Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/string.h> |
2 | ||
f73920cd | 3 | char *strstr(const char *cs, const char *ct) |
1da177e4 LT |
4 | { |
5 | int d0, d1; | |
f73920cd | 6 | register char *__res; |
1da177e4 LT |
7 | __asm__ __volatile__( |
8 | "movl %6,%%edi\n\t" | |
9 | "repne\n\t" | |
10 | "scasb\n\t" | |
11 | "notl %%ecx\n\t" | |
12 | "decl %%ecx\n\t" /* NOTE! This also sets Z if searchstring='' */ | |
13 | "movl %%ecx,%%edx\n" | |
14 | "1:\tmovl %6,%%edi\n\t" | |
15 | "movl %%esi,%%eax\n\t" | |
16 | "movl %%edx,%%ecx\n\t" | |
17 | "repe\n\t" | |
18 | "cmpsb\n\t" | |
19 | "je 2f\n\t" /* also works for empty string, see above */ | |
20 | "xchgl %%eax,%%esi\n\t" | |
21 | "incl %%esi\n\t" | |
22 | "cmpb $0,-1(%%eax)\n\t" | |
23 | "jne 1b\n\t" | |
24 | "xorl %%eax,%%eax\n\t" | |
25 | "2:" | |
209b580f PC |
26 | : "=a" (__res), "=&c" (d0), "=&S" (d1) |
27 | : "0" (0), "1" (0xffffffff), "2" (cs), "g" (ct) | |
28 | : "dx", "di"); | |
1da177e4 LT |
29 | return __res; |
30 | } | |
31 |