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* sysdeps/generic/dl-environ.c (unsetenv): Redo last fix without

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strncmp, keeps the code smaller for a non-performance-critical case.
This commit is contained in:
Roland McGrath 2002-09-11 22:16:50 +00:00
parent 0d35c2426d
commit 68b68cb3a4
2 changed files with 22 additions and 12 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2002-09-11 Roland McGrath <roland@redhat.com>
* sysdeps/generic/dl-environ.c (unsetenv): Redo last fix without
strncmp, keeps the code smaller for a non-performance-critical case.
* sysdeps/generic/dl-environ.c (unsetenv): Rewritten using strncmp,
no longer wrongly matches arbitrary prefixes of NAME.
Reported by Jakub Jelinek <jakub@redhat.com>.

31
sysdeps/generic/dl-environ.c
View File

@ -57,23 +57,30 @@ extern char **__environ attribute_hidden;
int
unsetenv (const char *name)
{
const size_t len = strlen (name);
char **ep;
ep = __environ;
while (*ep != NULL)
if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
{
/* Found it. Remove this pointer by moving later ones back. */
char **dp = ep;
{
size_t cnt = 0;
do
dp[0] = dp[1];
while (*dp++);
/* Continue the loop in case NAME appears again. */
}
else
++ep;
while ((*ep)[cnt] == name[cnt] && name[cnt] != '\0')
++cnt;
if (name[cnt] == '\0' && (*ep)[cnt] == '=')
{
/* Found it. Remove this pointer by moving later ones to
the front. */
char **dp = ep;
do
dp[0] = dp[1];
while (*dp++);
/* Continue the loop in case NAME appears again. */
}
else
++ep;
}
return 0;
}