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ft_dprintf

It is library that contains ft_dprintf, a function that will mimic the original dprintf.

Description

ft_dprintf interprets the following format rules.

%[flags][minimum field width].[precision][conversion specifier]

  • Flags : '-', '0', '#', ' ', '+'

    • '-' : Left justified.
    • '0' : Zero padding.
    • '#' : Alternate form.
    • ' ' : Negative field width flag.
    • '+' : Negative field width flag.

  • Conversion specifier : 'c', 's', 'p', 'd', 'i', 'u', 'x', 'X', '%'

    • %c : Prints a single character.
    • %s : Prints a string.
    • %p : The void * pointer argument has to be printed in hexadecimal format.
    • %d : Prints a decimal (base 10) number.
    • %i : Prints an integer in base 10.
    • %u : Prints an unsigned decimal (base 10) number.
    • %x : Prints a number in hexadecimal (base 16) lowercase format.
    • %X : Prints a number in hexadecimal (base 16) uppercase format.
    • %% : Prints a percent sign.

Usage

Compile and use as below.

$ make
$ gcc -Wall -Wextra -Werror <file_name> -I<include_paths> -L<library_path> -lftdprintf
$ ./a.out

ft_dprintf can be used in the same way as dprintf as shown below.

/* Use ft_dprintf */
ft_dprintf(1, "/* Output */\n");
ft_dprintf(1, "<%c>\n", 'A');
ft_dprintf(1, "<%s>\n", "Hello World!!!");
ft_dprintf(1, "<%d>\n", 42);
ft_dprintf(1, "<%x>\n", 123456789);
ft_dprintf(1, "<%%>\n");
/* Output */
<A>
<Hello World!!!>
<42>
<75bcd15>
<%>

Example

Include ft_dprintf.h and compile your code with libftdprintf.a.

/* main.c */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "ft_dprintf.h"

int main(void)
{
  int fd;
  
  fd = open("ret.txt", O_WRONLY);
  if (fd == -1)
  {
    ft_dprintf(2, "File open error.\n");
    return (1);
  }
  ft_dprintf(fd, "<%10.5d>, <%010d>\n", 42, 42);
  ft_dprintf(fd, "<%+d>, <% d>\n", 42, 42);
  ft_dprintf(fd, "<%-10x>, <%#10x>\n", 42, 42);
  close(fd);
  return (0);
}
$ make
$ gcc -Wall -Wextra -Werror main.c -Ilibft/includes -Iincludes -Llib -lftdprintf
$ ./a.out

The following is output to ret.txt.

<     00042>, <0000000042>
<+42>, < 42>
<2a        >, <      0x2a>