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