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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Be an unsigned integer?
///
/// Determine whether a string represents an unsigned integer.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// STRING I Character string.
///
/// The function returns .TRUE. if the string represents an unsigned
/// integer. Otherwise, it returns .FALSE.
/// ```
///
/// # Detailed Input
///
/// ```text
/// STRING is any string.
/// ```
///
/// # Detailed Output
///
/// ```text
/// If STRING contains a single word made entirely from the
/// characters '0' through '9', then the function returns .TRUE.
/// Otherwise, it returns .FALSE.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
/// ```
///
/// # Particulars
///
/// ```text
/// By definition an unsigned integer is a word made exclusively
/// from the characters '0', '1', '2', '3', '4', '5', '6', '7', '8',
/// and '9'.
/// ```
///
/// # Examples
///
/// ```text
/// Four classes of numbers recognized by the various BE functions.
///
/// UNS unsigned integer
/// INT integer (includes INT)
/// DEC decimal number (includes UNS, INT)
/// NUM number (includes UNS, INT, NUM)
///
/// The following table illustrates the differences between
/// the classes. (Any number of leading and trailing blanks
/// are acceptable.)
///
/// String Accepted by
/// ------------------ ------------------
/// 0 UNS, INT, DEC, NUM
/// 21
/// 21994217453648
///
/// +0 INT, DEC, NUM
/// -13
/// +21946
///
/// 1.23 DEC, NUM
/// 12.
/// .17
/// +4.1
/// -.25
///
/// 2.3e17 NUM
/// 17.D-13275849
/// -.194265E+0004
///
/// Note that the functions don't take the magnitudes of the numbers
/// into account. They may accept numbers that cannot be represented
/// in Fortran variables. (For example, '2.19E999999999999' probably
/// exceeds the maximum floating point number on any machine, but
/// is perfectly acceptable to BENUM.)
///
/// The following strings are not accepted by any of the functions.
///
/// String Reason
/// --------------- ----------------------------------------
/// 3/4 No implied operations (rational numbers)
/// 37+14 No explicit operations
/// E12 Must have mantissa
/// 217,346.91 No commas
/// 3.14 159 264 No embedded spaces
/// PI No special numbers
/// FIVE No textual numbers
/// CXIV No roman numerals
/// ```
///
/// # Author and Institution
///
/// ```text
/// J. Diaz del Rio (ODC Space)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 24-NOV-2021 (JDR)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard.
///
/// - SPICELIB Version 1.0.0, 01-DEC-1995 (WLT)
/// ```
pub fn beuns(string: &str) -> bool {
let ret = BEUNS(string.as_bytes());
ret
}
//$Procedure BEUNS ( Be an unsigned integer? )
pub fn BEUNS(STRING: &[u8]) -> bool {
let mut BEUNS: bool = false;
let mut I: i32 = 0;
let mut L: i32 = 0;
let mut OK: bool = false;
//
// SPICE functions
//
//
// Local variables
//
//
// Get the length of the string and the position of its
// first non-blank character.
//
L = intrinsics::LEN(STRING);
I = FRSTNB(STRING);
//
// If there isn't a non-blank character, this isn't an
// unsigned integer.
//
if (I == 0) {
BEUNS = false;
return BEUNS;
}
//
// As far as we know right now, everything is ok. Examine
// characters until we run out of string or until we
// hit a non-digit character.
//
OK = true;
while (OK && (I <= L)) {
if (intrinsics::INDEX(b"0123456789", fstr::substr(STRING, I..=I)) > 0) {
I = (I + 1);
} else {
OK = false;
}
}
//
// If the string still is ok as an unsigned integer, it must be
// one...
//
if OK {
BEUNS = true;
} else {
//
// ... otherwise, it's an unsigned integer if the remainder is blank.
//
BEUNS = fstr::eq(fstr::substr(STRING, I..), b" ");
}
BEUNS
}