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#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
typedef struct
{
int precision;
int width;
char specifier;
} t_format_spec;
void ft_putchar(char c)
{
write(STDOUT_FILENO, &c, 1);
}
int ft_strlen(char *s)
{
int c;
c = 0;
while (s[c])
c++;
return (c);
}
void ft_putstr(char *s)
{
write(STDOUT_FILENO, s, ft_strlen(s));
}
int ft_isdigit(char c)
{
return (c >= '0' && c <= '9');
}
int ft_atoi_skip(char **s)
{
int nb;
int is_neg;
is_neg = **s == '-';
nb = 0;
while (ft_isdigit(**s))
{
nb *= 10;
nb += **s - '0';
(*s)++;
}
return (is_neg ? -nb : nb);
}
char *parse(char *format, t_format_spec *spec)
{
int tmp;
if (ft_isdigit(*format))
tmp = ft_atoi_skip(&format);
if (*format == '.')
{
spec->precision = tmp;
if (ft_isdigit(*++format))
spec->width = ft_atoi_skip(&format);
}
else
spec->width = tmp;
if (*format != 's' && *format != 'd' && *format != 'x')
return (NULL);
spec->specifier = *format++;
return (format);
}
int count_digits(int nb, int radix)
{
int counter;
counter = nb < 0 ? 1 : 0;
while (nb > 0)
{
nb /= radix;
counter++;
}
return (counter);
}
char *ft_itoa_base(int nb, char *base)
{
int len;
int radix;
char *s;
radix = ft_strlen(base);
len = count_digits(nb, radix);
if ((s = (char*)malloc(sizeof(char) * (len + 1))) == NULL)
return (NULL);
s[len] = 0;
if (nb < 0)
s[0] = '-';
while (--len >= (nb < 0 ? 1 : 0))
{
s[len] = base[nb % radix];
nb /= radix;
}
return (s);
}
int handle_s(va_list ap, t_format_spec *spec)
{
char *tmp;
tmp = va_arg(ap, char*);
ft_putstr(tmp);
return (ft_strlen(tmp));
}
int handle_d(va_list ap, t_format_spec *spec)
{
int tmp;
char *s;
tmp = va_arg(ap, int);
s = ft_itoa_base(tmp, "0123456789");
ft_putstr(s);
return ft_strlen(s);
}
int handle_x(va_list ap, t_format_spec *spec)
{
int tmp;
char *s;
tmp = va_arg(ap, int);
s = ft_itoa_base(tmp, "0123456789abcdef");
ft_putstr(s);
return ft_strlen(s);
}
int print_spec(va_list ap, t_format_spec *spec)
{
if (spec->specifier == 's')
return (handle_s(ap, spec));
else if (spec->specifier == 'd')
return (handle_d(ap, spec));
else if (spec->specifier == 'x')
return (handle_x(ap, spec));
else
return (-1);
}
int ft_printf(char *format, ...)
{
va_list ap;
int counter;
t_format_spec spec;
va_start(ap, format);
counter = 0;
while (*format)
{
if (*format == '%')
{
if ((format = parse(format + 1, &spec)) == NULL)
return (-1);
counter += print_spec(ap, &spec);
}
else
{
ft_putchar(*format++);
counter++;
}
}
va_end(ap);
return (counter);
}
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