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From: Ammar Faizi <[email protected]>
To: Willy Tarreau <[email protected]>
Cc: Ammar Faizi <[email protected]>,
	Alviro Iskandar Setiawan <[email protected]>,
	Nugraha <[email protected]>,
	"Paul E. McKenney" <[email protected]>,
	Linux Kernel Mailing List <[email protected]>,
	GNU/Weeb Mailing List <[email protected]>
Subject: [PATCH v2 9/9] tools/include/string: Implement `strdup()` and `strndup()`
Date: Tue, 29 Mar 2022 17:17:37 +0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

These functions are currently only available on architectures that have
my_syscall6() macro implemented. Since these functions use malloc(),
malloc() uses mmap(), mmap() depends on my_syscall6() macro.

On architectures that don't support my_syscall6(), these function will
always return NULL with errno set to ENOSYS.

Signed-off-by: Ammar Faizi <[email protected]>
===

@@ Changelog:

   Link v1: https://lore.gnuweeb.org/gwml/[email protected]
   v1 -> v2:
    * No changes *

   Link RFC v2: https://lore.kernel.org/lkml/[email protected]
   RFC v2 -> v1:
    * No changes *

   Link RFC v1: https://lore.kernel.org/lkml/[email protected]
   RFC v1 -> RFC v2:
    - Update strdup and strndup implementation, use strlen and strnlen to get
      the string length first (comment from Willy and Alviro).
    - Fix the subject line prefix, it was "tools/include/string: ", it should be
      "tools/nolibc/string: ".
---
 tools/include/nolibc/string.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tools/include/nolibc/string.h b/tools/include/nolibc/string.h
index f43d52a44d09..bef35bee9c44 100644
--- a/tools/include/nolibc/string.h
+++ b/tools/include/nolibc/string.h
@@ -9,6 +9,8 @@
 
 #include "std.h"
 
+static void *malloc(size_t len);
+
 /*
  * As much as possible, please keep functions alphabetically sorted.
  */
@@ -156,6 +158,36 @@ size_t strnlen(const char *str, size_t maxlen)
 	return len;
 }
 
+static __attribute__((unused))
+char *strdup(const char *str)
+{
+	size_t len;
+	char *ret;
+
+	len = strlen(str);
+	ret = malloc(len + 1);
+	if (__builtin_expect(ret != NULL, 1))
+		memcpy(ret, str, len + 1);
+
+	return ret;
+}
+
+static __attribute__((unused))
+char *strndup(const char *str, size_t maxlen)
+{
+	size_t len;
+	char *ret;
+
+	len = strnlen(str, maxlen);
+	ret = malloc(len + 1);
+	if (__builtin_expect(ret != NULL, 1)) {
+		memcpy(ret, str, len);
+		ret[len] = '\0';
+	}
+
+	return ret;
+}
+
 static __attribute__((unused))
 size_t strlcat(char *dst, const char *src, size_t size)
 {
-- 
Ammar Faizi


  parent reply	other threads:[~2022-03-29 10:18 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-29 10:17 [PATCH v2 0/9] Add dynamic memory allocator support for nolibc Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 1/9] tools/nolibc: x86-64: Update System V ABI document link Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 2/9] tools/nolibc: Replace `asm` with `__asm__` Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 3/9] tools/nolibc: Remove .global _start from the entry point code Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 4/9] tools/nolibc: i386: Implement syscall with 6 arguments Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 5/9] tools/nolibc/sys: Implement `mmap()` and `munmap()` Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 6/9] tools/nolibc/types: Implement `offsetof()` and `container_of()` macro Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 7/9] tools/nolibc/stdlib: Implement `malloc()`, `calloc()`, `realloc()` and `free()` Ammar Faizi
2022-03-29 10:17 ` [PATCH v2 8/9] tools/nolibc/string: Implement `strnlen()` Ammar Faizi
2022-03-29 10:17 ` Ammar Faizi [this message]
2022-03-29 10:20 ` [PATCH v2 0/9] Add dynamic memory allocator support for nolibc Ammar Faizi
2022-03-30  2:41   ` Willy Tarreau
2022-03-30 18:51     ` Paul E. McKenney
2022-03-31  6:34       ` Willy Tarreau

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