92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
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#include "types.h"
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#include "stat.h"
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#include "user.h"
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static void putc(int fd, char c) {
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write(fd, &c, 1);
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}
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static void printint(int fd, int xx, int base, int sgn) {
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static char digits[] = "0123456789ABCDEF";
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char buf[16];
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int i, neg;
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uint 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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}
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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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}
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while ((x /= base) != 0);
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if (neg) {
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buf[i++] = '-';
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}
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while (--i >= 0) {
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putc(fd, buf[i]);
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}
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}
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// Print to the given fd. Only understands %d, %x, %p, %s.
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void printf(int fd, const char *fmt, ...) {
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char *s;
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int c, i, state;
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uint *ap;
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state = 0;
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ap = (uint*)(void*)&fmt + 1;
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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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}
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else {
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putc(fd, c);
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}
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}
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else if (state == '%') {
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if (c == 'd') {
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printint(fd, *ap, 10, 1);
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ap++;
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}
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else if (c == 'x' || c == 'p') {
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printint(fd, *ap, 16, 0);
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ap++;
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}
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else if (c == 's') {
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s = (char*)*ap;
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ap++;
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if (s == 0) {
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s = "(null)";
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}
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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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}
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else if (c == 'c') {
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putc(fd, *ap);
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ap++;
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}
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else if (c == '%') {
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putc(fd, c);
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}
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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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