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[2/3] linux: use fd_to_filename instead of _fitoa_word in ttyname_r.

Message ID 20210504015152.31064-2-ericonr@disroot.org
State Committed
Commit 0fb3dadca2548df348904d083b4d911fa25503f5
Headers show
Series [1/3] misc: use _fitoa_word to implement __fd_to_filename. | expand

Commit Message

√Črico Nogueira May 4, 2021, 1:51 a.m. UTC
Simplifies the logic and makes intent clearer, while at the same time
decreasing binary size.

On x86_64, dropped from 1883270 to 1883206, a 64 byte decrease.
---
 sysdeps/unix/sysv/linux/ttyname_r.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

Comments

Adhemerval Zanella May 4, 2021, 1:18 p.m. UTC | #1
On 03/05/2021 22:51, √Črico Nogueira via Libc-alpha wrote:
> Simplifies the logic and makes intent clearer, while at the same time
> decreasing binary size.
> 
> On x86_64, dropped from 1883270 to 1883206, a 64 byte decrease.

LGTM, thanks.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
>  sysdeps/unix/sysv/linux/ttyname_r.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/sysdeps/unix/sysv/linux/ttyname_r.c b/sysdeps/unix/sysv/linux/ttyname_r.c
> index c1092d1695..fa1578fb64 100644
> --- a/sysdeps/unix/sysv/linux/ttyname_r.c
> +++ b/sysdeps/unix/sysv/linux/ttyname_r.c
> @@ -26,7 +26,7 @@
>  #include <string.h>
>  #include <stdlib.h>
>  
> -#include <_itoa.h>
> +#include <fd_to_filename.h>
>  
>  #include "ttyname.h"
>  
> @@ -92,7 +92,7 @@ getttyname_r (char *buf, size_t buflen, const struct stat64 *mytty,
>  int
>  __ttyname_r (int fd, char *buf, size_t buflen)
>  {
> -  char procname[30];
> +  struct fd_to_filename filename;
>    struct stat64 st, st1;
>    int dostat = 0;
>    int doispty = 0;
> @@ -122,9 +122,7 @@ __ttyname_r (int fd, char *buf, size_t buflen)
>      return errno;
>  
>    /* We try using the /proc filesystem.  */
> -  *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
> -
> -  ssize_t ret = __readlink (procname, buf, buflen - 1);
> +  ssize_t ret = __readlink (__fd_to_filename (fd, &filename), buf, buflen - 1);
>    if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG))
>      {
>        __set_errno (ERANGE);
>
diff mbox series

Patch

diff --git a/sysdeps/unix/sysv/linux/ttyname_r.c b/sysdeps/unix/sysv/linux/ttyname_r.c
index c1092d1695..fa1578fb64 100644
--- a/sysdeps/unix/sysv/linux/ttyname_r.c
+++ b/sysdeps/unix/sysv/linux/ttyname_r.c
@@ -26,7 +26,7 @@ 
 #include <string.h>
 #include <stdlib.h>
 
-#include <_itoa.h>
+#include <fd_to_filename.h>
 
 #include "ttyname.h"
 
@@ -92,7 +92,7 @@  getttyname_r (char *buf, size_t buflen, const struct stat64 *mytty,
 int
 __ttyname_r (int fd, char *buf, size_t buflen)
 {
-  char procname[30];
+  struct fd_to_filename filename;
   struct stat64 st, st1;
   int dostat = 0;
   int doispty = 0;
@@ -122,9 +122,7 @@  __ttyname_r (int fd, char *buf, size_t buflen)
     return errno;
 
   /* We try using the /proc filesystem.  */
-  *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
-
-  ssize_t ret = __readlink (procname, buf, buflen - 1);
+  ssize_t ret = __readlink (__fd_to_filename (fd, &filename), buf, buflen - 1);
   if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG))
     {
       __set_errno (ERANGE);