65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
#include <fxlibc/string.h>
|
|
#include <fxlibc/stdlib.h>
|
|
|
|
/*
|
|
** The strdup() function returns a pointer to a new string which is a
|
|
** duplicate of the string s. Memory for the new string is obtained with
|
|
** malloc(), and can be freed with free().
|
|
*/
|
|
char *strdup(const char *s)
|
|
{
|
|
size_t len;
|
|
void *dump;
|
|
|
|
// Check error
|
|
if (s == NULL)
|
|
return (NULL);
|
|
|
|
// Check len
|
|
len = strlen(s);
|
|
if (len == 0)
|
|
return (NULL);
|
|
|
|
// try to allocate the new area
|
|
dump = malloc(len);
|
|
if (dump == NULL)
|
|
return (NULL);
|
|
|
|
// dump the area and return
|
|
memcpy(dump, s, len);
|
|
return (dump);
|
|
}
|
|
|
|
/*
|
|
** The strndup() function is similar, but copies at most n bytes. If s is longer
|
|
** than n, only n bytes are copied, and a terminating null byte ('\0') is added.
|
|
*/
|
|
char *strndump(const char *s, size_t n)
|
|
{
|
|
size_t len;
|
|
char *dump;
|
|
|
|
// Check error
|
|
if (s == NULL)
|
|
return (NULL);
|
|
|
|
// Check len
|
|
len = strnlen(s, n);
|
|
if (len == 0)
|
|
return (NULL);
|
|
|
|
// try to allocate the new area
|
|
dump = malloc(len);
|
|
if (dump == NULL)
|
|
return (NULL);
|
|
|
|
// dump the area, set the null byte and return
|
|
memcpy(dump, s, len);
|
|
dump[len - 1] = '\0';
|
|
return (dump);
|
|
|
|
}
|
|
|
|
//TODO: strdupa()
|
|
//TODO: strndupa()
|