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