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#include <stdarg.h>
#include <stdbool.h>
#include <ctype.h>
#include <kogata/debug.h>
#include <kogata/printf.h>
int snprintf(char * buff, size_t len, const char *format, ...) {
va_list ap;
va_start(ap, format);
len = vsnprintf(buff, len, format, ap);
va_end(ap);
return len;
}
struct vsnprintf_s {
char* buff;
size_t len;
size_t i;
};
int vsnprintf_putc_fun(int c, void* p) {
struct vsnprintf_s *s = (struct vsnprintf_s*)p;
if (s->i < s->len - 1) {
s->buff[s->i] = c;
s->i++;
return 1;
} else {
return 0;
}
}
int vsnprintf(char *buff, size_t len, const char* format, va_list arg){
if (!buff || !format)
return -1;
struct vsnprintf_s s;
s.buff = buff;
s.len = len;
s.i = 0;
size_t ret = vcprintf(vsnprintf_putc_fun, &s, format, arg);
ASSERT(ret == s.i);
buff[s.i] = 0;
return s.i;
}
int vcprintf(int (*putc_fun)(int c, void* p), void* p, const char* format, va_list ap) {
if (!format) return -1;
int ret = 0;
#define PUTCHAR(thechar) { int _tmp = putc_fun(thechar, p);\
if (_tmp == 1) ret++; \
else if (_tmp == 0) return ret; \
else if (_tmp < 0) return _tmp; }
size_t i;
for(i = 0; format[i] != '\0' ; i++) {
if (format[i] == '%') {
i++;
int na = -1;
int nb = -1;
int u = 0;
int l = 0;
bool dotspec = false;
bool spec = true;
while (spec) {
if (format[i] == 'l') {
l++;
i++;
} else if (format[i] == 'u') {
u = 1;
i++;
} else if (isdigit(format[i])) {
if (dotspec) {
if (nb == -1) nb = 0;
nb = nb * 10 + (format[i] - '0');
} else {
if (na == -1) na = 0;
na = na * 10 + (format[i] - '0');
}
i++;
} else if (format[i] == '.') {
dotspec = true;
i++;
} else {
spec = false;
}
}
if (format[i] == '%') {
PUTCHAR('%');
} else if (format[i] == 'i' || format[i] == 'd') {
if (u) {
// TODO
} else {
long long int integer;
if (l == 0) integer = va_arg(ap, int);
if (l == 1) integer = va_arg(ap, long int);
if (l == 2) integer = va_arg(ap, long long int);
int cpt2 = 0;
char buff_int[32];
if (integer<0) {
PUTCHAR('-');
}
do {
int m10 = integer%10;
m10 = (m10 < 0)? -m10:m10;
buff_int[cpt2++] = (char)('0'+ m10);
integer = integer/10;
} while(integer != 0);
for(cpt2 = cpt2 - 1; cpt2 >= 0; cpt2--)
PUTCHAR(buff_int[cpt2]);
}
} else if (format[i] == 'c') {
int value = va_arg(ap,int);
PUTCHAR((char)value);
break;
} else if (format[i] == 's') {
char *string = va_arg(ap,char *);
if (!string)
string = "(null)";
for(; *string != '\0' ; string++)
PUTCHAR(*string);
} else if (format[i] == 'x') {
unsigned long long int hexa;
if (l == 0) hexa = va_arg(ap, unsigned int);
if (l == 1) hexa = va_arg(ap, unsigned long int);
if (l == 2) hexa = va_arg(ap, unsigned long long int);
int had_nonzero = 0;
for(int j = 0; j < 8; j++) {
unsigned int nb = (unsigned int)(hexa << (j*4));
nb = (nb >> 28) & 0xf;
// Skip the leading zeros
if (nb == 0) {
if (had_nonzero) {
PUTCHAR('0');
}
} else {
had_nonzero = 1;
if (nb < 10) {
PUTCHAR('0'+nb);
} else {
PUTCHAR('a'+(nb-10));
}
}
}
if (!had_nonzero) {
PUTCHAR('0');
}
} else if (format[i] == 'p') {
unsigned int hexa = va_arg(ap,int);
for (int j = 0; j < 8; j++) {
unsigned int nb = (unsigned int)(hexa << (j*4));
nb = (nb >> 28) & 0xf;
if (nb < 10) {
PUTCHAR('0'+nb);
} else {
PUTCHAR('a'+(nb-10));
}
}
} else {
PUTCHAR('%');
PUTCHAR(format[i]);
}
} else {
PUTCHAR(format[i]);
}
}
return ret;
}
/* vim: set ts=4 sw=4 tw=0 noet :*/
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