busybox/libpwdgrp/pwd_grp_internal.c

/* vi: set sw=4 ts=4: */
/* Copyright (C) 2003     Manuel Novoa III
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/* Nov 6, 2003  Initial version.
 *
 * NOTE: This implementation is quite strict about requiring all
 *    field seperators.  It also does not allow leading whitespace
 *    except when processing the numeric fields.  glibc is more
 *    lenient.  See the various glibc difference comments below.
 *
 * TODO:
 *    Move to dynamic allocation of (currently statically allocated)
 *      buffers; especially for the group-related functions since
 *      large group member lists will cause error returns.
 */

#ifndef GETXXKEY_R_FUNC
#error GETXXKEY_R_FUNC is not defined!
#endif

int GETXXKEY_R_FUNC(GETXXKEY_R_KEYTYPE key,
				GETXXKEY_R_ENTTYPE *__restrict resultbuf,
				char *__restrict buffer, size_t buflen,
				GETXXKEY_R_ENTTYPE **__restrict result)
{
	FILE *stream;
	int rv;

	*result = NULL;

	stream = fopen_for_read(GETXXKEY_R_PATHNAME);
	if (!stream)
		return errno;
	while (1) {
		rv = bb__pgsreader(GETXXKEY_R_PARSER, resultbuf, buffer, buflen, stream);
		if (!rv) {
			if (GETXXKEY_R_TEST(resultbuf)) { /* found key? */
				*result = resultbuf;
				break;
			}
		} else {
			if (rv == ENOENT) {  /* EOF encountered */
				rv = 0;
			}
			break;
		}
	}
	fclose(stream);

	return rv;
}

#undef GETXXKEY_R_FUNC
#undef GETXXKEY_R_PARSER
#undef GETXXKEY_R_ENTTYPE
#undef GETXXKEY_R_TEST
#undef GETXXKEY_R_KEYTYPE
#undef GETXXKEY_R_PATHNAME