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 C_ALLXALPH()

 DESCRIPTION

 C_ALLXALPH() checks a character string to determine if it contains
 only upper or lower case alphabetic characters and numeric
 characters (A-Z, a-z, 0-9).  The alphabetic characters checked are
 ASCII 65 through 90 and ASCII 97 through 122.  The numeric
 characters checked are ASCII 48 through 57.

 SYNTAX

 C_ALLXALPH(string)

 PARAMETERS

 string (C) is the character string to check.

 RETURNS

 C_ALLXALPH() returns true (.T.) if all characters in the string are
 alphabetic and/or numeric, otherwise false (.F.).

 EXAMPLES

 ? c_allxalph("AbcDef")  --> .T.
 ? c_allxalph("Abcef1")  --> .T.
 ? c_allxalph("Abcdef ") --> .F.    && Contains a space
 ? c_allxalph("Abcdef.") --> .F.    && Contains a period