Re: question about reserved word file

[Shigio Yamaguchi]

> On Tue, 12 Oct 2004 00:37:48 +0900, Hideki IWAMOTO wrote...
> > The buffer holding the string without blanks can be referred
> > from the outside of the function to warn about unknown preprocessing direct
ives.
> 
> Since it was hard to avoid this problem, I gave up changing reserved_sharp.

Isn't it convenient if a general function to trim string is prepared?
I'm writing a following function for libutil/strmake.c.

-------------------------------------------------------------------
strtrim: delete blanks from original string.

      i)      p       original string.
      i)      flag    TRIM_HEAD       from only head
                      TRIM_TAIL       from only tail
                      TRIM_BOTH       from head and tail
                      TRIM_ALL        from all
      o)      len     length of result string
                      if len == NULL then nothing returned.
      r)              result string

Usage:
      strtrim(" # define ", TRIM_HEAD, NULL)  => "# define "
      strtrim(" # define ", TRIM_TAIL, NULL)  => " # define"
      strtrim(" # define ", TRIM_BOTH, NULL)  => "# define"
      strtrim(" # define ", TRIM_ALL, NULL)   => "#define"

NOTE: The result string share the string area.
      So, following call of this function may destroy the area.
-------------------------------------------------------------------

With this function, you can write blank processing like follows:

[gctags/asm_scan.l]
^[ \t]*\#[ \t]*{WORD} {
                if (reserved_sharp(yytext, yyleng)) {
                        ...
                }

[gctags/asm_res.h]
        #include "strmake.h"
        ...
        static int
        reserved_word(str, len)
        const char *str;
        int len;
        {
                char *p = strtrim(p, TRIM_ALL, &len);

                struct keyword *keyword = c_lookup(p, len);
                int n = keyword ? keyword->token : 0;
                return IS_RESERVED_WORD(n) ? n : 0;
        }

[htags/c.l]
        if (wflag)
                unknown_preprocessing_directive(strtrim(LEXTEXT, TRIM_ALL, 
NULL), LINENO);

If you think it is useful, please use it.
I will test and commit it in a couple of days.
--
Shigio Yamaguchi <address@hidden> - Tama Communications Corporation
PGP fingerprint: D1CB 0B89 B346 4AB6 5663  C4B6 3CA5 BBB3 57BE DDA3