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<title>Strings (The Red Hat newlib C Library)</title>

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<a name="Strings"></a>
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<p>
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>
</div>
<hr>
<a name="Strings-and-Memory-_0028string_002eh_0029"></a>
<h2 class="chapter">5 Strings and Memory (<samp>string.h</samp>)</h2>

<p>This chapter describes string-handling functions and functions for
managing areas of memory.  The corresponding declarations are in
<samp>string.h</samp>.
</p>
<table class="menu" border="0" cellspacing="0">
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
<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
</td></tr>
</table>

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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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