projects / mirror_ubuntu-kernels.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| df4879fa NP |
2 | /* |
| 3 | * arch/arm/boot/compressed/string.c | |
| 4 | * | |
| 5 | * Small subset of simple string routines | |
| 6 | */ | |
| 7 | ||
| 8 | #include <linux/string.h> | |
| 9 | ||
| 10 | void *memcpy(void *__dest, __const void *__src, size_t __n) | |
| 11 | { | |
| 12 | int i = 0; | |
| 13 | unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; | |
| 14 | ||
| 15 | for (i = __n >> 3; i > 0; i--) { | |
| 16 | *d++ = *s++; | |
| 17 | *d++ = *s++; | |
| 18 | *d++ = *s++; | |
| 19 | *d++ = *s++; | |
| 20 | *d++ = *s++; | |
| 21 | *d++ = *s++; | |
| 22 | *d++ = *s++; | |
| 23 | *d++ = *s++; | |
| 24 | } | |
| 25 | ||
| 26 | if (__n & 1 << 2) { | |
| 27 | *d++ = *s++; | |
| 28 | *d++ = *s++; | |
| 29 | *d++ = *s++; | |
| 30 | *d++ = *s++; | |
| 31 | } | |
| 32 | ||
| 33 | if (__n & 1 << 1) { | |
| 34 | *d++ = *s++; | |
| 35 | *d++ = *s++; | |
| 36 | } | |
| 37 | ||
| 38 | if (__n & 1) | |
| 39 | *d++ = *s++; | |
| 40 | ||
| 41 | return __dest; | |
| 42 | } | |
| 43 | ||
| 44 | void *memmove(void *__dest, __const void *__src, size_t count) | |
| 45 | { | |
| 46 | unsigned char *d = __dest; | |
| 47 | const unsigned char *s = __src; | |
| 48 | ||
| 49 | if (__dest == __src) | |
| 50 | return __dest; | |
| 51 | ||
| 52 | if (__dest < __src) | |
| 53 | return memcpy(__dest, __src, count); | |
| 54 | ||
| 55 | while (count--) | |
| 56 | d[count] = s[count]; | |
| 57 | return __dest; | |
| 58 | } | |
| 59 | ||
| 60 | size_t strlen(const char *s) | |
| 61 | { | |
| 62 | const char *sc = s; | |
| 63 | ||
| 64 | while (*sc != '\0') | |
| 65 | sc++; | |
| 66 | return sc - s; | |
| 67 | } | |
| 68 | ||
| 76df6980 RH |
69 | size_t strnlen(const char *s, size_t count) |
| 70 | { | |
| 71 | const char *sc; | |
| 72 | ||
| 73 | for (sc = s; count-- && *sc != '\0'; ++sc) | |
| 74 | /* nothing */; | |
| 75 | return sc - s; | |
| 76 | } | |
| 77 | ||
| df4879fa NP |
78 | int memcmp(const void *cs, const void *ct, size_t count) |
| 79 | { | |
| 80 | const unsigned char *su1 = cs, *su2 = ct, *end = su1 + count; | |
| 81 | int res = 0; | |
| 82 | ||
| 83 | while (su1 < end) { | |
| 84 | res = *su1++ - *su2++; | |
| 85 | if (res) | |
| 86 | break; | |
| 87 | } | |
| 88 | return res; | |
| 89 | } | |
| 90 | ||
| 91 | int strcmp(const char *cs, const char *ct) | |
| 92 | { | |
| 93 | unsigned char c1, c2; | |
| 94 | int res = 0; | |
| 95 | ||
| 96 | do { | |
| 97 | c1 = *cs++; | |
| 98 | c2 = *ct++; | |
| 99 | res = c1 - c2; | |
| 100 | if (res) | |
| 101 | break; | |
| 102 | } while (c1); | |
| 103 | return res; | |
| 104 | } | |
| 105 | ||
| 106 | void *memchr(const void *s, int c, size_t count) | |
| 107 | { | |
| 108 | const unsigned char *p = s; | |
| 109 | ||
| 110 | while (count--) | |
| 111 | if ((unsigned char)c == *p++) | |
| 112 | return (void *)(p - 1); | |
| 113 | return NULL; | |
| 114 | } | |
| 115 | ||
| 116 | char *strchr(const char *s, int c) | |
| 117 | { | |
| 118 | while (*s != (char)c) | |
| 119 | if (*s++ == '\0') | |
| 120 | return NULL; | |
| 121 | return (char *)s; | |
| 122 | } | |
| 123 | ||
| 124 | #undef memset | |
| 125 | ||
| 126 | void *memset(void *s, int c, size_t count) | |
| 127 | { | |
| 128 | char *xs = s; | |
| 129 | while (count--) | |
| 130 | *xs++ = c; | |
| 131 | return s; | |
| 132 | } | |
| 133 | ||
| 134 | void __memzero(void *s, size_t count) | |
| 135 | { | |
| 136 | memset(s, 0, count); | |
| 137 | } |