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><H1
><A
NAME="PAD-STRING"
></A
>pad-string</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN433"
></A
><H2
>Name</H2
>pad-string -- Pads a string, in front, to the specified length</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN436"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>(pad-string string length padchar)</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN439"
></A
><H2
>Description</H2
><P
>Returns <TT
CLASS="LITERAL"
>string</TT
>, padded in front with <TT
CLASS="LITERAL"
>padchar</TT
> to at least <TT
CLASS="LITERAL"
>length</TT
>
Returns <TT
CLASS="LITERAL"
>string</TT
> unmodified if <TT
CLASS="LITERAL"
>string</TT
> is not a <TT
CLASS="LITERAL"
>(string?)</TT
>,
<TT
CLASS="LITERAL"
>padchar</TT
> is not a <TT
CLASS="LITERAL"
>(string?)</TT
>, <TT
CLASS="LITERAL"
>padchar</TT
> is the empty string, or if
<TT
CLASS="LITERAL"
>string</TT
> is already greater than or equal to <TT
CLASS="LITERAL"
>length</TT
> in length.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>string</TT
></DT
><DD
><P
>The string to pad.</P
></DD
><DT
><TT
CLASS="LITERAL"
>length</TT
></DT
><DD
><P
>The desired length.</P
></DD
><DT
><TT
CLASS="LITERAL"
>padchar</TT
></DT
><DD
><P
>The character (string, actually) to use as padding. If <TT
CLASS="LITERAL"
>padchar</TT
> is
longer than 1 character, the resulting string may be longer than
<TT
CLASS="LITERAL"
>length</TT
> when returned.</P
></DD
></DL
></DIV
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><DIV
CLASS="REFSECT1"
><A
NAME="AEN471"
></A
><H2
>Author</H2
><P
>Norman Walsh, <ndw@nwalsh.com></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN474"
></A
><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (pad-string string length padchar)
;; Pads a string, in front, to the specified length
(if (and (string? string)
(string? padchar)
(> (string-length padchar) 0))
(let loop ((s string) (count (- length (string-length string))))
(if (<= count 0)
s
(loop (string-append padchar s)
(- count (string-length padchar)))))
string))</PRE
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