use gcc const and pure function attributes wherever applicable

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1835 fefdeb5f-60dc-0310-8127-8f9354f1896f

4 files changed, 29 insertions, 10 deletions

diff --git a/src/pulsecore/core-util.h b/src/pulsecore/core-util.h
index efd19f45..af97e4bf 100644
--- a/src/pulsecore/core-util.h
+++ b/src/pulsecore/core-util.h
@@ -61,14 +61,14 @@ void pa_reset_priority(void);
 
 int pa_fd_set_cloexec(int fd, int b);
 
-int pa_parse_boolean(const char *s);
+int pa_parse_boolean(const char *s) PA_GCC_PURE;
 
 char *pa_split(const char *c, const char*delimiters, const char **state);
 char *pa_split_spaces(const char *c, const char **state);
 
 char *pa_strip_nl(char *s);
 
-const char *pa_strsignal(int sig);
+const char *pa_strsignal(int sig) PA_GCC_PURE;
 
 int pa_own_uid_in_group(const char *name, gid_t *gid);
 int pa_uid_in_group(uid_t uid, const char *name);
@@ -85,8 +85,8 @@ FILE *pa_open_config_file(const char *global, const char *local, const char *env
 char *pa_hexstr(const uint8_t* d, size_t dlength, char *s, size_t slength);
 size_t pa_parsehex(const char *p, uint8_t *d, size_t dlength);
 
-int pa_startswith(const char *s, const char *pfx);
-int pa_endswith(const char *s, const char *sfx);
+int pa_startswith(const char *s, const char *pfx) PA_GCC_PURE;
+int pa_endswith(const char *s, const char *sfx) PA_GCC_PURE;
 
 char *pa_runtime_path(const char *fn, char *s, size_t l);
 
diff --git a/src/pulsecore/gccmacro.h b/src/pulsecore/gccmacro.h
index f3ace593..d211c2e7 100644
--- a/src/pulsecore/gccmacro.h
+++ b/src/pulsecore/gccmacro.h
@@ -55,7 +55,26 @@
 #ifdef __GNUC__
 #define PA_GCC_DESTRUCTOR __attribute__ ((destructor))
 #else
+/** Call this function when process terminates */
 #define PA_GCC_DESTRUCTOR
 #endif
 
+#ifndef PA_GCC_PURE
+#ifdef __GNUCC__
+#define PA_GCC_PURE __attribute__ ((pure))
+#else
+/** This function's return value depends only the arguments list and global state **/
+#define PA_GCC_PURE
+#endif
+#endif
+
+#ifndef PA_GCC_CONST
+#ifdef __GNUCC__
+#define PA_GCC_CONST __attribute__ ((pure))
+#else
+/** This function's return value depends only the arguments list (stricter version of PA_GCC_CONST) **/
+#define PA_GCC_CONST
+#endif
+#endif
+
 #endif
diff --git a/src/pulsecore/sample-util.h b/src/pulsecore/sample-util.h
index 0d4924b1..92c6e9ff 100644
--- a/src/pulsecore/sample-util.h
+++ b/src/pulsecore/sample-util.h
@@ -56,8 +56,8 @@ void pa_volume_memchunk(
     const pa_sample_spec *spec,
     const pa_cvolume *volume);
 
-size_t pa_frame_align(size_t l, const pa_sample_spec *ss);
+size_t pa_frame_align(size_t l, const pa_sample_spec *ss) PA_GCC_PURE;
 
-int pa_frame_aligned(size_t l, const pa_sample_spec *ss);
+int pa_frame_aligned(size_t l, const pa_sample_spec *ss) PA_GCC_PURE;
 
 #endif
diff --git a/src/pulsecore/sconv.h b/src/pulsecore/sconv.h
index 5e8fa684..901f50a3 100644
--- a/src/pulsecore/sconv.h
+++ b/src/pulsecore/sconv.h
@@ -29,10 +29,10 @@
 
 typedef void (*pa_convert_func_t)(unsigned n, const void *a, void *b);
 
-pa_convert_func_t pa_get_convert_to_float32ne_function(pa_sample_format_t f);
-pa_convert_func_t pa_get_convert_from_float32ne_function(pa_sample_format_t f);
+pa_convert_func_t pa_get_convert_to_float32ne_function(pa_sample_format_t f) PA_GCC_PURE;
+pa_convert_func_t pa_get_convert_from_float32ne_function(pa_sample_format_t f) PA_GCC_PURE;
 
-pa_convert_func_t pa_get_convert_to_s16ne_function(pa_sample_format_t f);
-pa_convert_func_t pa_get_convert_from_s16ne_function(pa_sample_format_t f);
+pa_convert_func_t pa_get_convert_to_s16ne_function(pa_sample_format_t f) PA_GCC_PURE;
+pa_convert_func_t pa_get_convert_from_s16ne_function(pa_sample_format_t f) PA_GCC_PURE;
 
 #endif