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| Source at commit 1733 created 12 years 6 months ago. By blackosx, Use the result from an intitial check to find if the target volume has an EFI system partition, later on in the installation process before checking for previous Chameleon installations. Add some feedback to the installer log. | |
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| 1 | /*␊ |
| 2 | * memmem.c␊ |
| 3 | *␊ |
| 4 | * Find a byte string inside a longer byte string␊ |
| 5 | *␊ |
| 6 | * This uses the "Not So Naive" algorithm, a very simple but␊ |
| 7 | * usually effective algorithm, see:␊ |
| 8 | *␊ |
| 9 | * http://www-igm.univ-mlv.fr/~lecroq/string/␊ |
| 10 | */␊ |
| 11 | ␊ |
| 12 | #include <string.h>␊ |
| 13 | ␊ |
| 14 | void *memmem(const void *haystack, size_t n, const void *needle, size_t m)␊ |
| 15 | {␊ |
| 16 | ␉const unsigned char *y = (const unsigned char *)haystack;␊ |
| 17 | ␉const unsigned char *x = (const unsigned char *)needle;␊ |
| 18 | ␊ |
| 19 | ␉size_t j, k, l;␊ |
| 20 | ␊ |
| 21 | ␉if (m > n || !m || !n)␊ |
| 22 | ␉␉return NULL;␊ |
| 23 | ␊ |
| 24 | ␉if (1 != m) {␊ |
| 25 | ␉␉if (x[0] == x[1]) {␊ |
| 26 | ␉␉␉k = 2;␊ |
| 27 | ␉␉␉l = 1;␊ |
| 28 | ␉␉} else {␊ |
| 29 | ␉␉␉k = 1;␊ |
| 30 | ␉␉␉l = 2;␊ |
| 31 | ␉␉}␊ |
| 32 | ␊ |
| 33 | ␉␉j = 0;␊ |
| 34 | ␉␉while (j <= n - m) {␊ |
| 35 | ␉␉␉if (x[1] != y[j + 1]) {␊ |
| 36 | ␉␉␉␉j += k;␊ |
| 37 | ␉␉␉} else {␊ |
| 38 | ␉␉␉␉if (!memcmp(x + 2, y + j + 2, m - 2)␊ |
| 39 | ␉␉␉␉ && x[0] == y[j])␊ |
| 40 | ␉␉␉␉␉return (void *)&y[j];␊ |
| 41 | ␉␉␉␉j += l;␊ |
| 42 | ␉␉␉}␊ |
| 43 | ␉␉}␊ |
| 44 | ␉} else␊ |
| 45 | ␉␉do {␊ |
| 46 | ␉␉␉if (*y == *x)␊ |
| 47 | ␉␉␉␉return (void *)y;␊ |
| 48 | ␉␉␉y++;␊ |
| 49 | ␉␉} while (--n);␊ |
| 50 | ␊ |
| 51 | ␉return NULL;␊ |
| 52 | }␊ |
| 53 | |
