.TH qlibs byte 3
.SH NAME
byte \- byte manipulation/evaluation 
.SH SYNTAX
.B #include \(dqbyte.h\(dq

unsigned int \fBbyte_chr\fP(const char *\fIhaystack\fR,unsigned int \fIlen\fR,char \fIneedle\fR);
.br
unsigned int \fBbyte_rchr\fP(const char *\fIhaystack\fR,unsigned int \fIlen\fR,char \fIneedle\fR);

void \fBbyte_copy\fP(char *\fIout\fR,unsigned int \fIlen\fR,const char *\fIin\fR);
.br
void \fBbyte_copyr\fP(char *\fIout\fR,unsigned int \fIlen\fR,const char *\fIin\fR);

int \fBbyte_diff\fP(const char *\fIone\fR,unsigned int \fIlen\fR,const char *\fItwo\fR);

int \fBbyte_equal\fP(const char *\fIone\fR,unsigned int \fIlen\fR,const char *\fItwo\fR);

void \fBbyte_fill\fP(char *\fIout\fR,unsigned int \fIlen\fR,const char \fIc\fR);
.br
void \fBbyte_zero\fP(char *\fIout\fR,unsigned int \fIlen\fR);
.SH DESCRIPTION
.B byte_chr 
returns the smallest integer \fIi\fR between 0 and
\fIlen\fR-1 inclusive such that \fIone\fR[\fIi\fR] equals \fIneedle\fR.
If no such integer exists, 
.B byte_chr 
returns \fIlen\fR.
.B byte_chr 
may read all bytes \fIone\fR[0], \fIone\fR[1], ...,
\fIone\fR[\fIlen\fR-1], even if not all the bytes are relevant to the
answer.

.B byte_rchr 
returns the largest integer \fIi\fR between 0 and
\fIlen\fR-1 inclusive such that \fIone\fR[\fIi\fR] equals \fIneedle\fR.
If no such integer exists, 
.B byte_rchr 
returns \fIlen\fR.
.B byte_rchr 
may read all bytes \fIone\fR[0], \fIone\fR[1], ...,
\fIone\fR[\fIlen\fR-1], even if not all the bytes are relevant to the
answer.

.B byte_copy 
copies \fIin\fR[0] to \fIout\fR[0], \fIin\fR[1] to
\fIout\fR[1], etc., and finally \fIin\fR[\fIlen\fR-1] to
\fIout\fR[\fIlen\fR-1].

.B byte_copyr 
copies \fIin\fR[\fIlen\fR-1] to \fIout\fR[\fIlen\fR-1], 
\fIin\fR[\fIlen\fR-2] to \fIout\fR[\fIlen\fR-2], etc., and
\fIin\fR[0] to \fIout\fR[0].

.B byte_diff 
returns negative, 0, or positive, depending on whether
the string \fIone\fR[0], \fIone\fR[1], ..., \fIone\fR[\fIlen\fR-1] is
lexicographically smaller than, equal to, or greater than the string
\fIone\fR[0], \fIone\fR[1], ..., \fIone\fR[\fIlen\fR-1].
When the strings are different, 
.B byte_diff 
does not read bytes past the first difference.

.B byte_equal
returns 
.I 1 
if the strings are equal, 
.I 0
otherwise.
When the strings are different, 
.B byte_equal 
does not read bytes past the first difference.

.B byte_fill
fills \fIout\fR[0], \fIout\fR[1], ..., \fIout\fR[\fIlen\fR-1] 
with a single byte \fIc\fR.

.B byte_zero 
sets \fIout\fR[0], \fIout\fR[1], ..., \fIout\fR[\fIlen\fR-1] to 0.
.SH "SEE ALSO"
case(3), 
stralloc(3)