root/arch/x86/lib/strstr_32.c

DEFINITIONS

1. strstr

#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;
}