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in the same way as groff:
* \\ is always reduced to \
* \. is always reduced to .
* other undefined escape sequences are usually reduced to the escape name,
for example \G to G, except during the expansion of expanding escape
sequences having the standard argument form (in particular \* and \n),
in which case the backslash is preserved literally.
Yes, this is confusing indeed.
For example, the following have the same meaning:
* .ds \. and .ds . which is not the same as .ds \\.
* \*[\.] and \*[.] which is not the same as \*[\\.]
* .ds \G and .ds G which is not the same as .ds \\G
* \*[\G] and \*[\\G] which is not the same as \*[G] <- sic!
To feel less dirty, have a leaning toothpick, if you are so inclined.
This patch also slightly improves the string shown by the "escaped
character not allowed in a name" error message.
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by allowing the preprocessor to pass it through to the formatters.
Used for example by the groff_char(7) manual page.
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Observed by Werner Lemberg on Nov 14, 2011
and rotting on my TODO list ever since.
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With roff_getstrn(), provide finer control which definitions
can be used for what:
* All definitions can be used for .if d tests and .am appending.
* User-defined for \* expansion, .dei expansion, and macro calling.
* Predefined for \* expansion.
* Standard macros, original or renamed, for macro calling.
Several related improvements while here:
* Do not return string table entries that have explicitly been removed.
* Do not create a rentab entry when trying to rename a non-existent macro.
* Clear an existing rentab entry when the external interface
roff_setstr() is called with its name.
* Avoid trailing blanks in macro lines generated from renamed
and from aliased macros.
* Delete the duplicate __m*_reserved[] tables, just use roff_name[].
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Both kristaps@ and wiz@ repeated asked for this,
literally for years.
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