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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
d5a89d7d KS |
2 | |
3 | /* | |
4 | * Concatenates/copies strings. In any case, terminates in all cases | |
9e5bd85a VC |
5 | * with '\0' and moves the @dest pointer forward to the added '\0'. |
6 | * Returns the remaining size, and 0 if the string was truncated. | |
7 | * | |
8 | * Due to the intended usage, these helpers silently noop invocations | |
9 | * having zero size. This is technically an exception to the above | |
10 | * statement "terminates in all cases". It's unexpected for such calls to | |
11 | * occur outside of a loop where this is the preferred behavior. | |
d5a89d7d KS |
12 | */ |
13 | ||
11c3a366 | 14 | #include <stdarg.h> |
d5a89d7d KS |
15 | #include <stdio.h> |
16 | #include <string.h> | |
cf0fbc49 | 17 | |
d5a89d7d KS |
18 | #include "strxcpyx.h" |
19 | ||
f168c273 | 20 | size_t strpcpy(char **dest, size_t size, const char *src) { |
d5a89d7d KS |
21 | size_t len; |
22 | ||
f91049d5 VC |
23 | assert(dest); |
24 | assert(src); | |
25 | ||
9e5bd85a VC |
26 | if (size == 0) |
27 | return 0; | |
28 | ||
d5a89d7d KS |
29 | len = strlen(src); |
30 | if (len >= size) { | |
31 | if (size > 1) | |
32 | *dest = mempcpy(*dest, src, size-1); | |
33 | size = 0; | |
34 | } else { | |
35 | if (len > 0) { | |
36 | *dest = mempcpy(*dest, src, len); | |
37 | size -= len; | |
38 | } | |
39 | } | |
40 | *dest[0] = '\0'; | |
41 | return size; | |
42 | } | |
43 | ||
f168c273 | 44 | size_t strpcpyf(char **dest, size_t size, const char *src, ...) { |
d5a89d7d KS |
45 | va_list va; |
46 | int i; | |
47 | ||
f91049d5 VC |
48 | assert(dest); |
49 | assert(src); | |
50 | ||
9e5bd85a VC |
51 | if (size == 0) |
52 | return 0; | |
53 | ||
d5a89d7d KS |
54 | va_start(va, src); |
55 | i = vsnprintf(*dest, size, src, va); | |
56 | if (i < (int)size) { | |
57 | *dest += i; | |
58 | size -= i; | |
59 | } else { | |
d5a89d7d KS |
60 | size = 0; |
61 | } | |
62 | va_end(va); | |
d5a89d7d KS |
63 | return size; |
64 | } | |
65 | ||
f168c273 | 66 | size_t strpcpyl(char **dest, size_t size, const char *src, ...) { |
d5a89d7d KS |
67 | va_list va; |
68 | ||
f91049d5 VC |
69 | assert(dest); |
70 | assert(src); | |
71 | ||
d5a89d7d KS |
72 | va_start(va, src); |
73 | do { | |
74 | size = strpcpy(dest, size, src); | |
75 | src = va_arg(va, char *); | |
76 | } while (src != NULL); | |
77 | va_end(va); | |
78 | return size; | |
79 | } | |
80 | ||
f168c273 | 81 | size_t strscpy(char *dest, size_t size, const char *src) { |
d5a89d7d KS |
82 | char *s; |
83 | ||
f91049d5 VC |
84 | assert(dest); |
85 | assert(src); | |
86 | ||
d5a89d7d KS |
87 | s = dest; |
88 | return strpcpy(&s, size, src); | |
89 | } | |
90 | ||
91 | size_t strscpyl(char *dest, size_t size, const char *src, ...) { | |
92 | va_list va; | |
93 | char *s; | |
94 | ||
f91049d5 VC |
95 | assert(dest); |
96 | assert(src); | |
97 | ||
d5a89d7d KS |
98 | va_start(va, src); |
99 | s = dest; | |
100 | do { | |
101 | size = strpcpy(&s, size, src); | |
102 | src = va_arg(va, char *); | |
103 | } while (src != NULL); | |
104 | va_end(va); | |
105 | ||
106 | return size; | |
107 | } |