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