#define _GNU_SOURCE
#include <assert.h>
-#include <config.h>
#include <ctype.h>
-#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <inttypes.h>
#include <common/defaults.h>
#include <common/error.h>
#include <common/utils.h>
#include "config.h"
+#include "config-internal.h"
struct handler_filter_args {
const char* section;
const char * const config_str_no = "no";
const char * const config_str_false = "false";
const char * const config_str_off = "off";
+const char * const config_xml_encoding = "UTF-8";
+/* Size of the encoding's largest character */
+const size_t config_xml_encoding_bytes_per_char = 2;
+const char * const config_xml_indent_string = "\t";
+const char * const config_xml_true = "true";
+const char * const config_xml_false = "false";
static int config_entry_handler_filter(struct handler_filter_args *args,
const char *section, const char *name, const char *value)
end:
return ret;
}
+
+/*
+ * Returns a xmlChar string which must be released using xmlFree().
+ */
+static xmlChar *encode_string(const char *in_str)
+{
+ xmlChar *out_str = NULL;
+ xmlCharEncodingHandlerPtr handler;
+ int out_len, ret, in_len;
+
+ assert(in_str);
+
+ handler = xmlFindCharEncodingHandler(config_xml_encoding);
+ if (!handler) {
+ ERR("xmlFindCharEncodingHandler return NULL!. Configure issue!");
+ goto end;
+ }
+
+ in_len = strlen(in_str);
+ /*
+ * Add 1 byte for the NULL terminted character. The factor 2 here is
+ * because UTF-8 can be on two bytes so this fits the worst case for each
+ * bytes.
+ */
+ out_len = (in_len * 2) + 1;
+ out_str = xmlMalloc(out_len);
+ if (!out_str) {
+ goto end;
+ }
+
+ ret = handler->input(out_str, &out_len, (const xmlChar *) in_str, &in_len);
+ if (ret < 0) {
+ xmlFree(out_str);
+ out_str = NULL;
+ goto end;
+ }
+
+ /* out_len is now the size of out_str */
+ out_str[out_len] = '\0';
+end:
+ return out_str;
+}
+
+LTTNG_HIDDEN
+struct config_writer *config_writer_create(int fd_output)
+{
+ int ret;
+ struct config_writer *writer;
+ xmlOutputBufferPtr buffer;
+
+ writer = zmalloc(sizeof(struct config_writer));
+ if (!writer) {
+ PERROR("zmalloc config_writer_create");
+ goto end;
+ }
+
+ buffer = xmlOutputBufferCreateFd(fd_output, NULL);
+ if (!buffer) {
+ goto error_destroy;
+ }
+
+ writer->writer = xmlNewTextWriter(buffer);
+ ret = xmlTextWriterStartDocument(writer->writer, NULL,
+ config_xml_encoding, NULL);
+ if (ret < 0) {
+ goto error_destroy;
+ }
+
+ ret = xmlTextWriterSetIndentString(writer->writer,
+ BAD_CAST config_xml_indent_string);
+ if (ret) {
+ goto error_destroy;
+ }
+
+ ret = xmlTextWriterSetIndent(writer->writer, 1);
+ if (ret) {
+ goto error_destroy;
+ }
+
+end:
+ return writer;
+error_destroy:
+ config_writer_destroy(writer);
+ return NULL;
+}
+
+LTTNG_HIDDEN
+int config_writer_destroy(struct config_writer *writer)
+{
+ int ret = 0;
+
+ if (!writer) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ if (xmlTextWriterEndDocument(writer->writer) < 0) {
+ WARN("Could not close XML document");
+ ret = -EIO;
+ }
+
+ if (writer->writer) {
+ xmlFreeTextWriter(writer->writer);
+ }
+
+ free(writer);
+end:
+ return ret;
+}
+
+LTTNG_HIDDEN
+int config_writer_open_element(struct config_writer *writer,
+ const char *element_name)
+{
+ int ret;
+ xmlChar *encoded_element_name;
+
+ if (!writer || !writer->writer || !element_name || !element_name[0]) {
+ ret = -1;
+ goto end;
+ }
+
+ encoded_element_name = encode_string(element_name);
+ if (!encoded_element_name) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = xmlTextWriterStartElement(writer->writer, encoded_element_name);
+ xmlFree(encoded_element_name);
+end:
+ return ret > 0 ? 0 : ret;
+}
+
+LTTNG_HIDDEN
+int config_writer_close_element(struct config_writer *writer)
+{
+ int ret;
+
+ if (!writer || !writer->writer) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = xmlTextWriterEndElement(writer->writer);
+end:
+ return ret > 0 ? 0 : ret;
+}
+
+LTTNG_HIDDEN
+int config_writer_write_element_unsigned_int(struct config_writer *writer,
+ const char *element_name, uint64_t value)
+{
+ int ret;
+ xmlChar *encoded_element_name;
+
+ if (!writer || !writer->writer || !element_name || !element_name[0]) {
+ ret = -1;
+ goto end;
+ }
+
+ encoded_element_name = encode_string(element_name);
+ if (!encoded_element_name) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = xmlTextWriterWriteFormatElement(writer->writer,
+ encoded_element_name, "%" PRIu64, value);
+ xmlFree(encoded_element_name);
+end:
+ return ret > 0 ? 0 : ret;
+}
+
+LTTNG_HIDDEN
+int config_writer_write_element_signed_int(struct config_writer *writer,
+ const char *element_name, int64_t value)
+{
+ int ret;
+ xmlChar *encoded_element_name;
+
+ if (!writer || !writer->writer || !element_name || !element_name[0]) {
