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#include <stdio.h>
#define MAXLEN 5000
char* escape(char to[], const char from[]);
char* etr(char to[], const char from[]);
int
main(void)
{
int i;
char input;
char str[MAXLEN];
char e[MAXLEN];
char r[MAXLEN];
for (i = 0; (input = getchar()) != EOF && i+1 < MAXLEN; ++i)
str[i] = input;
str[i] = '\0';
if (str[i-1] != '\n')
printf("\n");
printf("%s\n", escape(e, str));
printf("%s\n", etr(r, e));
return 0;
}
char*
escape(char to[], const char from[])
{
int i, j;
for (i = j = 0; from[i] != '\0' && j+1 < MAXLEN; ++i)
switch (from[i]) {
case '\n' :
to[j++] = '\\';
to[j++] = 'n';
break;
case '\t' :
to[j++] = '\\';
to[j++] = 't';
break;
case '\a' :
to[j++] = '\\';
to[j++] = 'a';
break;
case '\b' :
to[j++] = '\\';
to[j++] = 'b';
break;
case '\f' :
to[j] = '\\';
to[j++] = 'f';
break;
case '\r' :
to[j++] = '\\';
to[j++] = 'r';
break;
case '\v' :
to[j++] = '\\';
to[j++] = 'v';
break;
default:
to[j++] = from[i];
break;
}
to[i] = '\0';
return to;
}
char*
etr(char to[], const char from[])
{
int i, j;
for (i = j = 0; from[i] != '\0'; ++i) {
if (from[i] == '\\')
switch (from[++i]) {
case 'n' :
to[j++] = '\n';
break;
case 't' :
to[j++] = '\t';
break;
case 'a' :
to[j++] = '\a';
break;
case 'b' :
to[j++] = '\b';
break;
case 'f' :
to[j++] = '\f';
break;
case 'r' :
to[j++] = '\r';
break;
case 'v' :
to[j++] = '\r';
break;
default :
to[j++] = '\\';
to[j++] = from[i];
break;
}
else
to[j++] = from[i];
}
to[j] = '\0';
return to;
}
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