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-rw-r--r--apt-pkg/contrib/strutl.cc92
-rw-r--r--test/libapt/strutil_test.cc42
2 files changed, 111 insertions, 23 deletions
diff --git a/apt-pkg/contrib/strutl.cc b/apt-pkg/contrib/strutl.cc
index f2fc0b6a6..638f09e9d 100644
--- a/apt-pkg/contrib/strutl.cc
+++ b/apt-pkg/contrib/strutl.cc
@@ -694,34 +694,80 @@ int stringcasecmp(string::const_iterator A,string::const_iterator AEnd,
/*}}}*/
// LookupTag - Lookup the value of a tag in a taged string /*{{{*/
// ---------------------------------------------------------------------
-/* The format is like those used in package files and the method
+/* The format is like those used in package files and the method
communication system */
-string LookupTag(const string &Message,const char *Tag,const char *Default)
+std::string LookupTag(const std::string &Message, const char *TagC, const char *Default)
{
- // Look for a matching tag.
- int Length = strlen(Tag);
- for (string::const_iterator I = Message.begin(); I + Length < Message.end(); ++I)
+ std::string tag = std::string("\n") + TagC + ":";
+ if (Default == nullptr)
+ Default = "";
+ if (Message.length() < tag.length())
+ return Default;
+ std::transform(tag.begin(), tag.end(), tag.begin(), tolower_ascii);
+ auto valuestart = Message.cbegin();
+ // maybe the message starts directly with tag
+ if (Message[tag.length() - 2] == ':')
{
- // Found the tag
- if (I[Length] == ':' && stringcasecmp(I,I+Length,Tag) == 0)
+ std::string lowstart = std::string("\n") + Message.substr(0, tag.length() - 1);
+ std::transform(lowstart.begin(), lowstart.end(), lowstart.begin(), tolower_ascii);
+ if (lowstart == tag)
+ valuestart = std::next(valuestart, tag.length() - 1);
+ }
+ // the tag is somewhere in the message
+ if (valuestart == Message.cbegin())
+ {
+ auto const tagbegin = std::search(Message.cbegin(), Message.cend(), tag.cbegin(), tag.cend(),
+ [](char const a, char const b) { return tolower_ascii(a) == b; });
+ if (tagbegin == Message.cend())
+ return Default;
+ valuestart = std::next(tagbegin, tag.length());
+ }
+ auto const is_whitespace = [](char const c) { return isspace_ascii(c) != 0 && c != '\n'; };
+ auto const is_newline = [](char const c) { return c == '\n'; };
+ std::string result;
+ valuestart = std::find_if_not(valuestart, Message.cend(), is_whitespace);
+ // is the first line of the value empty?
+ if (valuestart != Message.cend() && *valuestart == '\n')
+ {
+ valuestart = std::next(valuestart);
+ if (valuestart != Message.cend() && *valuestart == ' ')
+ valuestart = std::next(valuestart);
+ }
+ // extract the value over multiple lines removing trailing whitespace
+ while (valuestart < Message.cend())
+ {
+ auto const linebreak = std::find_if(valuestart, Message.cend(), is_newline);
+ auto valueend = std::prev(linebreak);
+ // skip spaces at the end of the line
+ while (valueend > valuestart && is_whitespace(*valueend))
+ valueend = std::prev(valueend);
+ // append found line to result
{
- // Find the end of line and strip the leading/trailing spaces
- string::const_iterator J;
- I += Length + 1;
- for (; isspace_ascii(*I) != 0 && I < Message.end(); ++I);
- for (J = I; *J != '\n' && J < Message.end(); ++J);
- for (; J > I && isspace_ascii(J[-1]) != 0; --J);
-
- return string(I,J);
+ std::string tmp(valuestart, std::next(valueend));
+ if (tmp != ".")
