tests/test-vasnprintf.c

   1 /* Test of vasnprintf() and asnprintf() functions.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include "vasnprintf.h"
  22
  23 #include <stdarg.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "macros.h"
  28
  29 static void
  30 test_function (char * (*my_asnprintf) (char *, size_t *, const char *, ...))
  31 {
  32   char buf[8];
  33   int size;
  34
  35   for (size = 0; size <= 8; size++)
  36     {
  37       size_t length = size;
  38       char *result = my_asnprintf (NULL, &length, "%d", 12345);
  39       ASSERT (result != NULL);
  40       ASSERT (strcmp (result, "12345") == 0);
  41       ASSERT (length == 5);
  42       free (result);
  43     }
  44
  45   for (size = 0; size <= 8; size++)
  46     {
  47       size_t length;
  48       char *result;
  49
  50       memcpy (buf, "DEADBEEF", 8);
  51       length = size;
  52       result = my_asnprintf (buf, &length, "%d", 12345);
  53       ASSERT (result != NULL);
  54       ASSERT (strcmp (result, "12345") == 0);
  55       ASSERT (length == 5);
  56       if (size < 5 + 1)
  57         ASSERT (result != buf);
  58       ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
  59       if (result != buf)
  60         free (result);
  61     }
  62
  63   /* Note: This test assumes IEEE 754 representation of 'double' floats.  */
  64   for (size = 0; size <= 8; size++)
  65     {
  66       size_t length;
  67       char *result;
  68
  69       memcpy (buf, "DEADBEEF", 8);
  70       length = size;
  71       result = my_asnprintf (buf, &length, "%2.0f", 1.6314159265358979e+125);
  72       ASSERT (result != NULL);
  73       /* The exact result and the result on glibc systems is
  74          163141592653589790215729350939528493057529598899734151772468186268423257777068536614838678161083520756952076273094236944990208
  75          On Cygwin, the result is
  76          163141592653589790215729350939528493057529600000000000000000000000000000000000000000000000000000000000000000000000000000000000
  77          On HP-UX 11.31 / hppa and IRIX 6.5, the result is
  78          163141592653589790000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
  79        */
  80       ASSERT (strlen (result) == 126);
  81       ASSERT (memcmp (result, "163141592653589790", 18) == 0);
  82       ASSERT (length == 126);
  83       if (size < 126 + 1)
  84         ASSERT (result != buf);
  85       ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
  86       if (result != buf)
  87         free (result);
  88     }
  89 }
  90
  91 static char *
  92 my_asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...)
  93 {
  94   va_list args;
  95   char *ret;
  96
  97   va_start (args, format);
  98   ret = vasnprintf (resultbuf, lengthp, format, args);
  99   va_end (args);
 100   return ret;
 101 }
 102
 103 static void
 104 test_vasnprintf ()
 105 {
 106   test_function (my_asnprintf);
 107 }
 108
 109 static void
 110 test_asnprintf ()
 111 {
 112   test_function (asnprintf);
 113 }
 114
 115 int
 116 main ()
 117 {
 118   test_vasnprintf ();
 119   test_asnprintf ();
 120   return test_exit_status;
 121 }