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qcli.c
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qcli.c
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/*
* qcli - Tiny command interface library
*
* Copyright (C) 2020-2021 Ingo Albrecht <[email protected]>
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* For more information, please refer to <http://unlicense.org/>
*/
#include "qcli.h"
#include <assert.h>
#include <string.h>
#include <stdio.h>
static void indent(int level)
{
int i;
for(i = 0; i < level; i++) {
printf(" ");
}
}
static void printtable(qcli_tbl_t *t, int level)
{
int i;
for(i = 0; i < t->cmdc; i++) {
qcli_cmd_t *c = t->cmds + i;
indent(level);
printf("%s - %s\n", c->cmd_name, c->cmd_help);
}
}
static qcli_cmd_t *
qcli_find(qcli_tbl_t *t, const char *token)
{
int i;
for(i = 0; i < t->cmdc; i++) {
qcli_cmd_t *c = t->cmds + i;
if(!strcmp(token, c->cmd_name)) {
return c;
}
}
return NULL;
}
static void
qcli_tokenize(qcli_t *c, const char *cmd, qcli_fun_t fun)
{
char *tok[512];
char buf[512];
char *pos = buf;
int tokcnt = 0;
size_t len;
memset(tok, 0, sizeof(tok));
strncpy(buf, cmd, sizeof(buf)-1);
while(*pos) {
pos += strspn(pos, " \t\r\n");
len = strcspn(pos, " \t\r\n");
if(len) {
tok[tokcnt++] = pos;
pos += len;
if(*pos) {
*pos = 0;
pos++;
}
} else {
break;
}
}
tok[tokcnt] = NULL;
fun(c, tokcnt, tok);
}
static void tty_exec_handler(qtty_t *t, void *cookie, const char *line) {
qcli_t *c = (qcli_t *)cookie;
qcli_tokenize(c, line, qcli_exec);
}
static void tty_help_handler(qtty_t *t, void *cookie, const char *line) {
qcli_t *c = (qcli_t *)cookie;
qcli_tokenize(c, line, qcli_help);
}
int qcli_init(qcli_t *c, qtty_t *tty, qcli_tbl_t *tbl)
{
memset(c, 0, sizeof(*c));
c->tty = tty;
c->commands = tbl;
qtty_setup(tty, "> ", c, tty_exec_handler, tty_help_handler);
return 0;
}
int qcli_loop(qcli_t *c)
{
return qtty_loop(c->tty);;
}
int qcli_exec(qcli_t *c, int argc, char **argv)
{
int i;
qcli_tbl_t *t = c->commands;
qtty_finish(c->tty);
for(i = 0; i < argc; i++) {
qcli_cmd_t *cmd = qcli_find(t, argv[i]);
if(cmd) {
if(cmd->cmd_fun) {
return cmd->cmd_fun(c, argc - i - 1, argv + i + 1);
} else if (cmd->cmd_sub) {
t = cmd->cmd_sub;
} else {
qtty_message(c->tty, "Invalid command table entry.\n");
return 1;
}
} else {
qtty_message(c->tty, "Unknown command.\n");
return 1;
}
}
qtty_message(c->tty, "Incomplete command.\n");
return 1;
}
int qcli_help(qcli_t *c, int argc, char **argv)
{
int i;
qcli_tbl_t *t = c->commands;
qtty_finish(c->tty);
for(i = 0; i < argc; i++) {
qcli_cmd_t *cmd = qcli_find(t, argv[i]);
if(cmd) {
indent(i);
printf("%s - %s\n", cmd->cmd_name, cmd->cmd_help);
if(cmd->cmd_fun) {
printf("command is complete.");
return 0;
} else if (cmd->cmd_sub) {
t = cmd->cmd_sub;
} else {
qtty_message(c->tty, "Invalid command table entry.\n");
return 1;
}
} else {
indent(i);
printf("%s unknown, options:\n", argv[i]);
printtable(t, i + 1);
return 1;
}
}
indent(i);
printf("options:\n");
printtable(t, i + 1);
return 1;
}