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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 | struct vsnprintf_data { |
40 | struct vsnprintf_data { |
41 | size_t size; /* total space for string */ |
41 | size_t size; /* total space for string */ |
42 | size_t len; /* count of currently used characters */ |
42 | size_t len; /* count of currently used characters */ |
43 | char *string; /* destination string */ |
43 | char *string; /* destination string */ |
44 | }; |
44 | }; |
45 | 45 | ||
46 | /** Write string to given buffer. |
46 | /** Write string to given buffer. |
47 | * Write at most data->size characters including trailing zero. According to C99 has snprintf to return number |
47 | * Write at most data->size characters including trailing zero. According to C99 has snprintf to return number |
48 | * of characters that would have been written if enough space had been available. Hence the return value is not |
48 | * of characters that would have been written if enough space had been available. Hence the return value is not |
49 | * number of really printed characters but size of input string. Number of really used characters |
49 | * number of really printed characters but size of input string. Number of really used characters |
50 | * is stored in data->len. |
50 | * is stored in data->len. |
51 | * @param str source string to print |
51 | * @param str source string to print |
52 | * @param count size of source string |
52 | * @param count size of source string |
53 | * @param data structure with destination string, counter of used space and total string size. |
53 | * @param data structure with destination string, counter of used space and total string size. |
54 | * @return number of characters to print (not characters really printed!) |
54 | * @return number of characters to print (not characters really printed!) |
55 | */ |
55 | */ |
56 | static int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data) |
56 | static int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data) |
57 | { |
57 | { |
58 | size_t i; |
58 | size_t i; |
59 | i = data->size - data->len; |
59 | i = data->size - data->len; |
60 | 60 | ||
61 | if (i == 0) { |
61 | if (i == 0) { |
62 | return count; |
62 | return count; |
63 | } |
63 | } |
64 | 64 | ||
65 | if (i == 1) { |
65 | if (i == 1) { |
66 | /* We have only one free byte left in buffer => write there trailing zero */ |
66 | /* We have only one free byte left in buffer => write there trailing zero */ |
67 | data->string[data->size - 1] = 0; |
67 | data->string[data->size - 1] = 0; |
68 | data->len = data->size; |
68 | data->len = data->size; |
69 | return count; |
69 | return count; |
70 | } |
70 | } |
71 | 71 | ||
72 | if (i <= count) { |
72 | if (i <= count) { |
73 | /* We have not enought space for whole string with the trailing zero => print only a part of string */ |
73 | /* We have not enought space for whole string with the trailing zero => print only a part of string */ |
74 | memcpy((void *)(data->string + data->len), (void *)str, i - 1); |
74 | memcpy((void *)(data->string + data->len), (void *)str, i - 1); |
75 | data->string[data->size - 1] = 0; |
75 | data->string[data->size - 1] = 0; |
76 | data->len = data->size; |
76 | data->len = data->size; |
77 | return count; |
77 | return count; |
78 | } |
78 | } |
79 | 79 | ||
80 | /* Buffer is big enought to print whole string */ |
80 | /* Buffer is big enought to print whole string */ |
81 | memcpy((void *)(data->string + data->len), (void *)str, count); |
81 | memcpy((void *)(data->string + data->len), (void *)str, count); |
82 | data->len += count; |
82 | data->len += count; |
83 | /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */ |
83 | /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */ |
84 | data->string[data->len] = 0; |
84 | data->string[data->len] = 0; |
85 | 85 | ||
86 | return count; |
86 | return count; |
87 | } |
87 | } |
88 | 88 | ||
89 | /** Print formatted to the given buffer with limited size. |
89 | /** Print formatted to the given buffer with limited size. |
90 | * @param str buffer |
90 | * @param str buffer |
91 | * @param size buffer size |
91 | * @param size buffer size |
92 | * @param fmt format string |
92 | * @param fmt format string |
93 | * \see For more details about format string see printf_core. |
93 | * \see For more details about format string see printf_core. |
94 | */ |
94 | */ |
95 | int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) |
95 | int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) |
96 | { |
96 | { |
97 | struct vsnprintf_data data = {size, 0, str}; |
97 | struct vsnprintf_data data = {size, 0, str}; |
98 | struct printf_spec ps = {(int(*)(void *, size_t, void *)) vsnprintf_write, &data}; |
98 | struct printf_spec ps = {(int(*)(void *, size_t, void *)) vsnprintf_write, &data}; |
99 | 99 | ||
100 | /* Print 0 at end of string - fix the case that nothing will be printed */ |
100 | /* Print 0 at end of string - fix the case that nothing will be printed */ |
101 | if (size > 0) |
101 | if (size > 0) |
102 | str[0] = 0; |
102 | str[0] = 0; |
103 | 103 | ||
104 | /* vsnprintf_write ensures that str will be terminated by zero. */ |
104 | /* vsnprintf_write ensures that str will be terminated by zero. */ |
105 | return printf_core(fmt, &ps, ap); |
105 | return printf_core(fmt, &ps, ap); |
106 | } |
106 | } |
107 | 107 | ||
108 | /** @} |
108 | /** @} |
109 | */ |
109 | */ |
110 | 110 |