1 /*
2  * 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  */
4 
5 #include <stdio.h>
6 #define WIDTH 80
7 #define TABSTOP 8
8 
9 int strln(char s[]);
10 
11 main()
12 {
13 	int c, i, ci;
14 	char current[WIDTH];
15 	int len;
16 
17 	ci = i = 0;
18 
19 	while ((c = getchar())!=EOF) {
20 		if (c == ' ') {
21 			current[ci] = '\0';
22 			len = strln(current)+1;
23 			if (i+len < WIDTH) {
24 				printf("%s%c", current, c);
25 				i += len;
26 			} else {
27 				printf("\n%s%c", current, c);
28 				i = len;
29 			}
30 			ci = 0;
31 		} else if (c == '\n') {
32 			current[ci] = '\0';
33 			printf("%s%c", current, c);
34 			ci = i = 0;
35 		} else if (c == '\t') {
36 			len = strln(current)+TABSTOP;
37 			current[ci] = '\0';
38 			if (i+len < WIDTH) {
39 				printf("%s%c", current, c);
40 				i += len;
41 			} else {
42 				printf("\n%s%c", current, c);
43 				i = len;
44 			}
45 			ci = 0;
46 		} else {
47 			current[ci] = c;
48 			++ci;
49 		}
50 	}
51 }
52 int strln(char s[])
53 {
54 	int i;
55 	for (i=0; s[i] != '\0'; ++i)
56 		;
57 	return i;
58 }