77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
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FUNCTION
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<<strxfrm>>---transform string
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INDEX
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strxfrm
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ANSI_SYNOPSIS
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#include <string.h>
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size_t strxfrm(char *restrict <[s1]>, const char *restrict <[s2]>,
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size_t <[n]>);
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TRAD_SYNOPSIS
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#include <string.h>
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size_t strxfrm(<[s1]>, <[s2]>, <[n]>);
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char *<[s1]>;
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char *<[s2]>;
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size_t <[n]>;
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DESCRIPTION
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This function transforms the string pointed to by <[s2]> and
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places the resulting string into the array pointed to by
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<[s1]>. The transformation is such that if the <<strcmp>>
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function is applied to the two transformed strings, it returns
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a value greater than, equal to, or less than zero,
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correspoinding to the result of a <<strcoll>> function applied
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to the same two original strings.
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No more than <[n]> characters are placed into the resulting
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array pointed to by <[s1]>, including the terminating null
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character. If <[n]> is zero, <[s1]> may be a null pointer. If
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copying takes place between objects that overlap, the behavior
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is undefined.
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With a C locale, this function just copies.
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RETURNS
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The <<strxfrm>> function returns the length of the transformed string
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(not including the terminating null character). If the value returned
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is <[n]> or more, the contents of the array pointed to by
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<[s1]> are indeterminate.
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PORTABILITY
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<<strxfrm>> is ANSI C.
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<<strxfrm>> requires no supporting OS subroutines.
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QUICKREF
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strxfrm ansi pure
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*/
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#include <string.h>
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size_t
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_DEFUN (strxfrm, (s1, s2, n),
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char *__restrict s1 _AND
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_CONST char *__restrict s2 _AND
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size_t n)
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{
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size_t res;
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res = 0;
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while (n-- > 0)
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{
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if ((*s1++ = *s2++) != '\0')
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++res;
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else
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return res;
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}
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while (*s2)
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{
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++s2;
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++res;
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}
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return res;
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}
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