[src/trunk]: src/lib/libc/gen Factor out the basename and dirname code into b...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/cbd11fe03b4d
branches:  trunk
changeset: 797351:cbd11fe03b4d
user:      christos <christos%NetBSD.org@localhost>
date:      Mon Jul 14 20:44:45 2014 +0000

description:
Factor out the basename and dirname code into basename_r and dirname_r
which are static for now. Inspired by similar changes to android(bionic).

diffstat:

 lib/libc/gen/basename.c |  64 ++++++++++++++++++++++++--------------
 lib/libc/gen/dirname.c  |  79 ++++++++++++++++++++++++++----------------------
 2 files changed, 83 insertions(+), 60 deletions(-)

diffs (218 lines):

diff -r 6c3c28ca2254 -r cbd11fe03b4d lib/libc/gen/basename.c
--- a/lib/libc/gen/basename.c   Mon Jul 14 20:20:31 2014 +0000
+++ b/lib/libc/gen/basename.c   Mon Jul 14 20:44:45 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: basename.c,v 1.9 2009/11/24 13:34:20 tnozaki Exp $     */
+/*     $NetBSD: basename.c,v 1.10 2014/07/14 20:44:45 christos Exp $   */
 
 /*-
  * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
@@ -31,11 +31,13 @@
 
 #include <sys/cdefs.h>
 #if defined(LIBC_SCCS) && !defined(lint)
-__RCSID("$NetBSD: basename.c,v 1.9 2009/11/24 13:34:20 tnozaki Exp $");
+__RCSID("$NetBSD: basename.c,v 1.10 2014/07/14 20:44:45 christos Exp $");
 #endif /* !LIBC_SCCS && !lint */
 
 #include "namespace.h"
+#include <sys/param.h>
 #include <libgen.h>
+#include <string.h>
 #include <limits.h>
 #include <string.h>
 
@@ -43,43 +45,57 @@
 __weak_alias(basename,_basename)
 #endif
 
-#if !HAVE_BASENAME
-char *
-basename(char *path)
+static size_t
+basename_r(const char *path, char *buf, size_t buflen)
 {
-       static char result[PATH_MAX];
-       const char *p, *lastp;
+       const char *startp, *endp;
        size_t len;
 
        /*
         * If `path' is a null pointer or points to an empty string,
         * return a pointer to the string ".".
         */
-       if ((path == NULL) || (*path == '\0')) {
-               result[0] = '.';
-               result[1] = '\0';
-
-               return (result);
+       if (path == NULL || *path == '\0') {
+               startp = ".";
+               len = 1;
+               goto out;
        }
 
        /* Strip trailing slashes, if any. */
-       lastp = path + strlen(path) - 1;
-       while (lastp != path && *lastp == '/')
-               lastp--;
+       endp = path + strlen(path) - 1;
+       while (endp != path && *endp == '/')
+               endp--;
+
+       /* Only slashes -> "/" */
+       if (endp == path && *endp == '/') {
+               startp = "/";
+               len = 1;
+               goto out;
+       }
 
        /* Now find the beginning of this (final) component. */
-       p = lastp;
-       while (p != path && *(p - 1) != '/')
-               p--;
+       for (startp = endp; startp > path && *(startp - 1) != '/'; startp--)
+               continue;
 
        /* ...and copy the result into the result buffer. */
-       len = (lastp - p) + 1 /* last char */;
-       if (len > (PATH_MAX - 1))
-               len = PATH_MAX - 1;
+       len = (endp - startp) + 1 /* last char */;
+out:
+       if (buf != NULL && buflen != 0) {
+               buflen = MIN(len, buflen - 1);
+               memcpy(buf, startp, buflen);
+               buf[buflen] = '\0';
+       }
+       return len;
+}
 
-       memcpy(result, p, len);
-       result[len] = '\0';
+#if !HAVE_BASENAME
+
+char *
+basename(char *path) {
+       static char result[PATH_MAX];
 
-       return (result);
+       (void)basename_r(path, result, sizeof(result));
+       return result;
 }
+
 #endif
diff -r 6c3c28ca2254 -r cbd11fe03b4d lib/libc/gen/dirname.c
--- a/lib/libc/gen/dirname.c    Mon Jul 14 20:20:31 2014 +0000
+++ b/lib/libc/gen/dirname.c    Mon Jul 14 20:44:45 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dirname.c,v 1.11 2009/11/24 13:34:20 tnozaki Exp $     */
+/*     $NetBSD: dirname.c,v 1.12 2014/07/14 20:44:45 christos Exp $    */
 
 /*-
  * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
@@ -31,10 +31,11 @@
 
 #include <sys/cdefs.h>
 #if defined(LIBC_SCCS) && !defined(lint)
-__RCSID("$NetBSD: dirname.c,v 1.11 2009/11/24 13:34:20 tnozaki Exp $");
+__RCSID("$NetBSD: dirname.c,v 1.12 2014/07/14 20:44:45 christos Exp $");
 #endif /* !LIBC_SCCS && !lint */
 
 #include "namespace.h"
+#include <sys/param.h>
 #include <libgen.h>
 #include <limits.h>
 #include <string.h>
@@ -43,51 +44,57 @@
 __weak_alias(dirname,_dirname)
 #endif
 
-#if !HAVE_DIRNAME
-char *
-dirname(char *path)
+static size_t
+dirname_r(const char *path, char *buf, size_t buflen)
 {
-       static char result[PATH_MAX];
-       const char *lastp;
+       const char *endp;
        size_t len;
 
        /*
         * If `path' is a null pointer or points to an empty string,
         * return a pointer to the string ".".
         */
-       if ((path == NULL) || (*path == '\0'))
-               goto singledot;
-
+       if (path == NULL || *path == '\0') {
+               path = ".";
+               len = 1;
+               goto out;
+       }
 
        /* Strip trailing slashes, if any. */
-       lastp = path + strlen(path) - 1;
-       while (lastp != path && *lastp == '/')
-               lastp--;
+       endp = path + strlen(path) - 1;
+       while (endp != path && *endp == '/')
+               endp--;
+
+       /* Find the start of the dir */
+       while (endp > path && *endp != '/')
+               endp--;
 
-       /* Terminate path at the last occurence of '/'. */
-       do {
-               if (*lastp == '/') {
-                       /* Strip trailing slashes, if any. */
-                       while (lastp != path && *lastp == '/')
-                               lastp--;
+       if (endp == path) {
+               path = *endp == '/' ? "/" : ".";
+               len = 1;
+               goto out;
+       }
+
+       do
+               endp--;
+       while (endp > path && *endp == '/');
 
-                       /* ...and copy the result into the result buffer. */
-                       len = (lastp - path) + 1 /* last char */;
-                       if (len > (PATH_MAX - 1))
-                               len = PATH_MAX - 1;
-
-                       memcpy(result, path, len);
-                       result[len] = '\0';
+       len = endp - path + 1;
+out:
+       if (buf != NULL && buflen != 0) {
+               buflen = MIN(len, buflen - 1);
+               memcpy(buf, path, buflen);
+               buf[buflen] = '\0';
+       }
+       return len;
+}
 
-                       return (result);
-               }
-       } while (--lastp >= path);
-
-       /* No /'s found, return a pointer to the string ".". */
-singledot:
-       result[0] = '.';
-       result[1] = '\0';
-
-       return (result);
+#if !HAVE_DIRNAME
+char *
+dirname(char *path)
+{
+       static char result[PATH_MAX];
+       (void)dirname_r(path, result, sizeof(result));
+       return result;
 }
 #endif