mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
44 lines
1011 B
C
44 lines
1011 B
C
/* Simple implementation of strstr for systems without it.
|
|
This function is in the public domain. */
|
|
|
|
/*
|
|
|
|
@deftypefn Supplemental char* strstr (const char *@var{string}, const char *@var{sub})
|
|
|
|
This function searches for the substring @var{sub} in the string
|
|
@var{string}, not including the terminating null characters. A pointer
|
|
to the first occurrence of @var{sub} is returned, or @code{NULL} if the
|
|
substring is absent. If @var{sub} points to a string with zero
|
|
length, the function returns @var{string}.
|
|
|
|
@end deftypefn
|
|
|
|
|
|
*/
|
|
|
|
|
|
/* FIXME: The above description is ANSI compiliant. This routine has not
|
|
been validated to comply with it. -fnf */
|
|
|
|
char *
|
|
strstr (s1, s2)
|
|
char *s1, *s2;
|
|
{
|
|
register char *p = s1;
|
|
extern char *strchr ();
|
|
extern int strncmp ();
|
|
#if __GNUC__ >= 2
|
|
extern __SIZE_TYPE__ strlen (const char *);
|
|
#endif
|
|
register int len = strlen (s2);
|
|
|
|
for (; (p = strchr (p, *s2)) != 0; p++)
|
|
{
|
|
if (strncmp (p, s2, len) == 0)
|
|
{
|
|
return (p);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|