From ef6723af9e7649d32b540aa39737fb27d1072ab6 Mon Sep 17 00:00:00 2001
From: guoshichao <guoshichao@xiaomi.com>
Date: Tue, 26 Nov 2024 10:43:46 +0800
Subject: [PATCH] nuttx: add get_current_dir_name implementation

Signed-off-by: guoshichao <guoshichao@xiaomi.com>
---
 include/unistd.h              |  1 +
 libs/libc/libc.csv            |  1 +
 libs/libc/unistd/lib_getcwd.c | 25 +++++++++++++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/include/unistd.h b/include/unistd.h
index 7557655fd7..a0a04253dc 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -389,6 +389,7 @@ unsigned int alarm(unsigned int seconds);
 int     chdir(FAR const char *path);
 int     fchdir(int fd);
 FAR char *getcwd(FAR char *buf, size_t size);
+FAR char *get_current_dir_name(void);
 
 /* File path operations */
 
diff --git a/libs/libc/libc.csv b/libs/libc/libc.csv
index 699726c13d..d9cf6d0655 100644
--- a/libs/libc/libc.csv
+++ b/libs/libc/libc.csv
@@ -97,6 +97,7 @@
 "getaddrinfo","netdb.h","defined(CONFIG_LIBC_NETDB)","int","FAR const char *","FAR const char *","FAR const struct addrinfo *","FAR struct addrinfo **"
 "getc","stdio.h","","int","FAR FILE *"
 "getcwd","unistd.h","!defined(CONFIG_DISABLE_ENVIRON)","FAR char *","FAR char *","size_t"
+"get_current_dir_name","unistd.h","!defined(CONFIG_DISABLE_ENVIRON)","FAR char *","void"
 "getegid","unistd.h","","gid_t"
 "geteuid","unistd.h","","uid_t"
 "gethostbyname","netdb.h","defined(CONFIG_LIBC_NETDB)","FAR struct hostent *","FAR const char *"
diff --git a/libs/libc/unistd/lib_getcwd.c b/libs/libc/unistd/lib_getcwd.c
index 41091fd1a1..8c6ce20651 100644
--- a/libs/libc/unistd/lib_getcwd.c
+++ b/libs/libc/unistd/lib_getcwd.c
@@ -127,3 +127,28 @@ FAR char *getcwd(FAR char *buf, size_t size)
   strlcpy(buf, pwd, size);
   return buf;
 }
+
+/****************************************************************************
+ * Name: get_current_dir_name
+ *
+ * Description:
+ *   get_current_dir_name() will allocate an buffer to hold the current
+ *   working directory info, and this buffer will be returned to user.
+ *   the user will be responsible to free the buffer.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   On success, get_current_dir_name() returns a pointer to a string
+ *   containing the pathname of the current working directory.
+ *   Otherwise, get_current_dir_name() returns a null pointer and
+ *   sets errno to indicate the error.
+ *   the errno can refer to: getcwd() function's comments.
+ *
+ ****************************************************************************/
+
+FAR char *get_current_dir_name(void)
+{
+  return getcwd(NULL, 0);
+}