libexec_unsetenv_first.c


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


int
libexec_unsetenv_first(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);

	for (i = 0; env[i]; i++)
		if (!strncmp(env[i], name, len) && env[i][len] == '=')
			break;

	if (env[i]) {
		n = i;
		while (env[n])
			n++;
		if (!cmd->environ)
			if (libexec_copy_environ(cmd, NULL))
				return -1;
		free(cmd->environ[i]);
		memmove(&cmd->environ[i], &cmd->environ[i + 1], (n - i - 1) * sizeof(*cmd->environ));
	}

	return 0;
}


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