+ ret = -1;
+ goto end;
+ }
+
+ encoded_element_name = encode_string(element_name);
+ if (!encoded_element_name) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = xmlTextWriterWriteFormatElement(writer->writer,
+ encoded_element_name, "%" PRIi64, value);
+ xmlFree(encoded_element_name);
+end:
+ return ret > 0 ? 0 : ret;
+}
+
+LTTNG_HIDDEN
+int config_writer_write_element_bool(struct config_writer *writer,
+ const char *element_name, int value)
+{
+ return config_writer_write_element_string(writer, element_name,
+ value ? config_xml_true : config_xml_false);
+}
+
+LTTNG_HIDDEN
+int config_writer_write_element_string(struct config_writer *writer,
+ const char *element_name, const char *value)
+{
+ int ret;
+ xmlChar *encoded_element_name = NULL;
+ xmlChar *encoded_value = NULL;
+
+ if (!writer || !writer->writer || !element_name || !element_name[0] ||
+ !value) {
+ ret = -1;
+ goto end;
+ }
+
+ encoded_element_name = encode_string(element_name);
+ if (!encoded_element_name) {
+ ret = -1;
+ goto end;
+ }
+
+ encoded_value = encode_string(value);
+ if (!encoded_value) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = xmlTextWriterWriteElement(writer->writer, encoded_element_name,
+ encoded_value);
+end:
+ xmlFree(encoded_element_name);
+ xmlFree(encoded_value);
+ return ret > 0 ? 0 : ret;
+}
#include <common/config/ini.h>
#include <common/macros.h>
+#include <stdint.h>
struct config_entry {
/* section is NULL if the entry is not in a section */
const char *value;
};
+/* Instance of a configuration writer. */
+struct config_writer;
+
/*
* A config_entry_handler_cb receives config_entry structures belonging to the
* sections the handler has been registered to.
LTTNG_HIDDEN
int config_parse_value(const char *value);
+/*
+ * Create an instance of a configuration writer.
+ *
+ * fd_output File to which the XML content must be written. The file will be
+ * closed once the config_writer has been destroyed.
+ *
+ * Returns an instance of a configuration writer on success, NULL on
+ * error.
+ */
+LTTNG_HIDDEN
+struct config_writer *config_writer_create(int fd_output);
+
+/*
+ * Destroy an instance of a configuration writer.
+ *
+ * writer An instance of a configuration writer.
+ *
+ * Returns zero if the XML document could be closed cleanly. Negative values
+ * indicate an error.
+ */
+LTTNG_HIDDEN
+int config_writer_destroy(struct config_writer *writer);
+
+/*
+ * Open an element tag.
+ *
+ * writer An instance of a configuration writer.
+ *
+ * element_name Element tag name.
+ *
+ * Returns zero if the XML document could be closed cleanly.
+ * Negative values indicate an error.
+ */
+LTTNG_HIDDEN
+int config_writer_open_element(struct config_writer *writer,
+ const char *element_name);
+
+/*
+ * Close the current element tag.
+ *
+ * writer An instance of a configuration writer.
+ *
+ * Returns zero if the XML document could be closed cleanly.
+ * Negative values indicate an error.
+ */
+LTTNG_HIDDEN
+int config_writer_close_element(struct config_writer *writer);
+
+/*
+ * Write an element of type unsigned int.
+ *
+ * writer An instance of a configuration writer.
+ *
+ * element_name Element name.
+ *
+ * value Unsigned int value of the element
+ *
+ * Returns zero if the element's value could be written.
+ * Negative values indicate an error.
+ */
+LTTNG_HIDDEN
+int config_writer_write_element_unsigned_int(struct config_writer *writer,
+ const char *element_name, uint64_t value);
+
+/*
+ * Write an element of type signed int.
+ *
+ * writer An instance of a configuration writer.
+ *
+ * element_name Element name.
+ *
+ * value Signed int value of the element
+ *
+ * Returns zero if the element's value could be written.
+ * Negative values indicate an error.
+ */LTTNG_HIDDEN
+int config_writer_write_element_signed_int(struct config_writer *writer,
+ const char *element_name, int64_t value);
+
+/*
+ * Write an element of type boolean.
+ *
+ * writer An instance of a configuration writer.
+ *
+ * element_name Element name.
+ *
+ * value Boolean value of the element
+ *
+ * Returns zero if the element's value could be written.
+ * Negative values indicate an error.
+ */
+LTTNG_HIDDEN
+int config_writer_write_element_bool(struct config_writer *writer,
+ const char *element_name, int value);
+
+/*
+ * Write an element of type string.
+ *
+ * writer An instance of a configuration writer.
+ *
+ * element_name Element name.
+ *
+ * value String value of the element
+ *
+ * Returns zero if the element's value could be written.
+ * Negative values indicate an error.
+ */
+LTTNG_HIDDEN
+int config_writer_write_element_string(struct config_writer *writer,
+ const char *element_name, const char *value);
+
#endif /* _CONFIG_H */
projects / lttng-tools.git / commitdiff
