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#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#define MAXTABLIST 10
#define MAXDIGLEN 10
#define TABSIZE 8
#define MAXTEXTLEN 500
int gettabs(char *s, int *t);
int gettext(char *s, int max);
void entab(char *s, char *t, int *tablist, int tablistc);
void detab(char *s, char *t, int *tablist, int tablistc);
int main(int argc, char *argv[]) {
int colv[MAXTABLIST], colc;
char op, s[MAXTEXTLEN], t[MAXTEXTLEN];
if ((argc != 2 && argc != 3) || (op = argv[1][1] != 'e' && op != 'd')) {
printf("usage: -e 5,3...\n");
return 1;
}
if (argc == 3)
colc = gettabs(argv[2], colv);
else {
colv[0] = TABSIZE;
colc = 1;
}
printf("enter text to %s and press CTRL+D\n", op == 'e' ? "entab" : "detab");
gettext(s, MAXTEXTLEN);
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:\n%s\n", op == 'e' ? "entabbed" : "detabbed", t);
return 0;
}
int gettabs(char *s, int *t) {
int i, j, k;
char col[MAXDIGLEN];
for (i = 0, j = 0, k = 0; j < MAXTABLIST && k < MAXDIGLEN && s[i] != 0; i++) {
if (s[i] == ' ' || s[i] == ',') {
col[k] = 0;
t[j++] = atoi(col);
k = 0;
} else if (isdigit(s[i]))
col[k++] = s[i];
else {
printf("error: invalid char in tablist\n");
return 0;
}
}
if (k >= MAXDIGLEN) {
printf("error: column number too large\n");
return 0;
}
return j;
}
int gettext(char *s, int max) {
int i, c;
for (i = 0; i < max && (c = getchar()) != EOF; i++)
s[i] = c;
s[i] = 0;
return i;
}
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