From 68b68cb3a475ed999d150376c32a30ed97bd6fe9 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Wed, 11 Sep 2002 22:16:50 +0000 Subject: [PATCH] * sysdeps/generic/dl-environ.c (unsetenv): Redo last fix without strncmp, keeps the code smaller for a non-performance-critical case. --- ChangeLog | 3 +++ sysdeps/generic/dl-environ.c | 33 ++++++++++++++++++++------------- 2 files changed, 23 insertions(+), 13 deletions(-) diff --git a/ChangeLog b/ChangeLog index 828b537..5d6a1cb 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,8 @@ 2002-09-11 Roland McGrath + * 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 . diff --git a/sysdeps/generic/dl-environ.c b/sysdeps/generic/dl-environ.c index 30fe565..089e89e 100644 --- a/sysdeps/generic/dl-environ.c +++ b/sysdeps/generic/dl-environ.c @@ -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; - - do - dp[0] = dp[1]; - while (*dp++); - /* Continue the loop in case NAME appears again. */ - } - else - ++ep; + { + size_t cnt = 0; + + 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; } -- 2.7.4