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shared.c: Only setenv() if value is non-null

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Some setenv() implementations (e.g. the one in OpenBSD's stdlib)
segfault if we pass a NULL value. Only set environment variables if the
corresponding settings are defined to avoid this.

Note that this is a minor behaviour change as environment variables were
supposed to be set to an empty string if a setting was undefined. Given
that this feature isn't part of any official release yet, there's no
need to worry about backwards compatibility, really. Change the
documentation accordingly.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
This commit is contained in:
Lukas Fleischer 2011-09-14 11:52:43 +02:00 committed by Lars Hjemli
parent 8185169e5e
commit d96d2c98eb
2 changed files with 2 additions and 2 deletions
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2
cgitrc.5.txt
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@ -500,7 +500,7 @@ Also, all filters are handed the following environment variables:
If a setting is not defined for a repository and the corresponding global
setting is also not defined (if applicable), then the corresponding
environment variable will be an empty string.
environment variable will be unset.
MACRO EXPANSION

2
shared.c
View File

@ -392,7 +392,7 @@ void cgit_prepare_repo_env(struct cgit_repo * repo)
p = env_vars;
q = p + env_var_count;
for (; p < q; p++)
if (setenv(p->name, p->value, 1))
if (p->value && setenv(p->name, p->value, 1))
fprintf(stderr, warn, p->name, p->value);
}