On Oct 30, 12:58Â pm, noah.ev...@gmail.com (Noah Evans) wrote:
> This kind of problem is character processing, which I would argue is
> C's domain. You can massage awk and sed to do the job for you, but at
> least for me it's conceptually simpler to just bang out the following
> C program:
>
> #include <u.h>
> #include <libc.h>
> #include <bio.h>
>
> #define isupper(r) Â Â Â (L'A' <= (r) && (r) <= L'Z')
> #define islower(r) Â Â Â (L'a' <= (r) && (r) <= L'z')
> #define isalpha(r) Â Â Â (isupper(r) || islower(r))
> #define isspace(r) Â Â Â ((r) == L' ' || (r) == L'\t' \
> Â Â Â Â Â Â Â Â Â Â Â Â || (0x0A <= (r) && (r) <= 0x0D))
> #define toupper(r) Â Â Â ((r)-'a'+'A')
>
> void
> usage(char *me)
> {
> Â Â Â Â fprint(2, "%s: usage\n", me);
>
> }
>
> void
> main(int argc, char **argv)
> {
> Â Â Â Â Biobuf in, out;
> Â Â Â Â int c, waswhite, nwords;
>
> Â Â Â Â ARGBEGIN{
> Â Â Â Â default:
> Â Â Â Â Â Â Â Â usage(argv[0]);
> Â Â Â Â }ARGEND;
> Â Â Â Â Binit(&in, 0, OREAD);
> Â Â Â Â Binit(&out, 1, OWRITE);
>
> Â Â Â Â waswhite = 0;
> Â Â Â Â nwords = 0;
> Â Â Â Â while((c = Bgetc(&in)) != Beof){
> Â Â Â Â Â Â Â Â if(isalpha(c))
> Â Â Â Â Â Â Â Â if(waswhite)
> Â Â Â Â Â Â Â Â if(nwords < 2){
> Â Â Â Â Â Â Â Â Â Â Â Â if(islower(c))
> Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â c = toupper(c);
> Â Â Â Â Â Â Â Â Â Â Â Â nwords++;
> Â Â Â Â Â Â Â Â }
> Â Â Â Â Â Â Â Â if(isspace(c))
> Â Â Â Â Â Â Â Â Â Â Â Â waswhite = 1;
> Â Â Â Â Â Â Â Â else
> Â Â Â Â Â Â Â Â Â Â Â Â waswhite = 0;
> Â Â Â Â Â Â Â Â if(c == '\n')
> Â Â Â Â Â Â Â Â Â Â Â Â nwords = 0;
> Â Â Â Â Â Â Â Â Bputc(&out, c);
> Â Â Â Â }
> Â Â Â Â exits(0);
>
> }
>
> Noah
>
Simple, and wrong. You need to initialize waswhite to 1, not 0.
