check return value from socket call

[unix-history] / usr / src / lib / libc / string / strsep.c

/*
* Copyright (c) 1988 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strsep.c    5.2 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <stdio.h>

char *
strsep(s, delim)
       register char *s, *delim;
{
       register char *spanp;
       register int c, sc;
       static char *last;
       char *tok;

       if (s == NULL && (s = last) == NULL)
               return(NULL);

       /*
        * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
        * Note that delim must have one NUL; we stop if we see that, too.
        */
       for (tok = s;; ++s) {
               c = *s;
               spanp = delim;
               do {
                       if ((sc = *spanp++) == c) {
                               if (c == 0) {
                                       last = NULL;
                                       return(tok);
                               }
                               *s++ = '\0';
                               last = s;
                               return(tok);
                       }
               } while (sc);
       }
       /* NOTREACHED */
}