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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
d5a89d7d | 2 | /*** |
96b2fb93 | 3 | Copyright © 2013 Kay Sievers |
d5a89d7d KS |
4 | ***/ |
5 | ||
6 | /* | |
7 | * Concatenates/copies strings. In any case, terminates in all cases | |
9e5bd85a VC |
8 | * with '\0' and moves the @dest pointer forward to the added '\0'. |
9 | * Returns the remaining size, and 0 if the string was truncated. | |
10 | * | |
11 | * Due to the intended usage, these helpers silently noop invocations | |
12 | * having zero size. This is technically an exception to the above | |
13 | * statement "terminates in all cases". It's unexpected for such calls to | |
14 | * occur outside of a loop where this is the preferred behavior. | |
d5a89d7d KS |
15 | */ |
16 | ||
11c3a366 | 17 | #include <stdarg.h> |
d5a89d7d KS |
18 | #include <stdio.h> |
19 | #include <string.h> | |
cf0fbc49 | 20 | |
d5a89d7d KS |
21 | #include "strxcpyx.h" |
22 | ||
f168c273 | 23 | size_t strpcpy(char **dest, size_t size, const char *src) { |
d5a89d7d KS |
24 | size_t len; |
25 | ||
f91049d5 VC |
26 | assert(dest); |
27 | assert(src); | |
28 | ||
9e5bd85a VC |
29 | if (size == 0) |
30 | return 0; | |
31 | ||
d5a89d7d KS |
32 | len = strlen(src); |
33 | if (len >= size) { | |
34 | if (size > 1) | |
35 | *dest = mempcpy(*dest, src, size-1); | |
36 | size = 0; | |
37 | } else { | |
38 | if (len > 0) { | |
39 | *dest = mempcpy(*dest, src, len); | |
40 | size -= len; | |
41 | } | |
42 | } | |
43 | *dest[0] = '\0'; | |
44 | return size; | |
45 | } | |
46 | ||
f168c273 | 47 | size_t strpcpyf(char **dest, size_t size, const char *src, ...) { |
d5a89d7d KS |
48 | va_list va; |
49 | int i; | |
50 | ||
f91049d5 VC |
51 | assert(dest); |
52 | assert(src); | |
53 | ||
9e5bd85a VC |
54 | if (size == 0) |
55 | return 0; | |
56 | ||
d5a89d7d KS |
57 | va_start(va, src); |
58 | i = vsnprintf(*dest, size, src, va); | |
59 | if (i < (int)size) { | |
60 | *dest += i; | |
61 | size -= i; | |
62 | } else { | |
d5a89d7d KS |
63 | size = 0; |
64 | } | |
65 | va_end(va); | |
d5a89d7d KS |
66 | return size; |
67 | } | |
68 | ||
f168c273 | 69 | size_t strpcpyl(char **dest, size_t size, const char *src, ...) { |
d5a89d7d KS |
70 | va_list va; |
71 | ||
f91049d5 VC |
72 | assert(dest); |
73 | assert(src); | |
74 | ||
d5a89d7d KS |
75 | va_start(va, src); |
76 | do { | |
77 | size = strpcpy(dest, size, src); | |
78 | src = va_arg(va, char *); | |
79 | } while (src != NULL); | |
80 | va_end(va); | |
81 | return size; | |
82 | } | |
83 | ||
f168c273 | 84 | size_t strscpy(char *dest, size_t size, const char *src) { |
d5a89d7d KS |
85 | char *s; |
86 | ||
f91049d5 VC |
87 | assert(dest); |
88 | assert(src); | |
89 | ||
d5a89d7d KS |
90 | s = dest; |
91 | return strpcpy(&s, size, src); | |
92 | } | |
93 | ||
94 | size_t strscpyl(char *dest, size_t size, const char *src, ...) { | |
95 | va_list va; | |
96 | char *s; | |
97 | ||
f91049d5 VC |
98 | assert(dest); |
99 | assert(src); | |
100 | ||
d5a89d7d KS |
101 | va_start(va, src); |
102 | s = dest; | |
103 | do { | |
104 | size = strpcpy(&s, size, src); | |
105 | src = va_arg(va, char *); | |
106 | } while (src != NULL); | |
107 | va_end(va); | |
108 | ||
109 | return size; | |
110 | } |