lkml.org 
[lkml]   [2022]   [Mar]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH v1 6/6] tools/include/string: Implement `strdup()` and `strndup()`
Date
Add strdup and strndup support. These functions are only available on
architectures that have my_syscall6() macro from nolibc.

Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
tools/include/nolibc/string.h | 68 +++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)

diff --git a/tools/include/nolibc/string.h b/tools/include/nolibc/string.h
index 4554b6fcb400..413c65f7c853 100644
--- a/tools/include/nolibc/string.h
+++ b/tools/include/nolibc/string.h
@@ -9,6 +9,10 @@

#include "std.h"

+static void free(void *ptr);
+static void *malloc(size_t len);
+static void *realloc(void *old_ptr, size_t new_size);
+
/*
* As much as possible, please keep functions alphabetically sorted.
*/
@@ -127,6 +131,70 @@ size_t nolibc_strlen(const char *str)
nolibc_strlen((str)); \
})

+static __attribute__((unused))
+char *strdup(const char *str)
+{
+ size_t allocated = 2048;
+ size_t i;
+ char *ret;
+ char *tmp;
+
+ ret = malloc(allocated);
+ if (__builtin_expect(!ret, 0))
+ return NULL;
+
+ i = 0;
+ for (;;) {
+ char c = *str;
+ if (!c)
+ break;
+
+ if (i == allocated) {
+ allocated += 2048;
+ tmp = realloc(ret, allocated);
+ if (__builtin_expect(!tmp, 0)) {
+ free(ret);
+ return NULL;
+ }
+ ret = tmp;
+ }
+
+ ret[i++] = c;
+ str++;
+ }
+
+ ret[i] = '\0';
+ return ret;
+}
+
+static __attribute__((unused))
+char *strndup(const char *str, size_t maxlen)
+{
+ size_t i;
+ char *ret;
+
+ ret = malloc(maxlen + 1);
+ if (__builtin_expect(!ret, 0))
+ return NULL;
+
+ i = 0;
+ for (;;) {
+ char c = *str;
+ if (!c)
+ break;
+
+ if (i == maxlen)
+ break;
+
+ ret[i++] = c;
+ str++;
+ }
+
+ ret[i] = '\0';
+ return ret;
+}
+
+
static __attribute__((unused))
size_t strlcat(char *dst, const char *src, size_t size)
{
--
Ammar Faizi
\
 
 \ /
  Last update: 2022-03-20 10:39    [W:0.132 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site