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/* Random helpful option parsing functions
Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <error.h>
/* For each string in the comma-separated list in ARG, call ADD_FN; if ARG is
empty and DEFAULT_ADD_FN isn't NULL, then call DEFAULT_ADD_FN instead. */
void
_parse_strlist (char *arg,
void (*add_fn)(const char *str), void (*default_add_fn)(),
const char *type_name)
{
if (arg)
while (isspace(*arg))
arg++;
if (arg == NULL || *arg == '\0')
if (default_add_fn)
(*default_add_fn)();
else
error(7, 0, "Empty %s list", type_name);
else
{
char *end = arg;
void mark_end()
{
*end++ = '\0';
while (isspace(*end))
end++;
}
void parse_element()
{
if (*arg == '\0')
error(7, 0, "Empty element in %s list", type_name);
(*add_fn)(arg);
arg = end;
}
while (*end != '\0')
switch (*end)
{
case ' ': case '\t':
mark_end();
if (*end == ',')
mark_end();
parse_element();
break;
case ',':
mark_end();
parse_element();
break;
default:
end++;
}
parse_element();
}
}
/* For each string in the comma-separated list in ARG, call ADD_FN; if ARG is
empty and DEFAULT_FN isn't NULL, then call ADD_FN on the resutl of calling
DEFAULT_FN instead, otherwise signal an error. */
void
parse_strlist (char *arg,
void (*add_fn)(const char *str),
const char *(*default_fn)(),
const char *type_name)
{
void default_str_add() { (*add_fn)((*default_fn)()); }
_parse_strlist(arg, add_fn, default_str_add, type_name);
}
/* For each numeric string in the comma-separated list in ARG, call ADD_FN;
if ARG is empty and DEFAULT_FN isn't NULL, then call DEF_FN to get a number,
and call ADD_FN on that, otherwise signal an error. If any member of the
list isn't a number, and LOOKUP_FN isn't NULL, then it is called to return
an integer for the string. LOOKUP_FN should signal an error itself it
there's some problem parsing the string. */
void
parse_numlist (char *arg,
void (*add_fn)(unsigned num),
int (*default_fn)(),
int (*lookup_fn)(const char *str),
const char *type_name)
{
void default_num_add() { (*add_fn)((*default_fn)()); }
void add_num_str(const char *str)
{
const char *p;
for (p = str; *p != '\0'; p++)
if (!isdigit(*p))
{
if (lookup_fn)
(*add_fn)((*lookup_fn)(str));
else
error (7, 0, "%s: Invalid %s", p, type_name);
return;
}
(*add_fn)(atoi(str));
}
_parse_strlist(arg, add_num_str, default_fn ? default_num_add : 0,
type_name);
}
/* Return the index of which of a set of strings ARG matches, including
non-ambiguous partial matches. CHOICE_FN should be a function that
returns the name of the Nth option, or 0 if N is out of range, and KIND
should be a string that describes what's being matched, for use in error
messages. If ALLOW_MISMATCHES is true, then -1 is returned in the event
that ARG matches no entry , otherwise, an error message is printed and the
program exits in this event. If ARG is an ambiguous match, an error
message is printed and the program exits. */
int
parse_enum (char *arg, const char *(*choice_fn)(unsigned n),
char *kind, int allow_mismatches)
{
const char *choice;
int arglen = strlen (arg);
int n = 0;
int partial_match = -1;
while ((choice = (*choice_fn)(n)) != NULL)
if (strcasecmp (choice, arg) == 0)
return n;
else
{
if (strncasecmp (choice, arg, arglen) == 0)
if (partial_match >= 0)
error (7, 0, "%s: Ambiguous %s", arg, kind);
else
partial_match = n;
n++;
}
if (partial_match < 0 && !allow_mismatches)
error (7, 0, "%s: Invalid %s", arg, kind);
return partial_match;
}
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