76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
#include <stdio.h>
|
|
#include <ctype.h>
|
|
|
|
#define SIZE 1000
|
|
|
|
/* check if c1-c2 is valid range */
|
|
#define IS_RANGE(c1, c2) ( \
|
|
(isdigit(c1) && isdigit(c2)) || \
|
|
(islower(c1) && islower(c2)) || \
|
|
(isupper(c1) && isupper(c2)) \
|
|
)
|
|
|
|
int getstr(char *s, int n);
|
|
void expand(char *s, char *t, int n);
|
|
|
|
/* copy stdin to string, run expand, print output */
|
|
int main()
|
|
{
|
|
char s[SIZE], t[SIZE];
|
|
if (getstr(s, SIZE) < 0)
|
|
printf("warning : overlfow on input\n");
|
|
expand(s, t, SIZE);
|
|
printf("%s\n", t);
|
|
return 0;
|
|
}
|
|
|
|
/* macro for checking overlfow of t in expand(s, t, n) */
|
|
#define CHECK_OVERFLOW(i, n) \
|
|
do { \
|
|
if (i >= n-1) { \
|
|
printf("warning : overflow in expand\n"); \
|
|
goto terminate; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* expand: expand a-z from s to to abc...xyz in t (of size n), same for
|
|
* digits and uppercase letters */
|
|
void expand(char *s, char *t, int n)
|
|
{
|
|
int i = 0;
|
|
if (*s == '\0')
|
|
goto terminate;
|
|
|
|
int c;
|
|
for (t[i++] = *(s++); *s != '\0'; s++, i++) {
|
|
if (*s == '-' && IS_RANGE(*(s-1), *(s+1))) {
|
|
for (c = *(s-1) + 1; c < *(s+1); c++, i++) {
|
|
CHECK_OVERFLOW(i, n);
|
|
t[i] = c;
|
|
}
|
|
s++;
|
|
}
|
|
CHECK_OVERFLOW(i, n);
|
|
t[i] = *s;
|
|
}
|
|
terminate:
|
|
t[i] = '\0';
|
|
}
|
|
|
|
/* getstr: copies stdin to array s of length n, returns size of string or
|
|
* -1 if overflow */
|
|
int getstr(char *s, int n)
|
|
{
|
|
int i, c;
|
|
|
|
for (i = 0; (c = getchar()) != EOF; i++) {
|
|
if (i >= n-1) {
|
|
s[i] = '\0';
|
|
return -1;
|
|
}
|
|
s[i] = c;
|
|
}
|
|
s[i] = '\0';
|
|
return i;
|
|
}
|