+
+unsigned pa_gcd(unsigned a, unsigned b) {
+
+ while (b > 0) {
+ unsigned t = b;
+ b = a % b;
+ a = t;
+ }
+
+ return a;
+}
+
+void pa_reduce(unsigned *num, unsigned *den) {
+
+ unsigned gcd = pa_gcd(*num, *den);
+
+ if (gcd <= 0)
+ return;
+
+ *num /= gcd;
+ *den /= gcd;
+
+ pa_assert(pa_gcd(*num, *den) == 1);
+}
+
+unsigned pa_ncpus(void) {
+ long ncpus;
+
+#ifdef _SC_NPROCESSORS_CONF
+ ncpus = sysconf(_SC_NPROCESSORS_CONF);
+#else
+ ncpus = 1;
+#endif
+
+ return ncpus <= 0 ? 1 : (unsigned) ncpus;
+}
+
+char *pa_replace(const char*s, const char*a, const char *b) {
+ pa_strbuf *sb;
+ size_t an;
+
+ pa_assert(s);
+ pa_assert(a);
+ pa_assert(b);
+
+ an = strlen(a);
+ sb = pa_strbuf_new();
+
+ for (;;) {
+ const char *p;
+
+ if (!(p = strstr(s, a)))
+ break;
+
+ pa_strbuf_putsn(sb, s, p-s);
+ pa_strbuf_puts(sb, b);
+ s = p + an;
+ }
+
+ pa_strbuf_puts(sb, s);
+
+ return pa_strbuf_tostring_free(sb);
+}
+
+char *pa_unescape(char *p) {
+ char *s, *d;
+ pa_bool_t escaped = FALSE;
+
+ for (s = p, d = p; *s; s++) {
+ if (!escaped && *s == '\\') {
+ escaped = TRUE;
+ continue;
+ }
+
+ *(d++) = *s;
+ escaped = FALSE;
+ }
+
+ *d = 0;
+
+ return p;
+}
+
+char *pa_realpath(const char *path) {
+ char *t;
+ pa_assert(path);
+
+ /* We want only abolsute paths */
+ if (path[0] != '/') {
+ errno = EINVAL;
+ return NULL;
+ }
+
+#if defined(__GLIBC__) || defined(__APPLE__)
+ {
+ char *r;
+
+ if (!(r = realpath(path, NULL)))
+ return NULL;
+
+ /* We copy this here in case our pa_xmalloc() is not
+ * implemented on top of libc malloc() */
+ t = pa_xstrdup(r);
+ pa_xfree(r);
+ }
+#elif defined(PATH_MAX)
+ {
+ char *path_buf;
+ path_buf = pa_xmalloc(PATH_MAX);
+
+ if (!(t = realpath(path, path_buf))) {
+ pa_xfree(path_buf);
+ return NULL;
+ }
+ }
+#else
+#error "It's not clear whether this system supports realpath(..., NULL) like GNU libc does. If it doesn't we need a private version of realpath() here."
+#endif
+
+ return t;
+}
+
+void pa_disable_sigpipe(void) {
+
+#ifdef SIGPIPE
+ struct sigaction sa;
+
+ pa_zero(sa);
+
+ if (sigaction(SIGPIPE, NULL, &sa) < 0) {
+ pa_log("sigaction(): %s", pa_cstrerror(errno));
+ return;
+ }
+
+ sa.sa_handler = SIG_IGN;
+
+ if (sigaction(SIGPIPE, &sa, NULL) < 0) {
+ pa_log("sigaction(): %s", pa_cstrerror(errno));
+ return;
+ }
+#endif
+}
+
+void pa_xfreev(void**a) {
+ void **p;
+
+ if (!a)
+ return;
+
+ for (p = a; *p; p++)
+ pa_xfree(*p);
+
+ pa_xfree(a);
+}
+
+char **pa_split_spaces_strv(const char *s) {
+ char **t, *e;
+ unsigned i = 0, n = 8;
+ const char *state = NULL;
+
+ t = pa_xnew(char*, n);
+ while ((e = pa_split_spaces(s, &state))) {
+ t[i++] = e;
+
+ if (i >= n) {
+ n *= 2;
+ t = pa_xrenew(char*, t, n);
+ }
+ }
+
+ if (i <= 0) {
+ pa_xfree(t);
+ return NULL;
+ }
+
+ t[i] = NULL;
+ return t;
+}
+
+char* pa_maybe_prefix_path(const char *path, const char *prefix) {
+ pa_assert(path);
+
+ if (pa_is_path_absolute(path))
+ return pa_xstrdup(path);
+
+ return pa_sprintf_malloc("%s" PA_PATH_SEP "%s", prefix, path);
+}
+
+size_t pa_pipe_buf(int fd) {
+
+#ifdef _PC_PIPE_BUF
+ long n;
+
+ if ((n = fpathconf(fd, _PC_PIPE_BUF)) >= 0)
+ return (size_t) n;
+#endif
+
+#ifdef PIPE_BUF
+ return PIPE_BUF;
+#else
+ return 4096;
+#endif
+}
+
+void pa_reset_personality(void) {
+
+#ifdef __linux__
+ if (personality(PER_LINUX) < 0)
+ pa_log_warn("Uh, personality() failed: %s", pa_cstrerror(errno));
+#endif
+
+}
+
+#if defined(__linux__) && !defined(__OPTIMIZE__)
+
+pa_bool_t pa_run_from_build_tree(void) {
+ char *rp;
+ pa_bool_t b = FALSE;
+
+ /* We abuse __OPTIMIZE__ as a check whether we are a debug build
+ * or not. */
+
+ if ((rp = pa_readlink("/proc/self/exe"))) {
+ b = pa_startswith(rp, PA_BUILDDIR);
+ pa_xfree(rp);
+ }
+
+ return b;
+}
+
+#endif
+
+const char *pa_get_temp_dir(void) {
+ const char *t;
+
+ if ((t = getenv("TMPDIR")) &&
+ pa_is_path_absolute(t))
+ return t;
+
+ if ((t = getenv("TMP")) &&
+ pa_is_path_absolute(t))
+ return t;
+
+ if ((t = getenv("TEMP")) &&
+ pa_is_path_absolute(t))
+ return t;
+
+ if ((t = getenv("TEMPDIR")) &&
+ pa_is_path_absolute(t))
+ return t;
+
+ return "/tmp";
+}