Re: [PATCH] Add compat/setenv.c, use in git.c.

From: Junio C Hamano <junkio@cox.net>
Date: Dec 4, 2005, 22:31 UTC
Message-ID: <7vr78sebp8.fsf@assigned-by-dhcp.cox.net>
In-Reply-To: <43935A9E.2060602@zytor.com>

"H. Peter Anvin" <hpa@zytor.com> writes:

Show 14 quoted lines

> Jason Riedy wrote:
>> +
>> +int gitsetenv(const char *name, const char *value, int replace)
>> +{
>> +...
>> +	envstr = malloc((namelen + valuelen + 2) * sizeof(char));
>> +...
>> +	out = putenv(envstr);
>> +
>> +	free(envstr);
>> +	return out;
>> +}
>
> Wouldn't this be a good case for using alloca()?

Oops.  Isn't the patch itself wrong, so is using alloca()?

putenv(3) says

	int putenv(char *string);

	The string pointed to by string becomes part of the environment,
	so altering the string changes the environment.

which tell sme that whatever we pass to putenv() we should *not* free.