bird/client/commands.c

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/*
* BIRD Client -- Command Handling
*
* (c) 1999--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdio.h>
#include <ctype.h>
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/string.h"
#include "client/client.h"
struct cmd_info {
char *command;
char *args;
char *help;
int is_real_cmd;
};
static struct cmd_info command_table[] = {
#include "conf/commands.h"
};
struct cmd_node {
struct cmd_node *sibling, *son, **plastson;
struct cmd_info *cmd, *help;
int len;
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signed char prio;
char token[1];
};
static struct cmd_node cmd_root;
void
cmd_build_tree(void)
{
unsigned int i;
cmd_root.plastson = &cmd_root.son;
for(i=0; i<ARRAY_SIZE(command_table); i++)
{
struct cmd_info *cmd = &command_table[i];
struct cmd_node *old, *new;
char *c = cmd->command;
old = &cmd_root;
while (*c)
{
char *d = c;
while (*c && !isspace(*c))
c++;
for(new=old->son; new; new=new->sibling)
if (new->len == c-d && !memcmp(new->token, d, c-d))
break;
if (!new)
{
int size = sizeof(struct cmd_node) + c-d;
new = xmalloc(size);
bzero(new, size);
*old->plastson = new;
old->plastson = &new->sibling;
new->plastson = &new->son;
new->len = c-d;
memcpy(new->token, d, c-d);
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new->prio = (new->len == 3 && !memcmp(new->token, "roa", 3)) ? 0 : 1; /* Hack */
}
old = new;
while (isspace(*c))
c++;
}
if (cmd->is_real_cmd)
old->cmd = cmd;
else
old->help = cmd;
}
}
static void
cmd_do_display_help(struct cmd_info *c)
{
char buf[strlen(c->command) + strlen(c->args) + 4];
sprintf(buf, "%s %s", c->command, c->args);
printf("%-45s %s\n", buf, c->help);
}
static void
cmd_display_help(struct cmd_info *c1, struct cmd_info *c2)
{
if (c1)
cmd_do_display_help(c1);
else if (c2)
cmd_do_display_help(c2);
}
static struct cmd_node *
cmd_find_abbrev(struct cmd_node *root, char *cmd, int len, int *pambiguous)
{
struct cmd_node *m, *best = NULL, *best2 = NULL;
*pambiguous = 0;
for(m=root->son; m; m=m->sibling)
{
if (m->len == len && !memcmp(m->token, cmd, len))
return m;
if (m->len > len && !memcmp(m->token, cmd, len))
{
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if (best && best->prio > m->prio)
continue;
if (best && best->prio == m->prio)
best2 = best;
best = m;
}
}
if (best2)
{
*pambiguous = 1;
return NULL;
}
return best;
}
static void
cmd_list_ambiguous(struct cmd_node *root, char *cmd, int len)
{
struct cmd_node *m;
for(m=root->son; m; m=m->sibling)
if (m->len > len && !memcmp(m->token, cmd, len))
cmd_display_help(m->help, m->cmd);
}
void
cmd_help(char *cmd, int len)
{
char *end = cmd + len;
struct cmd_node *n, *m;
char *z;
int ambig;
n = &cmd_root;
while (cmd < end)
{
if (isspace(*cmd))
{
cmd++;
continue;
}
z = cmd;
while (cmd < end && !isspace(*cmd))
cmd++;
m = cmd_find_abbrev(n, z, cmd-z, &ambig);
if (ambig)
{
cmd_list_ambiguous(n, z, cmd-z);
return;
}
if (!m)
break;
n = m;
}
cmd_display_help(n->cmd, NULL);
for (m=n->son; m; m=m->sibling)
cmd_display_help(m->help, m->cmd);
}
static int
cmd_find_common_match(struct cmd_node *root, char *cmd, int len, int *pcount, char *buf)
{
struct cmd_node *m;
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int best, best_prio, i;
*pcount = 0;
best = -1;
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best_prio = -1;
for(m=root->son; m; m=m->sibling)
{
if (m->len < len || memcmp(m->token, cmd, len))
continue;
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if (best_prio > m->prio)
continue;
if (best_prio < m->prio)
{
*pcount = 0;
best = -1;
}
(*pcount)++;
if (best < 0)
{
strcpy(buf, m->token + len);
best = m->len - len;
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best_prio = m->prio;
}
else
{
i = 0;
while (i < best && i < m->len - len && buf[i] == m->token[len+i])
i++;
best = i;
}
}
return best;
}
int
cmd_complete(char *cmd, int len, char *buf, int again)
{
char *start = cmd;
char *end = cmd + len;
char *fin;
struct cmd_node *n, *m;
char *z;
int ambig, cnt = 0, common;
/* Find the last word we want to complete */
for(fin=end; fin > start && !isspace(fin[-1]); fin--)
;
/* Find the context */
n = &cmd_root;
while (cmd < fin && n->son)
{
if (isspace(*cmd))
{
cmd++;
continue;
}
z = cmd;
while (cmd < fin && !isspace(*cmd))
cmd++;
m = cmd_find_abbrev(n, z, cmd-z, &ambig);
if (ambig)
{
if (!again)
return -1;
input_start_list();
cmd_list_ambiguous(n, z, cmd-z);
input_stop_list();
return 0;
}
if (!m)
return -1;
n = m;
}
/* Completion of parameters is not yet supported */
if (!n->son)
return -1;
/* We know the context, let's try to complete */
common = cmd_find_common_match(n, fin, end-fin, &cnt, buf);
if (!cnt)
return -1;
if (cnt == 1)
{
buf[common++] = ' ';
buf[common] = 0;
return 1;
}
if (common > 0)
{
buf[common] = 0;
return 1;
}
if (!again)
return -1;
input_start_list();
cmd_list_ambiguous(n, fin, end-fin);
input_stop_list();
return 0;
}
char *
cmd_expand(char *cmd)
{
struct cmd_node *n, *m;
char *c, *b, *args;
int ambig;
args = c = cmd;
n = &cmd_root;
while (*c)
{
if (isspace(*c))
{
c++;
continue;
}
b = c;
while (*c && !isspace(*c))
c++;
m = cmd_find_abbrev(n, b, c-b, &ambig);
if (!m)
{
if (!ambig)
break;
puts("Ambiguous command, possible expansions are:");
cmd_list_ambiguous(n, b, c-b);
return NULL;
}
args = c;
n = m;
}
if (!n->cmd)
{
puts("No such command. Press `?' for help.");
return NULL;
}
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b = xmalloc(strlen(n->cmd->command) + strlen(args) + 1);
sprintf(b, "%s%s", n->cmd->command, args);
return b;
}