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- /*********
- * cmonthn.c by Leonard Zerman
- * Placed in the public domain by Tom Rettig Associates, 10/22/1990.
- *
- * Syntax: CMONTHN(<expN>)
- * Return: character month from <expN>
- * NULL if invalid month.
- * Minimum month is 1, maximum month is 12.
- ********/
-
- #include "trlib.h"
-
- TRTYPE cmonthn() /* declare the cmonthn function */
- {
- static char funcname[] = {"cmonthn"}; /* program name for errors */
- int month;
- static char *lookup[13]= /* declare static look-up array */
- { MONTH0, MONTH1, MONTH2, MONTH3, MONTH4, MONTH5, MONTH6,
- MONTH7, MONTH8, MONTH9, MONTH10, MONTH11, MONTH12
- }; /* months are #defined in trlib.h */
-
- if (PCOUNT == 1 && ISNUM(1)) /* check passed parms */
- {
- month = _parni(1); /* assign vars */
- _retc( (month>=1 && month<=12) ? lookup[month] : lookup[0] );
- }
- else
- _retc(_tr_errmsgs(funcname, E_SYNTAX)); /* syntax error */
- return; /* return from program */
- }
- /* eof */
-