42_INT_03_ft_printf/ft_printf.c

#include <libc.h>
#include <stdarg.h>

int		ft_printf(char *fmt, ...)
{
	va_list	ap;
	int		d;
	char	c, *s;

	va_start(ap, fmt);
	while (*fmt)
		switch(*fmt++) {
			case 's':                       /* string */
				s = va_arg(ap, char *);
				printf("string %s\n", s);
				break;
			case 'd':                       /* int */
				d = va_arg(ap, int);
				printf("int %d\n", d);
				break;
			case 'c':                       /* char */
				/* Note: char is promoted to int. */
				c = va_arg(ap, int);
				printf("char %c\n", c);
				break;
		}
	va_end(ap);
	return (0);
}

int		main(void)
{
	char	*s;
	char	*str;
	char	c;
	int		i;

	s = "scd";
	str = "bravo";
	c = 'c';
	i = 6;
	ft_printf(s, str, c, i);

	//	ft_printf("[simple str sans newline]");
	       printf(" simple str sans newline ");
	//	ft_printf("[simple str avec newline]\n");
	       printf(" simple str avec newline \n");
	//	ft_printf("[impression d'un %%]\n");
	       printf(" impression d'un %% \n");
	//	ft_printf("[%%c      : %c]\n", 'c');
	       printf(" %%c      : %c \n", 'c');
	//	ft_printf("[%%s      : %s]\n", "string");
	       printf(" %%s      : %s \n", "string");
	//	ft_printf("[%%p      : %p]\n", str);
	       printf(" %%p      : %p \n", str);
	//	ft_printf("[%%d      : %d]\n", 456);
	       printf(" %%d      : %d \n", 456);
	//	ft_printf("[%%i      : %i]\n", 846);
		   printf(" %%i      : %i \n", 846);
	//	ft_printf("[%%u      : %u]\n", 87);
		   printf(" %%u      : %u \n", 87);
	//	ft_printf("[%%u (neg): %u]\n", -87);
		   printf(" %%u (neg): %u \n", -87);
	//	ft_printf("[%%x (78) : %x]\n", 78);
		   printf(" %%x (78) : %x \n", 78);
	//	ft_printf("[%%X (78) : %X]\n", 78);
		   printf(" %%X (78) : %X \n", 78);

//		printf("\nBONUS:\n");
//	//	ft_printf("%n\n", );
//		   printf("%n\n", );
//	//	ft_printf("%f\n", );
//		   printf("%f\n", );
//	//	ft_printf("%g\n", );
//		   printf("%g\n", );
//	//	ft_printf("%e\n", );
//		   printf("%e\n", );

//		printf("\nADD:\n");
//	//	ft_printf("%E\n", );
//		   printf("%E\n", );
//	//	ft_printf("%G\n", );
//		   printf("%G\n", );
//	//	ft_printf("%o\n", );
//		   printf("%o\n", );
	return (0);
}

	//	usage :
	//	%[flags][width][.precision][length]specifier
	//
	//	[specifiers]
	//	c		character
	//	s		string of characters
	//	p		pointer adress
	//	d		(or i) signed decimal integer
	//	i		(or d) signed decimal integer
	//	u		unsigned decimal integer
	//	x		unsigned hexadecimal integer
	//	X		unsigned hexadecimal integer (capital letters)
	//(	n		nothing printed
	//(	f		decimal floating point
	//(	g		uses the shorter of %e or %f
	//(	e		scientific notation (mantissa/exponent) using e
	//((E		scientific notation (mantissa/exponent) using E
	//((G		uses the shorter of %E or %f
	//((o		signed octal
	//
	//	[flags]
	//	-		left-justify within the given field width
	//	0		left-pads the number with zeroes (0) instead of spaces, where
	//			padding is specified (see width sub-specifier)
	//(	+		forces to precede the result with a plus or minus sign even for
	//			positive numbers)
	//(	(space)	if no sign is going to be written, a blank space is inserted
	//			before the value)
	//(	#		used with o, x or X specifiers the value is preceded with 0, 0x
	//			or 0X respectively for values different than zero. Used with e,
	//			E and f, it forces the written output to contain a decimal point
	//			even if no digits would follow. By default, if no digits follow,
	//			no decimal point is written. Used with g or G the reult is the
	//			same as with e or E but trailing zeros are not removed)
	//
	//	[width]
	//	(nbr)	minimum number of characters to be printed. if the value to be
	//			printed is shorter than this number, the result is padded with
	//			blank spaces. The value is not truncated even if the result is
	//			larger
	//	*		the width is not specified in the format string, but as an
	//			additional integer value arguement preceding the argument that
	//			has to be formatted
	//
	//	[.precision]
	//	.nbr	fot integer specifiers (d,i,o,x,X) - precision specifies the
	//			minimum number of digits to be written. If the value to be
	//			written is shorter than this number, the result is padded with
	//			leading zeros. The value is not truncated even if the result is
	//			longer. A precision of 0 means that no character is written for
	//			the value 0. For e, E and f specifiers − this is the number of
	//			digits to be printed after the decimal point. For g and G
	//			specifiers − This is the maximum number of significant digits
	//			to be printed. For s − this is the maximum number of characters
	//			to be printed. By default all characters are printed until the
	//			ending null character is encountered. For c type − it has no
	//			effect. When no precision is specified, the default is 1. If the
	//			period is specified without an explicit value for precision, 0
	//			is assumed
	//	.*		the precision is not specified in the format string, but as an
	//			additional integer value argument preceding the argument that
	//			has to be formated
	//