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/*
* getgrent.c -- simulate getgrent(), setgrent(), endgrent()
*/
#define __USE_XOPEN
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <grp.h>
static struct group entries[] = {
{ .gr_name = (char *) "root", .gr_passwd = (char *) "x",
.gr_gid = 0, .gr_mem = NULL },
{ .gr_name = (char *) "fsgqa", .gr_passwd = (char *) "x",
.gr_gid = 31415, .gr_mem = NULL },
{ .gr_name = NULL, .gr_passwd = NULL, .gr_gid = 0, .gr_mem = NULL },
};
static struct group *current_grp;
struct group *getgrent(void)
{
if (current_grp == NULL)
current_grp = entries;
if (current_grp->gr_name == NULL) {
return NULL;
}
return current_grp++;
}
void setgrent(void)
{
current_grp = NULL;
}
void endgrent(void)
{
current_grp = NULL;
}
#ifdef DEBUG
struct group *getgrnam(const char *name)
{
struct group *cur;
setgrent();
while ((cur = getgrent()) != NULL) {
if (strcmp(name, cur->gr_name) == 0)
return cur;
}
return NULL;
}
struct group *getgrgid(gid_t gid)
{
struct group *cur;
setgrent();
while ((cur = getgrent()) != NULL) {
if (gid == cur->gr_gid)
return cur;
}
return NULL;
}
static void print_group(struct group *grp)
{
if (grp == NULL)
printf("NULL entry\n");
else
printf("%s:%s:%d\n", grp->gr_name,
grp->gr_passwd, grp->gr_gid);
}
int main(int argc, char **argv)
{
struct group *grp;
int err;
grp = getgrnam("root");
print_group(grp);
if (!grp)
err++;
grp = getgrnam("fsgqa");
print_group(grp);
if (!grp)
err++;
grp = getgrnam("foo");
print_group(grp);
if (grp)
err++;
grp = getgrgid(0);
print_group(grp);
if (!grp)
err++;
grp = getgrgid(31415);
print_group(grp);
if (!grp)
err++;
grp = getgrgid(42);
print_group(grp);
if (grp)
err++;
if (err)
printf("Failed!\n");
else
printf("Succeeded!\n");
return err;
}
#endif
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