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master ec8a17e 2/2: Adjust to recent Gnulib changes
From: |
Paul Eggert |
Subject: |
master ec8a17e 2/2: Adjust to recent Gnulib changes |
Date: |
Fri, 25 Dec 2020 04:40:47 -0500 (EST) |
branch: master
commit ec8a17e938c3ef213709ea6b6b3e565333a9c508
Author: Paul Eggert <eggert@cs.ucla.edu>
Commit: Paul Eggert <eggert@cs.ucla.edu>
Adjust to recent Gnulib changes
The latest Gnulib merge brought in free-posix, which causes 'free'
to preserve errno. This lets us simplify some Emacs code that
calls 'free'.
* admin/merge-gnulib (GNULIB_MODULES): Add free-posix.
This module is pulled in by canonicalize-lgpl anyway,
so we might as well rely on it.
* lib-src/emacsclient.c (get_current_dir_name):
Sync better with src/sysdep.c.
* lib-src/etags.c (process_file_name, etags_mktmp):
* lib-src/update-game-score.c (unlock_file):
* src/fileio.c (file_accessible_directory_p):
* src/sysdep.c (get_current_dir_name_or_unreachable):
Simplify by assuming that 'free' preserves errno.
* src/alloc.c (malloc_unblock_input):
Preserve errno, so that xfree preserves errno.
* src/sysdep.c (get_current_dir_name_or_unreachable):
Simplify by using strdup instead of malloc+memcpy.
No need for realloc (and the old code leaked memory anyway on
failure); just use free+malloc.
---
admin/merge-gnulib | 3 ++-
lib-src/emacsclient.c | 39 ++++++++++++---------------------------
lib-src/etags.c | 17 +++--------------
lib-src/update-game-score.c | 4 ++--
src/alloc.c | 6 +++++-
src/fileio.c | 3 ---
src/sysdep.c | 26 +++++++-------------------
7 files changed, 31 insertions(+), 67 deletions(-)
diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index 164300e..880dc5e 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -34,7 +34,8 @@ GNULIB_MODULES='
d-type diffseq double-slash-root dtoastr dtotimespec dup2
environ execinfo explicit_bzero faccessat
fchmodat fcntl fcntl-h fdopendir
- filemode filename filevercmp flexmember fpieee fstatat fsusage fsync futimens
+ filemode filename filevercmp flexmember fpieee
+ free-posix fstatat fsusage fsync futimens
getloadavg getopt-gnu getrandom gettime gettimeofday gitlog-to-changelog
ieee754-h ignore-value intprops largefile libgmp lstat
manywarnings memmem-simple mempcpy memrchr minmax mkostemp mktime nstrftime
diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 871fa7a..8d184e2 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -251,7 +251,6 @@ get_current_dir_name (void)
bufsize_max = min (bufsize_max, PATH_MAX);
#endif
- char *buf;
struct stat dotstat, pwdstat;
size_t pwdlen;
/* If PWD is accurate, use it instead of calling getcwd. PWD is
@@ -265,37 +264,23 @@ get_current_dir_name (void)
&& stat (".", &dotstat) == 0
&& dotstat.st_ino == pwdstat.st_ino
&& dotstat.st_dev == pwdstat.st_dev)
- {
- buf = xmalloc (strlen (pwd) + 1);
- strcpy (buf, pwd);
- }
+ return strdup (pwd);
else
{
- size_t buf_size = 1024;
+ ptrdiff_t buf_size = min (bufsize_max, 1024);
for (;;)
- {
- int tmp_errno;
- buf = malloc (buf_size);
- if (! buf)
- break;
- if (getcwd (buf, buf_size) == buf)
- break;
- tmp_errno = errno;
+ {
+ char *buf = malloc (buf_size);
+ if (!buf)
+ return NULL;
+ if (getcwd (buf, buf_size) == buf)
+ return buf;
free (buf);
- if (tmp_errno != ERANGE)
- {
- errno = tmp_errno;
- return NULL;
- }
- buf_size *= 2;
- if (! buf_size)
- {
- errno = ENOMEM;
- return NULL;
