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/lib/string/strtok_r.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 na/lib/string/strtok_r.c (limited to 'na/lib/string/strtok_r.c') diff --git a/na/lib/string/strtok_r.c b/na/lib/string/strtok_r.c new file mode 100644 index 0000000..a702703 --- /dev/null +++ b/na/lib/string/strtok_r.c @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: MIT */ +/* Derived from musl libc (Copyright © 2005-2020 Rich Felker, et al.) */ + +#include + +char *strtok_r(char *restrict s, const char *restrict sep, char **restrict p) +{ + if (!s && !(s = *p)) return NULL; + s += strspn(s, sep); + if (!*s) return *p = 0; + *p = s + strcspn(s, sep); + if (**p) *(*p)++ = 0; + else *p = 0; + return s; +} -- cgit v1.2.3