V3/usr/man/man3/atoi.3

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NAME		atoi -- ascii to integer
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SYNOPSIS	jsr	r5,atoi; subr
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DESCRIPTION	atoi____
will convert an ascii stream to a binary
number returned in r1.

The subroutine subr____
(supplied by the caller)
is called on r5 for each character of the
ascii stream.
subr____ should return the character in r0.
The first character not used in the conversion
is left in r0.
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The numbers recognized are:  an optional minus sign
followed by a string of digits.
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The subroutine subr____ must not disturb any registers.
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FILES		kept in /lib/liba.a
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SEE ALSO	--
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DIAGNOSTICS	There are none;
the routine charges on regardless of consequences; see BUGS.
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BUGS		It
pays no attention to overflow - you get whatever the machine
instructions mul and div happen to leave in the low order half
- in fact, the carry bit should be set and isn't.
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The routine should accept initial "+" and initial blanks.