reactos/rosapps/applications/net/ncftp/Strn/Strncpy.c
Aleksey Bragin 2012315e5a - Start rosapps rearrange and cleanup process.
svn path=/trunk/; revision=34303
2008-07-05 11:46:22 +00:00

46 lines
1 KiB
C

#include <sys/types.h>
#include <string.h>
#include "Strn.h"
/*
* Copy src to dst, truncating or null-padding to always copy n-1 bytes.
* Return dst.
*/
char *
Strncpy(char *const dst, const char *const src, const size_t n)
{
register char *d;
register const char *s;
register size_t i;
d = dst;
*d = 0;
if (n != 0) {
s = src;
/* If they specified a maximum of n characters, use n - 1 chars to
* hold the copy, and the last character in the array as a NUL.
* This is the difference between the regular strncpy routine.
* strncpy doesn't guarantee that your new string will have a
* NUL terminator, but this routine does.
*/
for (i=1; i<n; i++) {
if ((*d++ = *s++) == 0) {
#if (STRN_ZERO_PAD == 1)
/* Pad with zeros. */
for (; i<n; i++)
*d++ = 0;
#endif /* STRN_ZERO_PAD */
return dst;
}
}
/* If we get here, then we have a full string, with n - 1 characters,
* so now we NUL terminate it and go home.
*/
*d = 0;
}
return (dst);
} /* Strncpy */
/* eof Strn.c */