+ {
+ if (result.empty())
+ result.assign(std::move(tmp));
+ else
+ result.append(tmp);
+ }
}
-
- for (; *I != '\n' && I < Message.end(); ++I);
- }
-
- // Failed to find a match
- if (Default == 0)
- return string();
- return Default;
+ // see if the value is multiline
+ if (linebreak == Message.cend())
+ break;
+ valuestart = std::next(linebreak);
+ if (valuestart == Message.cend() || *valuestart != ' ')
+ break;
+ result.append("\n");
+ // skip the space leading a multiline (Keep all other whitespaces in the value)
+ valuestart = std::next(valuestart);
+ }
+ auto const valueend = result.find_last_not_of("\n");
+ if (valueend == std::string::npos)
+ result.clear();
+ else
+ result.erase(valueend + 1);
+ return result;
}
/*}}}*/
// StringToBool - Converts a string into a boolean /*{{{*/
diff --git a/test/libapt/strutil_test.cc b/test/libapt/strutil_test.cc
index 9c192a58b..f531c2bf9 100644
--- a/test/libapt/strutil_test.cc
+++ b/test/libapt/strutil_test.cc
@@ -319,3 +319,45 @@ TEST(StrUtilTest,RFC1123StrToTime)
EXPECT_FALSE(RFC1123StrToTime("Sunday, 06-Nov-94 08:49:37 -0100", t));
EXPECT_FALSE(RFC1123StrToTime("Sunday, 06-Nov-94 08:49:37 -0.1", t));
}
+TEST(StrUtilTest, LookupTag)
+{
+ EXPECT_EQ("", LookupTag("", "Field", ""));
+ EXPECT_EQ("", LookupTag("", "Field", nullptr));
+ EXPECT_EQ("default", LookupTag("", "Field", "default"));
+ EXPECT_EQ("default", LookupTag("Field1: yes", "Field", "default"));
+ EXPECT_EQ("default", LookupTag("Fiel: yes", "Field", "default"));
+ EXPECT_EQ("default", LookupTag("Fiel d: yes", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("Field: foo", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("Field: foo\n", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("\nField: foo\n", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("Field:foo", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("Field:foo\n", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("\nField:foo\n", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("Field:\tfoo\n", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("Field: foo \t", "Field", "default"));
+ EXPECT_EQ("foo", LookupTag("Field: foo \t\n", "Field", "default"));
+ EXPECT_EQ("Field : yes", LookupTag("Field: Field : yes \t\n", "Field", "default"));
+ EXPECT_EQ("Field : yes", LookupTag("Field:\n Field : yes \t\n", "Field", "default"));
+ EXPECT_EQ("Field : yes", LookupTag("Foo: bar\nField: Field : yes \t\n", "Field", "default"));
+ EXPECT_EQ("line1\nline2", LookupTag("Multi: line1\n line2", "Multi", "default"));
+ EXPECT_EQ("line1\nline2", LookupTag("Multi: line1\n line2\n", "Multi", "default"));
+ EXPECT_EQ("line1\nline2", LookupTag("Multi:\n line1\n line2\n", "Multi", "default"));
+ EXPECT_EQ("line1\n\nline2", LookupTag("Multi:\n line1\n .\n line2\n", "Multi", "default"));
+ EXPECT_EQ("line1\na\nline2", LookupTag("Multi:\n line1\n a\n line2\n", "Multi", "default"));
+ EXPECT_EQ("line1\nfoo\nline2", LookupTag("Multi:\n line1\n foo\n line2\n", "Multi", "default"));
+ EXPECT_EQ("line1\n line2", LookupTag("Multi: line1\n line2", "Multi", "default"));
+ EXPECT_EQ(" line1\n \t line2", LookupTag("Multi:\t \n line1\n \t line2\n", "Multi", "default"));
+ EXPECT_EQ(" line1\n\n\n \t line2", LookupTag("Multi:\t \n line1\n .\n . \n \t line2\n", "Multi", "default"));
+
+ std::string const msg =
+ "Field1: Value1\nField2:Value2\nField3:\t Value3\n"
+ "Multi-Field1: Line1\n Line2\nMulti-Field2:\n Line1\n Line2\n"
+ "Field4: Value4\nField5:Value5";
+ EXPECT_EQ("Value1", LookupTag(msg, "Field1", ""));
+ EXPECT_EQ("Value2", LookupTag(msg, "Field2", ""));
+ EXPECT_EQ("Value3", LookupTag(msg, "Field3", ""));
+ EXPECT_EQ("Line1\nLine2", LookupTag(msg, "Multi-Field1", ""));
+ EXPECT_EQ("Line1\nLine2", LookupTag(msg, "Multi-Field2", ""));
+ EXPECT_EQ("Value4", LookupTag(msg, "Field4", ""));
+ EXPECT_EQ("Value5", LookupTag(msg, "Field5", ""));
+}
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