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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
d5a89d7d KS |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Kay Sievers | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | /* | |
22 | * Concatenates/copies strings. In any case, terminates in all cases | |
9e5bd85a VC |
23 | * with '\0' and moves the @dest pointer forward to the added '\0'. |
24 | * Returns the remaining size, and 0 if the string was truncated. | |
25 | * | |
26 | * Due to the intended usage, these helpers silently noop invocations | |
27 | * having zero size. This is technically an exception to the above | |
28 | * statement "terminates in all cases". It's unexpected for such calls to | |
29 | * occur outside of a loop where this is the preferred behavior. | |
d5a89d7d KS |
30 | */ |
31 | ||
11c3a366 | 32 | #include <stdarg.h> |
d5a89d7d KS |
33 | #include <stdio.h> |
34 | #include <string.h> | |
cf0fbc49 | 35 | |
d5a89d7d KS |
36 | #include "strxcpyx.h" |
37 | ||
f168c273 | 38 | size_t strpcpy(char **dest, size_t size, const char *src) { |
d5a89d7d KS |
39 | size_t len; |
40 | ||
f91049d5 VC |
41 | assert(dest); |
42 | assert(src); | |
43 | ||
9e5bd85a VC |
44 | if (size == 0) |
45 | return 0; | |
46 | ||
d5a89d7d KS |
47 | len = strlen(src); |
48 | if (len >= size) { | |
49 | if (size > 1) | |
50 | *dest = mempcpy(*dest, src, size-1); | |
51 | size = 0; | |
52 | } else { | |
53 | if (len > 0) { | |
54 | *dest = mempcpy(*dest, src, len); | |
55 | size -= len; | |
56 | } | |
57 | } | |
58 | *dest[0] = '\0'; | |
59 | return size; | |
60 | } | |
61 | ||
f168c273 | 62 | size_t strpcpyf(char **dest, size_t size, const char *src, ...) { |
d5a89d7d KS |
63 | va_list va; |
64 | int i; | |
65 | ||
f91049d5 VC |
66 | assert(dest); |
67 | assert(src); | |
68 | ||
9e5bd85a VC |
69 | if (size == 0) |
70 | return 0; | |
71 | ||
d5a89d7d KS |
72 | va_start(va, src); |
73 | i = vsnprintf(*dest, size, src, va); | |
74 | if (i < (int)size) { | |
75 | *dest += i; | |
76 | size -= i; | |
77 | } else { | |
d5a89d7d KS |
78 | size = 0; |
79 | } | |
80 | va_end(va); | |
d5a89d7d KS |
81 | return size; |
82 | } | |
83 | ||
f168c273 | 84 | size_t strpcpyl(char **dest, size_t size, const char *src, ...) { |
d5a89d7d KS |
85 | va_list va; |
86 | ||
f91049d5 VC |
87 | assert(dest); |
88 | assert(src); | |
89 | ||
d5a89d7d KS |
90 | va_start(va, src); |
91 | do { | |
92 | size = strpcpy(dest, size, src); | |
93 | src = va_arg(va, char *); | |
94 | } while (src != NULL); | |
95 | va_end(va); | |
96 | return size; | |
97 | } | |
98 | ||
f168c273 | 99 | size_t strscpy(char *dest, size_t size, const char *src) { |
d5a89d7d KS |
100 | char *s; |
101 | ||
f91049d5 VC |
102 | assert(dest); |
103 | assert(src); | |
104 | ||
d5a89d7d KS |
105 | s = dest; |
106 | return strpcpy(&s, size, src); | |
107 | } | |
108 | ||
109 | size_t strscpyl(char *dest, size_t size, const char *src, ...) { | |
110 | va_list va; | |
111 | char *s; | |
112 | ||
f91049d5 VC |
113 | assert(dest); |
114 | assert(src); | |
115 | ||
d5a89d7d KS |
116 | va_start(va, src); |
117 | s = dest; | |
118 | do { | |
119 | size = strpcpy(&s, size, src); | |
120 | src = va_arg(va, char *); | |
121 | } while (src != NULL); | |
122 | va_end(va); | |
123 | ||
124 | return size; | |
125 | } |