aboutsummaryrefslogtreecommitdiffstats
path: root/man3/libsimple_memdup.3
blob: 78c6e0bcc75deb9c3acc075f31c229cc47cb4185 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
.TH LIBSIMPLE_MEMDUP 3 libsimple
.SH NAME
libsimple_memdup \- duplicate bytes in memory

.SH SYNOPSIS
.nf
#include <libsimple.h>

void *libsimple_memdupa(const void *\fIs\fP, size_t \fIn\fP);
void *libsimple_memdup(const void *\fIs\fP, size_t \fIn\fP);
void *libsimple_enmemdup(int \fIstatus\fP, const void *\fIs\fP, size_t \fIn\fP);
inline void *libsimple_ememdup(const void *\fIs\fP, size_t \fIn\fP);

#ifndef memdupa
# define memdupa libsimple_memdupa
#endif
#ifndef memdup
# define memdup libsimple_memdup
#endif
#ifndef enmemdup
# define enmemdup libsimple_enmemdup
#endif
#ifndef ememdup
# define ememdup libsimple_ememdup
#endif
.fi
.PP
Link with
.IR \-lsimple .

.SH DESCRIPTION
The
.BR libsimple_memdup ()
function allocates memory and copies
.I n
first bytes from
.I s
into the new allocation.
.PP
The
.BR libsimple_enmemdup ()
and
.BR libsimple_ememdup ()
functions are versions of the
.BR libsimple_memdup ()
function that call the
.BR libsimple_enprintf (3)
function on failure, causing the process to print
an error message and exit. See
.BR libsimple_enprintf (3)
for more information.
.PP
The
.BR libsimple_memdupa ()
function is implemented as a macro and is a version
of the
.BR libsimple_memdup ()
function that uses allocates the memory on the stack
rather than on the heap, causing the return pointer
to become invalid when the calling function returns.
It is only available when compling with GCC or Clang.

.SH RETURN VALUE
Upon successful completion, the
.BR libsimple_memdupa (),
.BR libsimple_memdup (),
.BR libsimple_enmemdup (),
and
.BR libsimple_ememdup ()
functions return a non-null pointer, on failure the
.BR libsimple_memdup ()
function returns
.B NULL
and set
.I errno
to indicate the error, and the
.BR libsimple_enmemdup (),
and
.BR libsimple_ememdup ()
functions exit the process. The
.BR libsimple_memdupa ()
function cannot fail, however the kernel
can kill the thread, and possibly the process, with a
.B SIGSEGV
signal if the memory cannot be allocated.
.PP
The returned pointer should be deallocated when it
is no longer needed, except for the pointer returned
by the
.BR libsimple_memdupa ()
function, it is automatically deallocated when the
calling function returns.

.SH ERRORS
The
.BR libsimple_memdup ()
function may fail for any reason specified for the
.BR malloc (3)
function.

.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lb
l l l.
Interface	Attribute	Value
T{
.BR libsimple_memdupa (),
.br
.BR libsimple_memdup (),
.br
.BR libsimple_enmemdup (),
.br
.BR libsimple_ememdup (),
T}	Thread safety	MT-Safe
T{
.BR libsimple_memdupa (),
.br
.BR libsimple_memdup (),
.br
.BR libsimple_enmemdup (),
.br
.BR libsimple_ememdup (),
T}	Async-signal safety	AS-Safe
T{
.BR libsimple_memdupa (),
.br
.BR libsimple_memdup (),
.br
.BR libsimple_enmemdup (),
.br
.BR libsimple_ememdup (),
T}	Async-cancel safety	AC-Safe
.TE

.SH EXAMPLES
None.

.SH APPLICATION USAGE
None.

.SH RATIONALE
None.

.SH FUTURE DIRECTIONS
None.

.SH NOTES
None.

.SH HISTORY
libsimple 1.0

.SH BUGS
None.

.SH SEE ALSO
.BR libsimple_aligned_memdup (3),
.BR libsimple_enstrndup (3),
.BR libsimple_enstrdup (3),
.BR libsimple_enwcsdup (3),
.BR libsimple_wcsndup (3),
.BR libsimple_wmemdup (3),
.BR strndup (3),
.BR strdup (3),
.BR wcsdup (3)