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/*
* descriptions.c: manipulate man page descriptions
*
* Copyright (C) 2002, 2003, 2006, 2007, 2008, 2009, 2010, 2011 Colin Watson.
*
* This file is part of man-db.
*
* man-db 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 of the License, or
* (at your option) any later version.
*
* man-db 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 man-db; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#include <string.h>
#include <stdlib.h>
#include "manconfig.h"
#include "descriptions.h"
/* Parse the description in a whatis line returned by find_name() into a
* sequence of names and whatis descriptions.
*/
struct page_description *parse_descriptions (const char *base,
const char *whatis)
{
const char *sep, *nextsep;
struct page_description *desc = NULL, *head = NULL;
int seen_base = 0;
if (!whatis)
return NULL;
sep = whatis;
while (sep) {
char *record;
size_t length;
const char *dash;
char *names;
const char *token;
/* Use a while loop so that we skip over things like the
* result of double line breaks.
*/
while (*sep == 0x11 || *sep == ' ')
++sep;
nextsep = strchr (sep, 0x11);
/* Get this record as a null-terminated string. */
if (nextsep)
length = (size_t) (nextsep - sep);
else
length = strlen (sep);
if (length == 0)
break;
record = xstrndup (sep, length);
debug ("record = '%s'\n", record);
/* Split the record into name and whatis description. */
dash = strstr (record, " - ");
if (dash)
names = xstrndup (record, dash - record);
else if (!desc)
/* Some pages have a NAME section with just the page
* name and no whatis. We might as well include
* this.
*/
names = xstrdup (record);
else
/* Once at least one record has been seen, further
* cases where there is no whatis usually amount to
* garbage following the useful records, and can
* cause problems due to false WHATIS_MAN entries in
* the database. On the whole it seems best to
* ignore these.
*/
goto next;
for (token = strtok (names, ","); token;
token = strtok (NULL, ",")) {
char *name = trim_spaces (token);
/* Skip name tokens containing whitespace. They are
* almost never useful as manual page names.
*/
if (strpbrk (name, " \t") != NULL) {
free (name);
continue;
}
/* Allocate new description node. */
if (head) {
desc->next = xmalloc (sizeof *desc);
desc = desc->next;
} else {
desc = xmalloc (sizeof *desc);
head = desc;
}
desc->name = name; /* steal memory */
desc->whatis = dash ? trim_spaces (dash + 3) : NULL;
desc->next = NULL;
if (base && STREQ (base, desc->name))
seen_base = 1;
}
free (names);
next:
free (record);
sep = nextsep;
}
/* If it isn't there already, add the base name onto the returned
* list.
*/
if (base && !seen_base) {
if (head) {
desc->next = xmalloc (sizeof *desc);
desc = desc->next;
desc->whatis =
head->whatis ? xstrdup (head->whatis) : NULL;
} else {
desc = xmalloc (sizeof *desc);
head = desc;
desc->whatis = NULL;
}
desc->name = xstrdup (base);
desc->next = NULL;
}
return head;
}
/* Free a description list and all its contents. */
void free_descriptions (struct page_description *head)
{
struct page_description *desc = head, *prev;
while (desc) {
free (desc->name);
free (desc->whatis);
prev = desc;
desc = desc->next;
free (prev);
}
}
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