source: buchla-68k/iolib/sprintf.c

/*
   =============================================================================
        sprintf.c -- sprintf function
        Version 2 -- 1987-06-11 -- D.N. Lynx Crowe
   =============================================================================
*/

#include "ram.h"

static int8_t   *buff;
static int16_t spsub(int16_t c);

/*
   =============================================================================
        sprintf(str, fmt, args) -- format args into str according to fmt
   =============================================================================
*/

int16_t sprintf(int8_t *str, int8_t *fmt, ...)
{
        register int16_t count;
        va_list aptr;

        buff = str;
        va_start(aptr, fmt);
        count = dofmt_(spsub, fmt, aptr);
        va_end(aptr);
        *buff = '\0';
        return(count);
}

/*
   =============================================================================
        spsub(c) - put c into the output string
   =============================================================================
*/

static int16_t spsub(int16_t c)
{
        return((*buff++ = (int8_t)c) & 0xFF);
}