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C comment: clarify why psql's help/exit/quit must alone

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Document why no indentation and why no non-whitespace postfix is
supported.

Backpatch-through: master
This commit is contained in:
Bruce Momjian 2019-12-21 17:02:38 -05:00
parent 4cab43ec80
commit 4376fdbae1
1 changed files with 7 additions and 2 deletions
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9
src/bin/psql/mainloop.c
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@ -237,7 +237,13 @@ MainLoop(FILE *source)
bool found_exit_or_quit = false;
bool found_q = false;
/* Search for the words we recognize; must be first word */
/*
* The assistance words, help/exit/quit, must have no
* whitespace before them, and only whitespace after, with an
* optional semicolon. This prevents indented use of these
* words, perhaps as identifiers, from invoking the assistance
* behavior.
*/
if (pg_strncasecmp(first_word, "help", 4) == 0)
{
rest_of_line = first_word + 4;
@ -249,7 +255,6 @@ MainLoop(FILE *source)
rest_of_line = first_word + 4;
found_exit_or_quit = true;
}
else if (strncmp(first_word, "\\q", 2) == 0)
{
rest_of_line = first_word + 2;