You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
27 lines
896 B
Groff
27 lines
896 B
Groff
4 years ago
|
.TH fmt_copybytes_sizeof_minus1 3
|
||
|
|
.SH NAME
|
||
|
|
fmt_copybytes_sizeof_minus1 \- write binary data
|
||
|
|
.SH SYNTAX
|
||
|
|
.B #include <libowfat/fmt.h>
|
||
|
|
|
||
|
|
size_t \fBfmt_copybytes_sizeof_minus1\fP(char *\fIdest\fR,const char *\fIsource\fR);
|
||
|
|
.SH DESCRIPTION
|
||
|
|
This macro will copy sizeof(\fIsource\fP)-1 bytes from \fIsource\fP to \fIdest\fP.
|
||
|
|
|
||
|
|
This is a convenience wrapper interface around
|
||
|
|
\fIfmt_copybytes\fP for the situation where you construct a binary
|
||
|
|
message by concatenating hex constant strings like this:
|
||
|
|
|
||
|
|
fmt_copybytes_sizeof_minus1(dest, "\\x01\\x02\\x03\\x04");
|
||
|
|
|
||
|
|
Since the source is technically a string, the compiler will add a 0 byte
|
||
|
|
and sizeof() will return the size including that 0 byte. That is why we
|
||
|
|
have a minus 1 in this function, so we do not copy or count that 0 byte.
|
||
|
|
|
||
|
|
.SH NOTE
|
||
|
|
Caution: \fIsource\fP must not have side effects or those will be
|
||
|
|
evaluated twice.
|
||
|
|
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
fmt_copybytes(3)
|