| 1 | #include <string.h>
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| 2 |
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| 3 | #ifdef _MSC_VER
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| 4 | _inline void *
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| 5 | #else
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| 6 | static __inline__ void *
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| 7 | #endif
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| 8 | my_inline_memchr(const void *pv, int ch, register size_t cb)
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| 9 | {
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| 10 | register const unsigned int uch = (unsigned)ch;
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| 11 | register const unsigned char *pb = (const unsigned char *)pv;
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| 12 | #if 0 /* 8-byte loop unroll */
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| 13 | while (cb >= 8)
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| 14 | {
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| 15 | if (*pb == uch)
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| 16 | return (unsigned char *)pb;
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| 17 | if (pb[1] == uch)
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| 18 | return (unsigned char *)pb + 1;
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| 19 | if (pb[2] == uch)
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| 20 | return (unsigned char *)pb + 2;
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| 21 | if (pb[3] == uch)
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| 22 | return (unsigned char *)pb + 3;
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| 23 | if (pb[4] == uch)
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| 24 | return (unsigned char *)pb + 4;
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| 25 | if (pb[5] == uch)
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| 26 | return (unsigned char *)pb + 5;
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| 27 | if (pb[6] == uch)
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| 28 | return (unsigned char *)pb + 6;
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| 29 | if (pb[7] == uch)
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| 30 | return (unsigned char *)pb + 7;
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| 31 | cb -= 8;
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| 32 | pb += 8;
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| 33 | }
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| 34 | switch (cb & 7)
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| 35 | {
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| 36 | case 0:
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| 37 | break;
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| 38 | case 1:
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| 39 | if (*pb == uch)
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| 40 | return (unsigned char *)pb;
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| 41 | break;
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| 42 | case 2:
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| 43 | if (*pb == uch)
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| 44 | return (unsigned char *)pb;
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| 45 | if (pb[1] == uch)
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| 46 | return (unsigned char *)pb + 1;
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| 47 | break;
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| 48 | case 3:
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| 49 | if (*pb == uch)
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| 50 | return (unsigned char *)pb;
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| 51 | if (pb[1] == uch)
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| 52 | return (unsigned char *)pb + 1;
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| 53 | if (pb[2] == uch)
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| 54 | return (unsigned char *)pb + 2;
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| 55 | break;
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| 56 | case 4:
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| 57 | if (*pb == uch)
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| 58 | return (unsigned char *)pb;
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| 59 | if (pb[1] == uch)
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| 60 | return (unsigned char *)pb + 1;
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| 61 | if (pb[2] == uch)
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| 62 | return (unsigned char *)pb + 2;
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| 63 | if (pb[3] == uch)
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| 64 | return (unsigned char *)pb + 3;
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| 65 | break;
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| 66 | case 5:
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| 67 | if (*pb == uch)
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| 68 | return (unsigned char *)pb;
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| 69 | if (pb[1] == uch)
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| 70 | return (unsigned char *)pb + 1;
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| 71 | if (pb[2] == uch)
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| 72 | return (unsigned char *)pb + 2;
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| 73 | if (pb[3] == uch)
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| 74 | return (unsigned char *)pb + 3;
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| 75 | if (pb[4] == uch)
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| 76 | return (unsigned char *)pb + 4;
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| 77 | break;
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| 78 | case 6:
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| 79 | if (*pb == uch)
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| 80 | return (unsigned char *)pb;
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| 81 | if (pb[1] == uch)
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| 82 | return (unsigned char *)pb + 1;
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| 83 | if (pb[2] == uch)
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| 84 | return (unsigned char *)pb + 2;
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| 85 | if (pb[3] == uch)
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| 86 | return (unsigned char *)pb + 3;
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| 87 | if (pb[4] == uch)
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| 88 | return (unsigned char *)pb + 4;
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| 89 | if (pb[5] == uch)
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| 90 | return (unsigned char *)pb + 5;
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| 91 | break;
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| 92 | case 7:
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| 93 | if (*pb == uch)
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| 94 | return (unsigned char *)pb;
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| 95 | if (pb[1] == uch)
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| 96 | return (unsigned char *)pb + 1;
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| 97 | if (pb[2] == uch)
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| 98 | return (unsigned char *)pb + 2;
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| 99 | if (pb[3] == uch)
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| 100 | return (unsigned char *)pb + 3;
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| 101 | if (pb[4] == uch)
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| 102 | return (unsigned char *)pb + 4;
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| 103 | if (pb[5] == uch)
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| 104 | return (unsigned char *)pb + 5;
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| 105 | if (pb[6] == uch)
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| 106 | return (unsigned char *)pb + 6;
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| 107 | break;
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| 108 | }
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| 109 |
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| 110 | #elif 1 /* 4 byte loop unroll */
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| 111 | while (cb >= 4)
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| 112 | {
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| 113 | if (*pb == uch)
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| 114 | return (unsigned char *)pb;
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| 115 | if (pb[1] == uch)
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| 116 | return (unsigned char *)pb + 1;
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| 117 | if (pb[2] == uch)
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| 118 | return (unsigned char *)pb + 2;
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| 119 | if (pb[3] == uch)
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| 120 | return (unsigned char *)pb + 3;
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| 121 | cb -= 4;
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| 122 | pb += 4;
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| 123 | }
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| 124 | switch (cb & 3)
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| 125 | {
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| 126 | case 0:
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| 127 | break;
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| 128 | case 1:
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| 129 | if (*pb == uch)
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| 130 | return (unsigned char *)pb;
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| 131 | break;
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| 132 | case 2:
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| 133 | if (*pb == uch)
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| 134 | return (unsigned char *)pb;
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| 135 | if (pb[1] == uch)
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| 136 | return (unsigned char *)pb + 1;
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| 137 | break;
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| 138 | case 3:
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| 139 | if (*pb == uch)
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| 140 | return (unsigned char *)pb;
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| 141 | if (pb[1] == uch)
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| 142 | return (unsigned char *)pb + 1;
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| 143 | if (pb[2] == uch)
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| 144 | return (unsigned char *)pb + 2;
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| 145 | break;
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| 146 | }
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| 147 |
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| 148 | #else /* the basic loop */
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| 149 | while (cb > 0)
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| 150 | {
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| 151 | if (*pb == uch)
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| 152 | return (void *)pb;
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| 153 | cb--;
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| 154 | pb++;
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| 155 | }
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| 156 | #endif
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| 157 | return 0;
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| 158 | }
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| 159 |
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| 160 | #define memchr my_inline_memchr
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| 161 |
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