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7.5.6.4 Arg Type Keyword

arg-type = keyword;

The argument must match a specified list of strings (see section Keyword list). Assuming you have named the option, optn-name, the strings will be converted into an enumeration of type te_Optn_Name with the values OPTN_NAME_KEYWORD.* If you have not specified a default value, the value OPTN_NAME_UNDEFINED will be inserted with the value zero. The option will be initialized to that value. You may now use this in your code as follows:

 
te_Optn_Name opt = OPT_VALUE_OPTN_NAME;
switch (opt) {
case OPTN_NAME_UNDEFINED:  /* undefined things */ break;
case OPTN_NAME_KEYWORD:    /* `keyword' things */ break;
default: /* utterly impossible */ ;
}

AutoOpts produces a special purpose procedure for this option.

If you have need for the string name of the selected keyword, you may obtain this with the macro, OPT_OPTN_NAME_VAL2STR(val). The value you pass would normally be OPT_VALUE_OPTN_NAME, but anything with numeric value that is legal for te_Optn_Name may be passed. Anything out of range will result in the string, "*INVALID*" being returned. The strings are read only. It may be used as in:

 
te_Optn_Name opt = OPT_VALUE_OPTN_NAME;
printf( "you selected the %s keyword\n",
        OPT_OPTN_NAME_VAL2STR(opt) );

* Note: you may replace the OPTN_NAME enumeration prefix with another prefix by specifying a prefix-enum attribute.


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