Display lines of input with every word reversed.

reverse.c

#include <ctype.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv) {
  for(argc -= 1, argv += 1; *argv; argc -= 1, argv += 1) {
    char *idx = *argv;
    char *begin = NULL;
    char *end = NULL;

    for(; *idx; idx += 1) {
      if(isalpha(*idx)) {
        if(!begin) {
          begin = idx;
        }

        end = idx;
      } else {
        for(; end && end >= begin; end -= 1) {
          fputc(*end, stdout);
        }

        if(begin) {
          begin = NULL;
          end = NULL;
        }

        fputc(*idx, stdout);
      }
    }

    for(; end && end >= begin; end -= 1) {
      fputc(*end, stdout);
    }

    fputc('\n', stdout);
  }

  return 0;
}