90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
/** Simple printf implementation
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Again a stub - will use the std one later...
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#define STATIC
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/* PENDING */
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#define NULL 0
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STATIC void _printn(unsigned u, unsigned base, char issigned, void (*emitter)(char, void *), void *pData)
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{
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const char *_hex = "0123456789ABCDEF";
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if (issigned && ((int)u < 0)) {
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(*emitter)('-', pData);
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u = (unsigned)-((int)u);
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}
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if (u >= base)
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_printn(u/base, base, 0, emitter, pData);
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(*emitter)(_hex[u%base], pData);
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}
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STATIC void _printf(const char *format, void (*emitter)(char, void *), void *pData, va_list va)
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{
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while (*format) {
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if (*format == '%') {
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switch (*++format) {
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case 'c': {
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char c = (char)va_arg(va, int);
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(*emitter)(c, pData);
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break;
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}
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case 'u':
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{
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unsigned u = va_arg(va, unsigned);
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_printn(u, 10, 0, emitter, pData);
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break;
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}
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case 'd':
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{
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unsigned u = va_arg(va, unsigned);
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_printn(u, 10, 1, emitter, pData);
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break;
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}
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case 'x':
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{
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unsigned u = va_arg(va, unsigned);
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_printn(u, 16, 0, emitter, pData);
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break;
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}
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case 's':
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{
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char *s = va_arg(va, char *);
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while (*s) {
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(*emitter)(*s, pData);
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s++;
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}
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}
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}
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}
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else {
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(*emitter)(*format, pData);
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}
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format++;
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}
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}
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void putchar(char c);
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STATIC void _char_emitter(char c, void *pData)
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{
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/* PENDING: Make the compiler happy. */
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pData = 0;
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putchar(c);
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}
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int printf(const char *format, ...)
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{
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va_list va;
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va_start(va, format);
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_printf(format, _char_emitter, NULL, va);
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/* PENDING: What to return? */
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return 0;
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}
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