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string(3)							     string(3)

Name
       strcasecmp,  strncasecmp,  strcat,  strncat,  strcmp,  strncmp, strcpy,
       strncpy, strlen, strchr, strrchr,  strpbrk,  strspn,  strcspn,  strstr,
       strtok, index, rindex - string operations

Syntax
       #include <strings.h>

	      or

       #include <string.h>

       strcasecmp(s1, s2)
       char *s1, *s2;

       strncasecmp(s1, s2, n)
       char *s1, *s2;

       char *strcat(s1, s2)
       char *s1, *s2;

       char *strncat(s1, s2, n)
       char *s1, *s2;

       int strcmp(s1, s2)
       unsigned char *s1, *s2;

       int strncmp(s1, s2, n)
       unsigned char *s1, *s2;
       int n

       char *strcpy(s1, s2)
       char *s1, *s2;

       char *strncpy(s1, s2, n)
       char *s1, *s2;
       int n

       size_t strlen(s)
       char *s;

       char *strchr(s, c)
       char *s;
       int c;

       char *strrchr(s, c)
       char *s;
       int c;

       char *strpbrk(s1, s2)
       char *s1, *s2;

       size_t strspn(s1, s2)
       char *s1, *s2;

       size_t strcspn(s1, s2)
       char *s1, *s2;

       char *strtok(s1, s2)
       char *s1, *s2;

       char *index(s, c)
       char *s, c;

       char *rindex(s, c)
       char *s, c;

       char *strstr(s1, s2)
       char *s1, *s2;

Description
       The arguments s1, s2, and s point to strings (arrays of characters ter‐
       minated by a null character).  The functions and subroutines all	 alter
       s1.   These functions do not check for overflow of the array pointed to
       by s1.

       The subroutine appends a copy of string s2 to the  end  of  string  s1.
       The  subroutine	copies at most n characters.  Both return a pointer to
       the null-terminated result.

       The subroutine compares its arguments and returns  an  integer  greater
       than,  equal  to,  or less than 0, according as s1 is lexicographically
       greater than, equal to, or less than s2.	 The subroutine makes the same
       comparison  but	looks at at most n characters. The and subroutines are
       identical in function, but are case insensitive.	 The returned  lexico‐
       graphic difference reflects a conversion to lower-case.

       The  subroutine copies string s2 to s1, stopping after the null charac‐
       ter has been copied.  The subroutine copies exactly n characters, trun‐
       cating  s2  or  adding  null characters to s1 if necessary.  The result
       will not be null-terminated if the length of s2 is  n  or  more.	  Each
       function returns s1.

       The subroutine returns the number of characters in s, not including the
       terminating null character.

       The subroutine returns a pointer to the first occurrence of s2 (exclud‐
       ing the terminating null character) in s1, or a NULL pointer if s2 does
       not occur in s1.	 If the length of s2 is zero, returns s1.

       The ( ) function returns a pointer to the first	(last)	occurrence  of
       character  c  in string s, or a NULL pointer is c does not occur in the
       string.	The null character terminating a string is  considered	to  be
       part of the string.

       The  subroutine	returns a pointer to the first occurrence in string s1
       of any character from string s2, or a NULL pointer if no character from
       s2 exists in s1.

       The  ( ) subroutine returns the length of the initial segment of string
       s1 which consists entirely of characters from (not from) string s2.

       The subroutine considers the string s1 to consist of a sequence of zero
       or  more	 text tokens separated by spans of one or more characters from
       the separator string s2.	 The first call (with  pointer	s1  specified)
       returns	a  pointer to the first character of the first token, and will
       have written  a	null  character	 into  s1  immediately	following  the
       returned token.	The function keeps track of its position in the string
       between separate calls, so that subsequent calls (which	must  be  made
       with the first argument a NULL pointer) will work through the string s1
       immediately following that token.  In this way, subsequent  calls  will
       work  through  the  string  s1  until  no tokens remain.	 The separator
       string s2 may be different from call to call.  When no token remains in
       s1, a NULL pointer is returned.

       The  ( ) subroutine returns a pointer to the first (last) occurrence of
       character c in string s, or zero if c does not occur  in	  the  string.
       The <string.h> header file is provided for compatibility with System V;
       both <string.h> and <strings.h> refer to the same file.
       The and subroutines do unsigned character comparisons.

								     string(3)
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