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strstr.3: Document special case for empty needle 

Reported-by: Stefan Kanthak <stefan.kanthak@nexgo.de>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Alejandro Colomar 2021-07-28 22:20:03 +02:00 committed by Michael Kerrisk
parent f05d7043fe
commit ec415ad970
1 changed files with 8 additions and 0 deletions
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man3/strstr.3
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@ -61,6 +61,14 @@ but ignores the case of both arguments.
.SH RETURN VALUE .SH RETURN VALUE
These functions return a pointer to the beginning of the These functions return a pointer to the beginning of the
located substring, or NULL if the substring is not found. located substring, or NULL if the substring is not found.
.PP
Note the special case:
If
.I needle
is the empty string,
the return value is always
.I haystack
itself.
.SH ATTRIBUTES .SH ATTRIBUTES
For an explanation of the terms used in this section, see For an explanation of the terms used in this section, see
.BR attributes (7). .BR attributes (7).