ft_printf

About this printf

This printf is malloc-free and use a buffer to reduce his system calls to write.
It use global conversion table to direcly apply the right conversion function, No else if required.

Structs & Buffer

The buffer is allocated in the stack and it uses less than 3kb.
t_data is my env, it hold :

idx     : current index for the buffer.
carry   : Return value of the printf, everytime we write to stdout it add the idx value to the carry.
conf    : Conf generate everytime there is a %. It store all the padding and such parameters. More on that below.
buff    : Char buffer where the conversion function write.
tmp     : temp buffer for itob functions (before padding for ex).

t_config is generated by format_parser, It built when there is stuff between the '%' and the conversion, it hold:

conv    : Conversion char (for debug).
flags   : Bitwise flags (see [ft_printf.h](includes/ft_printf.h). for more)
space   : Space count
prec    : Precision
width   :
rpad    : Right padding
zpad    : Zero padding

README#L18

g_conv g_mod

It use a conversion table g_conv define in ft_conv.h. It is a array of function pointer that return the number of char written into the buffer.
The conversion and the call to the g_conv is in ft_process : f_unkn is a dummy function to still know that if :

g_conv[(int)c] != NULL

then c is a conversion.
g_mod is only uses to check if this is a valid modifier char.

Functions:

itob or ulltob are like itoa but they don't allocate they write into a buffer.
All the form_*.c are conversion functions in the table g_conv.

Makefile

make curqui

Rebuilt the project and run curqui test on it. It will create a folder on the parent directory of the makefile for the curci repo.

make run

Rebuilt the project and run test.c. This is a detail output for the current work cases.

To do :

Current test results:

Basic test	=	56/182		Fails
undefined	=	37/55		Fails
moulitest	=	(timeout)
PFT			=	393/694		Pass
Curqui		=	110/233		Pass

	Basic tests          2/2
	Conv d-i-D           35/40
	Conv u-U             0/26
	Conv o-O             13/34
	Conv x-X             13/39
	Conv c               8/8
	Conv C               1/22
	Conv s               15/15
	Conv S               4/23
	Conv p               7/7
	Percent              12/12
	Mixed tests          1/5
	----------------------------
	TOTAL                111/233
	----------------------------

Notes:

Modifier          d, i           o, u, x, X
hh                signed char    unsigned char
h                 short          unsigned short
l (ell)           long           unsigned long
ll (ell ell)      long long      unsigned long long

Modifier    a, A, e, E, f, F, g, G
l (ell)     double (ignored, same behavior as without it)
L           long double

All the types

unsigned char
signed char
unsigned short
short
unsigned long
long
unsigned long long
long long
double
long double

Name ideas from the GNU LIBC printf

flag_space			/* for ' ' */
flag_plus			/* for '+' */
flag_minus			/* for '-' */
flag_hash			/* for '#' */
flag_zero			/* for '0' */

width_asterics		/* for '*' */
width				/* for '1'...'9' */
precision			/* for '.' */

mod_half			/* for 'h' */
mod_halfhalf
mod_long			/* for 'l' */
mod_longlong

nihuynh/ft_printf