BSD 4_1c_2 release

[unix-history] / usr / src / ucb / printenv.c

static char *sccsid = "@(#)printenv.c   4.1 (Berkeley) 10/2/80";
/*
* printenv
*
* Bill Joy, UCB
* February, 1979
*/

extern  char **environ;

main(argc, argv)
       int argc;
       char *argv[];
{
       register char **ep;
       int found = 0;

       argc--, argv++;
       if (environ)
               for (ep = environ; *ep; ep++)
                       if (argc == 0 || prefix(argv[0], *ep)) {
                               register char *cp = *ep;

                               found++;
                               if (argc) {
                                       while (*cp && *cp != '=')
                                               cp++;
                                       if (*cp == '=')
                                               cp++;
                               }
                               printf("%s\n", cp);
                       }
       exit (!found);
}

prefix(cp, dp)
       char *cp, *dp;
{

       while (*cp && *dp && *cp == *dp)
               cp++, dp++;
       if (*cp == 0)
               return (*dp == '=');
       return (0);
}