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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Character position, reverse
///
/// Find the first occurrence in a string of a character belonging
/// to a collection of characters, starting at a specified location,
/// searching in reverse.
///
/// # Required Reading
///
/// * [SCANNING](crate::required_reading::scanning)
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// STR I Any character string.
/// CHARS I A collection of characters.
/// START I Position to begin looking for one of CHARS
///
/// The function returns the index of the last character of STR
/// at or before index START that is in the collection CHARS.
/// ```
///
/// # Detailed Input
///
/// ```text
/// STR is any character string.
///
/// CHARS is a character string containing a collection of
/// characters. Spaces in CHARS are significant.
///
/// START is the position in STR to begin looking for one of the
/// characters in CHARS.
/// ```
///
/// # Detailed Output
///
/// ```text
/// The function returns the index of the last character of STR (at
/// or before index START) that is one of the characters in the
/// string CHARS. If none of the characters is found, the function
/// returns zero.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
///
/// 1) If START is less than 1, CPOSR returns zero.
///
/// 2) If START is greater than LEN(STRING), the search begins
/// at the last character of the string.
/// ```
///
/// # Particulars
///
/// ```text
/// CPOSR is case sensitive.
///
/// An entire family of related SPICELIB routines (POS, CPOS, NCPOS,
/// POSR, CPOSR, NCPOSR) is described in the Required Reading.
///
/// Those familiar with the True BASIC language should note that
/// these functions are equivalent to the True BASIC intrinsic
/// functions with the same name.
/// ```
///
/// # Examples
///
/// ```text
/// Let STRING = 'BOB, JOHN, TED, AND MARTIN '
/// 123456789012345678901234567890
///
/// Normal (sequential) searching:
/// ------------------------------
///
/// CPOSR( STRING, ' ,', 30 ) = 30
///
/// CPOSR( STRING, ' ,', 29 ) = 29
///
/// CPOSR( STRING, ' ,', 28 ) = 28
///
/// CPOSR( STRING, ' ,', 27 ) = 27
///
/// CPOSR( STRING, ' ,', 26 ) = 20
///
/// CPOSR( STRING, ' ,', 19 ) = 16
///
/// CPOSR( STRING, ' ,', 15 ) = 15
///
/// CPOSR( STRING, ' ,', 14 ) = 11
///
/// CPOSR( STRING, ' ,', 10 ) = 10
///
/// CPOSR( STRING, ' ,', 9 ) = 5
///
/// CPOSR( STRING, ' ,', 4 ) = 4
///
/// CPOSR( STRING, ' ,', 3 ) = 0
///
/// START out of bounds:
/// --------------------
///
/// CPOSR( STRING, ' ,', 231 ) = 30
///
/// CPOSR( STRING, ' ,', 31 ) = 30
///
/// CPOSR( STRING, ' ,', 0 ) = 0
///
/// CPOSR( STRING, ' ,', -10 ) = 0
///
///
/// Order within CHARS
/// ------------------
///
/// CPOSR( STRING, 'JOHN', 23 ) = 18
///
/// CPOSR( STRING, 'OHNJ', 23 ) = 18
///
/// CPOSR( STRING, 'HNJO', 23 ) = 18
///
/// CPOSR( STRING, 'NJOH', 23 ) = 18
/// ```
///
/// # Author and Institution
///
/// ```text
/// J. Diaz del Rio (ODC Space)
/// H.A. Neilan (JPL)
/// B.V. Semenov (JPL)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 13-AUG-2021 (JDR)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard.
///
/// - SPICELIB Version 1.0.3, 31-JAN-2008 (BVS)
///
/// Removed non-standard end-of-declarations marker
/// 'C%&END_DECLARATIONS' from comments.
///
/// - SPICELIB Version 1.0.2, 10-MAR-1992 (WLT)
///
/// Comment section for permuted index source lines was added
/// following the header.
///
/// - SPICELIB Version 1.0.1, 26-MAR-1991 (HAN)
///
/// The Required Reading file POSITION was renamed to SCANNING.
/// This header was updated to reflect the change.
///
/// - SPICELIB Version 1.0.0, 31-JAN-1990 (WLT)
/// ```
pub fn cposr(str: &str, chars: &str, start: i32) -> i32 {
let ret = CPOSR(str.as_bytes(), chars.as_bytes(), start);
ret
}
//$Procedure CPOSR ( Character position, reverse )
pub fn CPOSR(STR: &[u8], CHARS: &[u8], START: i32) -> i32 {
let mut CPOSR: i32 = 0;
let mut FOUND: bool = false;
let mut LENSTR: i32 = 0;
let mut B: i32 = 0;
//
// Local variables
//
LENSTR = intrinsics::LEN(STR);
B = intrinsics::MIN0(&[LENSTR, START]);
FOUND = false;
CPOSR = 0;
while !FOUND {
if (B <= 0) {
return CPOSR;
} else if (intrinsics::INDEX(CHARS, fstr::substr(STR, B..=B)) != 0) {
CPOSR = B;
return CPOSR;
} else {
B = (B - 1);
}
}
CPOSR
}