search for: xxungetc

...proposed patch. In the files src/main/gram.y and src/main/gram.c strings are parsed with the StringValue function. Looking at the function it is clear that a newline character (not the two-byte '\n') generates an error: static int StringValue(int c) { ... if (c == '\n') { xxungetc(c); return ERROR; } ... } I tracked this code down and Mark Bravington confirmed (by building r-devel on Windows) that commenting out the four lines that start with if (c == '\n') will allow R to handle multi-line strings either with or without backslashes for continuation. A ...

...appear to be completely unresponsive because all input is being eaten > by the string readers. I think the following patch in StringValue might address Peter Dalgaard's point: when a bare newline is found (i.e. not preceded by a backslash), it's pushed back onto the character stack via xxungetc(c) and StringValue pretends that it's just read a backslash instead. Then, as usual, it looks for the next character which is of course a newline, and proceeds as normal. Output is from diff gram.c on R-devel from 7/9/2004. I hope the comments look sufficiently standard now (I'm not a C pr...