perf tools: Add kmod_path__parse function

Commit-ID:  3c8a67f50a1e68b912d1d74db6b455cac54ec4b4
Gitweb:     http://git.kernel.org/tip/3c8a67f50a1e68b912d1d74db6b455cac54ec4b4
Author:     Jiri Olsa <[email protected]>
AuthorDate: Thu, 5 Feb 2015 15:40:25 +0100
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Sat, 21 Mar 2015 14:53:41 -0300

perf tools: Add kmod_path__parse function

Provides united way of parsing kernel module path into several components.

The new kmod_path__parse function and few defines:

int __kmod_path__parse(struct kmod_path *m, const char *path,

                         bool alloc_name, bool alloc_ext);

  #define kmod_path__parse(__m, __p)      __kmod_path__parse(__m, __p, false, false)
  #define kmod_path__parse_name(__m, __p) __kmod_path__parse(__m, __p, true , false)
  #define kmod_path__parse_ext(__m, __p)  __kmod_path__parse(__m, __p, false, true)

parse kernel module @path and updates @m argument like:

@comp - true if @path contains supported compression suffix,
false otherwise
@kmod - true if @path contains '.ko' suffix in right position,
false otherwise
@name - if (@alloc_name && @kmod) is true, it contains strdup-ed base name
of the kernel module without suffixes, otherwise strudup-ed base name of @path
@ext - if (@alloc_ext && @comp) is true, it contains strdup-ed string
the compression suffix

It returns 0 if there's no strdup error, -ENOMEM otherwise.

---
 tools/perf/tests/Build          |  1 +
 tools/perf/tests/builtin-test.c |  4 +++
 tools/perf/tests/kmod-path.c    | 73 +++++++++++++++++++++++++++++++++++++++++
 tools/perf/tests/tests.h        |  1 +
 tools/perf/util/dso.c           | 66 +++++++++++++++++++++++++++++++++++++
 tools/perf/util/dso.h           | 14 ++++++++
 6 files changed, 159 insertions(+)

index 2de01a4..6a8801b 100644
@@ -30,6 +30,7 @@ perf-y += keep-tracking.o
 perf-y += code-reading.o
 perf-y += sample-parsing.o
 perf-y += parse-no-sample-id-all.o
+perf-y += kmod-path.o
 
 perf-$(CONFIG_X86) += perf-time-to-tsc.o
 

index ed8e05c..4f40981 100644
@@ -167,6 +167,10 @@ static struct test {
 		.func = test__fdarray__add,
 	},
 	{
+		.desc = "Test kmod_path__parse function",
+		.func = test__kmod_path__parse,
+	},
+	{
 		.func = NULL,
 	},
 };

index 00e776a..52758a3 100644
@@ -51,6 +51,7 @@ int test__hists_cumulate(void);
 int test__switch_tracking(void);
 int test__fdarray__filter(void);
 int test__fdarray__add(void);
+int test__kmod_path__parse(void);
 
 #if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
 #ifdef HAVE_DWARF_UNWIND_SUPPORT

index 408c65f..384cd29 100644
@@ -195,6 +195,20 @@ bool is_kernel_module(const char *pathname, bool *compressed);
 bool decompress_to_file(const char *ext, const char *filename, int output_fd);
 bool dso__needs_decompress(struct dso *dso);
 
+struct kmod_path {
+	char *name;
+	char *ext;
+	bool  comp;
+	bool  kmod;
+};
+
+int __kmod_path__parse(struct kmod_path *m, const char *path,
+		     bool alloc_name, bool alloc_ext);
+
+#define kmod_path__parse(__m, __p)      __kmod_path__parse(__m, __p, false, false)
+#define kmod_path__parse_name(__m, __p) __kmod_path__parse(__m, __p, true , false)
+#define kmod_path__parse_ext(__m, __p)  __kmod_path__parse(__m, __p, false, true)
+
 /*
  * The dso__data_* external interface provides following functions:
  *   dso__data_fd