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#include <assert.h>
#include <log.h>
#include <stdio.h>
#include <string.h>
#define TAB_SIZE 8
inline void putc(const char c) {
log_char(c);
}
void put_string(const char *s, int l) {
for (; l > 0; l--, s++) {
log_char(*s);
}
}
#define WRITE(_s, _l, _r) \
{ \
put_string(_s, _l); \
*(int *)(_r) += _l; \
}
int print_num(long long n, int base, char *char_set, int prefix,
int zero_padding, int right_padding) {
int c = 0;
char str[32];
int i = 0;
int is_signed = 0;
if (n < 0) {
is_signed = 1;
n *= -1;
}
if (0 == n) {
str[i] = char_set[0];
i++;
} else {
for (; n != 0 && i < 32; i++, n /= base) {
str[i] = char_set[(n % base)];
}
}
if (is_signed) {
str[i] = '-';
i++;
}
char t = (zero_padding) ? '0' : ' ';
int orig_i = i;
if (!right_padding) {
for (; prefix - orig_i > 0; prefix--) {
WRITE(&t, 1, &c);
}
}
for (i--; i >= 0; i--) {
WRITE(&(str[i]), 1, &c);
}
if (right_padding) {
for (; prefix - orig_i > 0; prefix--) {
WRITE(&t, 1, &c);
}
}
return c;
}
int print_int(long long n, int prefix, int zero_padding, int right_padding) {
return print_num(n, 10, "0123456789", prefix, zero_padding, right_padding);
}
int print_hex(long long n, int prefix, int zero_padding, int right_padding) {
return print_num(n, 16, "0123456789abcdef", prefix, zero_padding,
right_padding);
}
int print_octal(long long n, int prefix, int zero_padding, int right_padding) {
return print_num(n, 8, "012345678", prefix, zero_padding, right_padding);
}
int print_string(const char *s, int *rc, int prefix, int right_padding,
int precision) {
int l = strlen(s);
char t = ' ';
int c = 0;
if (!right_padding) {
if (prefix) {
assert(-1 == precision); // FIXME: Is this correct?
}
for (; prefix - l > 0; prefix--) {
WRITE(&t, 1, &c);
}
}
int bl = precision;
for (; *s; s++, (*rc)++) {
if (precision != -1) {
if (0 == bl) {
break;
}
bl--;
}
int r = 0;
WRITE((const unsigned char *)s, 1, &r);
}
if (right_padding) {
assert(-1 == precision); // FIXME: Is this correct?
for (; prefix - l > 0; prefix--) {
WRITE(&t, 1, &c);
}
}
(*rc) += c;
return 0;
}
int parse_precision(const char **fmt) {
const char *s = *fmt;
int rc = 0;
for (int i = 0;; i++, s++) {
if ('\0' == *s) {
break;
}
const char c = *s;
if ('*' == c) {
assert(i == 0);
return -1;
} else if (!(c >= '0' && c <= '9')) {
s--;
break;
}
rc *= 10;
rc += c - '0';
}
*fmt = s;
return rc;
}
int vkprintf(const char *fmt, va_list ap) {
int rc = 0;
const char *s = fmt;
int prefix = 0;
int long_level = 0;
int zero_padding = 0;
int right_padding = 0;
int cont = 0;
int precision = -1;
for (; *s; s++) {
if (!cont && '%' != *s) {
WRITE((const unsigned char *)s, 1, &rc);
continue;
}
if (!cont) {
cont = 1;
continue;
}
if ('\0' == *s) {
break;
}
switch (*s) {
case '.':
s++;
assert('\0' != *s);
precision = parse_precision(&s);
assert('\0' != *s);
if (-1 == precision) {
precision = va_arg(ap, int);
}
cont = 1;
break;
case '0':
prefix *= 10;
if (0 == prefix) {
zero_padding = 1;
}
cont = 1;
break;
case '-':
assert(0 == prefix);
right_padding = 1;
cont = 1;
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
prefix *= 10;
prefix += (*s) - '0';
cont = 1;
break;
case 'l':
long_level++;
assert(long_level <= 2);
break;
case 'i':
case 'd':
if (-1 != precision) {
zero_padding = 1;
prefix = precision;
right_padding = 0;
}
if (2 == long_level) {
rc += print_int(va_arg(ap, long long), prefix, zero_padding,
right_padding);
} else if (1 == long_level) {
rc += print_int(va_arg(ap, long long), prefix, zero_padding,
right_padding);
} else {
rc += print_int(va_arg(ap, int), prefix, zero_padding, right_padding);
}
long_level = 0;
cont = 0;
break;
case 'u':
assert(-1 == precision);
rc += print_int(va_arg(ap, unsigned int), prefix, zero_padding,
right_padding);
cont = 0;
break;
case 's': {
assert(!zero_padding); // this is not supported to strings
char *a = va_arg(ap, char *);
if (!a) {
if (-1 ==
print_string("(NULL)", &rc, prefix, right_padding, precision)) {
return -1;
}
cont = 0;
break;
}
if (-1 == print_string(a, &rc, prefix, right_padding, precision)) {
return -1;
}
cont = 0;
break;
}
case 'p': // TODO: Print this out in a nicer way
case 'x':
assert(-1 == precision);
rc +=
print_hex(va_arg(ap, const u32), prefix, zero_padding, right_padding);
cont = 0;
break;
case 'o':
assert(-1 == precision);
rc += print_octal(va_arg(ap, const u32), prefix, zero_padding,
right_padding);
cont = 0;
break;
case '%': {
WRITE((const unsigned char *)"%", 1, &rc);
cont = 0;
break;
}
case 'c': {
char c = va_arg(ap, const int);
WRITE((const unsigned char *)&c, 1, &rc);
cont = 0;
break;
}
default:
kprintf("got %c but that is not supported by printf\n", *s);
assert(0);
break;
}
if (!cont) {
prefix = 0;
zero_padding = right_padding = 0;
precision = -1;
}
}
return rc;
}
int kprintf(const char *format, ...) {
va_list list;
va_start(list, format);
int rc = vkprintf(format, list);
va_end(list);
return rc;
}
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