src/legacy/getusershell.c

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