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26 lines
896 B
26 lines
896 B
.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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