1 /* SPDX-License-Identifier: GPL-2.0 */
3  * Lightweight buffered reading library.
37 	io->fd = fd;  in io__init()
38 	io->buf_len = buf_len;  in io__init()
39 	io->buf = buf;  in io__init()
40 	io->end = buf;  in io__init()
41 	io->data = buf;  in io__init()
42 	io->timeout_ms = 0;  in io__init()
43 	io->eof = false;  in io__init()
49 	char *ptr = io->data;  in io__get_char()
51 	if (io->eof)  in io__get_char()
52 		return -1;  in io__get_char()
54 	if (ptr == io->end) {  in io__get_char()
57 		if (io->timeout_ms != 0) {  in io__get_char()
60 					.fd = io->fd,  in io__get_char()
65 			n = poll(pfds, 1, io->timeout_ms);  in io__get_char()
70 				n = -1;  in io__get_char()
73 				io->eof = true;  in io__get_char()
74 				return -1;  in io__get_char()
77 		n = read(io->fd, io->buf, io->buf_len);  in io__get_char()
80 			io->eof = true;  in io__get_char()
81 			return -1;  in io__get_char()
83 		ptr = &io->buf[0];  in io__get_char()
84 		io->end = &io->buf[n];  in io__get_char()
86 	io->data = ptr + 1;  in io__get_char()
91  * first character isn't hexadecimal returns -2, io->eof returns -1, otherwise
92  * returns the character after the hexadecimal value which may be -1 for eof.
93  * If the read value is larger than a u64 the high-order bits will be dropped.
106 			*hex = (*hex << 4) | (ch - '0');  in io__get_hex()
108 			*hex = (*hex << 4) | (ch - 'a' + 10);  in io__get_hex()
110 			*hex = (*hex << 4) | (ch - 'A' + 10);  in io__get_hex()
112 			return -2;  in io__get_hex()
119 /* Read a positive decimal value with out argument dec. If the first character
120  * isn't a decimal returns -2, io->eof returns -1, otherwise returns the
121  * character after the decimal value which may be -1 for eof. If the read value
122  * is larger than a u64 the high-order bits will be dropped.
135 			*dec = (*dec * 10) + ch - '0';  in io__get_dec()
137 			return -2;  in io__get_dec()
184 	return -ENOMEM;  in io__getline()