- }
- }
+ if (errno != ERANGE || buf_size == bufsize_max)
+ return NULL;
+ buf_size = buf_size <= bufsize_max / 2 ? 2 * buf_size : bufsize_max;
+ }
}
- return buf;
}
#endif
diff --git a/lib-src/etags.c b/lib-src/etags.c
index a1c6837..071892e 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -1643,19 +1643,10 @@ process_file_name (char *file, language *lang)
char *cmd = concat (cmd1, "' > ", tmp_name);
#endif
free (cmd1);
- int tmp_errno;
- if (system (cmd) == -1)
- {
- inf = NULL;
- tmp_errno = EINVAL;
- }
- else
- {
- inf = fopen (tmp_name, "r" FOPEN_BINARY);
- tmp_errno = errno;
- }
+ inf = (system (cmd) == -1
+ ? NULL
+ : fopen (tmp_name, "r" FOPEN_BINARY));
free (cmd);
- errno = tmp_errno;
}
if (!inf)
@@ -7068,9 +7059,7 @@ etags_mktmp (void)
int fd = mkostemp (templt, O_CLOEXEC);
if (fd < 0 || close (fd) != 0)
{
- int temp_errno = errno;
free (templt);
- errno = temp_errno;
templt = NULL;
}
#if defined (DOS_NT)
diff --git a/lib-src/update-game-score.c b/lib-src/update-game-score.c
index 93aa039..fc6e728 100644
--- a/lib-src/update-game-score.c
+++ b/lib-src/update-game-score.c
@@ -499,9 +499,9 @@ unlock_file (const char *filename, void *state)
char *lockpath = (char *) state;
int saved_errno = errno;
int ret = unlink (lockpath);
- int unlink_errno = errno;
+ if (0 <= ret)
+ errno = saved_errno;
free (lockpath);
- errno = ret < 0 ? unlink_errno : saved_errno;
return ret;
}
diff --git a/src/alloc.c b/src/alloc.c
index adbfa18..0b387dd 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -732,7 +732,11 @@ static void
malloc_unblock_input (void)
{
if (block_input_in_memory_allocators)
- unblock_input ();
+ {
+ int err = errno;
+ unblock_input ();
+ errno = err;
+ }
}
# define MALLOC_BLOCK_INPUT malloc_block_input ()
# define MALLOC_UNBLOCK_INPUT malloc_unblock_input ()
diff --git a/src/fileio.c b/src/fileio.c
index 651e765..23b4523 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3050,7 +3050,6 @@ file_accessible_directory_p (Lisp_Object file)
ptrdiff_t len = SBYTES (file);
char const *dir;
bool ok;
- int saved_errno;
USE_SAFE_ALLOCA;
/* Normally a file "FOO" is an accessible directory if "FOO/." exists.
@@ -3075,9 +3074,7 @@ file_accessible_directory_p (Lisp_Object file)
}
ok = file_access_p (dir, F_OK);
- saved_errno = errno;
SAFE_FREE ();
- errno = saved_errno;
return ok;
#endif /* !DOS_NT */
}
diff --git a/src/sysdep.c b/src/sysdep.c
index 29c88f5..eeb9d18 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -314,33 +314,21 @@ get_current_dir_name_or_unreachable (void)
&& emacs_fstatat (AT_FDCWD, ".", &dotstat, 0) == 0
&& dotstat.st_ino == pwdstat.st_ino
&& dotstat.st_dev == pwdstat.st_dev)
- {
- char *buf = malloc (pwdlen + 1);
- if (!buf)
- return NULL;
- return memcpy (buf, pwd, pwdlen + 1);
- }
+ return strdup (pwd);
else
{
ptrdiff_t buf_size = min (bufsize_max, 1024);
- char *buf = malloc (buf_size);
- if (!buf)
- return NULL;
for (;;)
{
+ char *buf = malloc (buf_size);
+ if (!buf)
+ return NULL;
if (getcwd (buf, buf_size) == buf)
return buf;
- int getcwd_errno = errno;
- if (getcwd_errno != ERANGE || buf_size == bufsize_max)
- {
- free (buf);
- errno = getcwd_errno;
- return NULL;
- }
+ free (buf);
+ if (errno != ERANGE || buf_size == bufsize_max)
+ return NULL;
buf_size = buf_size <= bufsize_max / 2 ? 2 * buf_size : bufsize_max;
- buf = realloc (buf, buf_size);
- if (!buf)
- return NULL;
}
}
}