Index Page bschoc_c

A B C D E F G H I J K L M N O P Q R S T U V W X

Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input | Detailed_Output Parameters Exceptions Files Particulars Examples | Restrictions Literature_References Author_and_Institution Version Index_Entries

#### Procedure

       SpiceInt bschoc_c ( ConstSpiceChar  * value,
                           SpiceInt          ndim,
                           SpiceInt          lenvals,
                           const void      * array,
                           ConstSpiceInt   * order    )

#### Abstract

       Do a binary search for a given value within a character string array,
       accompanied by an order vector.  Return the index of the matching array
       entry, or -1 if the key value is not found.

#### Required_Reading

       None.

#### Keywords

       ARRAY,  SEARCH

#### Brief_I/O

       VARIABLE  I/O              DESCRIPTION
       --------  ---  --------------------------------------------------
       value      I   Key value to be found in array.
       ndim       I   Dimension of array.
       lenvals    I   String length.
       array      I   Character string array to search.
       order      I   Order vector.

       The function returns the index of the first matching array
       element or -1 if the value is not found.

#### Detailed_Input

       value       is the key value to be found in the array.  Trailing
                   blanks space in this key are not significant:  string
                   matches found by this routine do not require trailing
                   blanks in value to match those in the corresponding
                   element of array.

       ndim        is the dimension of the array.

       lenvals     is the declared length of the strings in the input
                   string array, including null terminators.  The input
                   array should be declared with dimension

                      [ndim][lenvals]

       array       is the array of character srings to be searched.  Trailing
                   blanks in the strings in this array are not significant.

       order       is an order vector which can be used to access the elements
                   of array in order.  The contents of order are a permutation
                   of the sequence of integers ranging from zero to ndim-1.

#### Detailed_Output

       The function returns the index of the specified value in the input array.
       Indices range from zero to ndim-1.

       If the input array does not contain the specified value, the function
       returns -1.

       If the input array contains more than one occurrence of the specified
       value, the returned index may point to any of the occurrences.

#### Parameters

       None.

#### Exceptions

       1) If ndim < 1 the function value is -1.  This is not considered
          an error.

       2) If input key value pointer is null, the error SPICE(NULLPOINTER) will
          be signaled.  The function returns -1.

       3) The input key value may have length zero.  This case is not
          considered an error.

       4) If the input array pointer is null,  the error SPICE(NULLPOINTER) will
          be signaled.  The function returns -1.

       5) If the input array string's length is less than 2, the error
          SPICE(STRINGTOOSHORT) will be signaled.  The function returns -1.

       6) If memory cannot be allocated to create a Fortran-style version of
          the input order vector, the error SPICE(MALLOCFAILED) is signaled.
          The function returns -1 in this case.

#### Files

       None.

#### Particulars

       A binary search is performed on the input array, whose order is given
       by an associated order vector.  If an element of the array is found to
       match the input value, the index of that element is returned. If no
       matching element is found, -1 is returned.

#### Examples

       Let the input arguments array and order contain the following elements:

            array           order

          "FEYNMAN"           1
          "BOHR"              2
          "EINSTEIN"          0
          "NEWTON"            4
          "GALILEO"           3

       Then

          bschoc_c ( "NEWTON",   5, lenvals, array, order )    ==   3
          bschoc_c ( "EINSTEIN", 5, lenvals, array, order )    ==   2
          bschoc_c ( "GALILEO",  5, lenvals, array, order )    ==   4
          bschoc_c ( "Galileo",  5, lenvals, array, order )    ==  -1
          bschoc_c ( "BETHE",    5, lenvals, array, order )    ==  -1

#### Restrictions

       1)  The input array is assumed to be sorted in increasing order. If
           this condition is not met, the results of bschoc_c are unpredictable.

       2)  String comparisons performed by this routine are Fortran-style:
           trailing blanks in the input array or key value are ignored.
           This gives consistent behavior with CSPICE code generated by
           the f2c translator, as well as with the Fortran SPICE Toolkit.

           Note that this behavior is not identical to that of the ANSI
           C library functions strcmp and strncmp.

#### Literature_References

       None

#### Author_and_Institution

       N.J. Bachman    (JPL)
       W.L. Taber      (JPL)
       I.M. Underwood  (JPL)

#### Version

       -CSPICE Version 1.1.0, 07-MAR-2009 (NJB)

           This file now includes the header file f2cMang.h.
           This header supports name mangling of f2c library
           functions.

           Header sections were re-ordered.

       -CSPICE Version 1.0.0, 26-AUG-2002 (NJB) (WLT) (IMU)

#### Index_Entries

       search in a character array

#### Link to routine bschoc_c source file bschoc_c.c

    Wed Apr  5 17:54:29 2017