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Make the option -s easier to use.

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This commit is contained in:
Bruno Haible
2003-03-10 15:01:00 +00:00
parent 9492f0dad7
commit 6ba5486229
7 changed files with 70 additions and 25 deletions
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44
src/options.cc
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@@ -234,7 +234,7 @@ Options::long_usage (FILE * stream) const
" in relationship to the number of keys, e.g. a value\n"
" of 3 means \"allow the maximum associated value to\n"
" be about 3 times larger than the number of input\n"
" keys\". Conversely, a value of -3 means \"make the\n"
" keys\". Conversely, a value of 1/3 means \"make the\n"
" maximum associated value about 3 times smaller than\n"
" the number of input keys\". A larger table should\n"
" decrease the time required for an unsuccessful\n"
@@ -481,7 +481,7 @@ Options::~Options ()
"\ninitializer suffix = %s"
"\nasso_values iterations = %d"
"\njump value = %d"
"\nhash table size multiplier = %d"
"\nhash table size multiplier = %g"
"\ninitial associated value = %d"
"\ndelimiters = %s"
"\nnumber of switch statements = %d\n",
@@ -873,8 +873,44 @@ Options::parse_options (int argc, char *argv[])
}
case 's': /* Range of associated values, determines size of final table. */
{
if (abs (_size_multiple = atoi (/*getopt*/optarg)) > 50)
fprintf (stderr, "%d is excessive, did you really mean this?! (try `%s --help' for help)\n", _size_multiple, program_name);
float numerator;
float denominator = 1;
bool invalid = false;
char *endptr;
numerator = strtod (/*getopt*/optarg, &endptr);
if (endptr == /*getopt*/optarg)
invalid = true;
else if (*endptr != '\0')
{
if (*endptr == '/')
{
char *denomptr = endptr + 1;
denominator = strtod (denomptr, &endptr);
if (endptr == denomptr || *endptr != '\0')
invalid = true;
}
else
invalid = true;
}
if (invalid)
{
fprintf (stderr, "Invalid value for option -s.\n");
short_usage (stderr);
exit (1);
}
_size_multiple = numerator / denominator;
/* Backward compatibility: -3 means 1/3. */
if (_size_multiple < 0)
_size_multiple = 1 / (-_size_multiple);
/* Catch stupid users. */
if (_size_multiple == 0)
_size_multiple = 1;
/* Warnings. */
if (_size_multiple > 50)
fprintf (stderr, "Size multiple %g is excessive, did you really mean this?! (try '%s --help' for help)\n", _size_multiple, program_name);
else if (_size_multiple < 0.01f)
fprintf (stderr, "Size multiple %g is extremely small, did you really mean this?! (try '%s --help' for help)\n", _size_multiple, program_name);
break;
}
case 'S': /* Generate switch statement output, rather than lookup table. */