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-rw-r--r--lib/stdlib/doc/src/io.xml8
-rw-r--r--lib/stdlib/src/io_lib_format.erl42
-rw-r--r--lib/stdlib/test/io_SUITE.erl84
3 files changed, 109 insertions, 25 deletions
diff --git a/lib/stdlib/doc/src/io.xml b/lib/stdlib/doc/src/io.xml
index efbb1fc078..81fb5cad3d 100644
--- a/lib/stdlib/doc/src/io.xml
+++ b/lib/stdlib/doc/src/io.xml
@@ -464,9 +464,9 @@ ok</pre>
<p>Prints the argument with the <c>string</c> syntax. The
argument is, if no Unicode translation modifier is present, an
<seealso marker="erts:erlang#iolist_definition">I/O list</seealso>, a binary, or an atom. If the Unicode translation modifier ('t') is in effect, the argument is chardata(), meaning that binaries are in UTF-8. The characters
- are printed without quotes. In this format, the printed
- argument is truncated to the given precision and field
- width.</p>
+ are printed without quotes. The string is first truncated
+ by the given precision and then padded and justified
+ to the given field width. The default precision is the field width.</p>
<p>This format can be used for printing any object and
truncating the output so it fits a specified field:</p>
<pre>
@@ -475,6 +475,8 @@ ok</pre>
ok
4> <input>io:fwrite("|~10s|~n", [io_lib:write({hey, hey, hey})]).</input>
|{hey,hey,h|
+5> <input>io:fwrite("|~-10.8s|~n", [io_lib:write({hey, hey, hey})]).</input>
+|{hey,hey |
ok</pre>
<p>A list with integers larger than 255 is considered an error if the Unicode translation modifier is not given:</p>
<pre>
diff --git a/lib/stdlib/src/io_lib_format.erl b/lib/stdlib/src/io_lib_format.erl
index 7c04d78ce8..49a00a4ec7 100644
--- a/lib/stdlib/src/io_lib_format.erl
+++ b/lib/stdlib/src/io_lib_format.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2009. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -558,26 +558,30 @@ iolist_to_chars(B) when is_binary(B) ->
string(S, none, _Adj, none, _Pad) -> S;
string(S, F, Adj, none, Pad) ->
- N = lists:flatlength(S),
- if N > F -> flat_trunc(S, F);
- N =:= F -> S;
- true -> adjust(S, chars(Pad, F-N), Adj)
- end;
+ string_field(S, F, Adj, lists:flatlength(S), Pad);
string(S, none, _Adj, P, Pad) ->
+ string_field(S, P, left, lists:flatlength(S), Pad);
+string(S, F, Adj, P, Pad) when F >= P ->
N = lists:flatlength(S),
- if N > P -> flat_trunc(S, P);
- N =:= P -> S;
- true -> [S|chars(Pad, P-N)]
- end;
-string(S, F, Adj, F, Pad) ->
- string(S, none, Adj, F, Pad);
-string(S, F, Adj, P, Pad) when F > P ->
- N = lists:flatlength(S),
- if N > P -> adjust(flat_trunc(S, P), chars(Pad, F-P), Adj);
- N =:= P -> adjust(S, chars(Pad, F-P), Adj);
- true -> adjust([S|chars(Pad, P-N)], chars(Pad, F-P), Adj)
+ if F > P ->
+ if N > P ->
+ adjust(flat_trunc(S, P), chars(Pad, F-P), Adj);
+ N < P ->
+ adjust([S|chars(Pad, P-N)], chars(Pad, F-P), Adj);
+ true -> % N == P
+ adjust(S, chars(Pad, F-P), Adj)
+ end;
+ true -> % F == P
+ string_field(S, F, Adj, N, Pad)
end.
+string_field(S, F, _Adj, N, _Pad) when N > F ->
+ flat_trunc(S, F);
+string_field(S, F, Adj, N, Pad) when N < F ->
+ adjust(S, chars(Pad, F-N), Adj);
+string_field(S, _, _, _, _) -> % N == F
+ S.
+
%% unprefixed_integer(Int, Field, Adjust, Base, PadChar, Lowercase)
%% -> [Char].
@@ -622,8 +626,8 @@ newline(F, right, _P, _Pad) -> chars($\n, F).
%%
adjust(Data, [], _) -> Data;
-adjust(Data, Pad, left) -> [Data,Pad];
-adjust(Data, Pad, right) -> [Pad,Data].
+adjust(Data, Pad, left) -> [Data|Pad];
+adjust(Data, Pad, right) -> [Pad|Data].
%% Flatten and truncate a deep list to at most N elements.
diff --git a/lib/stdlib/test/io_SUITE.erl b/lib/stdlib/test/io_SUITE.erl
index 497fd3c562..54a98985cd 100644
--- a/lib/stdlib/test/io_SUITE.erl
+++ b/lib/stdlib/test/io_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1999-2010. All Rights Reserved.
+%% Copyright Ericsson AB 1999-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -27,7 +27,7 @@
otp_6282/1, otp_6354/1, otp_6495/1, otp_6517/1, otp_6502/1,
manpage/1, otp_6708/1, otp_7084/1, otp_7421/1,
io_lib_collect_line_3_wb/1, cr_whitespace_in_string/1,
- io_fread_newlines/1]).
