Re: Command line globber/tokenizer library for C?

Michael S <already5chosen@yahoo.com> writes:

[..iterate over words in a string..]

#include <stddef.h>
>
void parse(const char* src,
  void (*OnToken)(const char* beg, size_t len, void* context),
  void* context) {
  char c0 = ' ', c1 = '\t';
  const char* beg = 0;
  for (;;src++) {
    char c = *src;
    if (c == c0 || c == c1 || c == 0) {
      if (beg) {
        OnToken(beg, src-beg, context);
        c0 = ' ', c1 = '\t';
        beg = 0;
      }
      if (c == 0)
        break;
    } else if (!beg) {
      beg = src;
      if (c == '"') {
        c0 = c1 = c;
        ++beg;
      }
    }
  }
}

I couldn't resist writing some code along similar lines.  The
entry point is words_do(), which returns one on success and
zero if the end of string is reached inside double quotes.


typedef struct gopher_s *Gopher;
struct gopher_s { void (*f)( Gopher, const char *, const char * ); };

static  _Bool   collect_word( const char *, const char *, _Bool, Gopher );
static  _Bool   is_space( char );


_Bool
words_do( const char *s, Gopher go ){
  char   c      =  *s;

    return
      is_space(c)       ?  words_do( s+1, go )                          :
      c                 ?  collect_word( s, s, 1, go )                  :
      /***************/    1;
}

_Bool
collect_word( const char *s, const char *r, _Bool w, Gopher go ){
  char   c      =  *s;

    return
      c == 0            ?  go->f( go, r, s ),  w                        :
      is_space(c) && w  ?  go->f( go, r, s ),  words_do( s, go )        :
      /***************/    collect_word( s+1, r, w ^ c == '"', go );
}

_Bool
is_space( char c ){
    return  c == ' '  ||  c == '\t';
}