src/libstddjb/openreadnclose.c


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

/* ISC license. */

#include <sys/types.h>
#include <errno.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/djbunix.h>

static ssize_t readnclose (int fd, char *s, size_t n)
{
  size_t r = allread(fd, s, n) ;
  if (errno)
  {
    int e = errno ;
    fd_close(fd) ;
    errno = e ;
    return -1 ;
  }
  fd_close(fd) ;
  if (r < n) errno = EPIPE ;
  return r ;
}

ssize_t openreadnclose (char const *file, char *s, size_t n)
{
  int fd = open_readb(file) ;
  return fd < 0 ? fd : readnclose(fd, s, n) ;
}

ssize_t openreadnclose_nb (char const *file, char *s, size_t n)
{
  int fd = open_read(file) ;
  return fd < 0 ? fd : readnclose(fd, s, n) ;
}