support short URIs for man.openbsd.org

diff --git a/cgi.c b/cgi.c
index 0b01d06602e4ae46daef1198084682ada594c394..cb041b689f42263804c2e2c304103761ef8854b1 100644 (file)
--- a/cgi.c
+++ b/cgi.c
@@ -1,4 +1,4 @@
-/*     $Id: cgi.c,v 1.116 2016/01/04 12:36:26 schwarze Exp $ */
+/*     $Id: cgi.c,v 1.117 2016/03/17 21:22:59 schwarze Exp $ */
 /*
  * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2014, 2015 Ingo Schwarze <schwarze@usta.de>
@@ -64,6 +64,7 @@ static        void             html_putchar(char);
 static int              http_decode(char *);
 static void             http_parse(struct req *, const char *);
 static void             pathgen(struct req *);
+static void             path_parse(struct req *req, const char *path);
 static void             pg_error_badrequest(const char *);
 static void             pg_error_internal(void);
 static void             pg_index(const struct req *);
@@ -1033,11 +1034,21 @@ main(void)
        memset(&req, 0, sizeof(struct req));
        pathgen(&req);
 
-       /* Next parse out the query string. */
+       /* Parse the path info and the query string. */
 
-       if (NULL != (querystring = getenv("QUERY_STRING")))
+       if ((path = getenv("PATH_INFO")) == NULL)
+               path = "";
+       else if (*path == '/')
+               path++;
+
+       if (*path != '\0' && access(path, F_OK) == -1) {
+               path_parse(&req, path);
+               path = "";
+       } else if ((querystring = getenv("QUERY_STRING")) != NULL)
                http_parse(&req, querystring);
 
+       /* Validate parsed data and add defaults. */
+
        if (req.q.manpath == NULL)
                req.q.manpath = mandoc_strdup(req.p[0]);
        else if ( ! validate_manpath(&req, req.q.manpath)) {
@@ -1054,12 +1065,6 @@ main(void)
 
        /* Dispatch to the three different pages. */
 
-       path = getenv("PATH_INFO");
-       if (NULL == path)
-               path = "";
-       else if ('/' == *path)
-               path++;
-
        if ('\0' != *path)
                pg_show(&req, path);
        else if (NULL != req.q.query)
@@ -1077,6 +1082,61 @@ main(void)
        return EXIT_SUCCESS;
 }
 
+/*
+ * If PATH_INFO is not a file name, translate it to a query.
+ */
+static void
+path_parse(struct req *req, const char *path)
+{
+       int      dir_done;
+
+       req->q.equal = 1;
+       req->q.manpath = mandoc_strdup(path);
+
+       /* Mandatory manual page name. */
+       if ((req->q.query = strrchr(req->q.manpath, '/')) == NULL) {
+               req->q.query = req->q.manpath;
+               req->q.manpath = NULL;
+       } else
+               *req->q.query++ = '\0';
+
+       /* Optional trailing section. */
+       if ((req->q.sec = strrchr(req->q.query, '.')) != NULL) {
+               if(isdigit((unsigned char)req->q.sec[1])) {
+                       *req->q.sec++ = '\0';
+                       req->q.sec = mandoc_strdup(req->q.sec);
+               } else
+                       req->q.sec = NULL;
+       }
+
+       /* Handle the case of name[.section] only. */
+       if (req->q.manpath == NULL) {
+               req->q.arch = NULL;
+               return;
+       }
+       req->q.query = mandoc_strdup(req->q.query);
+
+       /* Optional architecture. */
+       dir_done = 0;
+       for (;;) {
+               if ((req->q.arch = strrchr(req->q.manpath, '/')) == NULL)
+                       break;
+               *req->q.arch++ = '\0';
+               if (dir_done || strncmp(req->q.arch, "man", 3)) {
+                       req->q.arch = mandoc_strdup(req->q.arch);
+                       break;
+               }
+
+               /* Optional directory name. */
+               req->q.arch += 3;
+               if (*req->q.arch != '\0') {
+                       free(req->q.sec);
+                       req->q.sec = mandoc_strdup(req->q.arch);
+               }
+               dir_done = 1;
+       }
+}
+
 /*
  * Scan for indexable paths.
  */