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Clarify Freplace_match logic

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* src/search.c (Freplace_match): Add some doc strings to clarify
the logic and do a minor clean up (bug#19208).
This commit is contained in:
Lars Ingebrigtsen 2019-08-03 15:29:04 +02:00
parent 6c7ab768ee
commit f77a395146
1 changed files with 6 additions and 2 deletions
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8
src/search.c
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@ -2397,11 +2397,15 @@ since only regular expressions have distinguished subexpressions. */)
else
{
CHECK_FIXNUM (subexp);
if (! (0 <= XFIXNUM (subexp) && XFIXNUM (subexp) < search_regs.num_regs))
args_out_of_range (subexp, make_fixnum (search_regs.num_regs));
sub = XFIXNUM (subexp);
/* Sanity check to see whether the subexp is larger than the
allowed number of sub-regexps. */
if (sub >= 0 && sub > search_regs.num_regs)
args_out_of_range (subexp, make_fixnum (search_regs.num_regs));
}
/* Sanity check to see whether the text to replace is present in the
buffer/string. */
if (NILP (string))
{
if (search_regs.start[sub] < BEGV