Andrew's git - gitweb.git/blob

   1#include <stdio.h>
   2#include <string.h>
   3#include <ctype.h>
   4
   5/*
   6 * Remove empty lines from the beginning and end.
   7 *
   8 * Turn multiple consecutive empty lines into just one
   9 * empty line.  Return true if it is an incomplete line.
  10 */
  11static int cleanup(char *line)
  12{
  13        int len = strlen(line);
  14
  15        if (len && line[len-1] == '\n') {
  16                if (len == 1)
  17                        return 0;
  18                do {
  19                        unsigned char c = line[len-2];
  20                        if (!isspace(c))
  21                                break;
  22                        line[len-2] = '\n';
  23                        len--;
  24                        line[len] = 0;
  25                } while (len > 1);
  26                return 0;
  27        }
  28        return 1;
  29}
  30
  31int main(int argc, char **argv)
  32{
  33        int empties = -1;
  34        int incomplete = 0;
  35        char line[1024];
  36
  37        while (fgets(line, sizeof(line), stdin)) {
  38                incomplete = cleanup(line);
  39
  40                /* Not just an empty line? */
  41                if (line[0] != '\n') {
  42                        if (empties > 0)
  43                                putchar('\n');
  44                        empties = 0;
  45                        fputs(line, stdout);
  46                        continue;
  47                }
  48                if (empties < 0)
  49                        continue;
  50                empties++;
  51        }
  52        if (incomplete)
  53                putchar('\n');
  54        return 0;
  55}