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memrchr (3)
  • memrchr (3) ( FreeBSD man: Библиотечные вызовы )
  • memrchr (3) ( Русские man: Библиотечные вызовы )
  • >> memrchr (3) ( Linux man: Библиотечные вызовы )
  •  

    NAME

    memchr, memrchr, rawmemchr - scan memory for a character
     
    

    SYNOPSIS

    #include <string.h>
    
    void *memchr(const void *s, int c, size_t n);
    
    void *memrchr(const void *s, int c, size_t n);
    
    void *rawmemchr(const void *s, int c);
    

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    rawmemchr(): _GNU_SOURCE  

    DESCRIPTION

    The memchr() function scans the first n bytes of the memory area pointed to by s for the character c. The first byte to match c (interpreted as an unsigned character) stops the operation.

    The memrchr() function is like the memchr() function, except that it searches backwards from the end of the n bytes pointed to by s instead of forwards from the beginning.

    The rawmemchr() function is similar to memchr(): it assumes (i.e., the programmer knows for certain) that the character c lies somewhere in the string s, and so performs an optimized search for the character c (i.e., no checking for the terminating null byte, or use of an argument, n, to limit the range of the search). If the chararacter c is not in the string s, then rawmemchr() may proceeed to search beyond the end of the string, and the result is unspecified. The folowing call is a fast means of locating a string's terminating null byte:

    
    char *p = rawmemchr(s, aq\0aq);
    
     

    RETURN VALUE

    The memchr() and memrchr() functions return a pointer to the matching byte or NULL if the character does not occur in the given memory area.

    The rawmemchr() function returns a pointer to the matching byte, if one is found. If no matching byte is found, the result is unspecified.  

    VERSIONS

    rawmemchr() first appeared in glibc in version 2.1.

    memrchr() first appeared in glibc in version 2.2.  

    CONFORMING TO

    The memchr() function conforms to SVr4, 4.3BSD, C89, C99, POSIX.1-2001.

    The memrchr() function is a GNU extension, available since glibc 2.1.91.

    The rawmemchr() function is a GNU extension, available since glibc 2.1.  

    SEE ALSO

    index(3), rindex(3), strchr(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), wmemchr(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    VERSIONS
    CONFORMING TO
    SEE ALSO
    COLOPHON


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