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ec98a4ad5b
...by which I mean from high line number to low, not, actually
backward character by character!
Commit:
commit 62f29fda90cf1d5a1899f57ef78452471c707fd6
Date: Tue Oct 9 22:21:05 2018 -0600
Highlight source code using GNU Source Highlight
introduced a regression in the test gdb.linespec/explicit.exp, in
which a request is made to GDB to print a reverse sequence of lines,
from +10 to -10 from the current line number. The expected behaviour
is that GDB prints nothing. The above commit changed this so that GDB
now prints:
Line number 32 out of range; /path/to/gdb/testsuite/gdb.linespec/explicit.c has 71 lines.
which is a little confusing.
This commit fixes the regression, and restores the behaviour that GDB
prints nothing.
While I was passing I noticed a call to `back` on a std::string that I
was concerned could be empty if the request for source lines returns
an empty string. I don't know if it would be possible for a request
for lines to return an empty string, I guess it should be impossible,
in which case, maybe this should be an assertion, but adding a `empty`
check, seems like an easy and cheap safety net.
gdb/ChangeLog:
* source.c (print_source_lines_base): Handle requests to print
reverse line number sequences, and guard against empty lines
string.
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