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  53. <a name="strncmp_002d_002d_002dcharacter-string-compare"></a>
  54. <h3 class="section">5.33 <code>strncmp</code>&mdash;character string compare</h3>
  55. <a name="index-strncmp"></a>
  56. <p><strong>Synopsis</strong>
  57. </p><div class="example">
  58. <pre class="example">#include &lt;string.h&gt;
  59. int strncmp(const char *<var>a</var>, const char * <var>b</var>, size_t <var>length</var>);
  60. </pre></div>
  61. <p><strong>Description</strong><br>
  62. <code>strncmp</code> compares up to <var>length</var> characters
  63. from the string at <var>a</var> to the string at <var>b</var>.
  64. </p>
  65. <br>
  66. <p><strong>Returns</strong><br>
  67. If <code>*<var>a</var></code> sorts lexicographically after <code>*<var>b</var></code>,
  68. <code>strncmp</code> returns a number greater than zero. If the two
  69. strings are equivalent, <code>strncmp</code> returns zero. If <code>*<var>a</var></code>
  70. sorts lexicographically before <code>*<var>b</var></code>, <code>strncmp</code> returns a
  71. number less than zero.
  72. </p>
  73. <br>
  74. <p><strong>Portability</strong><br>
  75. <code>strncmp</code> is ANSI C.
  76. </p>
  77. <p><code>strncmp</code> requires no supporting OS subroutines.
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