source: libyaml/trunk/src/writer.c @ 239

Revision 239, 4.0 KB checked in by xi, 7 years ago (diff)

Add win32 fixes and project files for VC6.

RevLine 
[211]1
2#include "yaml_private.h"
3
4/*
5 * Declarations.
6 */
7
8static int
9yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem);
10
11YAML_DECLARE(int)
12yaml_emitter_flush(yaml_emitter_t *emitter);
13
14/*
15 * Set the writer error and return 0.
16 */
17
18static int
19yaml_emitter_set_writer_error(yaml_emitter_t *emitter, const char *problem)
20{
21    emitter->error = YAML_WRITER_ERROR;
22    emitter->problem = problem;
23
24    return 0;
25}
26
27/*
28 * Flush the output buffer.
29 */
30
31YAML_DECLARE(int)
32yaml_emitter_flush(yaml_emitter_t *emitter)
33{
34    int low, high;
35
36    assert(emitter);    /* Non-NULL emitter object is expected. */
37    assert(emitter->write_handler); /* Write handler must be set. */
38    assert(emitter->encoding);  /* Output encoding must be set. */
39
[214]40    emitter->buffer.last = emitter->buffer.pointer;
41    emitter->buffer.pointer = emitter->buffer.start;
42
[211]43    /* Check if the buffer is empty. */
44
45    if (emitter->buffer.start == emitter->buffer.last) {
46        return 1;
47    }
48
49    /* If the output encoding is UTF-8, we don't need to recode the buffer. */
50
51    if (emitter->encoding == YAML_UTF8_ENCODING)
52    {
53        if (emitter->write_handler(emitter->write_handler_data,
54                    emitter->buffer.start,
55                    emitter->buffer.last - emitter->buffer.start)) {
56            emitter->buffer.last = emitter->buffer.start;
57            emitter->buffer.pointer = emitter->buffer.start;
58            return 1;
59        }
60        else {
61            return yaml_emitter_set_writer_error(emitter, "Write error");
62        }
63    }
64
65    /* Recode the buffer into the raw buffer. */
66
67    low = (emitter->encoding == YAML_UTF16LE_ENCODING ? 0 : 1);
68    high = (emitter->encoding == YAML_UTF16LE_ENCODING ? 1 : 0);
69
70    while (emitter->buffer.pointer != emitter->buffer.last)
71    {
72        unsigned char octet;
73        unsigned int width;
74        unsigned int value;
[239]75        size_t k;
[211]76
77        /*
78         * See the "reader.c" code for more details on UTF-8 encoding.  Note
79         * that we assume that the buffer contains a valid UTF-8 sequence.
80         */
81
82        /* Read the next UTF-8 character. */
83
84        octet = emitter->buffer.pointer[0];
85
86        width = (octet & 0x80) == 0x00 ? 1 :
87                (octet & 0xE0) == 0xC0 ? 2 :
88                (octet & 0xF0) == 0xE0 ? 3 :
89                (octet & 0xF8) == 0xF0 ? 4 : 0;
90
91        value = (octet & 0x80) == 0x00 ? octet & 0x7F :
92                (octet & 0xE0) == 0xC0 ? octet & 0x1F :
93                (octet & 0xF0) == 0xE0 ? octet & 0x0F :
94                (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;
95
96        for (k = 1; k < width; k ++) {
97            octet = emitter->buffer.pointer[k];
98            value = (value << 6) + (octet & 0x3F);
99        }
100
101        emitter->buffer.pointer += width;
102
103        /* Write the character. */
104
105        if (value < 0x10000)
106        {
107            emitter->raw_buffer.last[high] = value >> 8;
108            emitter->raw_buffer.last[low] = value & 0xFF;
109
110            emitter->raw_buffer.last += 2;
111        }
112        else
113        {
114            /* Write the character using a surrogate pair (check "reader.c"). */
115
116            value -= 0x10000;
117            emitter->raw_buffer.last[high] = 0xD8 + (value >> 18);
118            emitter->raw_buffer.last[low] = (value >> 10) & 0xFF;
119            emitter->raw_buffer.last[high+2] = 0xDC + ((value >> 8) & 0xFF);
120            emitter->raw_buffer.last[low+2] = value & 0xFF;
121
122            emitter->raw_buffer.last += 4;
123        }
124    }
125
126    /* Write the raw buffer. */
127
128    if (emitter->write_handler(emitter->write_handler_data,
129                emitter->raw_buffer.start,
130                emitter->raw_buffer.last - emitter->raw_buffer.start)) {
131        emitter->buffer.last = emitter->buffer.start;
132        emitter->buffer.pointer = emitter->buffer.start;
133        emitter->raw_buffer.last = emitter->raw_buffer.start;
134        emitter->raw_buffer.pointer = emitter->raw_buffer.start;
135        return 1;
136    }
137    else {
138        return yaml_emitter_set_writer_error(emitter, "Write error");
139    }
140}
141
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