path: root/libexec_unsetenv.c

/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST


int
libexec_unsetenv(struct libexec_command *cmd, const char *name)
{
	char **env;
	size_t i, n, len;

	if (!cmd || !name) {
		errno = EINVAL;
		return -1;
	}

	if (strchr(name, '='))
		return 0;

	env = cmd->environ ? cmd->environ : environ;
	len = strlen(name);

	n = 0;
	while (env[n])
		n++;

	for (i = 0; i < n;) {
		if (!strncmp(env[i], name, len) && env[i][len] == '=') {
			if (!cmd->environ) {
				if (libexec_copy_environ(cmd, NULL))
					return -1;
				env = cmd->environ;
			}
			free(env[i]);
			memmove(&env[i], &env[i + 1], (n - i - 1) * sizeof(*env));
			n--;
		} else {
			i++;
		}
	}

	return 0;
}


#else
LIBEXEC_CONST__ int main(void) {return 0;} /* TODO test */
#endif