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atoi.3: Add NOTES section explaining 0 return value on error 

And note that this is not specified by POSIX.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2020-06-19 14:19:27 +02:00
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commit f00c7b5b41
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@ -126,6 +126,11 @@ only.
.\" .BR atoll ()
.\" function is present in glibc 2 since version 2.0.2, but
.\" not in libc4 or libc5.
.SH NOTES
POSIX.1 leaves the return value of
.BR atoi ()
on error unspecified.
On glibc, musl libc, and uClibc, 0 is returned on error.
.SH SEE ALSO
.BR atof (3),
.BR strtod (3),