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Adds isdigit() and isletter() to string.bas #917

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Adds isdigit() and isletter() to string.bas #917

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35 changes: 35 additions & 0 deletions src/lib/arch/zx48k/stdlib/string.bas
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Original file line number Diff line number Diff line change
Expand Up @@ -305,6 +305,41 @@ function trim(ByVal s$ as String, ByVal rep$ as String) as String
return ltrim(rtrim(s$, rep$), rep$)
end function


' ----------------------------------------------------------------
' function isdigit(ByVal s$)
'
' Returns not 0 if the first element of s$ is a digit,
' or 0 otherwise.
' For example:
' isdigit("a") returns 0, isdigit("2") returns 1
' ----------------------------------------------------------------
function isdigit(ByVal s$ as String) as ubyte
dim asc_key as ubyte = code( s$( 0 ) )

return asc_key >= code( "0" ) _
and asc_key <= code( "9" )
end function


' ----------------------------------------------------------------
' function isletter(ByVal s$)
'
' Returns not 0 if the first element of s$ is a letter,
' or 0 otherwise.
' For example:
' isletter("0") returns 0, isletter("a") returns 1
' ----------------------------------------------------------------
function isletter(ByVal s$ as String) as ubyte
dim asc_key as ubyte = code( s$( 0 ) )

return ( asc_key >= code( "a" ) _
and asc_key <= code( "z" ) ) _
or ( asc_key >= code( "A" ) _
and asc_key <= code( "Z" ) )
end function


#undef __MAX_LEN__

#pragma pop(string_base)
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24 changes: 24 additions & 0 deletions tests/functional/arch/zx48k/string_isdigit_isletter.bas
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
#include <string.bas>


sub show_isdigit_letter_for(byval s as string)
print bright 1; "str: "; inverse 1; s + chr$( 13 )
print bright 1; "dig: ";
for i = 0 to len( s ) - 1
print( isdigit( s( i ) ) );
next
print( chr( 13 ) )
print bright 1; "ltr: ";
for i = 0 to len( s ) - 1
print( isletter( s( i ) ) );
next
print( chr( 13 ) )
end sub


dim a as string = "abc0123456789cba.-,[]()/=?:"
dim b as string = "0123abc456abc789.-,[]()/=?:"

cls
show_isdigit_letter_for( a )
show_isdigit_letter_for( b )