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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 generic |
29 | /** @addtogroup generic |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #include <print.h> |
35 | #include <print.h> |
36 | #include <printf/printf_core.h> |
36 | #include <printf/printf_core.h> |
37 | #include <memstr.h> |
37 | #include <memstr.h> |
38 | 38 | ||
39 | struct vsnprintf_data { |
39 | struct vsnprintf_data { |
40 | size_t size; /* total space for string */ |
40 | size_t size; /* total space for string */ |
41 | size_t len; /* count of currently used characters */ |
41 | size_t len; /* count of currently used characters */ |
42 | char *string; /* destination string */ |
42 | char *string; /* destination string */ |
43 | }; |
43 | }; |
44 | 44 | ||
45 | /** Write string to given buffer. |
45 | /** Write string to given buffer. |
46 | * Write at most data->size characters including trailing zero. According to C99, snprintf() has to return number |
46 | * Write at most data->size characters including trailing zero. According to C99, snprintf() has to return number |
47 | * of characters that would have been written if enough space had been available. Hence the return value is not |
47 | * of characters that would have been written if enough space had been available. Hence the return value is not |
48 | * number of really printed characters but size of the input string. Number of really used characters |
48 | * number of really printed characters but size of the input string. Number of really used characters |
49 | * is stored in data->len. |
49 | * is stored in data->len. |
50 | * @param str source string to print |
50 | * @param str source string to print |
51 | * @param count size of source string |
51 | * @param count size of source string |
52 | * @param data structure with destination string, counter of used space and total string size. |
52 | * @param data structure with destination string, counter of used space and total string size. |
53 | * @return number of characters to print (not characters really printed!) |
53 | * @return number of characters to print (not characters really printed!) |
54 | */ |
54 | */ |
55 | static int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data) |
55 | static int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data) |
56 | { |
56 | { |
57 | size_t i; |
57 | size_t i; |
58 | i = data->size - data->len; |
58 | i = data->size - data->len; |
59 | 59 | ||
60 | if (i == 0) { |
60 | if (i == 0) { |
61 | return count; |
61 | return count; |
62 | } |
62 | } |
63 | 63 | ||
64 | if (i == 1) { |
64 | if (i == 1) { |
65 | /* We have only one free byte left in buffer => write there trailing zero */ |
65 | /* We have only one free byte left in buffer => write there trailing zero */ |
66 | data->string[data->size - 1] = 0; |
66 | data->string[data->size - 1] = 0; |
67 | data->len = data->size; |
67 | data->len = data->size; |
68 | return count; |
68 | return count; |
69 | } |
69 | } |
70 | 70 | ||
71 | if (i <= count) { |
71 | if (i <= count) { |
72 | /* We have not enought space for whole string with the trailing zero => print only a part of string */ |
72 | /* We have not enought space for whole string with the trailing zero => print only a part of string */ |
73 | memcpy((void *)(data->string + data->len), (void *)str, i - 1); |
73 | memcpy((void *)(data->string + data->len), (void *)str, i - 1); |
74 | data->string[data->size - 1] = 0; |
74 | data->string[data->size - 1] = 0; |
75 | data->len = data->size; |
75 | data->len = data->size; |
76 | return count; |
76 | return count; |
77 | } |
77 | } |
78 | 78 | ||
79 | /* Buffer is big enought to print whole string */ |
79 | /* Buffer is big enought to print whole string */ |
80 | memcpy((void *)(data->string + data->len), (void *)str, count); |
80 | memcpy((void *)(data->string + data->len), (void *)str, count); |
81 | data->len += count; |
81 | data->len += count; |
82 | /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */ |
82 | /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */ |
83 | data->string[data->len] = 0; |
83 | data->string[data->len] = 0; |
84 | 84 | ||
85 | return count; |
85 | return count; |
86 | } |
86 | } |
87 | 87 | ||
88 | int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) |
88 | int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) |
89 | { |
89 | { |
90 | struct vsnprintf_data data = {size, 0, str}; |
90 | struct vsnprintf_data data = {size, 0, str}; |
91 | struct printf_spec ps = {(int(*)(void *, size_t, void *))vsnprintf_write, &data}; |
91 | struct printf_spec ps = {(int(*)(void *, size_t, void *))vsnprintf_write, &data}; |
92 | 92 | ||
93 | /* Print 0 at end of string - fix the case that nothing will be printed */ |
93 | /* Print 0 at end of string - fix the case that nothing will be printed */ |
94 | if (size > 0) |
94 | if (size > 0) |
95 | str[0] = 0; |
95 | str[0] = 0; |
96 | 96 | ||
97 | /* vsnprintf_write ensures that str will be terminated by zero. */ |
97 | /* vsnprintf_write ensures that str will be terminated by zero. */ |
98 | return printf_core(fmt, &ps, ap); |
98 | return printf_core(fmt, &ps, ap); |
99 | } |
99 | } |
100 | 100 | ||
101 | /** @} |
101 | /** @} |
102 | */ |
102 | */ |
103 | 103 |