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authorRich Felker <dalias@aerifal.cx>2013-07-09 00:50:11 -0400
committerRich Felker <dalias@aerifal.cx>2013-07-09 00:50:11 -0400
commitb6218764ebca59ff5dae0e87b696188c8de0119e (patch)
treef0f622a2360cd8cfa7a39c2d0fd7832679811e9c /src/unistd
parentcdf0f53f8ba0e79dedb83c626851597bacec53ca (diff)
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fix bogus lazy allocation in ctermid and missing malloc failure check
also clean up, optimize, and simplify the code, removing branches by simply pre-setting the result string to an empty string, which will be preserved if other operations fail.
Diffstat (limited to 'src/unistd')
-rw-r--r--src/unistd/ctermid.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/src/unistd/ctermid.c b/src/unistd/ctermid.c
index c238905a..ffa9b758 100644
--- a/src/unistd/ctermid.c
+++ b/src/unistd/ctermid.c
@@ -8,17 +8,14 @@
char *ctermid(char *s)
{
- static char *s2;
+ static char s2[L_ctermid];
int fd;
- if (!s) {
- if (!s2) s2 = malloc(L_ctermid);
- s = s2;
- }
+ if (!s) s = s2;
+ *s = 0;
fd = open("/dev/tty", O_WRONLY | O_NOCTTY | O_CLOEXEC);
- if (fd < 0)
- return strcpy(s, "");
- if (ttyname_r(fd, s, L_ctermid))
- strcpy(s, "");
- __syscall(SYS_close, fd);
+ if (fd >= 0) {
+ ttyname_r(fd, s, L_ctermid);
+ __syscall(SYS_close, fd);
+ }
return s;
}