A custom made printf function built in C using only the write, malloc, free, va_start, va_copy, va__arg, and va_end non custom functions.
The custom printf function is called using _printf() and will take in a format string, followed by an optional comma and argument list.
int _printf(const char *format, ...);
This is the prototype for our custom printf and will return the number of chararacters printed or in the case of a percentage sign at the end of a string, -1. A percentage sign and a specific conversion specifier in our format string will indicate a special print within the format string when matched with a corresponding provided argument.
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Ubuntu 14.04 LTS - Operating system required.
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GCC 4.8.4 - Compiler used
Clone the repository into a new directory:
$ git clone https://github.com/sebaslherrera/printf
Create a main file and include the header holberton.h:
Example main.c:
#include "holberton.h"
int main(void)
{
_printf("Hello, World!");
return (0);
}
Compile with the following:
$ gcc *.c -o main
Finally, run:
$ ./main
Hello, World!
$
The available convertion specifiers are:
-
%c: Prints a single character.
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%s: Prints a string of characters.
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%d: Prints integers.
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%i: Prints integers.
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%b: Prints the binary representation of a decimal.
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%u: Prints unsigned integers
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%x: Prints the hexadecimal representation of an unsigned decimal in lowercase letters
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%X:Prints the hexadecimal representation of an unsigned decimal in uppercase letters
- Sebastian Lopez <sebaslherrera>
- Joan Sebastian Garcia <Noah172>
This project is licensed under the MIT License
The _printf function emulates functionality of the C standard library
function printf. This README borrows from the Linux man page
printf(3).