1 5dc21454 2023-07-14 jrmu /*
 2 5dc21454 2023-07-14 jrmu  * 1-22. Write a program to "fold" long input lines into two or more shorter lines after the last non-blank character that occurs before the n-th column of input. Make sure your program does something intelligent with very long lines, and if there are no blanks or tabs before the specified column.
 3 5dc21454 2023-07-14 jrmu  */
 4 5dc21454 2023-07-14 jrmu 
 5 5dc21454 2023-07-14 jrmu #include <stdio.h>
 6 5dc21454 2023-07-14 jrmu #define WIDTH 80
 7 5dc21454 2023-07-14 jrmu #define TABSTOP 8
 8 5dc21454 2023-07-14 jrmu 
 9 5dc21454 2023-07-14 jrmu int strln(char s[]);
10 5dc21454 2023-07-14 jrmu 
11 5dc21454 2023-07-14 jrmu main()
12 5dc21454 2023-07-14 jrmu {
13 5dc21454 2023-07-14 jrmu 	int c, i, ci;
14 5dc21454 2023-07-14 jrmu 	char current[WIDTH];
15 5dc21454 2023-07-14 jrmu 	int len;
16 5dc21454 2023-07-14 jrmu 
17 5dc21454 2023-07-14 jrmu 	ci = i = 0;
18 5dc21454 2023-07-14 jrmu 
19 5dc21454 2023-07-14 jrmu 	while ((c = getchar())!=EOF) {
20 5dc21454 2023-07-14 jrmu 		if (c == ' ') {
21 5dc21454 2023-07-14 jrmu 			current[ci] = '\0';
22 5dc21454 2023-07-14 jrmu 			len = strln(current)+1;
23 5dc21454 2023-07-14 jrmu 			if (i+len < WIDTH) {
24 5dc21454 2023-07-14 jrmu 				printf("%s%c", current, c);
25 5dc21454 2023-07-14 jrmu 				i += len;
26 5dc21454 2023-07-14 jrmu 			} else {
27 5dc21454 2023-07-14 jrmu 				printf("\n%s%c", current, c);
28 5dc21454 2023-07-14 jrmu 				i = len;
29 5dc21454 2023-07-14 jrmu 			}
30 5dc21454 2023-07-14 jrmu 			ci = 0;
31 5dc21454 2023-07-14 jrmu 		} else if (c == '\n') {
32 5dc21454 2023-07-14 jrmu 			current[ci] = '\0';
33 5dc21454 2023-07-14 jrmu 			printf("%s%c", current, c);
34 5dc21454 2023-07-14 jrmu 			ci = i = 0;
35 5dc21454 2023-07-14 jrmu 		} else if (c == '\t') {
36 5dc21454 2023-07-14 jrmu 			len = strln(current)+TABSTOP;
37 5dc21454 2023-07-14 jrmu 			current[ci] = '\0';
38 5dc21454 2023-07-14 jrmu 			if (i+len < WIDTH) {
39 5dc21454 2023-07-14 jrmu 				printf("%s%c", current, c);
40 5dc21454 2023-07-14 jrmu 				i += len;
41 5dc21454 2023-07-14 jrmu 			} else {
42 5dc21454 2023-07-14 jrmu 				printf("\n%s%c", current, c);
43 5dc21454 2023-07-14 jrmu 				i = len;
44 5dc21454 2023-07-14 jrmu 			}
45 5dc21454 2023-07-14 jrmu 			ci = 0;
46 5dc21454 2023-07-14 jrmu 		} else {
47 5dc21454 2023-07-14 jrmu 			current[ci] = c;
48 5dc21454 2023-07-14 jrmu 			++ci;
49 5dc21454 2023-07-14 jrmu 		}
50 5dc21454 2023-07-14 jrmu 	}
51 5dc21454 2023-07-14 jrmu }
52 5dc21454 2023-07-14 jrmu int strln(char s[])
53 5dc21454 2023-07-14 jrmu {
54 5dc21454 2023-07-14 jrmu 	int i;
55 5dc21454 2023-07-14 jrmu 	for (i=0; s[i] != '\0'; ++i)
56 5dc21454 2023-07-14 jrmu 		;
57 5dc21454 2023-07-14 jrmu 	return i;
58 5dc21454 2023-07-14 jrmu }