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#include <stdio.h>
#include <string.h>
#include <ctype.h>
/*
* Remove empty lines from the beginning and end.
*
* Turn multiple consecutive empty lines into just one
* empty line. Return true if it is an incomplete line.
*/
static int cleanup(char *line)
{
int len = strlen(line);
if (len && line[len-1] == '\n') {
if (len == 1)
return 0;
do {
unsigned char c = line[len-2];
if (!isspace(c))
break;
line[len-2] = '\n';
len--;
line[len] = 0;
} while (len > 1);
return 0;
}
return 1;
}
int main(int argc, char **argv)
{
int empties = -1;
int incomplete = 0;
char line[1024];
while (fgets(line, sizeof(line), stdin)) {
incomplete = cleanup(line);
/* Not just an empty line? */
if (line[0] != '\n') {
if (empties > 0)
putchar('\n');
empties = 0;
fputs(line, stdout);
continue;
}
if (empties < 0)
continue;
empties++;
}
if (incomplete)
putchar('\n');
return 0;
}
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