1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * From lib/cmdline.c 3 * From lib/cmdline.c
4 */ 4 */
5 #include <stdlib.h> 5 #include <stdlib.h>
6 6
7 #if __has_attribute(__fallthrough__) 7 #if __has_attribute(__fallthrough__)
8 # define fallthrough __attr 8 # define fallthrough __attribute__((__fallthrough__))
9 #else 9 #else
10 # define fallthrough do {} 10 # define fallthrough do {} while (0) /* fallthrough */
11 #endif 11 #endif
12 12
13 unsigned long long memparse(const char *ptr, c 13 unsigned long long memparse(const char *ptr, char **retptr)
14 { 14 {
15 char *endptr; /* local pointer to en 15 char *endptr; /* local pointer to end of parsed string */
16 16
17 unsigned long long ret = strtoll(ptr, 17 unsigned long long ret = strtoll(ptr, &endptr, 0);
18 18
19 switch (*endptr) { 19 switch (*endptr) {
20 case 'E': 20 case 'E':
21 case 'e': 21 case 'e':
22 ret <<= 10; 22 ret <<= 10;
23 fallthrough; 23 fallthrough;
24 case 'P': 24 case 'P':
25 case 'p': 25 case 'p':
26 ret <<= 10; 26 ret <<= 10;
27 fallthrough; 27 fallthrough;
28 case 'T': 28 case 'T':
29 case 't': 29 case 't':
30 ret <<= 10; 30 ret <<= 10;
31 fallthrough; 31 fallthrough;
32 case 'G': 32 case 'G':
33 case 'g': 33 case 'g':
34 ret <<= 10; 34 ret <<= 10;
35 fallthrough; 35 fallthrough;
36 case 'M': 36 case 'M':
37 case 'm': 37 case 'm':
38 ret <<= 10; 38 ret <<= 10;
39 fallthrough; 39 fallthrough;
40 case 'K': 40 case 'K':
41 case 'k': 41 case 'k':
42 ret <<= 10; 42 ret <<= 10;
43 endptr++; 43 endptr++;
44 fallthrough; 44 fallthrough;
45 default: 45 default:
46 break; 46 break;
47 } 47 }
48 48
49 if (retptr) 49 if (retptr)
50 *retptr = endptr; 50 *retptr = endptr;
51 51
52 return ret; 52 return ret;
53 } 53 }
54 54
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