Re: sub string

[Carlos Pereira <carlos pehoe civil ist utl pt>]

> rindex does the same thing as strrchr.  Couldn't tell you if either one
> is POSIX off the top of my head.  They would have the advantage over
> your approach because
> a) You don't have to know how many directories deep you are.
> b) As you pointed out, strtok is destructive to the original string,
> which you may not want.

Yes, strrchr(aux, "\"); is the best approach in this case.
This is indeed a AINSI C standard function (string.h).

Just for the fun of it, it would take a bit more
to get the full solution using strtok:

srtcpy (save_string, string);
ptr = strtok (string,"\");
do {
   file = ptr;
   ptr = strtok (NULL,"\");
   } while (ptr != NULL);

Regarding rindex, I found it in /usr/include/string.h,
in the section below, so apparently this call is
recognized only in BSD-like systems.

Carlos

---------------/usr/include/string.h------------------

#if defined(__USE_BSD) || defined(__USE_XOPEN_EXTENDED)
/* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
extern void bcopy __P ((__const __ptr_t __src, __ptr_t __dest, size_t __n));

/* Set N bytes of S to 0.  */
extern void bzero __P ((__ptr_t __s, size_t __n));

/* Compare N bytes of S1 and S2 (same as memcmp).  */
extern int bcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2, size_t __n));

/* Find the first occurrence of C in S (same as strchr).  */
extern char *index __P ((__const char *__s, int __c));

/* Find the last occurrence of C in S (same as strrchr).  */
extern char *rindex __P ((__const char *__s, int __c));

/* Return the position of the first bit set in I, or 0 if none are set.
   The least-significant bit is position 1, the most-significant 32.  */
extern int ffs __P ((int __i));

/* Compare S1 and S2, ignoring case.  */
extern int __strcasecmp __P ((__const char *__s1, __const char *__s2));
extern int strcasecmp __P ((__const char *__s1, __const char *__s2));

/* Compare no more than N chars of S1 and S2, ignoring case.  */
extern int __strncasecmp __P ((__const char *__s1, __const char *__s2,
                               size_t __n));
extern int strncasecmp __P ((__const char *__s1, __const char *__s2,
                             size_t __n));
#endif /* Use BSD or X/Open Unix.  */

#ifdef  __USE_BSD
-------------------------/usr/include/string.h------------