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linux: use fd_to_filename instead of _fitoa_word in ttyname_r.

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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.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Érico Nogueira 2021-05-03 22:51:51 -03:00 committed by Adhemerval Zanella
parent 330001202a
commit 0fb3dadca2
1 changed files with 3 additions and 5 deletions
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8
sysdeps/unix/sysv/linux/ttyname_r.c
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@ -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);