| #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. |
| */ |
| static void cleanup(char *line) |
| { |
| int len = strlen(line); |
| |
| if (len > 1 && line[len-1] == '\n') { |
| do { |
| unsigned char c = line[len-2]; |
| if (!isspace(c)) |
| break; |
| line[len-2] = '\n'; |
| len--; |
| line[len] = 0; |
| } while (len > 1); |
| } |
| } |
| |
| int main(int argc, char **argv) |
| { |
| int empties = -1; |
| char line[1024]; |
| |
| while (fgets(line, sizeof(line), stdin)) { |
| 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++; |
| } |
| return 0; |
| } |