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  6. <title>Strings (The Red Hat newlib C Library)</title>
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  47. <a name="Strings"></a>
  48. <div class="header">
  49. <p>
  50. Next: <a href="Wchar-strings.html#Wchar-strings" accesskey="n" rel="next">Wchar strings</a>, Previous: <a href="Stdio.html#Stdio" accesskey="p" rel="prev">Stdio</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
  51. </div>
  52. <hr>
  53. <a name="Strings-and-Memory-_0028string_002eh_0029"></a>
  54. <h2 class="chapter">5 Strings and Memory (<samp>string.h</samp>)</h2>
  55. <p>This chapter describes string-handling functions and functions for
  56. managing areas of memory. The corresponding declarations are in
  57. <samp>string.h</samp>.
  58. </p>
  59. <table class="menu" border="0" cellspacing="0">
  60. <tr><td align="left" valign="top">&bull; <a href="bcmp.html#bcmp" accesskey="1">bcmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compare two memory areas
  61. </td></tr>
  62. <tr><td align="left" valign="top">&bull; <a href="bcopy.html#bcopy" accesskey="2">bcopy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Copy memory regions
  63. </td></tr>
  64. <tr><td align="left" valign="top">&bull; <a href="bzero.html#bzero" accesskey="3">bzero</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Initialize memory to zero
  65. </td></tr>
  66. <tr><td align="left" valign="top">&bull; <a href="index.html#index" accesskey="4">index</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Search for character in string
  67. </td></tr>
  68. <tr><td align="left" valign="top">&bull; <a href="memccpy.html#memccpy" accesskey="5">memccpy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Copy memory regions up to end-token
  69. </td></tr>
  70. <tr><td align="left" valign="top">&bull; <a href="memchr.html#memchr" accesskey="6">memchr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find character in memory
  71. </td></tr>
  72. <tr><td align="left" valign="top">&bull; <a href="memcmp.html#memcmp" accesskey="7">memcmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compare two memory areas
  73. </td></tr>
  74. <tr><td align="left" valign="top">&bull; <a href="memcpy.html#memcpy" accesskey="8">memcpy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Copy memory regions
  75. </td></tr>
  76. <tr><td align="left" valign="top">&bull; <a href="memmem.html#memmem" accesskey="9">memmem</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find memory segment
  77. </td></tr>
  78. <tr><td align="left" valign="top">&bull; <a href="memmove.html#memmove">memmove</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Move possibly overlapping memory
  79. </td></tr>
  80. <tr><td align="left" valign="top">&bull; <a href="mempcpy.html#mempcpy">mempcpy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Copy memory regions and locate end
  81. </td></tr>
  82. <tr><td align="left" valign="top">&bull; <a href="memrchr.html#memrchr">memrchr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Reverse search for character in memory
  83. </td></tr>
  84. <tr><td align="left" valign="top">&bull; <a href="memset.html#memset">memset</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Set an area of memory
  85. </td></tr>
  86. <tr><td align="left" valign="top">&bull; <a href="rawmemchr.html#rawmemchr">rawmemchr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find character in memory
  87. </td></tr>
  88. <tr><td align="left" valign="top">&bull; <a href="rindex.html#rindex">rindex</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Reverse search for character in string
  89. </td></tr>
  90. <tr><td align="left" valign="top">&bull; <a href="stpcpy.html#stpcpy">stpcpy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Copy string returning a pointer to its end
  91. </td></tr>
  92. <tr><td align="left" valign="top">&bull; <a href="stpncpy.html#stpncpy">stpncpy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Counted copy string returning a pointer to its end
  93. </td></tr>
  94. <tr><td align="left" valign="top">&bull; <a href="strcasecmp.html#strcasecmp">strcasecmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compare strings ignoring case
  95. </td></tr>
  96. <tr><td align="left" valign="top">&bull; <a href="strcasestr.html#strcasestr">strcasestr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find string segment ignoring case
  97. </td></tr>
  98. <tr><td align="left" valign="top">&bull; <a href="strcat.html#strcat">strcat</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Concatenate strings
  99. </td></tr>
  100. <tr><td align="left" valign="top">&bull; <a href="strchr.html#strchr">strchr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Search for character in string
  101. </td></tr>
  102. <tr><td align="left" valign="top">&bull; <a href="strchrnul.html#strchrnul">strchrnul</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Search for character in string
  103. </td></tr>
  104. <tr><td align="left" valign="top">&bull; <a href="strcmp.html#strcmp">strcmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Character string compare
  105. </td></tr>
