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authorLuke Shumaker <lukeshu@sbcglobal.net>2016-06-12 18:21:06 -0400
committerLuke Shumaker <lukeshu@sbcglobal.net>2016-06-12 18:21:06 -0400
commitba0b7413cf3e34eac57de84043f6be2ed5025a84 (patch)
tree50c91fff0d7182eff31fa610de10b25242069bc0 /src/libshared/specifier.c
parent519b1e985b2dec67522be81621b2ce2b6350ee70 (diff)
./move.sh
Diffstat (limited to 'src/libshared/specifier.c')
-rw-r--r--src/libshared/specifier.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/src/libshared/specifier.c b/src/libshared/specifier.c
new file mode 100644
index 0000000000..303ddf0401
--- /dev/null
+++ b/src/libshared/specifier.c
@@ -0,0 +1,188 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/utsname.h>
+
+#include <systemd/sd-id128.h>
+
+#include "alloc-util.h"
+#include "hostname-util.h"
+#include "macro.h"
+#include "specifier.h"
+#include "string-util.h"
+
+/*
+ * Generic infrastructure for replacing %x style specifiers in
+ * strings. Will call a callback for each replacement.
+ *
+ */
+
+int specifier_printf(const char *text, const Specifier table[], void *userdata, char **_ret) {
+ char *ret, *t;
+ const char *f;
+ bool percent = false;
+ size_t l;
+ int r;
+
+ assert(text);
+ assert(table);
+
+ l = strlen(text);
+ ret = new(char, l+1);
+ if (!ret)
+ return -ENOMEM;
+
+ t = ret;
+
+ for (f = text; *f; f++, l--) {
+
+ if (percent) {
+ if (*f == '%')
+ *(t++) = '%';
+ else {
+ const Specifier *i;
+
+ for (i = table; i->specifier; i++)
+ if (i->specifier == *f)
+ break;
+
+ if (i->lookup) {
+ _cleanup_free_ char *w = NULL;
+ char *n;
+ size_t k, j;
+
+ r = i->lookup(i->specifier, i->data, userdata, &w);
+ if (r < 0) {
+ free(ret);
+ return r;
+ }
+
+ j = t - ret;
+ k = strlen(w);
+
+ n = new(char, j + k + l + 1);
+ if (!n) {
+ free(ret);
+ return -ENOMEM;
+ }
+
+ memcpy(n, ret, j);
+ memcpy(n + j, w, k);
+
+ free(ret);
+
+ ret = n;
+ t = n + j + k;
+ } else {
+ *(t++) = '%';
+ *(t++) = *f;
+ }
+ }
+
+ percent = false;
+ } else if (*f == '%')
+ percent = true;
+ else
+ *(t++) = *f;
+ }
+
+ *t = 0;
+ *_ret = ret;
+ return 0;
+}
+
+/* Generic handler for simple string replacements */
+
+int specifier_string(char specifier, void *data, void *userdata, char **ret) {
+ char *n;
+
+ n = strdup(strempty(data));
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}
+
+int specifier_machine_id(char specifier, void *data, void *userdata, char **ret) {
+ sd_id128_t id;
+ char *n;
+ int r;
+
+ r = sd_id128_get_machine(&id);
+ if (r < 0)
+ return r;
+
+ n = new(char, 33);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = sd_id128_to_string(id, n);
+ return 0;
+}
+
+int specifier_boot_id(char specifier, void *data, void *userdata, char **ret) {
+ sd_id128_t id;
+ char *n;
+ int r;
+
+ r = sd_id128_get_boot(&id);
+ if (r < 0)
+ return r;
+
+ n = new(char, 33);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = sd_id128_to_string(id, n);
+ return 0;
+}
+
+int specifier_host_name(char specifier, void *data, void *userdata, char **ret) {
+ char *n;
+
+ n = gethostname_malloc();
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}
+
+int specifier_kernel_release(char specifier, void *data, void *userdata, char **ret) {
+ struct utsname uts;
+ char *n;
+ int r;
+
+ r = uname(&uts);
+ if (r < 0)
+ return -errno;
+
+ n = strdup(uts.release);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}