CASE STUDY · 1337 / 42 validated project
ft_printf
A C implementation of core `printf()` behavior using variadic arguments and format dispatch.
- Role
- 1337 / 42 Developer
- Access
- 1337 / 42 validated project
Context
A C implementation of core `printf()` behavior using variadic arguments and format dispatch. It supports character, string, pointer, decimal, unsigned, and hexadecimal conversions with explicit edge-case handling.
My responsibility
Built and validated through the 1337 / 42 project curriculum, with direct responsibility for implementation, debugging, testing, and evaluation requirements.
System scheme
Engineering scheme
Variadic format dispatch
The formatter parses each conversion token, dispatches to a type-specific writer, and returns the exact emitted character count.
- 01
Format string
Scan literal characters and conversion markers.
- 02
Token parser
Identify the requested conversion type.
- 03
Variadic argument
Read the matching promoted value from `va_list`.
- 04
Type formatter
Convert strings, numbers, pointers, and hexadecimal values.
- 05
Output writer
Write formatted bytes without relying on standard printf.
- 06
Count result
Track and return the total number of emitted characters.
Technical scope
Implementation details
- ✓Format string: Scan literal characters and conversion markers.
- ✓Token parser: Identify the requested conversion type.
- ✓Variadic argument: Read the matching promoted value from `va_list`.
- ✓Type formatter: Convert strings, numbers, pointers, and hexadecimal values.
- ✓Output writer: Write formatted bytes without relying on standard printf.
- ✓Count result: Track and return the total number of emitted characters.
Engineering focus
- →Variadic types remained an explicit concern across the implementation.
- →Base conversion remained an explicit concern across the implementation.
- →Null handling remained an explicit concern across the implementation.
- →Return semantics remained an explicit concern across the implementation.
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