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fix bogus lazy allocation in ctermid and missing malloc failure check

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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.
This commit is contained in:
Rich Felker 2013-07-09 00:50:11 -04:00
parent cdf0f53f8b
commit b6218764eb
1 changed files with 7 additions and 10 deletions
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17
src/unistd/ctermid.c
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@ -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;
}