1 5dc21454 2023-07-14 jrmu /* 1-18. Write a program to remove trailing blanks and tabs from each
 2 5dc21454 2023-07-14 jrmu  * line of input, and to delete entirely blank lines.
 3 5dc21454 2023-07-14 jrmu  */
 4 5dc21454 2023-07-14 jrmu 
 5 5dc21454 2023-07-14 jrmu /* MAXLINE has been reduced for easier testing */
 6 5dc21454 2023-07-14 jrmu #include <stdio.h>
 7 5dc21454 2023-07-14 jrmu #define MAXLINE 1000
 8 5dc21454 2023-07-14 jrmu 
 9 5dc21454 2023-07-14 jrmu int getlin(char line[], int maxline);
10 5dc21454 2023-07-14 jrmu void copy(char to[], char from[]);
11 5dc21454 2023-07-14 jrmu 
12 5dc21454 2023-07-14 jrmu main()
13 5dc21454 2023-07-14 jrmu {
14 5dc21454 2023-07-14 jrmu 	int len;	/* current line length */
15 5dc21454 2023-07-14 jrmu 	char line[MAXLINE];	/* current input line */
16 5dc21454 2023-07-14 jrmu 	
17 5dc21454 2023-07-14 jrmu 	while ((len = getlin(line, MAXLINE)) > 0) {
18 5dc21454 2023-07-14 jrmu 		if (line[0] != '\0')
19 5dc21454 2023-07-14 jrmu 			printf("%s\n", line);
20 5dc21454 2023-07-14 jrmu 	}
21 5dc21454 2023-07-14 jrmu 	return 0;
22 5dc21454 2023-07-14 jrmu }
23 5dc21454 2023-07-14 jrmu 
24 5dc21454 2023-07-14 jrmu int getlin(char s[], int lim)
25 5dc21454 2023-07-14 jrmu {
26 5dc21454 2023-07-14 jrmu 	int c, i, nullchar;
27 5dc21454 2023-07-14 jrmu 	nullchar = 0;
28 5dc21454 2023-07-14 jrmu 
29 5dc21454 2023-07-14 jrmu 	for (i=0; i<lim-1 && (c=getchar())!=EOF && c!='\n'; ++i) {
30 5dc21454 2023-07-14 jrmu 		if (c != '\t' && c != ' ') {
31 5dc21454 2023-07-14 jrmu 			nullchar = i+1;
32 5dc21454 2023-07-14 jrmu 		}
33 5dc21454 2023-07-14 jrmu 		s[i] = c;
34 5dc21454 2023-07-14 jrmu 	}
35 5dc21454 2023-07-14 jrmu 	if (c == '\n')
36 5dc21454 2023-07-14 jrmu 		++i;
37 5dc21454 2023-07-14 jrmu 	s[nullchar] = '\0';
38 5dc21454 2023-07-14 jrmu 	return i;
39 5dc21454 2023-07-14 jrmu }
40 5dc21454 2023-07-14 jrmu 
41 5dc21454 2023-07-14 jrmu void copy(char to[], char from[])
42 5dc21454 2023-07-14 jrmu {
43 5dc21454 2023-07-14 jrmu 	int i;
44 5dc21454 2023-07-14 jrmu 	i = 0;
45 5dc21454 2023-07-14 jrmu 	while ((to[i] = from[i]) != '\0')
46 5dc21454 2023-07-14 jrmu 		++i;
47 5dc21454 2023-07-14 jrmu }