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# include <stdlib.h>
# include <stdio.h>
# include <string.h>
/*
* See ../README.md
*/
/*
* Run as: cc -o ch-2.o ch-2.c; ./ch-2.o < input-file
*/
int main (void) {
char * text = NULL;
size_t len = 0;
size_t str_len;
if ((str_len = getdelim (&text, &len, '\0', stdin)) == -1) {
perror ("Failed to read stdin");
exit (1);
}
/*
* Count the number of input lines and columns.
*/
size_t nr_of_lines = 0;
size_t nr_of_columns = 0;
char * ptr = text;
while (* ptr) {
if (nr_of_lines == 0) {
if (* ptr == ',' || * ptr == '\n') {
nr_of_columns ++;
}
}
if (* ptr ++ == '\n') {
nr_of_lines ++;
}
}
/*
* Position pointer at the start of each input line;
* turn newlines into commas.
*/
char ** outputs;
if ((outputs = (char **) malloc (nr_of_lines * sizeof (char *)))
== NULL) {
perror ("Malloc failed");
exit (1);
}
ptr = text;
size_t c = 0;
outputs [0] = ptr;
while (* ptr) {
if (* ptr == '\n') {
* ptr = ',';
if (* (ptr + 1) != '\0') {
outputs [++ c] = ptr + 1;
}
}
ptr ++;
}
/*
* For each line of output, print a column of input.
* Field are terminated by commas. For the output, proceed
* each field with a comma, except for the first output column.
*/
for (size_t i = 0; i < nr_of_columns; i ++) {
for (size_t j = 0; j < nr_of_lines; j ++) {
if (j) {
printf (",");
}
while (* outputs [j] != ',') {
printf ("%c", * outputs [j] ++);
}
outputs [j] ++;
}
printf ("\n");
}
free (text);
return (0);
}
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