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#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#define MAXTAB 10
#define TABSIZE 8
#define MAXTEXT 500
#define MAXTABLIST 10
#define GETTEXT(s) \
({ \
int i, c; \
for (i = 0; i < MAXTEXT && (c = getchar()) != EOF; i++) \
s[i] = c; \
s[i] = 0; \
i; \
})
int gettablist(char *s, int *t);
/* Replaces tabs with blanks */
void detab(char *s, char *t, int *tablist, int tablistc);
/* Replaces blanks with tabs */
void entab(char *s, char *t, int *tablist, int tablistc);
int main(int argc, char *argv[]) {
int colv[MAXTABLIST], colc;
char op, s[MAXTEXT + 1], t[MAXTEXT + 1];
if ((argc != 2 && argc != 3) || ((op = argv[1][1]) != 'e' && op != 'd')) {
printf("Usage: -e 5,3...\n");
return 1;
}
if (argc == 3) {
if (!(colc = gettablist(argv[2], colv))) {
printf("Error: invalid tablist\n");
return 1;
}
} else {
colv[0] = TABSIZE;
colc = 1;
}
printf("Enter text to %s and press CTRL+D\n", op == 'e' ? "entab" : "detab");
if (!GETTEXT(s)) {
printf("Did not receive text!\n");
return 0;
}
switch (op) {
case 'e':
entab(s, t, colv, colc);
break;
case 'd':
detab(s, t, colv, colc);
break;
default:
printf("Error: invalid operation.\n");
return 1;
}
printf("%s text:\n%s\n", op == 'e' ? "Entabbed" : "Detabbed", t);
return 0;
}
int gettablist(char *s, int *t) {
int i, j, k;
char col[MAXTAB];
for (i = 0, j = 0, k = 0; j < MAXTABLIST; i++) {
if (k >= MAXTAB) {
printf("Error: tablist entry too large\n");
return 0;
}
if (s[i] == ' ' || s[i] == ',' || s[i] == 0) {
col[k] = 0;
t[j++] = atoi(col);
if (s[i] == 0)
break;
else
k = 0;
} else if (isdigit(s[i]))
col[k++] = s[i];
else {
printf("Error: invalid char %c in tablist\n", s[i]);
return 0;
}
}
return j;
}
void detab(char *s, char *t, int *tablist, int tablistc) {
int i, j, k, col;
if (tablistc < 2) {
col = tablistc == 0 ? TABSIZE : tablist[0];
for (i = 0, j = 0; j < MAXTEXT && (t[j] = s[i]) != 0; i++) {
if (s[i] == '\t') {
for (k = 0; k < col && j < MAXTEXT; k++, j++)
t[j] = ' ';
} else
j++;
}
} else {
col = 1;
for (i = 0, j = 0, k = 0; k < MAXTEXT && s[i] != 0 && j <= tablistc; i++) {
if (s[i] != '\t') {
t[k++] = s[i];
if (s[i] == '\n')
col = 1;
else
col++;
} else {
for (; col <= tablist[j] && k < MAXTEXT; col++)
t[k++] = ' ';
j++;
}
}
t[k] = 0;
}
}
void entab(char *s, char *t, int *tablist, int tablistc) {
int i, j, k, l, m, n;
if (tablistc < 2) {
for (i = 0, j = 0; s[i] != 0 && j < MAXTEXT; i++) {
if (s[i] != ' ')
t[j++] = s[i];
else {
for (k = i; k < i + tablist[0] && s[k] == ' '; k++)
;
if (k == i + tablist[0]) {
t[j++] = '\t';
i = k - 1;
} else
t[j++] = s[i];
}
}
t[j] = 0;
} else {
for (i = 0, j = 0, k = 0, l = 1; i < tablistc && s[j] != 0; j++) {
if (s[j] != ' ') {
t[k++] = s[j];
if (s[j] == '\n') {
l = 1;
i = 0;
} else
l++;
} else {
for (m = j, n = l; n <= tablist[i] && s[m] == ' '; m++, n++)
;
if (n == tablist[i] + 1) {
t[k++] = '\t';
l = n + 1;
j = m - 1;
for (i += 1; i < tablistc && tablist[i] >= l; i++)
;
} else {
t[k++] = s[j];
l++;
}
}
}
t[k] = 0;
}
}
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