Improved parsing of resolver configuration files

  Changelog for the c-ares project

* May 5 2008 (Yang Tse)

- Improved parsing of resolver configuration files.

* April 4 2008 (Daniel Stenberg)

- Eino Tuominen improved the code when a file is used to seed the randomizer.

This is what's new and changed in the c-ares 1.5.2 release:

 o 

 o improved parsing of resolver configuration files

Thanks go to these friendly people for their efforts and contributions:

 Yang Tse

Have fun!

static char *try_config(char *s, const char *opt)

{

  size_t len;

  ssize_t i;

  ssize_t j;

  char *p;

  len = strlen(opt);

  if (strncmp(s, opt, len) != 0 || !ISSPACE(s[len]))

  if (!s || !opt)

    /* no line or no option */

    return NULL;

  /* trim line comment */

  for (i = 0; s[i] && s[i] != '#'; ++i);

  s[i] = '\0';

  /* trim trailing whitespace */

  for (j = i-1; j >= 0 && ISSPACE(s[j]); --j);

  s[++j] = '\0';

  /* skip leading whitespace */

  for (i = 0; s[i] && ISSPACE(s[i]); ++i);

  p = &s[i];

  if (!*p)

    /* empty line */

    return NULL;

  if ((len = strlen(opt)) == 0)

    /* empty option */

    return NULL;

  if (strncmp(p, opt, len) != 0)

    /* line and option do not match */

    return NULL;

  s += len;

  while (ISSPACE(*s))

    s++;

  return s;

}

  /* skip over given option name */

  p += len;

  if (!*p)

    /* no option value */

    return NULL;

  if ((opt[len-1] != ':') && (opt[len-1] != '=') && !ISSPACE(*p))

    /* whitespace between option name and value is mandatory

       for given option names which do not end with ':' or '=' */

    return NULL;

  /* skip over whitespace */

  while (*p && ISSPACE(*p))

    p++;

  if (!*p)

    /* no option value */

    return NULL;

  /* return pointer to option value */

  return p;

}

#endif

static const char *try_option(const char *p, const char *q, const char *opt)