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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/i386/lib/strstr.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/i386/lib/strstr.c')
-rw-r--r--arch/i386/lib/strstr.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/i386/lib/strstr.c b/arch/i386/lib/strstr.c
new file mode 100644
index 000000000000..a3dafbf59dae
--- /dev/null
+++ b/arch/i386/lib/strstr.c
@@ -0,0 +1,31 @@
1#include <linux/string.h>
2
3char * strstr(const char * cs,const char * ct)
4{
5int d0, d1;
6register char * __res;
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:"
26 :"=a" (__res), "=&c" (d0), "=&S" (d1)
27 :"0" (0), "1" (0xffffffff), "2" (cs), "g" (ct)
28 :"dx", "di");
29return __res;
30}
31