114 lines
2 KiB
C
114 lines
2 KiB
C
#include "kernel/types.h"
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#include "kernel/stat.h"
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#include "user/user.h"
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#include <stdarg.h>
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static char digits[] = "0123456789ABCDEF";
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static void
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putc(int fd, char c)
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{
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write(fd, &c, 1);
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}
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static void
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printint(int fd, int xx, int base, int sgn)
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{
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char buf[16];
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int i, neg;
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u32 x;
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neg = 0;
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if(sgn && xx < 0) {
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neg = 1;
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x = -xx;
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} else {
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x = xx;
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}
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i = 0;
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do {
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buf[i++] = digits[x % base];
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} while((x /= base) != 0);
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if(neg)
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buf[i++] = '-';
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while(--i >= 0)
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putc(fd, buf[i]);
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}
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static void
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printptr(int fd, u64 x)
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{
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int i;
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putc(fd, '0');
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putc(fd, 'x');
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for(i = 0; i < (sizeof(u64) * 2); i++, x <<= 4)
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putc(fd, digits[x >> (sizeof(u64) * 8 - 4)]);
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}
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// Print to the given fd. Only understands %d, %x, %p, %s.
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void
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vprintf(int fd, const char *fmt, va_list ap)
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{
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char *s;
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int c, i, state;
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state = 0;
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for(i = 0; fmt[i]; i++) {
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c = fmt[i] & 0xff;
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if(state == 0) {
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if(c == '%') {
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state = '%';
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} else {
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putc(fd, c);
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}
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} else if(state == '%') {
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if(c == 'd') {
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printint(fd, va_arg(ap, int), 10, 1);
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} else if(c == 'l') {
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printint(fd, va_arg(ap, u64), 10, 0);
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} else if(c == 'x') {
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printint(fd, va_arg(ap, int), 16, 0);
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} else if(c == 'p') {
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printptr(fd, va_arg(ap, u64));
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} else if(c == 's') {
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s = va_arg(ap, char *);
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if(s == 0)
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s = "(null)";
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while(*s != 0) {
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putc(fd, *s);
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s++;
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}
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} else if(c == 'c') {
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putc(fd, va_arg(ap, u32));
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} else if(c == '%') {
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putc(fd, c);
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} else {
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// Unknown % sequence. Print it to draw attention.
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putc(fd, '%');
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putc(fd, c);
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}
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state = 0;
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}
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}
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}
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void
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fprintf(int fd, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vprintf(fd, fmt, ap);
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}
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void
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printf(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vprintf(1, fmt, ap);
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}
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