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authorMattias Andrée <maandree@member.fsf.org>2016-01-02 21:50:29 +0100
committerMattias Andrée <maandree@member.fsf.org>2016-01-02 21:50:29 +0100
commit3567c7b73a193cf64793efe59416321e290de7ba (patch)
tree5994cc58e9b0570e4b2144d3a0b116378c3ca6f6 /src
parenttypo (diff)
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marshal settings
Signed-off-by: Mattias Andrée <maandree@member.fsf.org>
Diffstat (limited to 'src')
-rw-r--r--src/settings.c76
-rw-r--r--src/settings.h21
2 files changed, 97 insertions, 0 deletions
diff --git a/src/settings.c b/src/settings.c
index 1eba1cc..0333a41 100644
--- a/src/settings.c
+++ b/src/settings.c
@@ -244,3 +244,79 @@ fail:
exit(1);
}
+
+/**
+ * Marshal settings into a buffer.
+ *
+ * @param buffer The buffer, `NULL` if you want to know the required size.
+ * @param settings The settings to marshal.
+ * @return The size of the output.
+ */
+size_t
+marshal_settings(char *buffer, const struct settings *settings)
+{
+#define MARSHAL(N, DATUMP) (n += aux = (N), (buf ? (memcpy(buf, DATUMP, aux), buf += aux, 0) : 0))
+
+ size_t n = 0, i = 0;
+ size_t aux;
+ char *buf = buffer;
+
+ if (buffer) i = marshal_settings(NULL, settings);
+ MARSHAL(sizeof(i), &i);
+
+ MARSHAL(sizeof(*settings), settings);
+ if (settings->hookpath)
+ MARSHAL(strlen(settings->hookpath) + 1, settings->hookpath);
+ if (settings->monitors_arg)
+ MARSHAL(settings->monitors_n, settings->monitors_arg);
+ for (i = 0; i < settings->monitors_n; i++)
+ MARSHAL(strlen(settings->monitors_id[i]) + 1, settings->monitors_id[i]);
+
+ return n;
+}
+
+
+/**
+ * Unmarshal settings from a buffer.
+ *
+ * @param buffer The buffer.
+ * @param settings Output parameter for the settings, will be allocated.
+ * @return The number of unmarshalled bytes, 0 on error.
+ */
+size_t
+unmarshal_settings(char *buffer, struct settings **settings)
+{
+#define UNMARSHAL(N, DATUMP) (aux = (N), memcpy((DATUMP), buf, aux), buf += aux)
+
+ size_t n, aux, i;
+ struct settings *s = NULL;
+ struct settings s_;
+ char *buf = buffer;
+ int saved_errno;
+
+ UNMARSHAL(sizeof(n), &n);
+ if (!(s = *settings = malloc(n - sizeof(n)))) return 0;
+ s->monitors_id = NULL, s->monitors_arg = NULL;
+
+ UNMARSHAL(sizeof(s_), &s_);
+ if (s_.monitors_n) {
+ if (!(*s = s_, s->monitors_id = malloc(s_.monitors_n * sizeof(char*)))) goto fail;
+ if (!(*s = s_, s->monitors_arg = malloc(s_.monitors_n * sizeof(char)))) goto fail;
+ }
+
+ s->hookpath = buf;
+ buf = strchr(buf, '\0') + 1;
+
+ UNMARSHAL(s_.monitors_n, s->monitors_arg);
+ for (i = 0; i < s_.monitors_n; i++)
+ UNMARSHAL(strlen(buf + 1), s->monitors_id[i]);
+
+ return n;
+
+fail:
+ saved_errno = errno;
+ free(s->monitors_id), free(s->monitors_arg), free(s), *settings = NULL;
+ errno = saved_errno;
+ return 0;
+}
+
diff --git a/src/settings.h b/src/settings.h
index b1909bb..980c6f6 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -91,6 +91,7 @@ struct settings {
/**
* Pathname to the hook script.
+ * Do not free this.
*/
char *hookpath;
@@ -122,6 +123,7 @@ struct settings {
/**
* Values for -d, -e, and -m, in order.
+ * Do not free its elements.
*/
char **monitors_id;
@@ -144,3 +146,22 @@ struct settings {
*/
void parse_command_line(int argc, char *argv[], struct settings *settings);
+
+/**
+ * Marshal settings into a buffer.
+ *
+ * @param param The buffer, `NULL` if you want to know the required size.
+ * @param settings The settings to marshal.
+ * @return The size of the output.
+ */
+size_t marshal_settings(char *buffer, const struct settings *settings);
+
+/**
+ * Unmarshal settings from a buffer.
+ *
+ * @param buffer The buffer.
+ * @param settings Output parameter for the settings, will be allocated.
+ * @return The number of unmarshalled bytes, 0 on error.
+ */
+size_t unmarshal_settings(char *buffer, struct settings **settings);
+