one/tab.c


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#include <stdio.h>

/* XXX: dependent on file size */
#define MAX 1024

void detab()
{
	char detab[MAX];

	int c, i;
	i = 0;
	while (i < MAX && (c = getchar()) != EOF) {
		if (c == '\t') {
			for (int t = 0; t < 8; ++t) {
				detab[i + t] = ' ';
			}
			i += 8;
		} else {
			detab[i++] = c;
		}
	}
	detab[i] = '\0';
	printf("%s", detab);
}

void entab()
{
	char entab[MAX];

	int c, i, s;
	i = s = 0;
	while (i < MAX && (c = getchar()) != EOF) {
		if (c == ' ') {
			++s;
		} else {
			while (s > 0) {
				if (s >= 8) {
					entab[i++] = '\t';
					s -= 8;
				} else {
					entab[i++] = ' ';
					--s;
				}
			}
			entab[i++] = c;
		}
	}

	entab[i] = '\0';
	printf("%s", entab);
}

int
main()
{
	detab();
	/* entab(); */
	return 0;
}