snprintf/patient_write.c

   1 /*
   2  * Copyright (C) 2009  Pierre-Marc Fournier
   3  * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 /* write() */
  21 #include <unistd.h>
  22
  23 /* send() */
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26
  27 #include <errno.h>
  28
  29 #include <share.h>
  30
  31 /*
  32  * This write is patient because it restarts if it was incomplete.
  33  */
  34
  35 ssize_t patient_write(int fd, const void *buf, size_t count)
  36 {
  37         const char *bufc = (const char *) buf;
  38         int result;
  39
  40         for(;;) {
  41                 result = write(fd, bufc, count);
  42                 if (result == -1 && errno == EINTR) {
  43                         continue;
  44                 }
  45                 if (result <= 0) {
  46                         return result;
  47                 }
  48                 count -= result;
  49                 bufc += result;
  50
  51                 if (count == 0) {
  52                         break;
  53                 }
  54         }
  55
  56         return bufc-(const char *)buf;
  57 }
  58
  59 ssize_t patient_send(int fd, const void *buf, size_t count, int flags)
  60 {
  61         const char *bufc = (const char *) buf;
  62         int result;
  63
  64         for(;;) {
  65                 result = send(fd, bufc, count, flags);
  66                 if (result == -1 && errno == EINTR) {
  67                         continue;
  68                 }
  69                 if (result <= 0) {
  70                         return result;
  71                 }
  72                 count -= result;
  73                 bufc += result;
  74
  75                 if (count == 0) {
  76                         break;
  77                 }
  78         }
  79
  80         return bufc - (const char *) buf;
  81 }