strstr_32.c

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#include <linux/string.h>

char *strstr(const char *cs, const char *ct)
{
int d0, d1;
register char *__res;
__asm__ __volatile__(
    "movl %6,%%edi\n\t"
    "repne\n\t"
    "scasb\n\t"
    "notl %%ecx\n\t"
    "decl %%ecx\n\t"    /* NOTE! This also sets Z if searchstring='' */
    "movl %%ecx,%%edx\n"
    "1:\tmovl %6,%%edi\n\t"
    "movl %%esi,%%eax\n\t"
    "movl %%edx,%%ecx\n\t"
    "repe\n\t"
    "cmpsb\n\t"
    "je 2f\n\t"     /* also works for empty string, see above */
    "xchgl %%eax,%%esi\n\t"
    "incl %%esi\n\t"
    "cmpb $0,-1(%%eax)\n\t"
    "jne 1b\n\t"
    "xorl %%eax,%%eax\n\t"
    "2:"
    : "=a" (__res), "=&c" (d0), "=&S" (d1)
    : "0" (0), "1" (0xffffffff), "2" (cs), "g" (ct)
    : "dx", "di");
return __res;
}