From 5278f6def4248391a481382bd7b0042b04c829f2 Mon Sep 17 00:00:00 2001 From: Richard Qin Date: Tue, 21 Apr 2026 23:16:50 +0800 Subject: feat: add string manipulation functions derived from musl libc This commit introduces a variety of string manipulation functions, including: - `memmem`: Searches for a substring in a memory area. - `memmove`: Safely copies memory areas, handling overlaps. - `mempcpy`: Copies memory and returns a pointer to the end of the destination. - `memrchr`: Finds the last occurrence of a character in a memory area. - `memset`: Fills a memory area with a specified value. - `rindex`: Returns the last occurrence of a character in a string. - `stpcpy` and `stpncpy`: Copies strings and returns a pointer to the end. - `strcat`, `strchr`, `strcspn`, `strlcat`, `strlcpy`, `strlen`, `strncat`, `strncmp`, `strncpy`, `strnlen`, `strpbrk`, `strrchr`, `strstr`, `strtok`, and `strtok_r`: Various string manipulation functions for concatenation, searching, and tokenization. Assembly implementations for `memcpy`, `memmove`, and `memset` are also included for optimized performance on x86_64 architectures. --- na/include/libc-shim/features.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 na/include/libc-shim/features.h (limited to 'na/include/libc-shim/features.h') diff --git a/na/include/libc-shim/features.h b/na/include/libc-shim/features.h new file mode 100644 index 0000000..a3466c8 --- /dev/null +++ b/na/include/libc-shim/features.h @@ -0,0 +1,12 @@ +/* Shim: musl expects this header */ +#ifndef _FEATURES_H +#define _FEATURES_H + +/* weak_alias: musl uses this for symbol aliasing (e.g. __memrchr -> memrchr) */ +#define weak_alias(old, new) \ + extern __typeof(old) new __attribute__((__weak__, __alias__(#old))) + +/* hidden attribute used by some musl sources */ +#define hidden __attribute__((__visibility__("hidden"))) + +#endif -- cgit v1.2.3