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/string.h | 110 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 na/include/libc-shim/string.h (limited to 'na/include/libc-shim/string.h') diff --git a/na/include/libc-shim/string.h b/na/include/libc-shim/string.h new file mode 100644 index 0000000..8a86304 --- /dev/null +++ b/na/include/libc-shim/string.h @@ -0,0 +1,110 @@ +#ifndef _STRING_H +#define _STRING_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include + +#if __cplusplus >= 201103L +#define NULL nullptr +#elif defined(__cplusplus) +#define NULL 0L +#else +#define NULL ((void*)0) +#endif + +#define __NEED_size_t +#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \ + || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \ + || defined(_BSD_SOURCE) +#define __NEED_locale_t +#endif + +#include + +void *memcpy (void *__restrict, const void *__restrict, size_t); +void *memmove (void *, const void *, size_t); +void *memset (void *, int, size_t); +int memcmp (const void *, const void *, size_t); +void *memchr (const void *, int, size_t); + +char *strcpy (char *__restrict, const char *__restrict); +char *strncpy (char *__restrict, const char *__restrict, size_t); + +char *strcat (char *__restrict, const char *__restrict); +char *strncat (char *__restrict, const char *__restrict, size_t); + +int strcmp (const char *, const char *); +int strncmp (const char *, const char *, size_t); + +int strcoll (const char *, const char *); +size_t strxfrm (char *__restrict, const char *__restrict, size_t); + +char *strchr (const char *, int); +char *strrchr (const char *, int); + +size_t strcspn (const char *, const char *); +size_t strspn (const char *, const char *); +char *strpbrk (const char *, const char *); +char *strstr (const char *, const char *); +char *strtok (char *__restrict, const char *__restrict); + +size_t strlen (const char *); + +char *strerror (int); + +#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE) +#include +#endif + +#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \ + || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \ + || defined(_BSD_SOURCE) +char *strtok_r (char *__restrict, const char *__restrict, char **__restrict); +int strerror_r (int, char *, size_t); +char *stpcpy(char *__restrict, const char *__restrict); +char *stpncpy(char *__restrict, const char *__restrict, size_t); +size_t strnlen (const char *, size_t); +char *strdup (const char *); +char *strndup (const char *, size_t); +char *strsignal(int); +char *strerror_l (int, locale_t); +int strcoll_l (const char *, const char *, locale_t); +size_t strxfrm_l (char *__restrict, const char *__restrict, size_t, locale_t); +void *memmem(const void *, size_t, const void *, size_t); +#endif + +#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \ + || defined(_BSD_SOURCE) +void *memccpy (void *__restrict, const void *__restrict, int, size_t); +#endif + +#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) +char *strsep(char **, const char *); +size_t strlcat (char *, const char *, size_t); +size_t strlcpy (char *, const char *, size_t); +void explicit_bzero (void *, size_t); +#endif + +#ifdef _GNU_SOURCE +#define strdupa(x) strcpy(alloca(strlen(x)+1),x) +int strverscmp (const char *, const char *); +char *strchrnul(const char *, int); +char *strcasestr(const char *, const char *); +void *memrchr(const void *, int, size_t); +void *mempcpy(void *, const void *, size_t); +#endif + +/* musl internal symbols used across translation units */ +char *__strchrnul(const char *, int); +void *__memrchr(const void *, int, size_t); +char *__stpcpy(char *__restrict, const char *__restrict); +char *__stpncpy(char *__restrict, const char *__restrict, size_t); + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3