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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
These functions return a pointer to the beginning of the
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
For an explanation of the terms used in this section, see
.BR attributes (7).