a C standard library for fx Casio calculators
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fxlibc/src/libc/string/strcpy.c

41 lines
1023 B

#include <string.h>
/*
** The strcpy() function copies the string pointed to by src, including the
** terminating null byte ('\0'), to the buffer pointed to by dest.
** The strings may not overlap, and the destination string dest must be
** large enough to receive the copy. Beware of buffer overruns!
**
** TODO: use quad-word access and/or DMA !
** TODO: look at the DSP ?
*/
char *strcpy(char *dest, char const *src)
{
size_t i;
if (src == NULL || dest == NULL)
return (0);
i = -1;
while (src[++i] != '\0')
dest[i] = src[i];
dest[i] = '\0';
return (dest);
}
/*
** The strncpy() function is similar, except that at most n bytes of src are
** copied. Warning: If there is no null byte among the first n bytes of src, the
** string placed in dest will not be null-terminated.
*/
char *strncpy(char *dest, char const *str, size_t size)
{
size_t i;
if (str == NULL || dest == NULL)
return (0);
i = -1;
while (++i < size && str[i] != '\0')
dest[i] = str[i];
dest[i] = '\0';
return (dest);
}