src/stdio/fgetln.c

   1 #define _GNU_SOURCE
   2 #include "stdio_impl.h"
   3 #include <string.h>
   4
   5 char *fgetln(FILE *f, size_t *plen)
   6 {
   7         char *ret = 0, *z;
   8         ssize_t l;
   9         FLOCK(f);
  10         ungetc(getc_unlocked(f), f);
  11         if (f->rend && (z=memchr(f->rpos, '\n', f->rend - f->rpos))) {
  12                 ret = (char *)f->rpos;
  13                 *plen = ++z - ret;
  14                 f->rpos = (void *)z;
  15         } else if ((l = getline(&f->getln_buf, (size_t[]){0}, f)) > 0) {
  16                 *plen = l;
  17                 ret = f->getln_buf;
  18         }
  19         FUNLOCK(f);
  20         return ret;
  21 }