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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Josef Cejka |
2 | * Copyright (C) 2006 Josef Cejka |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup libc |
29 | /** @addtogroup libc |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #include <stdarg.h> |
35 | #include <stdarg.h> |
36 | #include <stdio.h> |
36 | #include <stdio.h> |
37 | #include <string.h> |
37 | #include <string.h> |
38 | #include <io/printf_core.h> |
38 | #include <io/printf_core.h> |
39 | 39 | ||
40 | 40 | ||
41 | struct vsnprintf_data { |
41 | struct vsnprintf_data { |
42 | size_t size; /* total space for string */ |
42 | size_t size; /* total space for string */ |
43 | size_t len; /* count of currently used characters */ |
43 | size_t len; /* count of currently used characters */ |
44 | char *string; /* destination string */ |
44 | char *string; /* destination string */ |
45 | }; |
45 | }; |
46 | 46 | ||
47 | int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data); |
47 | int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data); |
48 | 48 | ||
49 | /** Write string to given buffer. |
49 | /** Write string to given buffer. |
50 | * Write at most data->size characters including trailing zero. According to C99 has snprintf to return number |
50 | * Write at most data->size characters including trailing zero. According to C99 has snprintf to return number |
51 | * of characters that would have been written if enough space had been available. Hence the return value is not |
51 | * of characters that would have been written if enough space had been available. Hence the return value is not |
52 | * number of really printed characters but size of input string. Number of really used characters |
52 | * number of really printed characters but size of input string. Number of really used characters |
53 | * is stored in data->len. |
53 | * is stored in data->len. |
54 | * @param str source string to print |
54 | * @param str source string to print |
55 | * @param count size of source string |
55 | * @param count size of source string |
56 | * @param data structure with destination string, counter of used space and total string size. |
56 | * @param data structure with destination string, counter of used space and total string size. |
57 | * @return number of characters to print (not characters really printed!) |
57 | * @return number of characters to print (not characters really printed!) |
58 | */ |
58 | */ |
59 | int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data) |
59 | int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data) |
60 | { |
60 | { |
61 | size_t i; |
61 | size_t i; |
62 | i = data->size - data->len; |
62 | i = data->size - data->len; |
63 | 63 | ||
64 | if (i == 0) { |
64 | if (i == 0) { |
65 | return count; |
65 | return count; |
66 | } |
66 | } |
67 | 67 | ||
68 | if (i == 1) { |
68 | if (i == 1) { |
69 | /* We have only one free byte left in buffer => write there trailing zero */ |
69 | /* We have only one free byte left in buffer => write there trailing zero */ |
70 | data->string[data->size - 1] = 0; |
70 | data->string[data->size - 1] = 0; |
71 | data->len = data->size; |
71 | data->len = data->size; |
72 | return count; |
72 | return count; |
73 | } |
73 | } |
74 | 74 | ||
75 | if (i <= count) { |
75 | if (i <= count) { |
76 | /* We have not enought space for whole string with the trailing zero => print only a part of string */ |
76 | /* We have not enought space for whole string with the trailing zero => print only a part of string */ |
77 | memcpy((void *)(data->string + data->len), (void *)str, i - 1); |
77 | memcpy((void *)(data->string + data->len), (void *)str, i - 1); |
78 | data->string[data->size - 1] = 0; |
78 | data->string[data->size - 1] = 0; |
79 | data->len = data->size; |
79 | data->len = data->size; |
80 | return count; |
80 | return count; |
81 | } |
81 | } |
82 | 82 | ||
83 | /* Buffer is big enought to print whole string */ |
83 | /* Buffer is big enought to print whole string */ |
84 | memcpy((void *)(data->string + data->len), (void *)str, count); |
84 | memcpy((void *)(data->string + data->len), (void *)str, count); |
85 | data->len += count; |
85 | data->len += count; |
86 | /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */ |
86 | /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */ |
87 | data->string[data->len] = 0; |
87 | data->string[data->len] = 0; |
88 | 88 | ||
89 | return count; |
89 | return count; |
90 | } |
90 | } |
91 | 91 | ||
92 | /** Print formatted to the given buffer with limited size. |
92 | /** Print formatted to the given buffer with limited size. |
93 | * @param str buffer |
93 | * @param str buffer |
94 | * @param size buffer size |
94 | * @param size buffer size |
95 | * @param fmt format string |
95 | * @param fmt format string |
96 | * \see For more details about format string see printf_core. |
96 | * \see For more details about format string see printf_core. |
97 | */ |
97 | */ |
98 | int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) |
98 | int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) |
99 | { |
99 | { |
100 | struct vsnprintf_data data = {size, 0, str}; |
100 | struct vsnprintf_data data = {size, 0, str}; |
101 | struct printf_spec ps = {(int(*)(void *, size_t, void *))vsnprintf_write, &data}; |
101 | struct printf_spec ps = {(int(*)(void *, size_t, void *))vsnprintf_write, &data}; |
102 | 102 | ||
103 | /* Print 0 at end of string - fix the case that nothing will be printed */ |
103 | /* Print 0 at end of string - fix the case that nothing will be printed */ |
104 | if (size > 0) |
104 | if (size > 0) |
105 | str[0] = 0; |
105 | str[0] = 0; |
106 | 106 | ||
107 | /* vsnprintf_write ensures that str will be terminated by zero. */ |
107 | /* vsnprintf_write ensures that str will be terminated by zero. */ |
108 | return printf_core(fmt, &ps, ap); |
108 | return printf_core(fmt, &ps, ap); |
109 | } |
109 | } |
110 | 110 | ||
111 | 111 | ||
112 | 112 | ||
113 | 113 | ||
114 | /** @} |
114 | /** @} |
115 | */ |
115 | */ |
116 | 116 | ||
117 | 117 | ||
118 | 118 |