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Minix/2.0.0/wwwman/man3/string.3.html
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Minix/2.0.0/wwwman/man3/string.3.html
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<HTML>
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<HEAD>
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<TITLE>string(3)</TITLE>
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</HEAD>
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<BODY>
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<H1>string(3)</H1>
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<HR>
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<PRE>
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</PRE>
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<H2>NAME</H2><PRE>
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string, strcat, strncat, strcmp, strncmp, strcpy, strncpy, strlen, index,
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rindex - string operations string, strcat, strncat, strcmp, strncmp,
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strcpy, strncpy, strlen, strchr, strrchr, strerror, memcmp, memcpy,
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memmove, memchr, memset, index, rindex - string operations
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<STRONG>#include</STRONG> <STRONG><sys/types.h></STRONG>
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<STRONG>#include</STRONG> <STRONG><strings.h></STRONG>
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<STRONG>char</STRONG> <STRONG>*strcat(char</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*strncat(char</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>int</STRONG> <STRONG>strcmp(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>)</STRONG>
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<STRONG>int</STRONG> <STRONG>strncmp(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*strcpy(char</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*strncpy(char</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>size_t</STRONG> <STRONG>strlen(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*strchr(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*strrchr(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*strerror(int</STRONG> <EM>errnum</EM><STRONG>)</STRONG>
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<STRONG>int</STRONG> <STRONG>memcmp(const</STRONG> <STRONG>void</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>void</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>void</STRONG> <STRONG>*memcpy(void</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>void</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>void</STRONG> <STRONG>*memmove(void</STRONG> <STRONG>*</STRONG><EM>s1</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>void</STRONG> <STRONG>*</STRONG><EM>s2</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>void</STRONG> <STRONG>*memchr(const</STRONG> <STRONG>void</STRONG> <STRONG>*</STRONG><EM>s</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>void</STRONG> <STRONG>*memset(void</STRONG> <STRONG>*</STRONG><EM>s</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>,</STRONG> <STRONG>size_t</STRONG> <EM>n</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*index(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>)</STRONG>
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<STRONG>char</STRONG> <STRONG>*rindex(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>s</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>)</STRONG>
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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These functions operate on null-terminated strings. They do not check
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for overflow of any receiving string.
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<STRONG>Strcat</STRONG> appends a copy of string <EM>s2</EM> to the end of string <EM>s1</EM>. <STRONG>Strncat</STRONG>
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copies at most <EM>n</EM> characters. Both return a pointer to the null-
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terminated result.
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<STRONG>Strcmp</STRONG> compares its arguments and returns an integer greater than, equal
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to, or less than 0, according as <EM>s1</EM> is lexicographically greater than,
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equal to, or less than <EM>s2</EM>. <STRONG>Strncmp</STRONG> makes the same comparison but looks
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at at most <EM>n</EM> characters.
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<STRONG>Strcpy</STRONG> copies string <EM>s2</EM> to <EM>s1</EM>, stopping after the null character has been
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moved. <STRONG>Strncpy</STRONG> copies exactly <EM>n</EM> characters, truncating or null-padding
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<EM>s2</EM>; the target may not be null-terminated if the length of <EM>s2</EM> is <EM>n</EM> or
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more. Both return <EM>s1</EM>.
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<STRONG>Strlen</STRONG> returns the number of non-null characters in <EM>s</EM>.
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<STRONG>Strchr</STRONG> (<STRONG>strrchr</STRONG>) returns a pointer to the first (last) occurrence of
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character <EM>c</EM> in string <EM>s</EM>, or null if <EM>c</EM> does not occur in the string.
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<STRONG>Strerror</STRONG> returns the error string for the system call error <EM>errnum</EM>. See
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<STRONG><A HREF="../man2/intro.2.html">intro(2)</A></STRONG>.
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<STRONG>Memcmp</STRONG> is like <STRONG>strcmp</STRONG> except that the strings are memory blocks of length
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<EM>n</EM>. Null characters are treated as ordinary characters.
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<STRONG>Memcpy</STRONG> copies <EM>n</EM> bytes from the location pointed to by <EM>s2</EM> to <EM>s1</EM>. <STRONG>Memmove</STRONG>
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is like memcpy, except that it can handle overlap between the two
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strings. Both functions return <EM>s1</EM>.
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<STRONG>Memchr</STRONG> returns a pointer to the first occurrence of character <EM>c</EM> in string
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<EM>s</EM>, or null if <EM>c</EM> does not occur in the string.
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<STRONG>Memset</STRONG> sets <EM>n</EM> bytes to <EM>c</EM> starting at location <EM>s</EM>. It returns <EM>s</EM>.
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<STRONG>Index</STRONG> and <STRONG>rindex</STRONG> are obsolete versions of <STRONG>strchr</STRONG> and <STRONG>strrchr</STRONG>. New code
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should avoid using them.
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</PRE>
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<H2>NOTES</H2><PRE>
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Characters are compared as <STRONG>unsigned</STRONG> <STRONG>char</STRONG>, whether <STRONG>char</STRONG> itself is signed
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or not.
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</PRE>
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</BODY>
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</HTML>
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