1 // SPDX-License-Identifier: GPL-2.0-or-later
18 #define ROMFS_MTD_READ(sb, ...) mtd_read((sb)->s_mtd, ##__VA_ARGS__)
30 	return (ret < 0 || rlen != buflen) ? -EIO : 0;  in romfs_mtd_read()
42 	size_t len;  in romfs_mtd_strnlen()  local
48 		ret = ROMFS_MTD_READ(sb, pos, segment, &len, buf);  in romfs_mtd_strnlen()
51 		p = memchr(buf, 0, len);  in romfs_mtd_strnlen()
53 			return n + (p - buf);  in romfs_mtd_strnlen()
54 		maxlen -= len;  in romfs_mtd_strnlen()
55 		pos += len;  in romfs_mtd_strnlen()
56 		n += len;  in romfs_mtd_strnlen()
64  * - return 1 if matched, 0 if differ, -ve if error
70 	size_t len, segment;  in romfs_mtd_strcmp()  local
79 		ret = ROMFS_MTD_READ(sb, pos, segment, &len, buf);  in romfs_mtd_strcmp()
82 		len--;  in romfs_mtd_strcmp()
83 		if (memcmp(buf, str, len) != 0)  in romfs_mtd_strcmp()
85 		buf[0] = buf[len];  in romfs_mtd_strcmp()
86 		size -= len;  in romfs_mtd_strcmp()
87 		pos += len;  in romfs_mtd_strcmp()
88 		str += len;  in romfs_mtd_strcmp()
112 		offset = pos & (ROMBSIZE - 1);  in romfs_blk_read()
113 		segment = min_t(size_t, buflen, ROMBSIZE - offset);  in romfs_blk_read()
116 			return -EIO;  in romfs_blk_read()
117 		memcpy(buf, bh->b_data + offset, segment);  in romfs_blk_read()
120 		buflen -= segment;  in romfs_blk_read()
131 				 unsigned long pos, size_t limit)  in romfs_blk_strnlen()  argument
140 	while (limit > 0) {  in romfs_blk_strnlen()
141 		offset = pos & (ROMBSIZE - 1);  in romfs_blk_strnlen()
142 		segment = min_t(size_t, limit, ROMBSIZE - offset);  in romfs_blk_strnlen()
145 			return -EIO;  in romfs_blk_strnlen()
146 		buf = bh->b_data + offset;  in romfs_blk_strnlen()
150 			return n + (p - buf);  in romfs_blk_strnlen()
151 		limit -= segment;  in romfs_blk_strnlen()
161  * - return 1 if matched, 0 if differ, -ve if error
173 		offset = pos & (ROMBSIZE - 1);  in romfs_blk_strcmp()
174 		segment = min_t(size_t, size, ROMBSIZE - offset);  in romfs_blk_strcmp()
177 			return -EIO;  in romfs_blk_strcmp()
178 		matched = (memcmp(bh->b_data + offset, str, segment) == 0);  in romfs_blk_strcmp()
180 		size -= segment;  in romfs_blk_strcmp()
184 			if (!bh->b_data[offset + segment])  in romfs_blk_strcmp()
197 		BUG_ON((pos & (ROMBSIZE - 1)) != 0);  in romfs_blk_strcmp()
200 			return -EIO;  in romfs_blk_strcmp()
201 		matched = !bh->b_data[0];  in romfs_blk_strcmp()
217 	size_t limit;  in romfs_dev_read()  local
219 	limit = romfs_maxsize(sb);  in romfs_dev_read()
220 	if (pos >= limit || buflen > limit - pos)  in romfs_dev_read()
221 		return -EIO;  in romfs_dev_read()
224 	if (sb->s_mtd)  in romfs_dev_read()
228 	if (sb->s_bdev)  in romfs_dev_read()
231 	return -EIO;  in romfs_dev_read()
240 	size_t limit;  in romfs_dev_strnlen()  local
242 	limit = romfs_maxsize(sb);  in romfs_dev_strnlen()
243 	if (pos >= limit)  in romfs_dev_strnlen()
244 		return -EIO;  in romfs_dev_strnlen()
245 	if (maxlen > limit - pos)  in romfs_dev_strnlen()
246 		maxlen = limit - pos;  in romfs_dev_strnlen()
249 	if (sb->s_mtd)  in romfs_dev_strnlen()
253 	if (sb->s_bdev)  in romfs_dev_strnlen()
256 	return -EIO;  in romfs_dev_strnlen()
261  * - the string to be compared to, str, may not be NUL-terminated; instead the
263  * - return 1 if matched, 0 if differ, -ve if error
268 	size_t limit;  in romfs_dev_strcmp()  local
270 	limit = romfs_maxsize(sb);  in romfs_dev_strcmp()
271 	if (pos >= limit)  in romfs_dev_strcmp()
272 		return -EIO;  in romfs_dev_strcmp()
274 		return -ENAMETOOLONG;  in romfs_dev_strcmp()
275 	if (size + 1 > limit - pos)  in romfs_dev_strcmp()
276 		return -EIO;  in romfs_dev_strcmp()
279 	if (sb->s_mtd)  in romfs_dev_strcmp()
283 	if (sb->s_bdev)  in romfs_dev_strcmp()
286 	return -EIO;  in romfs_dev_strcmp()