1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
| | #define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static const char defshells[] = "/bin/sh\n/bin/csh\n";
static char *line;
static size_t linesize;
static FILE *f;
void endusershell(void)
{
if (f) fclose(f);
f = 0;
}
void setusershell(void)
{
if (!f) f = fopen("/etc/shells", "rbe");
if (!f) f = fmemopen((void *)defshells, sizeof defshells - 1, "rb");
}
char *getusershell(void)
{
if (!f) setusershell();
if (!f) return 0;
do {
ssize_t l = getline(&line, &linesize, f);
if (l <= 0) return 0;
} while (line[0] != '/');
line[strcspn(line, "#\n")] = 0;
return line;
}
|