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#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;
do {
l = getline(&line, &linesize, f);
if (l <= 0) return 0;
} while (line[0] == '#' || line[0] == '\n');
if (line[l-1]=='\n') line[l-1]=0;
return line;
}
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