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authorMichael Vogt <mvo@ubuntu.com>2014-11-06 08:55:06 +0100
committerMichael Vogt <mvo@ubuntu.com>2014-11-06 08:55:06 +0100
commit9397ea947c23c0957a683152360909810340abce (patch)
tree6b29e35b9ef602c15d0aab20eefdec3138eb4692 /apt-pkg/contrib/strutl.cc
parent87ecd6a2d719aeaeedd99dd500b467e966376f1c (diff)
parent6e2261d0f250406058d66b360080aa986953ae19 (diff)
Merge remote-tracking branch 'upstream/debian/experimental' into feature/no-more-acquire-guessing
Conflicts: apt-pkg/acquire-item.cc
Diffstat (limited to 'apt-pkg/contrib/strutl.cc')
-rw-r--r--apt-pkg/contrib/strutl.cc124
1 files changed, 66 insertions, 58 deletions
diff --git a/apt-pkg/contrib/strutl.cc b/apt-pkg/contrib/strutl.cc
index aad358a55..ebf9c9ea6 100644
--- a/apt-pkg/contrib/strutl.cc
+++ b/apt-pkg/contrib/strutl.cc
@@ -779,86 +779,94 @@ string TimeRFC1123(time_t Date)
In particular: this reads blocks from the input until it believes
that it's run out of input text. Each block is terminated by a
- double newline ('\n' followed by '\n'). As noted below, there is a
- bug in this code: it assumes that all the blocks have been read if
- it doesn't see additional text in the buffer after the last one is
- parsed, which will cause it to lose blocks if the last block
- coincides with the end of the buffer.
+ double newline ('\n' followed by '\n').
*/
bool ReadMessages(int Fd, vector<string> &List)
{
char Buffer[64000];
- char *End = Buffer;
// Represents any left-over from the previous iteration of the
// parse loop. (i.e., if a message is split across the end
// of the buffer, it goes here)
string PartialMessage;
-
- while (1)
- {
- int Res = read(Fd,End,sizeof(Buffer) - (End-Buffer));
+
+ do {
+ int const Res = read(Fd, Buffer, sizeof(Buffer));
if (Res < 0 && errno == EINTR)
continue;
-
- // Process is dead, this is kind of bad..
+
+ // process we read from has died
if (Res == 0)
return false;
-
+
// No data
- if (Res < 0 && errno == EAGAIN)
+ if (Res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
return true;
if (Res < 0)
return false;
-
- End += Res;
-
- // Look for the end of the message
- for (char *I = Buffer; I + 1 < End; I++)
+
+ // extract the message(s) from the buffer
+ char const *Start = Buffer;
+ char const * const End = Buffer + Res;
+
+ char const * NL = (char const *) memchr(Start, '\n', End - Start);
+ if (NL == NULL)
{
- if (I[1] != '\n' ||
- (I[0] != '\n' && strncmp(I, "\r\n\r\n", 4) != 0))
- continue;
-
- // Pull the message out
- string Message(Buffer,I-Buffer);
- PartialMessage += Message;
-
- // Fix up the buffer
- for (; I < End && (*I == '\n' || *I == '\r'); ++I);
- End -= I-Buffer;
- memmove(Buffer,I,End-Buffer);
- I = Buffer;
-
- List.push_back(PartialMessage);
- PartialMessage.clear();
+ // end of buffer: store what we have so far and read new data in
+ PartialMessage.append(Start, End - Start);
+ Start = End;
}
- if (End != Buffer)
- {
- // If there's text left in the buffer, store it
- // in PartialMessage and throw the rest of the buffer
- // away. This allows us to handle messages that
- // are longer than the static buffer size.
- PartialMessage += string(Buffer, End);
- End = Buffer;
- }
else
- {
- // BUG ALERT: if a message block happens to end at a
- // multiple of 64000 characters, this will cause it to
- // terminate early, leading to a badly formed block and
- // probably crashing the method. However, this is the only
- // way we have to find the end of the message block. I have
- // an idea of how to fix this, but it will require changes
- // to the protocol (essentially to mark the beginning and
- // end of the block).
- //
- // -- dburrows 2008-04-02
- return true;
- }
+ ++NL;
+
+ if (PartialMessage.empty() == false && Start < End)
+ {
+ // if we start with a new line, see if the partial message we have ended with one
+ // so that we properly detect records ending between two read() runs
+ // cases are: \n|\n , \r\n|\r\n and \r\n\r|\n
+ // the case \r|\n\r\n is handled by the usual double-newline handling
+ if ((NL - Start) == 1 || ((NL - Start) == 2 && *Start == '\r'))
+ {
+ if (APT::String::Endswith(PartialMessage, "\n") || APT::String::Endswith(PartialMessage, "\r\n\r"))
+ {
+ PartialMessage.erase(PartialMessage.find_last_not_of("\r\n") + 1);
+ List.push_back(PartialMessage);
+ PartialMessage.clear();
+ while (NL < End && (*NL == '\n' || *NL == '\r')) ++NL;
+ Start = NL;
+ }
+ }
+ }
+
+ while (Start < End) {
+ char const * NL2 = (char const *) memchr(NL, '\n', End - NL);
+ if (NL2 == NULL)
+ {
+ // end of buffer: store what we have so far and read new data in
+ PartialMessage.append(Start, End - Start);
+ break;
+ }
+ ++NL2;
+
+ // did we find a double newline?
+ if ((NL2 - NL) == 1 || ((NL2 - NL) == 2 && *NL == '\r'))
+ {
+ PartialMessage.append(Start, NL2 - Start);
+ PartialMessage.erase(PartialMessage.find_last_not_of("\r\n") + 1);
+ List.push_back(PartialMessage);
+ PartialMessage.clear();
+ while (NL2 < End && (*NL2 == '\n' || *NL2 == '\r')) ++NL2;
+ Start = NL2;
+ }
+ NL = NL2;
+ }
+
+ // we have read at least one complete message and nothing left
+ if (PartialMessage.empty() == true)
+ return true;
if (WaitFd(Fd) == false)
return false;
- }
+ } while (true);
}
/*}}}*/
// MonthConv - Converts a month string into a number /*{{{*/