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 #include <stddef.h>
  21
  22 /* write() */
  23 #include <unistd.h>
  24
  25 /* send() */
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28
  29 #include <errno.h>
  30
  31 #include <share.h>
  32
  33 /*
  34  * This write is patient because it restarts if it was incomplete.
  35  */
  36
  37 ssize_t patient_write(int fd, const void *buf, size_t count)
  38 {
  39         const char *bufc = (const char *) buf;
  40         int result;
  41
  42         for(;;) {
  43                 result = write(fd, bufc, count);
  44                 if (result == -1 && errno == EINTR) {
  45                         continue;
  46                 }
  47                 if (result <= 0) {
  48                         return result;
  49                 }
  50                 count -= result;
  51                 bufc += result;
  52
  53                 if (count == 0) {
  54                         break;
  55                 }
  56         }
  57
  58         return bufc-(const char *)buf;
  59 }
  60
  61 ssize_t patient_send(int fd, const void *buf, size_t count, int flags)
  62 {
  63         const char *bufc = (const char *) buf;
  64         int result;
  65
  66         for(;;) {
  67                 result = send(fd, bufc, count, flags);
  68                 if (result == -1 && errno == EINTR) {
  69                         continue;
  70                 }
  71                 if (result <= 0) {
  72                         return result;
  73                 }
  74                 count -= result;
  75                 bufc += result;
  76
  77                 if (count == 0) {
  78                         break;
  79                 }
  80         }
  81
  82         return bufc - (const char *) buf;
  83 }