.st_mode)) && (access (temp, X_OK) == 0)) return (temp); } free (temp); } return ((char *)NULL); } /* Return the full pathname of the system man page formatter. */ static char * find_man_formatter () { return (executable_file_in_path ("man", (char *)getenv ("PATH"))); } static char *manpage_pagename = (char *)NULL; static char *manpage_section = (char *)NULL; static void get_page_and_section (pagename) char *pagename; { register int i; if (manpage_pagename) free (manpage_pagename); if (manpage_section) free (manpage_section); manpage_pagename = (char *)NULL; manpage_section = (char *)NULL; for (i = 0; pagename[i] != '\0' && pagename[i] != '('; i++); manpage_pagename = (char *)xmalloc (1 + i); strncpy (manpage_pagename, pagename, i); manpage_pagename[i] = '\0'; if (pagename[i] == '(') { int start; start = i + 1; for (i = start; pagename[i] != '\0' && pagename[i] != ')'; i++); manpage_section = (char *)xmalloc (1 + (i - start)); strncpy (manpage_section, pagename + start, (i - start)); manpage_section[i - start] = '\0'; } } #if PIPE_USE_FORK static void reap_children (sig) int sig; { wait (NULL); } #endif static char * get_manpage_contents (pagename) char *pagename; { static char *formatter_args[4] = { (char *)NULL }; int pipes[2]; pid_t child; RETSIGTYPE (*sigsave) (); char *formatted_page = NULL; int arg_index = 1; if (formatter_args[0] == (char *)NULL) formatter_args[0] = find_man_formatter (); if (formatter_args[0] == (char *)NULL) return ((char *)NULL); get_page_and_section (pagename); if (manpage_section != (char *)NULL) formatter_args[arg_index++] = manpage_section; formatter_args[arg_index++] = manpage_pagename; formatter_args[arg_index] = (char *)NULL; /* Open a pipe to this program, read the output, and save it away in FORMATTED_PAGE. The reader end of the pipe is pipes[0]; the writer end is pipes[1]. */ #if PIPE_USE_FORK pipe (pipes); sigsave = signal (SIGCHLD, reap_children); child = fork (); if (child == -1) return ((char *)NULL); if (child != 0) { /* In the parent, close the writing end of the pipe, and read from the exec'd child. */ close (pipes[1]); formatted_page = read_from_fd (pipes[0]); close (pipes[0]); signal (SIGCHLD, sigsave); } else { /* In the child, close the read end of the pipe, make the write end of the pipe be stdout, and execute the man page formatter. */ close (pipes[0]); freopen (NULL_DEVICE, "w", stderr); freopen (NULL_DEVICE, "r", stdin); dup2 (pipes[1], fileno (stdout)); execv (formatter_args[0], formatter_args); /* If we get here, we couldn't exec, so close out the pipe and exit. */ close (pipes[1]); xexit (0); } #else /* !PIPE_USE_FORK */ /* Cannot fork/exec, but can popen/pclose. */ { FILE *fpipe; char *cmdline = xmalloc (strlen (formatter_args[0]) + strlen (manpage_pagename) + (arg_index > 2 ? strlen (manpage_section) : 0) + 3); int save_stderr = dup (fileno (stderr)); int fd_err = open (NULL_DEVICE, O_WRONLY, 0666); if (fd_err > 2) dup2 (fd_err, fileno (stderr)); /* Don't print errors. */ sprintf (cmdline, "%s %s %s", formatter_args[0], manpage_pagename, arg_index > 2 ? manpage_section : ""); fpipe = popen (cmdline, "r"); free (cmdline); if (fd_err > 2) close (fd_err); dup2 (save_stderr, fileno (stderr)); if (fpipe == 0) return ((char *)NULL); formatted_page = read_from_fd (fileno (fpipe)); if (pclose (fpipe) == -1) { if (formatted_page) free (formatted_page); return ((char *)NULL); } } #endif /* !PIPE_USE_FORK */ /* If we have the page, then clean it up. */ if (formatted_page) clean_manpage (formatted_page); return (formatted_page); } static void clean_manpage (manpage) char *manpage; { register int i, j; int newline_count = 0; char *newpage; newpage = (char *)xmalloc (1 + strlen (manpage)); for (i = 0, j = 0; (newpage[j] = manpage[i]); i++, j++) { if (manpage[i] == '\n') newline_count++; else newline_count = 0; if (newline_count == 3) { j--; newline_count--; } if (manpage[i] == '\b' || manpage[i] == '\f') j -= 2; } newpage[j++] = '\0'; strcpy (manpage, newpage); free (newpage); } static NODE * manpage_node_of_file_buffer (file_buffer, pagename) FILE_BUFFER *file_buffer; char *pagename; { NODE *node = (NODE *)NULL; TAG *tag = (TAG *)NULL; if (file_buffer->contents) { register int i; for (i = 0; (tag = file_buffer->tags[i]); i++) { if (strcasecmp (pagename, tag->nodename) == 0) break; } } if (tag) { node = (NODE *)xmalloc (sizeof (NODE)); node->filename = file_buffer->filename; node->nodename = xstrdup (tag->nodename); node->contents = file_buffer->contents + tag->nodestart; node->nodelen = tag->nodelen; node->flags = 0; node->display_pos = 0; node->parent = (char *)NULL; node->flags = (N_HasTagsTable | N_IsManPage); node->contents += skip_node_separator (node->contents); } return (node); } static char * read_from_fd (fd) int fd; { struct timeval timeout; char *buffer = (char *)NULL; int bsize = 0; int bindex = 0; int select_result; #if defined (FD_SET) fd_set read_fds; timeout.tv_sec = 15; timeout.tv_usec = 0; FD_ZERO (&read_fds); FD_SET (fd, &read_fds); select_result = select (fd + 1, fd_set_cast (&read_fds), 0, 0, &timeout); #else /* !FD_SET */ select_result = 1; #endif /* !FD_SET */ switch (select_result) { case 0: case -1: break; default: { int amount_read; int done = 0; while (!done) { while ((bindex + 1024) > (bsize)) buffer = (char *)xrealloc (buffer, (bsize += 1024)); buffer[bindex] = '\0'; amount_read = read (fd, buffer + bindex, 1023); if (amount_read < 0) { done = 1; } else { bindex += amount_read; buffer[bindex] = '\0'; if (amount_read == 0) done = 1; } } } } if ((buffer != (char *)NULL) && (*buffer == '\0')) { free (buffer); buffer = (char *)NULL; } return (buffer); } static char *reference_section_starters[] = { "\nRELATED INFORMATION", "\nRELATED\tINFORMATION", "RELATED INFORMATION\n", "RELATED\tINFORMATION\n", "\nSEE ALSO", "\nSEE\tALSO", "SEE ALSO\n", "SEE\tALSO\n", (char *)NULL }; static SEARCH_BINDING frs_binding; static SEARCH_BINDING * find_reference_section (node) NODE *node; { register int i; long position = -1; frs_binding.buffer = node->contents; frs_binding.start = 0; frs_binding.end = node->nodelen; frs_binding.flags = S_SkipDest; for (i = 0; reference_section_starters[i] != (char *)NULL; i++) { position = search_forward (reference_section_starters[i], &frs_binding); if (position != -1) break; } if (position == -1) return ((SEARCH_BINDING *)NULL); /* We found the start of the reference section, and point is right after the string which starts it. The text from here to the next header (or end of buffer) contains the only references in this manpage. */ frs_binding.start = position; for (i = frs_binding.start; i < frs_binding.end - 2; i++) { if ((frs_binding.buffer[i] == '\n') && (!whitespace (frs_binding.buffer[i + 1]))) { frs_binding.end = i; break; } } return (&frs_binding); } REFERENCE ** xrefs_of_manpage (node) NODE *node; { SEARCH_BINDING *reference_section; REFERENCE **refs = (REFERENCE **)NULL; int refs_index = 0; int refs_slots = 0; long position; reference_section = find_reference_section (node); if (reference_section == (SEARCH_BINDING *)NULL) return ((REFERENCE **)NULL); /* Grovel the reference section building a list of references found there. A reference is alphabetic characters followed by non-whitespace text within parenthesis. */ reference_section->flags = 0; while ((position = search_forward ("(", reference_section)) != -1) { register int start, end; for (start = position; start > reference_section->start; start--) if (whitespace (reference_section->buffer[start])) break; start++; for (end = position; end < reference_section->end; end++) { if (whitespace (reference_section->buffer[end])) { end = start; break; } if (reference_section->buffer[end] == ')') { end++; break; } } if (end != start) { REFERENCE *entry; int len = end - start; entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); entry->label = (char *)xmalloc (1 + len); strncpy (entry->label, (reference_section->buffer) + start, len); entry->label[len] = '\0'; entry->filename = xstrdup (node->filename); entry->nodename = xstrdup (entry->label); entry->start = start; entry->end = end; add_pointer_to_array (entry, refs_index, refs, refs_slots, 10, REFERENCE *); } reference_section->start = position + 1; } return (refs); } long locate_manpage_xref (node, start, dir) NODE *node; long start; int dir; { REFERENCE **refs; long position = -1; refs = xrefs_of_manpage (node); if (refs) { register int i, count; REFERENCE *entry; for (i = 0; refs[i]; i++); count = i; if (dir > 0) { for (i = 0; (entry = refs[i]); i++) if (entry->start > start) { position = entry->start; break; } } else { for (i = count - 1; i > -1; i--) { entry = refs[i]; 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); }