service_runtime/gprintf.c

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NaCl Generic I/O interface.
  34  */
  35 #include "native_client/include/portability.h"
  36
  37 #include <stdlib.h>
  38
  39 #include "native_client/service_runtime/gio.h"
  40
  41 int gvprintf(struct Gio *gp,
  42              char       *fmt,
  43              va_list    ap)
  44 {
  45   size_t  bufsz = 1024;
  46   char    *buf = malloc(bufsz);
  47   int     rv;
  48
  49   if (!buf) return -1;
  50
  51   while ((rv = vsnprintf(buf, bufsz, fmt, ap)) < 0 || (unsigned) rv >= bufsz) {
  52     free(buf);
  53     bufsz *= 2;
  54     buf = malloc(bufsz);
  55     if (!buf) {
  56       return -1;
  57     }
  58   }
  59   if (rv >= 0) {
  60     rv = (*gp->vtbl->Write)(gp, buf, rv);
  61   }
  62   free(buf);
  63
  64   return rv;
  65 }
  66
  67 int gprintf(struct Gio  *gp,
  68             char        *fmt, ...)
  69 {
  70   va_list ap;
  71   int     rv;
  72
  73   va_start(ap, fmt);
  74   rv = gvprintf(gp, fmt, ap);
  75   va_end(ap);
  76
  77   return rv;
  78 }