allelomorph/printf

A simple clone of the glibc `printf`. See project (228) 0x11. C - printf from repository `holbertonschool-low_level_programming`.

Notes

• This project, also known as (228) 0x11. C - printf, was created in a repository separate from holbertonschool-low_level_programming, where the other projects from this section are located.
• What follows is the original README submitted for the project.

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0x11. C - printf

Description

• _printf() produces output according to a format and writes output to stdout, the standard output stream.
• Upon successful return, _printf() returns the number of characters printed (excluding the null byte used to end output to strings).
  • If an output error is encountered, a negative value is returned.
• The format string is a character string and is composed of zero or more directives:
  • ordinary characters (not %), which are copied unchanged to the output stream
  • conversion specifications, each of which results in fetching zero or more subsequent arguments. Each conversion specification is introduced by the character %

Flag Characters / Conversion Specifiers

The character % is followed by zero or more of the following flags:

b

• The unsigned int argument is written in binary.

c

• The int argument is converted to an unsigned char, and the resulting character is written.

d, i

• The int argument is converted to signed decimal notation. The default precision is 1.

o

• The unsigned int argument is written in octal format.

%

• The percent character is escaped by itself, as with %.

p

• The long unsigned int argument is converted to hex to be written as a pointer.

R

• The const char * argument is written in rot13 encoding.

r

• The const char * argument is written backwards.

s

*The const char * argument is expected to be a pointer to an array of character type (pointer to a string). Characters from the array are written up to (but not including) a terminating null byte ('\0')

u

• The unsigned int argument is written in base 10 format.

x

• The unsigned int argument is written in lowercase hex format.

X

• The unsigned int argument is written in uppercase hex format.

Example

'_printf("String:[%s]\n", "I am a string !");'

Result:

String: [I am a string!]

'_printf("Number:[%d]\n", "1234567");'

Result:

Number:[1234567]

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Files:

_printf.c

• This file contains the meat of our printf() function. We initialize our data type struct, check to edge cases, and loop trough the format string returning the corresponding result.

mand_helpers.c

• This file contains our helper functions basic printf() functionality. Helpers include: _printchar, _printstr, _printnum, and _printp

holberton.h

• This file contains all our function prototypes, a declaration of our data type struct, and some standard libraries

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Authors

• Andrew Cox - AndrewC7
• Samuel Pomeroy - allelomorph
• Sam Messenger - SamMessenger