revstr <- function(x) sapply(lapply(strsplit(x, NULL), rev), paste, collapse="")
#' Encontra a merda do digito verificador de um numero cnj
#'
#' @export
calcula_digito <- function(num, monta = FALSE) {
NNNNNNN <- substr(num, 1L, 7L)
AAAA <- substr(num, 8L, 11L)
JTR <- substr(num, 12L, 14L)
OOOO <- substr(num, 15L, 18L)
n1 <- sprintf('%02d', as.numeric(NNNNNNN) %% 97)
n2 <- sprintf('%02d', as.numeric(sprintf('%s%s%s', n1, AAAA, JTR)) %% 97)
n3 <- sprintf('%02d', 98 - ((as.numeric(sprintf('%s%s', n2, OOOO)) * 100) %% 97))
dig <- n3
if(monta) {
return(sprintf('%s%s%s', substr(num, 1, 7), dig, substr(num, 8, 18)))
}
return(dig)
}
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