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/*
*
* Copyright (c) 1985 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getusershell.c 5.6 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */
#if defined(ultrix) || defined(_IBMR2) || defined(NEED_GETUSERSHELL)
#include <sys/param.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <ctype.h>
#include <stdio.h>
#define SHELLS "/etc/shells"
/*
* Do not add local shells here. They should be added in /etc/shells
*/
static char *okshells[] = {
"/bin/sh", "/bin/csh",
#ifdef _IBMR2
"/bin/ksh",
#endif /* _IBMR2 */
0
};
static char **shells, *strings;
static char **curshell = NULL;
extern char **initshells();
/*
* Get a list of shells from SHELLS, if it exists.
*/
char *
getusershell()
{
char *ret;
if (curshell == NULL)
curshell = initshells();
ret = *curshell;
if (ret != NULL)
curshell++;
return (ret);
}
endusershell()
{
if (shells != NULL)
free((char *)shells);
shells = NULL;
if (strings != NULL)
free(strings);
strings = NULL;
curshell = NULL;
}
setusershell()
{
curshell = initshells();
}
static char **
initshells()
{
register char **sp, *cp;
register FILE *fp;
struct stat statb;
extern char *malloc(), *calloc();
if (shells != NULL)
free((char *)shells);
shells = NULL;
if (strings != NULL)
free(strings);
strings = NULL;
if ((fp = fopen(SHELLS, "r")) == (FILE *)0)
return(okshells);
if (fstat(fileno(fp), &statb) == -1) {
(void)fclose(fp);
return(okshells);
}
if ((strings = malloc((unsigned)statb.st_size)) == NULL) {
(void)fclose(fp);
return(okshells);
}
shells = (char **)calloc((unsigned)statb.st_size / 3, sizeof (char *));
if (shells == NULL) {
(void)fclose(fp);
free(strings);
strings = NULL;
return(okshells);
}
sp = shells;
cp = strings;
while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
while (*cp != '#' && *cp != '/' && *cp != '\0')
cp++;
if (*cp == '#' || *cp == '\0')
continue;
*sp++ = cp;
while (!isspace(*cp) && *cp != '#' && *cp != '\0')
cp++;
*cp++ = '\0';
}
*sp = (char *)0;
(void)fclose(fp);
return (shells);
}
# endif /* ultrix */
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