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include defs
# caslab - get one case label
integer function caslab (n, t)
integer n, t
character tok(MAXTOK)
integer i, s, lev
integer gnbtok, ctoi
t = gnbtok (tok, MAXTOK)
while (t == NEWLINE)
t = gnbtok (tok, MAXTOK)
if (t == EOF)
return (t)
for (lev=0; t == LPAREN; t = gnbtok (tok, MAXTOK))
lev = lev + 1
if (t == MINUS)
s = -1
else
s = +1
if (t == MINUS | t == PLUS)
t = gnbtok (tok, MAXTOK)
if (t != DIGIT)
goto 99
else {
i = 1
n = s * ctoi (tok, i)
}
for (t=gnbtok(tok,MAXTOK); t == RPAREN; t=gnbtok(tok,MAXTOK))
lev = lev - 1
if (lev != 0)
goto 99
while (t == NEWLINE)
t = gnbtok (tok, MAXTOK)
return
99 call synerr ("Invalid case label.")
n = 0
end
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