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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Character position
///
/// Find the first occurrence in a string of a character belonging
/// to a collection of characters, starting at a specified location,
/// searching forward.
///
/// # 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 first character of STR
/// at or following 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 first character of STR
/// (at or following 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, the search begins at the first
/// character of the string.
///
/// 2) If START is greater than the length of the string, CPOS
/// returns zero.
/// ```
///
/// # Particulars
///
/// ```text
/// CPOS 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 names.
/// ```
///
/// # Examples
///
/// ```text
/// Let STRING = 'BOB, JOHN, TED, AND MARTIN....'
/// 123456789012345678901234567890
///
/// Normal (sequential) searching
/// -----------------------------
///
/// CPOS( STRING, ' ,', 1 ) = 4
///
/// CPOS( STRING, ' ,', 5 ) = 5
///
/// CPOS( STRING, ' ,', 6 ) = 10
///
/// CPOS( STRING, ' ,', 11 ) = 11
///
/// CPOS( STRING, ' ,', 12 ) = 15
///
/// CPOS( STRING, ' ,', 16 ) = 16
///
/// CPOS( STRING, ' ,', 17 ) = 20
///
/// CPOS( STRING, ' ,', 21 ) = 0
///
///
/// START out of bounds
/// -------------------
///
/// CPOS( STRING, ' ,', -113 ) = 4
///
/// CPOS( STRING, ' ,', -1 ) = 4
///
/// CPOS( STRING, ' ,', 31 ) = 0
///
/// CPOS( STRING, ' ,', 1231 ) = 0
///
///
/// Order within CHARS
/// ------------------
///
/// CPOS( STRING, ',. ', 22 ) = 27
///
/// CPOS( STRING, ' ,.', 22 ) = 27
///
/// CPOS( STRING, ', .', 22 ) = 27
/// ```
///
/// # 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, 02-JUL-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 cpos(str: &str, chars: &str, start: i32) -> i32 {
let ret = CPOS(str.as_bytes(), chars.as_bytes(), start);
ret
}
//$Procedure CPOS ( Character position )
pub fn CPOS(STR: &[u8], CHARS: &[u8], START: i32) -> i32 {
let mut CPOS: 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::MAX0(&[1, START]);
FOUND = false;
CPOS = 0;
while !FOUND {
if (B > LENSTR) {
return CPOS;
} else if (intrinsics::INDEX(CHARS, fstr::substr(STR, B..=B)) != 0) {
CPOS = B;
return CPOS;
} else {
B = (B + 1);
}
}
CPOS
}