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/*
* strstr -- locate first occurence of a substring
*
* Locates the first occurrence in the string pointed to by S1 of the string
* pointed to by S2. Returns a pointer to the substring found, or a NULL
* pointer if not found. If S2 points to a string with zero length, the
* function returns S1.
*
* For license terms, see the file COPYING in this directory.
*/
char *strstr(register char *buf, register char *sub)
{
register char *bp;
if (!*sub)
return buf;
for (;;)
{
if (!*buf)
break;
bp = buf;
for (;;)
{
if (!*sub)
return buf;
if (*bp++ != *sub++)
break;
}
sub -= (unsigned long) bp;
sub += (unsigned long) buf;
buf += 1;
}
return 0;
}
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