gistfile1.c

#include <stdio.h>

#define WRAP 10

int main(void)
{
    char buf[WRAP];
    int bufpos = 0;
    int linepos = 0;
    int beg=0;
    int last_whitespace = 0;
    int flush = 0;

    while ((buf[bufpos]=getchar())!=EOF)
    {
        // space left wrap-(pos-beg)
        // line length pos-beg
        // word length this_space - last space
        if (buf[bufpos]==' ' || buf[bufpos] == '\n')
        {
            //if ((linepos-last_whitespace) > (WRAP-(linepos-beg)) && last_whitespace > 0 || buf[bufpos]=='\n') // word > space left
            //{
                // this line somehow updates bufpos?
                // last run it cranked it from 4 to 10 and forced
            //  buf[last_whitespace] = '\n';
            //  flush=1;
            //}
            if (buf[bufpos]=='\n')
                flush=1;
            last_whitespace = linepos;
        }

        if (bufpos == (WRAP-1) || flush==1)
        {
            if (buf[bufpos]=='\n')
                linepos=0;
            else
                ++linepos;
             buf[bufpos+1] = '\0';
             if (last_whitespace>0)
                buf[last_whitespace] = '\n';
            printf("%s",buf);
            if (!flush) {
                putchar('\n');
                beg=0;
                last_whitespace=0;
            }
            bufpos=0;
            flush=0;
            for (bufpos=0;bufpos<WRAP;++bufpos)
                buf[bufpos] = '\0';
            bufpos=0;
        } else {
            ++bufpos;
            ++linepos;
        }
    }

    return 0;
}