  106. <tr><td align="left" valign="top">&bull; <a href="strcoll.html#strcoll">strcoll</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Locale-specific character string compare
  107. </td></tr>
  108. <tr><td align="left" valign="top">&bull; <a href="strcpy.html#strcpy">strcpy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Copy string
  109. </td></tr>
  110. <tr><td align="left" valign="top">&bull; <a href="strcspn.html#strcspn">strcspn</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Count chars not in string
  111. </td></tr>
  112. <tr><td align="left" valign="top">&bull; <a href="strerror.html#strerror">strerror</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Convert error number to string (strerror, strerror_l)
  113. </td></tr>
  114. <tr><td align="left" valign="top">&bull; <a href="strerror_005fr.html#strerror_005fr">strerror_r</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Convert error number to string
  115. </td></tr>
  116. <tr><td align="left" valign="top">&bull; <a href="strlen.html#strlen">strlen</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Character string length
  117. </td></tr>
  118. <tr><td align="left" valign="top">&bull; <a href="strlwr.html#strlwr">strlwr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Convert string to lowercase
  119. </td></tr>
  120. <tr><td align="left" valign="top">&bull; <a href="strncasecmp.html#strncasecmp">strncasecmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compare strings ignoring case
  121. </td></tr>
  122. <tr><td align="left" valign="top">&bull; <a href="strncat.html#strncat">strncat</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Concatenate strings
  123. </td></tr>
  124. <tr><td align="left" valign="top">&bull; <a href="strncmp.html#strncmp">strncmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Character string compare
  125. </td></tr>
  126. <tr><td align="left" valign="top">&bull; <a href="strncpy.html#strncpy">strncpy</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Counted copy string
  127. </td></tr>
  128. <tr><td align="left" valign="top">&bull; <a href="strnstr.html#strnstr">strnstr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find string segment
  129. </td></tr>
  130. <tr><td align="left" valign="top">&bull; <a href="strnlen.html#strnlen">strnlen</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Character string length
  131. </td></tr>
  132. <tr><td align="left" valign="top">&bull; <a href="strpbrk.html#strpbrk">strpbrk</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find chars in string
  133. </td></tr>
  134. <tr><td align="left" valign="top">&bull; <a href="strrchr.html#strrchr">strrchr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Reverse search for character in string
  135. </td></tr>
  136. <tr><td align="left" valign="top">&bull; <a href="strsignal.html#strsignal">strsignal</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Return signal message string
  137. </td></tr>
  138. <tr><td align="left" valign="top">&bull; <a href="strspn.html#strspn">strspn</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find initial match
  139. </td></tr>
  140. <tr><td align="left" valign="top">&bull; <a href="strstr.html#strstr">strstr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Find string segment
  141. </td></tr>
  142. <tr><td align="left" valign="top">&bull; <a href="strtok.html#strtok">strtok</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Get next token from a string
  143. </td></tr>
  144. <tr><td align="left" valign="top">&bull; <a href="strupr.html#strupr">strupr</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Convert string to upper case
  145. </td></tr>
  146. <tr><td align="left" valign="top">&bull; <a href="strverscmp.html#strverscmp">strverscmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compare version strings
  147. </td></tr>
  148. <tr><td align="left" valign="top">&bull; <a href="strxfrm.html#strxfrm">strxfrm</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Transform string
  149. </td></tr>
  150. <tr><td align="left" valign="top">&bull; <a href="swab.html#swab">swab</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Swap adjacent bytes
  151. </td></tr>
  152. <tr><td align="left" valign="top">&bull; <a href="wcscasecmp.html#wcscasecmp">wcscasecmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compare wide character strings ignoring case
  153. </td></tr>
  154. <tr><td align="left" valign="top">&bull; <a href="wcsdup.html#wcsdup">wcsdup</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Wide character string duplicate
  155. </td></tr>
  156. <tr><td align="left" valign="top">&bull; <a href="wcsncasecmp.html#wcsncasecmp">wcsncasecmp</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Compare wide character strings ignoring case
  157. </td></tr>
  158. </table>
  159. <hr>
  160. <div class="header">
  161. <p>
  162. Next: <a href="Wchar-strings.html#Wchar-strings" accesskey="n" rel="next">Wchar strings</a>, Previous: <a href="Stdio.html#Stdio" accesskey="p" rel="prev">Stdio</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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