matGetErrno (C and Fortran)

typedef enum {
    mat_NO_ERROR = 0,
    mat_UNKNOWN_ERROR,
    mat_GENERIC_READ_ERROR,
    mat_GENERIC_WRITE_ERROR,

    mat_INDEX_TOO_BIG,
    /* Read-time error indicating that (typically) an index or dimension
     * written on a 64-bit platform exceeds 2^32, and we're trying to
     * read it on a 32-bit platform. */

    mat_FILE_FORMAT_VIOLATION,	
    /* Read-time error indicating that some data or structure internal to
     * MAT file is bad - damaged or written improperly. */

    mat_FAIL_TO_IDENTIFY,
    /* Read-time error indicating that the contents of the file do not
     * match any known type of MAT file. */

    mat_BAD_ARGUMENT,
    /* Unsuitable data was passed to the MAT API */

    mat_OUTPUT_BAD_DATA,
    /* Write-time error indicating that something in the mxArray makes it
     * not suitable to write. */

    mat_FULL_OBJECT_OUTPUT_CONVERT,
    /* Write-time error indicating that conversion of an object (opaque or
     * OOPS) to a saveable form, has failed.  In this case the object is the
     * value of a variable, and the variable will not be saved at all. */

    mat_PART_OBJECT_OUTPUT_CONVERT,	
    /* Write-time error indicating that conversion of an object (opaque or
     * OOPS) to a saveable form, has failed.  In this case the object is
     * the value in a field or element of a variable, and the variable
     * will be saved with an empty in that field or element. */

    mat_FULL_OBJECT_INPUT_CONVERT,	
    /* Read-time error indicating that conversion of saveable data
     * to an object (opaque or OOPS), has failed.  In this case the object
     * is the value of a variable, and the variable has not been loaded. */

    mat_PART_OBJECT_INPUT_CONVERT,	
    /* Read-time error indicating that conversion of saveable data
     * to an object (opaque or OOPS), has failed.  In this case the object is
     * the value in a field or element of a variable, and the variable
     * will be loaded with an empty in that field or element. */

    mat_OPERATION_NOT_SUPPORTED,    
    /* Error indicating that the particular MAT API operation is
     * not supported on this kind of MAT file, or this kind of stream. */

    mat_OUT_OF_MEMORY,         
    /* Operations internal to the MAT library encountered out-of-memory. */

    mat_BAD_VARIABLE_NAME,
    /* The name for a MATLAB variable contains illegal characters,
     * or exceeds the length allowed for that file format. */

    mat_OPERATION_PROHIBITED_IN_WRITE_MODE,
    /* The operation requested is only available when the file is open
       in Read or Update mode.  For example: matGetDir. */

    mat_OPERATION_PROHIBITED_IN_READ_MODE,
    /* The operation requested is only available when the file is open
       in Write or Update mode.  For example: matPutVariable. */

    mat_WRITE_VARIABLE_DOES_NOT_EXIST,
    /* A write operation that requires a variable already exist did not find the
     * variable in the file.  For example: matDeleteVariable. */

    mat_READ_VARIABLE_DOES_NOT_EXIST,
    /* A read operation that requires a variable already exist did not find the
     * variable in the file.  For example: matGetVariable. */

    mat_FILESYSTEM_COULD_NOT_OPEN,
    /* The MAT module could not open the requested file. */

    mat_FILESYSTEM_COULD_NOT_OPEN_TEMPORARY,
    /* The MAT module could not open a temporary file. */

    mat_FILESYSTEM_COULD_NOT_REOPEN,
    /* The MAT module could not REopen the requested file. */

    mat_BAD_OPEN_MODE,
    /* The mode argument to matOpen did not match any expected value */

    mat_FILESYSTEM_ERROR_ON_CLOSE,
    /* The MAT module got an error while fclose-ing the file.  Might indicate a full
     * filesystem.  */

} matError;