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annotate tests/test-obstack-printf.c @ 10207:e027c5e42aba

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Improve obstack-printf test code. * tests/test-obstack-printf.c (test_function): Fix comment, and simplify usage of obstack_* in macros. Add a test for coverage. Reported by Bruno Haible. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Sat, 14 Jun 2008 07:36:03 -0600
parents 3384541effec
children cee1ca4b9566
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10205
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1 /* Test of obstack_printf() and obstack_vprintf() functions.
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2 Copyright (C) 2008 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 /* Written by Eric Blake <ebb9@byu.net>, 2008. */
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18
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19 #include <config.h>
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20
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21 #include <stdio.h>
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22
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23 #include "obstack.h"
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24 #include "xalloc.h"
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25
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26 #include <stdarg.h>
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27 #include <stdlib.h>
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28 #include <string.h>
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29
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30 #define ASSERT(expr) \
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31 do \
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32 { \
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33 if (!(expr)) \
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34 { \
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35 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
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36 fflush (stderr); \
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37 abort (); \
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38 } \
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39 } \
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40 while (0)
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41
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42 #define obstack_chunk_alloc xmalloc
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43 #define obstack_chunk_free free
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44
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45 static void
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46 test_function (int (*my_obstack_printf) (struct obstack *, const char *, ...))
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47 {
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48 struct obstack obs;
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49 obstack_init (&obs);
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50 /* In general, be careful that arguments to obstack_* don't have
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51 side effects, as not all compilers evaluate macro arguments only
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52 once. */
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53
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54 /* Grow the obstack to near its boundary, then check that short
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55 output longer than the obstack free space grows the obstack. */
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56 {
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57 char *base = obstack_base (&obs);
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58 char *new_base;
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59 int result;
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60 int room = obstack_room (&obs) - 4;
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61
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62 obstack_blank_fast (&obs, room);
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63 result = my_obstack_printf (&obs, "%d %s", 123, "456");
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64 ASSERT (result == 7);
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65 ASSERT (result + room == obstack_object_size (&obs));
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66 obstack_1grow (&obs, 0);
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67 new_base = obstack_finish (&obs);
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68 ASSERT (base != new_base);
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69 ASSERT (strcmp (new_base + room, "123 456") == 0);
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70 }
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71
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72 /* Check that strings shorter than the obstack free space don't
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73 cause a reshuffling of the obstack. */
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74 {
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75 char *base = obstack_base (&obs);
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76 char *new_base;
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77 int result;
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78 int room = obstack_room (&obs);
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79
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80 ASSERT (8 < room);
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81 result = my_obstack_printf (&obs, "%d %s", 123, "456");
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82 ASSERT (result == 7);
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83 ASSERT (result == obstack_object_size (&obs));
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84 new_base = obstack_base (&obs);
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85 ASSERT (base == new_base);
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86 ASSERT (strncmp (base, "123 456", result) == 0);
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87 obstack_finish (&obs);
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88 }
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89
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90 /* Check for generating much more output than a chunk size. */
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91 {
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92 char *base = obstack_base (&obs);
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93 char *new_base;
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94 int result;
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95 int i;
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96
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97 ASSERT (obstack_chunk_size (&obs) < 10000);
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98 result = my_obstack_printf (&obs, "%010000d", 0);
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99 ASSERT (result == 10000);
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100 ASSERT (result == obstack_object_size (&obs));
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101 new_base = obstack_base (&obs);
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102 ASSERT (base != new_base);
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103 for (i = 0; i < 10000; i++)
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104 ASSERT (new_base[i] == '0');
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105 }
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106
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107 obstack_free (&obs, NULL);
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108 }
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109
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110 static int
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111 my_obstack_printf (struct obstack *obs, const char *format, ...)
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112 {
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113 va_list args;
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114 int ret;
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115
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116 va_start (args, format);
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117 ret = obstack_vprintf (obs, format, args);
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118 va_end (args);
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119 return ret;
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120 }
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121
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122 static void
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123 test_obstack_vprintf ()
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124 {
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125 test_function (my_obstack_printf);
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126 }
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127
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128 static void
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129 test_obstack_printf ()
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130 {
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131 test_function (obstack_printf);
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132 }
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133
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134 int
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135 main (int argc, char *argv[])
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136 {
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137 test_obstack_vprintf ();
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138 test_obstack_printf ();
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139 return 0;
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140 }