★ glibc strcat
#include <string.h>
#include <memcopy.h>
#undef strcat
/* Append SRC on the end of DEST. */
char *
strcat (dest, src)
char *dest;
const char *src;
{
char *s1 = dest;
const char *s2 = src;
reg_char c;
/* Find the end of the string. */
do
c = *s1++;
while (c != '\0');
/* Make S1 point before the next character, so we can increment
it while memory is read (wins on pipelined cpus). */
s1 -= 2;
do
{
c = *s2++;
*++s1 = c;
}
while (c != '\0');
return dest;
}
char * __cdecl strcat (
char * dst,
const char * src
)
{
char * cp = dst;
while( *cp )
cp++; /* find end of dst */
while( *cp++ = *src++ ) ; /* Copy src to end of dst */
return( dst ); /* return dst */
}
由這些實作來看，要注意的就是 dest 的空間要足夠(至少strlen(dest)+strlen(src)+1)，且dest所指的字串一定要有'\0'結尾!
This entry was posted
on 2009年10月8日 星期四
at 上午11:45
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