trust: Don't use POSIX or GNU basename()

Both are nasty. Do our own, and test it a bit

https://bugs.freedesktop.org/show_bug.cgi?id=62479

4 files changed, 131 insertions, 24 deletions

diff --git a/common/compat.c b/common/compat.c
index 4e99d11..2548459 100644
--- a/common/compat.c
+++ b/common/compat.c
@@ -148,31 +148,39 @@ getprogname (void)
 
 #endif /* HAVE_GETPROGNAME */
 
-#ifndef HAVE_BASENAME
-
 char *
-basename (const char *name)
+p11_basename (const char *name)
 {
-	char *p;
 #ifdef OS_WIN32
-	char *p2;
+	static const char *delims = "/\\";
+#else
+	static const char *delims = "/";
 #endif
 
-	if (!name || name[0] == '\0')
-		return ".";
+	const char *end;
+	const char *beg;
 
-	p = strrchr (name, '/');
-#ifdef OS_WIN32
-	p2 = strrchr (name, '\\');
-	if (p2 > p)
-		p = p2;
-#endif
-	if (p != NULL)
-		return p + 1;
-	return (char *)name;
-}
+	if (name == NULL)
+		return NULL;
+
+	/* Any trailing slashes */
+	end = name + strlen (name);
+	while (end != name) {
+		if (!strchr (delims, *(end - 1)))
+			break;
+		end--;
+	}
 
-#endif /* HAVE_BASENAME */
+	/* Find the last slash after those */
+	beg = end;
+	while (beg != name) {
+		if (strchr (delims, *(beg - 1)))
+			break;
+		beg--;
+	}
+
+	return strndup (beg, end - beg);
+}
 
 #ifdef OS_UNIX
 #include <sys/stat.h>
diff --git a/common/compat.h b/common/compat.h
index a6a02af..bd933cb 100644
--- a/common/compat.h
+++ b/common/compat.h
@@ -72,12 +72,6 @@
 const char * getprogname (void);
 #endif
 
-#ifndef HAVE_BASENAME
-
-char *       basename    (const char *name);
-
-#endif /* HAVE_BASENAME */
-
 #ifndef HAVE_MKSTEMP
 
 int          mkstemp     (char *template);
@@ -220,6 +214,17 @@ void        p11_mmap_close  (p11_mmap *map);
 
 #endif /* OS_UNIX */
 
+/*
+ * The semantics of both POSIX basename() and GNU asename() are so crappy that
+ * we just don't even bother. And what's worse is how it completely changes
+ * behavior if _GNU_SOURCE is defined. Nasty stuff.
+ */
+char *       p11_basename   (const char *name);
+
+/* ----------------------------------------------------------------------------
+ * MORE COMPAT
+ */
+
 #ifdef	HAVE_ERRNO_H
 #include <errno.h>
 #endif	/* HAVE_ERRNO_H */
diff --git a/common/tests/Makefile.am b/common/tests/Makefile.am
index e14fddd..85893cb 100644
--- a/common/tests/Makefile.am
+++ b/common/tests/Makefile.am
@@ -15,6 +15,7 @@ LDADD = \
 	$(NULL)
 
 CHECK_PROGS = \
+	test-compat \
 	test-dict \
 	test-array \
 	test-constants \
diff --git a/common/tests/test-compat.c b/common/tests/test-compat.c
new file mode 100644
index 0000000..13a7a33
--- /dev/null
+++ b/common/tests/test-compat.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2013 Red Hat Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *     * Redistributions of source code must retain the above
+ *       copyright notice, this list of conditions and the
+ *       following disclaimer.
+ *     * Redistributions in binary form must reproduce the
+ *       above copyright notice, this list of conditions and
+ *       the following disclaimer in the documentation and/or
+ *       other materials provided with the distribution.
+ *     * The names of contributors to this software may not be
+ *       used to endorse or promote products derived from this
+ *       software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * Author: Stef Walter <stefw@redhat.com>
+ */
+
+#include "config.h"
+#include "CuTest.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "compat.h"
+
+static void
+test_basename (CuTest *tc)
+{
+	struct {
+		const char *in;
+		const char *out;
+	} fixtures[] = {
+		{ "/this/is/a/path", "path" },
+		{ "/this/is/a/folder/", "folder" },
+		{ "folder/", "folder" },
+		{ "/", "" },
+		{ "this", "this" },
+#ifdef OS_WIN32
+		{ "\\this\\is\\a\\path", "path" },
+		{ "\\this\\is\\a\\folder\\", "folder" },
+		{ "folder\\", "folder" },
+		{ "\\", "" },
+#endif
+		{ NULL },
+	};
+
+	char *out;
+	int i;
+
+	for (i = 0; fixtures[i].in != NULL; i++) {
+		out = p11_basename (fixtures[i].in);
+		CuAssertStrEquals (tc, fixtures[i].out, out);
+		free (out);
+	}
+}
+
+int
+main (void)
+{
+	CuString *output = CuStringNew ();
+	CuSuite* suite = CuSuiteNew ();
+	int ret;
+
+	SUITE_ADD_TEST (suite, test_basename);
+
+	CuSuiteRun (suite);
+	CuSuiteSummary (suite, output);
+	CuSuiteDetails (suite, output);
+	printf ("%s\n", output->buffer);
+	ret = suite->failCount;
+	CuSuiteDelete (suite);
+	CuStringDelete (output);
+
+	return ret;
+}