File: both.c

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userv 1.2.0
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/*
 * userv - both.c
 * Useful very-low-level utility routines, used in both client and daemon.
 * These do not (and cannot) depend on infrastructure eg syscallerror,
 * because these are not the same.
 *
 * userv is
 * Copyright 1996-2017 Ian Jackson <ian@davenant.greenend.org.uk>.
 * Copyright 2000      Ben Harris <bjh21@cam.ac.uk>
 * Copyright 2016-2017 Peter Benie <pjb1008@cam.ac.uk>
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with userv; if not, see <http://www.gnu.org/licenses/>.
 */

/* Some nasty people can return 0/EOF + EINTR from stdio !
 * These functions attempt to work around this braindamage by retrying
 * the call after clearerr.  If this doesn't work then clearly your
 * libc is _completely_ fubar rather than just somewhat fubar.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

#include "config.h"
#include "both.h"

void *xmalloc(size_t s) {
  void *p;
  p= malloc(s?s:1); if (!p) syscallerror("malloc");
  return p;
}

void *xrealloc(void *p, size_t s) {
  p= realloc(p,s);
  if (!p) syscallerror("realloc");
  return p;
}

char *xstrsave(const char *s) {
  char *r;

  r= xmalloc(strlen(s)+1);
  strcpy(r,s);
  return r;
}


int working_getc(FILE *file) {
  int c;
  
  for (;;) {
    c= getc(file);
    if (c != EOF || errno != EINTR) return c;
    clearerr(file);
  }
}

size_t working_fread(void *ptr, size_t sz, FILE *file) {
  size_t done, nr;

  done= 0;
  for (;;) {
    nr= fread((char*)ptr + done, 1, sz-done, file);
    done += nr;
    if (done == sz || !ferror(file) || errno != EINTR) return done;
    clearerr(file);
  }
}