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include defs
# gctoi --- convert any radix string to single precision integer
integer function gctoi (str, i, radix)
character str (ARB)
integer i, radix
integer base, v, d, j
external index
integer index
character clower
logical neg
string digits "0123456789abcdef"
v = 0
base = radix
while (str (i) == BLANK | str (i) == TAB)
i = i + 1
neg = (str (i) == MINUS)
if (str (i) == PLUS | str (i) == MINUS)
i = i + 1
if (str (i + 2) == LETR & str (i) == DIG1 & IS_DIGIT(str (i + 1))
| str (i + 1) == LETR & IS_DIGIT(str (i))) {
base = str (i) - DIG0
j = i
if (str (i + 1) != LETR) {
j = j + 1
base = base * 10 + (str (j) - DIG0)
}
if (base < 2 | base > 16)
base = radix
else
i = j + 2
}
for (; str (i) != EOS; i = i + 1) {
if (IS_DIGIT(str (i)))
d = str (i) - DIG0
else
d = index (digits, clower (str (i))) - 1
if (d < 0 | d >= base)
break
v = v * base + d
}
if (neg)
return (-v)
else
return (+v)
end
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