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The is_num(), is_alpha(), and is_alnum() BiFs now return F on empty string

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This commit is contained in:
Christian Kreibich 2022-02-28 13:02:36 -08:00
parent 19bfa071e0
commit b977e76ad5
2 changed files with 17 additions and 3 deletions
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2
NEWS
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@ -15,6 +15,8 @@ New Functionality
Changed Functionality
---------------------
- The is_num(), is_alpha(), and is_alnum() BiFs now return F for the empty string.
Deprecated Functionality
------------------------

18
src/strings.bif
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@ -1254,13 +1254,17 @@ function ends_with%(str: string, sub: string%) : bool
return zeek::val_mgr->Bool(s.rfind(sub_s) == (s.size() - sub_s.size()));
%}
## Returns whether an entire string consists only of digits.
## Returns whether a string consists entirely of digits.
## The empty string is not numeric.
##
function is_num%(str: string%) : bool
%{
// Python's version of this method (which this is based on) just checks to see if every
// character in the string is a numeric value. If something more than this is desired, we
// could use something like std::from_chars or std::strto{ul,f} to check it.
if ( str->Len() == 0 )
return zeek::val_mgr->False();
const char* s = str->CheckString();
for ( int i = 0; i < str->Len(); i++ )
if ( ! std::isdigit(s[i]) )
@ -1269,10 +1273,14 @@ function is_num%(str: string%) : bool
return zeek::val_mgr->True();
%}
## Returns whether an entire string is alphabetic characters.
## Returns whether a string consists entirely of alphabetic characters.
## The empty string is not alphabetic.
##
function is_alpha%(str: string%) : bool
%{
if ( str->Len() == 0 )
return zeek::val_mgr->False();
const char* s = str->CheckString();
for ( int i = 0; i < str->Len(); i++ )
if ( ! std::isalpha(s[i]) )
@ -1281,10 +1289,14 @@ function is_alpha%(str: string%) : bool
return zeek::val_mgr->True();
%}
## Returns whether an entire string is alphanumeric characters
## Returns whether a string consists entirely of alphanumeric characters.
## The empty string is not alphanumeric.
##
function is_alnum%(str: string%) : bool
%{
if ( str->Len() == 0 )
return zeek::val_mgr->False();
const char* s = str->CheckString();
for ( int i = 0; i < str->Len(); i++ )
if ( ! std::isalnum(s[i]) )