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/* setusershell(), getusershell(), endusershell() for uClibc.
*
* Copyright (C) 2010 Bernhard Reutner-Fischer <uclibc@uclibc.org>
*
* Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in
* this tarball.
*/
/* My manpage reads:
* The getusershell() function returns the next line from the file
* /etc/shells, opening the file if necessary. The line should contain
* the pathname of a valid user shell. If /etc/shells does not exist
* or is unreadable, getusershell() behaves as if /bin/sh and /bin/csh
* were listed in the file.
* The getusershell() function returns a NULL pointer on end-of-file.
*/
#include <unistd.h>
#include <stdlib.h>
#include <paths.h>
#include <string.h>
#include "internal/parse_config.h"
#if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
static const char * const defaultsh[] = { _PATH_BSHELL, _PATH_CSHELL, NULL};
static char *shellb, **shells;
static parser_t *shellp;
void endusershell(void)
{
if (shellp) {
shells = (char**) shellb;
while (shells && *shells) {
char*xxx = *shells++;
free(xxx);
}
config_close(shellp);
shellp = NULL;
}
free(shellb);
shellb = NULL;
shells = NULL;
}
void setusershell(void)
{
endusershell();
shellp = config_open(_PATH_SHELLS);
if (shellp == NULL)
shells = (char **)defaultsh;
else {
char **shell = NULL;
int pos = 0;
while (config_read(shellp, &shell, 1, 1, "# \t", PARSE_NORMAL))
{
shellb = realloc(shellb, (pos + 2) * sizeof(char*));
shells = (char**) shellb + pos++;
*shells++ = strdup(*shell);
*shells = NULL;
}
shells = (char **)shellb;
}
}
char *getusershell(void)
{
char *sh;
if (shells == NULL)
setusershell();
sh = *shells;
if (sh)
shells++;
return sh;
}
#endif
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