sscanf.c

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#define EOF (-2)

static int sgetch(int, char **);
static int sungetch(int, char **);
extern int _doscan(register char *, register int **,
                   int (*getc)(int, char **),
                   int (*ungetc)(int, char **), int, int);

/*------------------------------------------------------------------------
 *  sscanf  -  Read from a string according to a format.
 *             Return result of _doscan.
 *------------------------------------------------------------------------
 */
int sscanf(
    char *str, /* String to read from       */
    char *fmt, /* Format string     */
    int args   /* Num of args in format string  */
)
{
    char *s;

    s = str;
    return (_doscan(fmt, (int **)&args, sgetch, sungetch, 0, (int)&s));
}

/*------------------------------------------------------------------------
 *  sgetch  -  Get the next character from a string
 *------------------------------------------------------------------------
 */
static int sgetch(
    int dummy, /* Dummy unused variable */
    char **cpp /* String to use     */
)
{
    return (*(*cpp) == '\0' ? EOF : *(*cpp)++);
}

/*------------------------------------------------------------------------
 *  sungetch  -  Pushback a character in a string
 *------------------------------------------------------------------------
 */
static int sungetch(
    int dummy, /* Dummy unused variable */
    char **cpp /* String for pushback       */
)
{
    return (*(*cpp)--);
}