mandoc.db
The manual page database.
mansearch3
Search manual page databases
Usage
#include <stdint.h>
#include <manconf.h>
#include <mansearch.h>
int
mansearch(const struct mansearch *search, const struct manpaths *paths, int argc, char *argv[], struct manpage **res, size_t *sz);
Overview
The mansearch() function returns information about manuals matching a search query from a mandoc.db(5) database.
The query arguments are as follows:
- const struct mansearch *search
-
Search options, defined in ⟨mansearch.h⟩.
- const struct manpaths *paths
-
Directories to be searched, defined in ⟨manconf.h⟩.
- int argc, char *argv[],
-
Search criteria, usually taken from the command line.
The output arguments are as follows:
- struct manpage **res
-
Returns a pointer to an array of result structures defined in ⟨mansearch.h⟩. The user is expected to call free(3) on the file, names, and output fields of all structures, as well as the res array itself.
- size_t *sz
-
Returns the number of result structures contained in res.
Implementation notes
For each manual page tree, the search is done in two steps. In the first step, a list of pages matching the search criteria is built. In the second step, the requested information about these pages is retrieved from the database and assembled into the res array.
All function mentioned here are defined in the file mansearch.c.
Finding matches
Command line parsing is done by the function exprcomp() building a singly linked list of expr structures, using the helper functions expr_and() and exprterm().
Assembling the results
The names, sections, and architectures of the manuals found are assembled into the names field of the result structure by the function buildnames().