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#include <stdio.h>
#include <stdlib.h>
/* The C Programming Language: 2nd Edition
*
* Exercise 5-11: Modify the programs entab and detab (written as exercises in
* Chapter 1) to accept a list of tab stops as arguments. Use the default tab
* settings if there are no arguments.
*/
/* The directions for this exercise aren't terribly clear. The way I see it,
* each argument is a character column that all tabs should align to. For the
* entab portion, I should count 2+ spaces forward and, if I reach a tabstop,
* insert a tab. Then move onto the next argument. If 2+ spaces are present,
* but don't reach the tabstop threshold, the spaces are left alone. This is
* the best I could manage with the ambiguous instructions.
*/
#define TABWIDTH 8
int main(int argc, char *argv[]) {
int column, c, spaces, tabnum, stop;
spaces = column = 0;
if (argc > 1) {
tabnum = 1;
stop = atoi(argv[tabnum]);
} else {
tabnum = 0;
}
while ((c = getchar()) != EOF) {
column++;
if (c == ' ') {
spaces++;
if (argc > 1) {
if (column == stop) {
if (tabnum < (argc - 1)) {
stop = atoi(argv[++tabnum]);
}
if (spaces > 1) {
putchar('\t');
spaces = 0;
}
} else if (column > stop && tabnum < (argc - 1)) {
stop = atoi(argv[++tabnum]);
}
} else {
// we need to do default tabstopping
if (column % TABWIDTH == 0 && spaces > 1) {
putchar('\t');
spaces = 0;
}
}
} else {
// output all extra spaces first
while (spaces > 0) {
putchar(' ');
spaces--;
}
// reset the counts and argument position on a newline
if (c == '\n') {
column = 0;
spaces = 0;
if (tabnum > 0) {
tabnum = 1;
stop = atoi(argv[tabnum]);
}
}
putchar(c);
}
}
return 0;
}
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