CgeStr - Unicode String Library for C

A lightweight, dependency-free C library for UTF-8 string processing with full Unicode support.

Features

• UTF-8 encoding and decoding
• UTF-16 encoding and decoding
• Unicode case mapping: lowercase, uppercase, titlecase, case folding
• Full case mapping functions returning multiple runes when needed
• Character classification: isControl, isDigit, isLetter, isSpace, and others
• Unicode category lookup via CgeRuneCategory
• Case-sensitive and case-insensitive string comparison
• Substring and rune search
• Prefix and suffix checking
• String trimming (left, right, both)
• String splitting by rune
• Iteration over Unicode code points using callback interface

Build Systems

• CMake - supports Linux, macOS, Windows (MSVC, MinGW)
• Makefile.posix - for GCC/Clang on POSIX systems
• Makefile.mingw - for MinGW on Windows
• Makefile.win32 - for MSVC with NMake

Builds a static library. No shared library or external dependencies.

Usage Example

#include "CgeStr.h"
#include <stdio.h>

void print_rune(uint32_t rune, void* user) {
    printf("U+%04X ", rune);
}

int main() {
    CgeStr str = CGE_STR_LIT("Héllo, 世界!");
    CgeStrIter(str, print_rune, NULL);
    printf("\n");
    return 0;
}

Portability

• Written in C89+stdint.h
• No dynamic memory allocation
• No external dependencies

License

0BSD - a permissive license with no attribution required.