← C17 MOC · 🎯 Mission · Standard I/O Reference
LR-0004: Standard I/O Return Conventions & fread Parameters
Clarified low-level C standard I/O semantics: fseek uses the Unix status return convention where 0 indicates success and non-zero indicates error. fread parameter separation (size of single element vs nmemb count) enables structured record-based reading where the return value represents the count of complete records transferred rather than raw bytes.
🔍 Evidence
- Investigated
fseekreturn guarantees (!= 0) and decomposed the 4 parameters offreadfor both raw byte buffers and structured record arrays. - Corroborated with Defensive Programming Invariants to avoid silent stream errors.
🚀 Implications for Curriculum
- Documented canonical rules in Standard I/O Reference.
- Applied directly in Lesson 0002: Safe Binary File I/O & ROM Loading into Memory at 0x200.
- Solid foundation set for binary file parsing and memory buffer manipulation in CHIP-8 Emulation.