33 lines
565 B
C
33 lines
565 B
C
#define _GNU_SOURCE
|
|
#include <stdio.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)
|
|
{
|
|
ssize_t l;
|
|
if (!f) setusershell();
|
|
if (!f) return 0;
|
|
l = getline(&line, &linesize, f);
|
|
if (l <= 0) return 0;
|
|
if (line[l-1]=='\n') line[l-1]=0;
|
|
return line;
|
|
}
|