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#include <stdio.h>
#include <stdlib.h>
#define MAXLEN 1000
void getstr(char s[]);
void entab(char to[], char from[], int n);
/* replaces specified number of blanks with a tabstop */
int main(int argc, char *argv[]) {
int tabw;
char s[MAXLEN], tabbed[MAXLEN];
tabw = atoi(argv[1]);
printf("Enter text to entab and press ctrl+d\n");
getstr(s);
entab(tabbed, s, tabw);
printf("\nTab width: %d\n", tabw);
printf("%s\n", tabbed);
return 0;
}
void getstr(char s[]) {
int i, c;
for (i = 0; i < MAXLEN - 1 && (c = getchar()) != EOF; i++)
s[i] = c;
s[i] = '\0';
}
void entab(char to[], char from[], int n) {
int i, j, k, op;
char c;
for (i = 0, j = 0; j < MAXLEN - 1 && (c = from[j]) != '\0'; i++) {
if (c == ' ') {
op = j + n < MAXLEN - 1;
for (k = j + 1; op && k < j + n - 1; k++) {
if (from[k] != ' ') {
op = 0;
}
}
if (op) {
to[i] = '\t';
j += n;
continue;
}
}
to[i] = c;
j++;
}
to[i] = '\0';
}
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