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authorRich Felker <dalias@aerifal.cx>2018-08-30 00:08:16 -0400
committerRich Felker <dalias@aerifal.cx>2018-08-30 00:08:16 -0400
commitcff4b910ab210e5c35f768c75c4562b3ae3e86f2 (patch)
tree0bf59a18f7bb2abd4482b317dec2ca366a0d68e5 /src/stdio/perror.c
parentcd8d8309975893736fe03e10b72de9678c5784fb (diff)
downloadmusl-cff4b910ab210e5c35f768c75c4562b3ae3e86f2.tar.gz
prevent perror from clobbering stderr's orientation
this requirement is specified by POSIX.
Diffstat (limited to 'src/stdio/perror.c')
-rw-r--r--src/stdio/perror.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/stdio/perror.c b/src/stdio/perror.c
index fdcb4d71..d0943f26 100644
--- a/src/stdio/perror.c
+++ b/src/stdio/perror.c
@@ -9,6 +9,11 @@ void perror(const char *msg)
char *errstr = strerror(errno);
FLOCK(f);
+
+ /* Save stderr's orientation and encoding rule, since perror is not
+ * permitted to change them. */
+ void *old_locale = f->locale;
+ int old_mode = f->mode;
if (msg && *msg) {
fwrite(msg, strlen(msg), 1, f);
@@ -18,5 +23,8 @@ void perror(const char *msg)
fwrite(errstr, strlen(errstr), 1, f);
fputc('\n', f);
+ f->mode = old_mode;
+ f->locale = old_locale;
+
FUNLOCK(f);
}