53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#define MAXLINE 1000 /* maximum characters in a line */
|
||
|
|
#define TABWIDTH 4 /* tab size */
|
||
|
|
|
||
|
|
int my_getline(char line[], int maxline);
|
||
|
|
void detab(char to[], char from[]);
|
||
|
|
|
||
|
|
|
||
|
|
main()
|
||
|
|
{
|
||
|
|
int len; /* current line length */
|
||
|
|
char line[MAXLINE]; /* current input line */
|
||
|
|
char detab_line[MAXLINE]; /* detabbed line */
|
||
|
|
|
||
|
|
while ((len = my_getline(line, MAXLINE)) > 0) {
|
||
|
|
detab(detab_line, line);
|
||
|
|
printf("%s", detab_line);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* my_getline: reads in a line, return the length */
|
||
|
|
int my_getline(char line[], int lim)
|
||
|
|
{
|
||
|
|
int c, i;
|
||
|
|
|
||
|
|
for (i = 0; i < lim-1 && (c=getchar()) != EOF && c != '\n'; ++i)
|
||
|
|
line[i] = c;
|
||
|
|
if (c == '\n') {
|
||
|
|
line[i] = c;
|
||
|
|
++i;
|
||
|
|
}
|
||
|
|
line[i] = '\0';
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* detab: replace tab with blanks in line; does not handle the limit */
|
||
|
|
void detab(char to[], char from[])
|
||
|
|
{
|
||
|
|
int i, j, k;
|
||
|
|
|
||
|
|
i = j = k = 0;
|
||
|
|
while ((to[j] = from[i]) != '\0') {
|
||
|
|
if (to[j] == '\t')
|
||
|
|
for (k = 0; k < TABWIDTH; ++k, ++j)
|
||
|
|
to[j] = ' ';
|
||
|
|
else
|
||
|
|
++j;
|
||
|
|
++i;
|
||
|
|
}
|
||
|
|
}
|