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.

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