/src/libyaml/writer.c
https://code.google.com/ · C · 141 lines · 88 code · 33 blank · 20 comment · 22 complexity · ede6fecf08c77109b81f1054d4224a91 MD5 · raw file
- #include "yaml_private.h"
- /*
- * Declarations.
- */
- static int
- yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem);
- YAML_DECLARE(int)
- yaml_emitter_flush(yaml_emitter_t *emitter);
- /*
- * Set the writer error and return 0.
- */
- static int
- yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem)
- {
- emitter->error = YAML_WRITER_ERROR;
- emitter->problem = problem;
- return 0;
- }
- /*
- * Flush the output buffer.
- */
- YAML_DECLARE(int)
- yaml_emitter_flush(yaml_emitter_t *emitter)
- {
- int low, high;
- assert(emitter); /* Non-NULL emitter object is expected. */
- assert(emitter->write_handler); /* Write handler must be set. */
- assert(emitter->encoding); /* Output encoding must be set. */
- emitter->buffer.last = emitter->buffer.pointer;
- emitter->buffer.pointer = emitter->buffer.start;
- /* Check if the buffer is empty. */
- if (emitter->buffer.start == emitter->buffer.last) {
- return 1;
- }
- /* If the output encoding is UTF-8, we don't need to recode the buffer. */
- if (emitter->encoding == YAML_UTF8_ENCODING)
- {
- if (emitter->write_handler(emitter->write_handler_data,
- emitter->buffer.start,
- emitter->buffer.last - emitter->buffer.start)) {
- emitter->buffer.last = emitter->buffer.start;
- emitter->buffer.pointer = emitter->buffer.start;
- return 1;
- }
- else {
- return yaml_emitter_set_writer_error(emitter, "write error");
- }
- }
- /* Recode the buffer into the raw buffer. */
- low = (emitter->encoding == YAML_UTF16LE_ENCODING ? 0 : 1);
- high = (emitter->encoding == YAML_UTF16LE_ENCODING ? 1 : 0);
- while (emitter->buffer.pointer != emitter->buffer.last)
- {
- unsigned char octet;
- unsigned int width;
- unsigned int value;
- size_t k;
- /*
- * See the "reader.c" code for more details on UTF-8 encoding. Note
- * that we assume that the buffer contains a valid UTF-8 sequence.
- */
- /* Read the next UTF-8 character. */
- octet = emitter->buffer.pointer[0];
- width = (octet & 0x80) == 0x00 ? 1 :
- (octet & 0xE0) == 0xC0 ? 2 :
- (octet & 0xF0) == 0xE0 ? 3 :
- (octet & 0xF8) == 0xF0 ? 4 : 0;
- value = (octet & 0x80) == 0x00 ? octet & 0x7F :
- (octet & 0xE0) == 0xC0 ? octet & 0x1F :
- (octet & 0xF0) == 0xE0 ? octet & 0x0F :
- (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
- for (k = 1; k < width; k ++) {
- octet = emitter->buffer.pointer[k];
- value = (value << 6) + (octet & 0x3F);
- }
- emitter->buffer.pointer += width;
- /* Write the character. */
- if (value < 0x10000)
- {
- emitter->raw_buffer.last[high] = value >> 8;
- emitter->raw_buffer.last[low] = value & 0xFF;
- emitter->raw_buffer.last += 2;
- }
- else
- {
- /* Write the character using a surrogate pair (check "reader.c"). */
- value -= 0x10000;
- emitter->raw_buffer.last[high] = 0xD8 + (value >> 18);
- emitter->raw_buffer.last[low] = (value >> 10) & 0xFF;
- emitter->raw_buffer.last[high+2] = 0xDC + ((value >> 8) & 0xFF);
- emitter->raw_buffer.last[low+2] = value & 0xFF;
- emitter->raw_buffer.last += 4;
- }
- }
- /* Write the raw buffer. */
- if (emitter->write_handler(emitter->write_handler_data,
- emitter->raw_buffer.start,
- emitter->raw_buffer.last - emitter->raw_buffer.start)) {
- emitter->buffer.last = emitter->buffer.start;
- emitter->buffer.pointer = emitter->buffer.start;
- emitter->raw_buffer.last = emitter->raw_buffer.start;
- emitter->raw_buffer.pointer = emitter->raw_buffer.start;
- return 1;
- }
- else {
- return yaml_emitter_set_writer_error(emitter, "write error");
- }
- }