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#include <stdio.h>
#include <ctype.h>
#define DEFTAB 8
#define MAXSTOPS 65
#define ON 1
int stops[MAXSTOPS];
int stop_position, m, n;
void entab(void);
void detab(void);
int
main(int argc, char **argv)
{
char flag;
int detab_bool = 0, entab_bool = 0, mnloop_bool = 0;
while (--argc > 0 && (**++argv == '-' || **argv == '+'))
while((flag = *++*argv))
switch (flag) {
case 'e' :
entab_bool = ON;
break;
case 'd' :
detab_bool = ON;
break;
case 's' :
if(*++*argv != '=')
argc = -1;
else
(*argv)++;
if (**argv == '\0')
argc = -1;
while (isdigit(**argv)) {
if (stop_position > MAXSTOPS)
argc = -1;
stops[stop_position] = stops[stop_position] * 10 + (**argv) - '0';
(*argv)++;
if (**argv == ',') {
(*argv)++;
if(isdigit(**argv) && stop_position < MAXSTOPS)
stop_position++;
}
}
stop_position++;
(*argv)--;
break;
default :
if (isdigit(flag)) {
if (*(*argv - 1) == '+')
for (mnloop_bool = 1; isdigit(**argv); (*argv)++)
n = n * 10 + (**argv) - '0';
else if (*(*argv - 1) == '-')
for (mnloop_bool = 1; isdigit(**argv); (*argv)++)
m = m * 10 + (**argv) - '0';
if(mnloop_bool) {
(*argv)--;
mnloop_bool = 0;
}
}
else {
argc = -1;
printf("Err: illigal option %c\n", flag);
}
break;
}
if (argc || !entab_bool ^ detab_bool || !m != !n)
printf("Usage: tab (-e || -d) (-s=s1,s2,s3,...,s%d || -m +n)\n", MAXSTOPS-1);
else if(entab_bool)
entab();
else if (detab_bool)
detab();
return 0;
}
void
entab(void)
{
char input;
int space, stop_now, count;
count = 0;
space = 0;
stop_now = 0;
stops[stop_position] = DEFTAB;
while((input = getchar()) != EOF)
switch(input) {
case ' ' :
space++;
count++;
break;
case '\n' :
count = 0;
break;
default :
if (count >= m)
stops[stop_position] = m;
while (space/stops[stop_now]) {
space -= stops[stop_now];
putchar('\t');
if (stop_now < stop_position)
stop_now++;
}
while (space) {
putchar(' ');
space--;
}
putchar(input);
break;
}
}
void
detab(void)
{
char input;
int count, space, stop_now;
count = 0;
stop_now = 0;
stops[stop_position] = DEFTAB;
while ((input = getchar()) != EOF)
switch (input) {
case '\n' :
count = 0;
putchar('\n');
break;
case '\t' :
space = stops[stop_now] - count%stops[stop_now];
count += space;
while (space--)
putchar(' ');
if (stop_now < stop_position)
stop_now++;
break;
default :
if (count++ >= m)
stops[stop_position] = n;
putchar(input);
break;
}
}
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