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# include <stdlib.h>
# include <stdio.h>
# include <string.h>
# include <ctype.h>
# include <stdbool.h>
/*
* See ../README.md
*/
/*
* Run as: cc -o ch-1.o ch-1.c; ./ch-1.o < input-file
*/
int main (void) {
char * raw = NULL;
size_t len = 0;
size_t str_len;
while ((str_len = getline (&raw, &len, stdin)) != -1) {
/*
* Make a copy of line, but without the spaces
*/
char * line;
if ((line = (char *) malloc ((str_len + 2) * sizeof (char))) == NULL) {
perror ("Malloc failed");
exit (1);
}
char * raw_ptr = raw;
char * line_ptr = line;
while (* raw_ptr) {
/*
* Skip white space
*/
if (isspace (* raw_ptr)) {
raw_ptr ++;
continue;
}
/*
* If the first character is a '+', write two 0s.
*/
if (line_ptr == line && * raw_ptr == '+') {
* line_ptr ++ = '0';
* line_ptr ++ = '0';
raw_ptr ++;
continue;
}
* line_ptr ++ = * raw_ptr ++;
}
* line_ptr = '\0';
/*
* If the first character is a '(', and the fourth is a ')',
* replace both of them with 0
*/
if (line [0] == '(' && line [3] == ')') {
line [0] = '0';
line [3] = '0';
}
/*
* Check that we have exactly 14 digits
*/
bool valid = true;
for (size_t i = 0; i < 14 && valid; i ++) {
if (!isdigit (line [i])) {
valid = false;
}
}
if (valid && line [14] == '\0') {
printf ("%s", raw);
}
free (line);
}
free (raw);
return (0);
}
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