MalibC (discontinued)

A super lightweight C standard library implementation for x86-64 Linux systems was designed for manipulating PC motherboard firmware, but the project was discontinued. (The author of the assembly(CRt0.s) file is another person)

Features

• Core functionality:

  • Memory allocation (malloc/free)
  • Standard I/O (printf/putchar)
  • File operations (fopen/fread/fclose)
  • System call wrappers

• Minimal footprint:

  • Static 1MB heap
  • No buffered I/O
  • ~50KB binary size

• Compatibility:

  • x86-64 Linux (System V ABI)
  • Partial ANSI C89 support
  • GNU extension stubs

Quick start

./build.sh

# Run examples
./hello
./filetest

API reference

See detailed documentation:

• API.md - Library functions
• syscalls.md - Low-level interfaces

Limitations

❌ No dynamic linking
❌ No thread safety
❌ Limited error handling
❌ No floating point support

Example usage

#include <stdio.h>

int main() {
    printf("malibc version: %s\n", get_libc_version());
    
    FILE* f = fopen("test.txt", "r");
    if (f) {
        char buf[100];
        size_t n = fread(buf, 1, sizeof(buf), f);
        printf("Read %zu bytes\n", n);
        fclose(f);
    }
    return 0;
}