+ io_fread_newlines/1, otp_8989/1]).
%-define(debug, true).
@@ -62,7 +62,7 @@ all() ->
otp_6282, otp_6354, otp_6495, otp_6517, otp_6502,
manpage, otp_6708, otp_7084, otp_7421,
io_lib_collect_line_3_wb, cr_whitespace_in_string,
- io_fread_newlines].
+ io_fread_newlines, otp_8989].
groups() ->
[].
@@ -1917,3 +1917,81 @@ read_newlines(Fd, Acc, N0) ->
eof ->
{lists:reverse(Acc),N0}
end.
+
+
+
+otp_8989(doc) ->
+ "OTP-8989 io:format for ~F.Ps ignores P in some cases";
+otp_8989(Suite) when is_list(Suite) ->
+ Hello = "Hello",
+ ?line " Hello" = fmt("~6.6s", [Hello]),
+ ?line " Hello" = fmt("~*.6s", [6,Hello]),
+ ?line " Hello" = fmt("~6.*s", [6,Hello]),
+ ?line " Hello" = fmt("~*.*s", [6,6,Hello]),
+ %%
+ ?line " Hello" = fmt("~6.5s", [Hello]),
+ ?line " Hello" = fmt("~*.5s", [6,Hello]),
+ ?line " Hello" = fmt("~6.*s", [5,Hello]),
+ ?line " Hello" = fmt("~*.*s", [6,5,Hello]),
+ %%
+ ?line " Hell" = fmt("~6.4s", [Hello]),
+ ?line " Hell" = fmt("~*.4s", [6,Hello]),
+ ?line " Hell" = fmt("~6.*s", [4,Hello]),
+ ?line " Hell" = fmt("~*.*s", [6,4,Hello]),
+ %%
+ ?line "Hello" = fmt("~5.5s", [Hello]),
+ ?line "Hello" = fmt("~*.5s", [5,Hello]),
+ ?line "Hello" = fmt("~5.*s", [5,Hello]),
+ ?line "Hello" = fmt("~*.*s", [5,5,Hello]),
+ %%
+ ?line " Hell" = fmt("~5.4s", [Hello]),
+ ?line " Hell" = fmt("~*.4s", [5,Hello]),
+ ?line " Hell" = fmt("~5.*s", [4,Hello]),
+ ?line " Hell" = fmt("~*.*s", [5,4,Hello]),
+ %%
+ ?line "Hell" = fmt("~4.4s", [Hello]),
+ ?line "Hell" = fmt("~*.4s", [4,Hello]),
+ ?line "Hell" = fmt("~4.*s", [4,Hello]),
+ ?line "Hell" = fmt("~*.*s", [4,4,Hello]),
+ %%
+ ?line " Hel" = fmt("~4.3s", [Hello]),
+ ?line " Hel" = fmt("~*.3s", [4,Hello]),
+ ?line " Hel" = fmt("~4.*s", [3,Hello]),
+ ?line " Hel" = fmt("~*.*s", [4,3,Hello]),
+ %%
+ %%
+ ?line "Hello " = fmt("~-6.6s", [Hello]),
+ ?line "Hello " = fmt("~*.6s", [-6,Hello]),
+ ?line "Hello " = fmt("~-6.*s", [6,Hello]),
+ ?line "Hello " = fmt("~*.*s", [-6,6,Hello]),
+ %%
+ ?line "Hello " = fmt("~-6.5s", [Hello]),
+ ?line "Hello " = fmt("~*.5s", [-6,Hello]),
+ ?line "Hello " = fmt("~-6.*s", [5,Hello]),
+ ?line "Hello " = fmt("~*.*s", [-6,5,Hello]),
+ %%
+ ?line "Hell " = fmt("~-6.4s", [Hello]),
+ ?line "Hell " = fmt("~*.4s", [-6,Hello]),
+ ?line "Hell " = fmt("~-6.*s", [4,Hello]),
+ ?line "Hell " = fmt("~*.*s", [-6,4,Hello]),
+ %%
+ ?line "Hello" = fmt("~-5.5s", [Hello]),
+ ?line "Hello" = fmt("~*.5s", [-5,Hello]),
+ ?line "Hello" = fmt("~-5.*s", [5,Hello]),
+ ?line "Hello" = fmt("~*.*s", [-5,5,Hello]),
+ %%
+ ?line "Hell " = fmt("~-5.4s", [Hello]),
+ ?line "Hell " = fmt("~*.4s", [-5,Hello]),
+ ?line "Hell " = fmt("~-5.*s", [4,Hello]),
+ ?line "Hell " = fmt("~*.*s", [-5,4,Hello]),
+ %%
+ ?line "Hell" = fmt("~-4.4s", [Hello]),
+ ?line "Hell" = fmt("~*.4s", [-4,Hello]),
+ ?line "Hell" = fmt("~-4.*s", [4,Hello]),
+ ?line "Hell" = fmt("~*.*s", [-4,4,Hello]),
+ %%
+ ?line "Hel " = fmt("~-4.3s", [Hello]),
+ ?line "Hel " = fmt("~*.3s", [-4,Hello]),
+ ?line "Hel " = fmt("~-4.*s", [3,Hello]),
+ ?line "Hel " = fmt("~*.*s", [-4,3,Hello]),
+ ok.
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-16 00:41:37 +0000