git

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#include "../git-compat-util.h"
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int gitsetenv(const char *name, const char *value, int replace)
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{
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	int out;
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	size_t namelen, valuelen;
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	char *envstr;
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	if (!name || strchr(name, '=') || !value) {
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		errno = EINVAL;
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		return -1;
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	}
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	if (!replace) {
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		char *oldval = NULL;
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		oldval = getenv(name);
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		if (oldval) return 0;
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	}
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	namelen = strlen(name);
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	valuelen = strlen(value);
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	envstr = malloc(st_add3(namelen, valuelen, 2));
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	if (!envstr) {
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		errno = ENOMEM;
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		return -1;
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	}
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	memcpy(envstr, name, namelen);
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	envstr[namelen] = '=';
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	memcpy(envstr + namelen + 1, value, valuelen);
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	envstr[namelen + valuelen + 1] = 0;
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	out = putenv(envstr);
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	/* putenv(3) makes the argument string part of the environment,
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	 * and changing that string modifies the environment --- which
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	 * means we do not own that storage anymore.  Do not free
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	 * envstr.
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	 */
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	return out;
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}
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