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  53. <a name="strverscmp_002d_002d_002dversion-string-compare"></a>
  54. <h3 class="section">5.44 <code>strverscmp</code>&mdash;version string compare</h3>
  55. <a name="index-strverscmp"></a>
  56. <p><strong>Synopsis</strong>
  57. </p><div class="example">
  58. <pre class="example">#define _GNU_SOURCE
  59. #include &lt;string.h&gt;
  60. int strverscmp(const char *<var>a</var>, const char *<var>b</var>);
  61. </pre></div>
  62. <p><strong>Description</strong><br>
  63. <code>strverscmp</code> compares the string at <var>a</var> to
  64. the string at <var>b</var> in a version-logical order.
  65. </p>
  66. <br>
  67. <p><strong>Returns</strong><br>
  68. </p>
  69. <p>If <code>*<var>a</var></code> version-sorts after <code>*<var>b</var></code>, <code>strverscmp</code> returns
  70. a number greater than zero. If the two strings match, <code>strverscmp</code>
  71. returns zero. If <code>*<var>a</var></code> version-sorts before <code>*<var>b</var></code>,
  72. <code>strverscmp</code> returns a number less than zero.
  73. </p>
  74. <br>
  75. <p><strong>Portability</strong><br>
  76. <code>strverscmp</code> is a GNU extension.
  77. </p>
  78. <p><code>strverscmp</code> requires no supporting OS subroutines. It uses
  79. isdigit() from elsewhere in this library.
  80. </p>
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