Index Page errch_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
       void errch_c ( ConstSpiceChar * marker,
                      ConstSpiceChar * string )
#### Abstract
       Substitute a character string for the first occurrence of
       a marker in the current long error message.
#### Required_Reading
       ERROR
#### Keywords
       ERROR
       CONVERSION
#### Brief_I/O
       VARIABLE  I/O  DESCRIPTION
       --------  ---  ---------------------------------------------------
       marker     I   A substring of the error message to be replaced.
       string     I   The character string to substitute for marker.
#### Detailed_Input
       marker     is a character string that marks a position in
                  the long error message where a character string
                  is to be substituted.  Leading and trailing blanks
                  in marker are not significant.

                  Case IS significant:  "XX" is considered to be
                  a different marker from "xx".

       string     is a character string that will be substituted for
                  the first occurrence of marker in the long error
                  message.  This occurrence of the substring indicated
                  by marker will be removed and replaced by string.
                  Leading and trailing blanks in string are not
                  significant.  However, if string is completely blank,
                  a single blank character will be substituted for
                  the marker.
#### Detailed_Output
       None.
#### Parameters
       LMSGLN  is the maximum length of the long error message.  See
               the include file errhnd.inc for the value of LMSGLN.
#### Exceptions
       1)  If the character string resulting from the substitution
           exceeds the maximum length of the long error message, the
           long error message is truncated on the right.  No error is
           signaled.

       2)  If marker is blank, no substitution is performed.  No error
           is signaled.

       3)  If string is blank, then the first occurrence of marker is
           replaced by a single blank.

       4)  If marker does not appear in the long error message, no
           substitution is performed.  No error is signaled.

       5)  If changes to the long error message are disabled, this
           routine has no effect.

       6) The error SPICE(EMPTYSTRING) is signaled if either input string
          does not contain at least one character, since an input string
          cannot be converted to a Fortran-style string in this case.

       7) The error SPICE(NULLPOINTER) is signalled if either string pointer
          argument is null.
#### Files
       None.
#### Particulars
       The purpose of this routine is to allow you to tailor the long
       error message to include specific information that is available
       only at run time.  This capability is somewhat like being able to
       put variables in your error messages.
#### Examples
       1)   In this example, the marker is  "#".  We'll signal a file
            open error, and we'll include in the error message the name
            of the file we tried to open.  There are three steps:

               -- Set the long message, using a marker for the location
                  where a value is to be substituted.

               -- Substitute the file name into the error message.

               -- Signal the error (causing output of error messages)
                  using the CSPICE routine sigerr_c.

               /.
               Error on file open attempt.  Signal an error.
               The character string variable FILE contains the
               file name.

               After the call to errch_c, the long error message
               will contain the file name held in the string
               FILE.  For example, if FILE contains the name
               "MYFILE.DAT", the long error message will be

                   "File open error.  File is MYFILE.DAT."

               ./

               setmsg_c ( "File open error.  File is #." );
               errch_c  ( "#",  FILE                     );
               sigerr_c ( "SPICE(FILEOPENFAILED)"        );

       2)   Same example as (1), except this time we'll use a better-
            looking and more descriptive marker than "#".  Instead,
            we'll use the marker "FILENAME".  This does not affect the
            long error message; it just makes the code more readable.

               /.
               Error on file open attempt.  Signal an error.
               The character string variable FILE contains the
               file name.
               ./

               setmsg_c ( "File open error. File is FILENAME.");
               errch_c  ( "FILENAME",  FILE                   );
               sigerr_c ( "SPICE(FILEOPENFAILED)"             );

       3)   Same example as (2), except this time there's a problem with
            the variable FILE: it's blank.  This time, the code fragment

               /.
               Error on file open attempt.  Signal an error.
               The character string variable FILE contains the
               file name.
               ./
               setmsg_c ( "File open error. File is FILENAME." );
               errch_c  ( "FILENAME",  FILE                    );

            sets the long error message to

               "File open error.  File is  "
#### Restrictions
       1) The caller must ensure that the message length, after sub-
          stitution is performed, doesn't exceed LMSGLN characters.
          See errch.c.
#### Literature_References
       None.
#### Author_and_Institution
       J.E. McLean     (JPL)
       N.J. Bachman    (JPL)
#### Version
       -CSPICE Version 1.2.0, 08-FEB-1998 (NJB)

          Re-implemented routine without dynamically allocated, temporary
          strings.  Made various header fixes.

       -CSPICE Version 1.0.0, 25-OCT-1997   (EDW)
#### Index_Entries
       insert string into error message text
#### Link to routine errch_c source file errch_c.c

    Wed Jun  9 13:05:23 2010