WebSVN – HelenOS – Diff – /trunk/kernel/generic/src/printf/vsnprintf.c



    size_t size;    /* Total size of the buffer (in bytes) */
    size_t len;     /* Number of already used bytes */
    char *dst;      /* Destination */
} vsnprintf_data_t;
 
/** Write string to given buffer.
 *
 * Write at most data->size plain characters including trailing zero.
 * According to C99, snprintf() has to return number of characters that
 * would have been written if enough space had been available. Hence
 * the return value is not the number of actually printed characters
 * but size of the input string.
 *
 * @param str  Source string to print.
 * @param size Number of plain characters in str.
 * @param data Structure describing destination string, counter
 *             of used space and total string size.
 *
 * @return Number of characters to print (not characters actually
 *         printed).
 *
 */
static int vsnprintf_str_write(const char *str, size_t size, vsnprintf_data_t *data)
{
    size_t left = data->size - data->len;
   
    if (left == 0)
        return ((int) size);

         * of string
         */
        index_t index = 0;
       
        while (index < size) {
            wchar_t uc = str_decode(str, &index, size);
           
            if (chr_encode(uc, data->dst, &data->len, data->size - 1) != EOK)
                break;
        }
       
        /* Put trailing zero at end, but not count it

    data->dst[data->len] = 0;
   
    return ((int) size);
}
 
/** Write wide string to given buffer.
 *
 * Write at most data->size plain characters including trailing zero.
 * According to C99, snprintf() has to return number of characters that
 * would have been written if enough space had been available. Hence
 * the return value is not the number of actually printed characters
 * but size of the input string.
 *
 * @param str  Source wide string to print.
 * @param size Number of bytes in str.
 * @param data Structure describing destination string, counter
 *             of used space and total string size.
 *
 * @return Number of wide characters to print (not characters actually
 *         printed).
 *
 */
static int vsnprintf_wstr_write(const wchar_t *str, size_t size, vsnprintf_data_t *data)
{
    index_t index = 0;
   
    while (index < (size / sizeof(wchar_t))) {
        size_t left = data->size - data->len;

        size,
        0,
        str
    };
    printf_spec_t ps = {
        (int(*) (const char *, size_t, void *)) vsnprintf_str_write,
        (int(*) (const wchar_t *, size_t, void *)) vsnprintf_wstr_write,
        &data
    };
   
    /* Print 0 at end of string - fix the case that nothing will be printed */
    if (size > 0)

Rev 4208	Rev 4213
Line 42...	Line 42...
42	size_t size; /* Total size of the buffer (in bytes) */	42	size_t size; /* Total size of the buffer (in bytes) */
43	size_t len; /* Number of already used bytes */	43	size_t len; /* Number of already used bytes */
44	char dst; / Destination */	44	char dst; / Destination */
45	} vsnprintf_data_t;	45	} vsnprintf_data_t;
46		46
47	/** Write UTF-8 string to given buffer.	47	/** Write string to given buffer.
48	*	48	*
49	* Write at most data->size plain characters including trailing zero.	49	* Write at most data->size plain characters including trailing zero.
50	* According to C99, snprintf() has to return number of characters that	50	* According to C99, snprintf() has to return number of characters that
51	* would have been written if enough space had been available. Hence	51	* would have been written if enough space had been available. Hence
52	* the return value is not the number of actually printed characters	52	* the return value is not the number of actually printed characters
53	* but size of the input string.	53	* but size of the input string.
54	*	54	*
55	* @param str Source UTF-8 string to print.	55	* @param str Source string to print.
56	* @param size Number of plain characters in str.	56	* @param size Number of plain characters in str.
57	* @param data Structure describing destination string, counter	57	* @param data Structure describing destination string, counter
58	* of used space and total string size.	58	* of used space and total string size.
59	*	59	*
60	* @return Number of UTF-8 characters to print (not characters actually	60	* @return Number of characters to print (not characters actually
61	* printed).	61	* printed).
62	*	62	*
63	*/	63	*/
64	static int vsnprintf_write_utf8(const char str, size_t size, vsnprintf_data_t data)	64	static int vsnprintf_str_write(const char str, size_t size, vsnprintf_data_t data)
65	{	65	{
66	size_t left = data->size - data->len;	66	size_t left = data->size - data->len;
67		67
68	if (left == 0)	68	if (left == 0)
69	return ((int) size);	69	return ((int) size);
Line 83...	Line 83...
83	* of string	83	* of string
84	*/	84	*/
85	index_t index = 0;	85	index_t index = 0;
86		86
87	while (index < size) {	87	while (index < size) {
88	wchar_t uc = chr_decode(str, &index, size);	88	wchar_t uc = str_decode(str, &index, size);
89		89
90	if (chr_encode(uc, data->dst, &data->len, data->size - 1) != EOK)	90	if (chr_encode(uc, data->dst, &data->len, data->size - 1) != EOK)
91	break;	91	break;
92	}	92	}
93		93
94	/* Put trailing zero at end, but not count it	94	/* Put trailing zero at end, but not count it
Line 109...	Line 109...
109	data->dst[data->len] = 0;	109	data->dst[data->len] = 0;
110		110
111	return ((int) size);	111	return ((int) size);
112	}	112	}
113		113
114	/** Write UTF-32 string to given buffer.	114	/** Write wide string to given buffer.
115	*	115	*
116	* Write at most data->size plain characters including trailing zero.	116	* Write at most data->size plain characters including trailing zero.
117	* According to C99, snprintf() has to return number of characters that	117	* According to C99, snprintf() has to return number of characters that
118	* would have been written if enough space had been available. Hence	118	* would have been written if enough space had been available. Hence
119	* the return value is not the number of actually printed characters	119	* the return value is not the number of actually printed characters
120	* but size of the input string.	120	* but size of the input string.
121	*	121	*
122	* @param str Source UTF-32 string to print.	122	* @param str Source wide string to print.
123	* @param size Number of bytes in str.	123	* @param size Number of bytes in str.
124	* @param data Structure describing destination string, counter	124	* @param data Structure describing destination string, counter
125	* of used space and total string size.	125	* of used space and total string size.
126	*	126	*
127	* @return Number of UTF-8 characters to print (not characters actually	127	* @return Number of wide characters to print (not characters actually
128	* printed).	128	* printed).
129	*	129	*
130	*/	130	*/
131	static int vsnprintf_write_utf32(const wchar_t str, size_t size, vsnprintf_data_t data)	131	static int vsnprintf_wstr_write(const wchar_t str, size_t size, vsnprintf_data_t data)
132	{	132	{
133	index_t index = 0;	133	index_t index = 0;
134		134
135	while (index < (size / sizeof(wchar_t))) {	135	while (index < (size / sizeof(wchar_t))) {
136	size_t left = data->size - data->len;	136	size_t left = data->size - data->len;
Line 167...	Line 167...
167	size,	167	size,
168	0,	168	0,
169	str	169	str
170	};	170	};
171	printf_spec_t ps = {	171	printf_spec_t ps = {
172	(int() (const char , size_t, void *)) vsnprintf_write_utf8,	172	(int() (const char , size_t, void *)) vsnprintf_str_write,
173	(int() (const wchar_t , size_t, void *)) vsnprintf_write_utf32,	173	(int() (const wchar_t , size_t, void *)) vsnprintf_wstr_write,
174	&data	174	&data
175	};	175	};
176		176
177	/* Print 0 at end of string - fix the case that nothing will be printed */	177	/* Print 0 at end of string - fix the case that nothing will be printed */
178	if (size > 0)	178	if (size > 0)

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/printf/vsnprintf.c – Rev 4208 → 4213