lowcase.c

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/***********************************************************************
 *
 *     This subroutine converts uppercase letters in INSTR to lowercase.
 *
 *     B.D.Schieber, GSC, 3/94
 *
 ************************************************************************/
#include <ctype.h>
 
char *lowcase(char *instr) {
    char *strptr = instr;
 
    while (*instr != '\0') {
        if (isupper(*instr)) *instr = tolower(*instr);
        instr++;
    }
 
    return (strptr);
}