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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
parent 5e297c356e
commit f00c7b5b41
1 changed files with 5 additions and 0 deletions
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man3/atoi.3
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@ -126,6 +126,11 @@ only.
.\" .BR atoll () .\" .BR atoll ()
.\" function is present in glibc 2 since version 2.0.2, but .\" function is present in glibc 2 since version 2.0.2, but
.\" not in libc4 or libc5. .\" 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 .SH SEE ALSO
.BR atof (3), .BR atof (3),
.BR strtod (3), .BR strtod (3),