String Formatter

/*
 * Formats the input text into 75 character wide lines.  Takes each
 * non-blank unit as a word, and fits as many as possible on each
 * line.  It separates words by one space, unless the word ends in
 * a period, !, or ?, and the next word starts with a capitol,
 * in which case it gets two spaces.
 */
#include <stdio.h>
#include <string.h>
#include <ctype.h>

#define WIDTH           75              /* Width of a line. */
#define WORDSIZE        50              /* Storage size of input word. */

main()
{
        char line[WIDTH+1];             /* Output line. */
        char word[WORDSIZE];            /* Input word. */
        int linesize;                   /* Accumulated line size. */
        int wordsize;                   /* Size of inbound word. */
        int numspace;                   /* Number of separating spaces. */

        /* Initialize the output line. */
        line[0] = 0;
        linesize = 0;

        /* Read all the words in the input file. */
        while(scanf("%s", word) == 1)
        {
                /* How long is it? */
                wordsize = strlen(word);

                /* Decide how many spaces need to after the word. */
                if(linesize == 0)
                        numspace = 0;
                else if ((line[linesize-1] == '.' || 
                                        line[linesize-1] == '?' ||
                                        line[linesize-1] == '!') &&
                                isupper(word[0]))
                        numspace = 2;
                else
                        numspace = 1;

                /* See if it fits on the line, complete with separating 
                   space. */
                if(linesize + wordsize + numspace > WIDTH)
                {
                        /* Too long.  Spit out the line, and reset. */
                        printf("%s\n", line);
                        strcpy(line, word);
                        linesize = wordsize;
                }
                else
                {
                        /* Fits.  Add it to the line. */
                        strcat(line, "  " + (2 - numspace));
                        strcat(line, word);
                        linesize += wordsize + numspace;
                }
        }

        /* Print the last line. */
        printf("%s\n", line);
}