iconvdata/tst-e2big.c

   1 /* Test for a tricky E2BIG situation.
   2    Copyright (C) 2002-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C 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    The GNU C 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 the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <alloca.h>
  20 #include <errno.h>
  21 #include <iconv.h>
  22 #include <stdbool.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25
  26 /* In EUC-JISX0213 and TSCII, a single input character can convert to
  27    a sequence of two or more Unicode characters.  When the output buffer
  28    has room for less Unicode characters than would be produced with an
  29    unconstrained output buffer, the conversion must give errno = E2BIG.  */
  30
  31 void
  32 test (const char *encoding, char *inbuf, size_t inbufsize, size_t outbufsize)
  33 {
  34   char *outbuf = alloca (outbufsize);
  35   iconv_t cd;
  36   char *inptr;
  37   size_t inlen;
  38   char *outptr;
  39   size_t outlen;
  40   int result;
  41   bool empty_input;
  42   bool empty_output;
  43
  44   cd = iconv_open ("UTF-8", encoding);
  45   if (cd == (iconv_t) -1)
  46     {
  47       fprintf (stderr, "cannot convert from %s\n", encoding);
  48       exit (1);
  49     }
  50
  51   inptr = inbuf;
  52   inlen = inbufsize;
  53   outptr = outbuf;
  54   outlen = outbufsize;
  55
  56   result = iconv (cd, &inptr, &inlen, &outptr, &outlen);
  57   if (!(result == -1 && errno == E2BIG))
  58     {
  59       fprintf (stderr, "%s: wrong iconv result: %d/%d (%m)\n",
  60                encoding, result, errno);
  61       exit (1);
  62     }
  63   empty_input = (inptr == inbuf && inlen == inbufsize);
  64   empty_output = (outptr == outbuf && outlen == outbufsize);
  65
  66   if (!empty_input && empty_output)
  67     {
  68       fprintf (stderr, "%s: ate %td input bytes\n", encoding, inptr - inbuf);
  69       exit (1);
  70     }
  71   if (empty_input && !empty_output)
  72     {
  73       fprintf (stderr, "%s: produced %td output bytes\n",
  74                encoding, outptr - outbuf);
  75       exit (1);
  76     }
  77
  78   iconv_close (cd);
  79 }
  80
  81 void
  82 test_euc_jisx0213 (void)
  83 {
  84   char inbuf[2] = { 0xa4, 0xf7 };
  85   test ("EUC-JISX0213", inbuf, sizeof (inbuf), 3);
  86 }
  87
  88 void
  89 test_tscii (void)
  90 {
  91   char inbuf[1] = { 0x82 };
  92   test ("TSCII", inbuf, sizeof (inbuf), 3);
  93   test ("TSCII", inbuf, sizeof (inbuf), 6);
  94   test ("TSCII", inbuf, sizeof (inbuf), 9);
  95 }
  96
  97 static int
  98 do_test (void)
  99 {
 100   test_euc_jisx0213 ();
 101   test_tscii ();
 102   return 0;
 103 }
 104
 105 #define TEST_FUNCTION do_test ()
 106 #include "../test-skeleton.c"