45 lines
909 B
C
45 lines
909 B
C
/*
|
|
* This version reads directly from the buffer rather than looping on getc.
|
|
* Ptr args aren't checked for NULL because the program would be a
|
|
* catastrophic mess anyway. Better to abort than just to return NULL.
|
|
*/
|
|
#include <stdio.h>
|
|
#include "stdiom.h"
|
|
|
|
extern int _filbuf();
|
|
extern _bufsync();
|
|
extern char *memccpy();
|
|
|
|
char *
|
|
gets(ptr)
|
|
char *ptr;
|
|
{
|
|
char *p, *ptr0 = ptr;
|
|
register int n;
|
|
|
|
for ( ; ; ) {
|
|
if (stdin->_cnt <= 0) { /* empty buffer */
|
|
if (_filbuf(stdin) == EOF) {
|
|
if (ptr0 == ptr)
|
|
return (NULL);
|
|
break; /* no more data */
|
|
}
|
|
stdin->_ptr--;
|
|
stdin->_cnt++;
|
|
}
|
|
n = stdin->_cnt;
|
|
if ((p = memccpy(ptr, (char *) stdin->_ptr, '\n', n)) != NULL)
|
|
n = p - ptr;
|
|
ptr += n;
|
|
stdin->_cnt -= n;
|
|
stdin->_ptr += n;
|
|
_BUFSYNC(stdin);
|
|
if (p != NULL) { /* found '\n' in buffer */
|
|
ptr--; /* step back over '\n' */
|
|
break;
|
|
}
|
|
}
|
|
*ptr = '\0';
|
|
return (ptr0);
|
|
}
|