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/*
*
* Shell Help Command
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <rtems.h>
#include <rtems/error.h>
#include <rtems/shell.h>
#include "internal.h"
#include <string.h>
/*
* show the help for one command.
*/
static int rtems_shell_help_cmd(
const rtems_shell_cmd_t *shell_cmd
)
{
const char * pc;
int col,line;
if (!rtems_shell_can_see_cmd(shell_cmd)) {
return 0;
}
printf("%-12.12s - ",shell_cmd->name);
col = 14;
line = 1;
if (shell_cmd->alias) {
printf("is an <alias> for command '%s'",shell_cmd->alias->name);
} else if (shell_cmd->usage) {
pc = shell_cmd->usage;
while (*pc) {
switch(*pc) {
case '\r':
break;
case '\n':
putchar('\n');
col = 0;
break;
default:
putchar(*pc);
col++;
break;
}
pc++;
if (col>78) { /* What daring... 78?*/
if (*pc) {
putchar('\n');
col = 0;
}
}
if (!col && *pc) {
printf(" ");
col = 12;line++;
}
}
}
puts("");
return line;
}
/*
* show the help. The first command implemented.
* Can you see the header of routine? Known?
* The same with all the commands....
*/
static int rtems_shell_help(
int argc,
char * argv[]
)
{
int col,line,lines,arg;
char* lines_env;
rtems_shell_topic_t *topic;
lines_env = getenv("SHELL_LINES");
if (lines_env)
lines = strtol(lines_env, 0, 0);
else
lines = 16;
if (argc<2) {
printf("help: The topics are\n");
topic = rtems_shell_first_topic;
col = printf(" all");
while (topic) {
if (!col){
col = printf(" %s",topic->topic);
} else {
if ((col+strlen(topic->topic)+2)>78){
printf("\n");
col = printf(" %s",topic->topic);
} else {
col+= printf(", %s",topic->topic);
}
}
topic = topic->next;
}
printf("\n");
return 1;
}
line = 0;
for (arg = 1;arg<argc;arg++) {
const char *cur = argv[arg];
rtems_shell_cmd_t *shell_cmd;
if (lines && (line > lines)) {
printf("Press any key to continue...");
(void) getchar(); /* we only want to know a character was pressed */
printf("\n");
line = 0;
}
topic = rtems_shell_lookup_topic(cur);
if (topic == NULL) {
if ((shell_cmd = rtems_shell_lookup_cmd(cur)) == NULL) {
if (strcmp(cur, "all") != 0) {
printf(
"help: topic or cmd '%s' not found. Try <help> alone for a list\n",
cur
);
line++;
continue;
}
} else {
line+= rtems_shell_help_cmd(shell_cmd);
continue;
}
}
printf("help: list for the topic '%s'\n",cur);
line++;
shell_cmd = rtems_shell_first_cmd;
while (shell_cmd) {
if (topic == NULL || !strcmp(topic->topic,shell_cmd->topic))
line+= rtems_shell_help_cmd(shell_cmd);
if (lines && (line > lines)) {
printf("Press any key to continue...");
(void) getchar();
printf("\n");
line = 0;
}
shell_cmd = shell_cmd->next;
}
}
puts("");
return 0;
}
rtems_shell_cmd_t rtems_shell_HELP_Command = {
.name = "help",
.usage = "help [topic] # list of usage of commands",
.topic = "help",
.command = rtems_shell_help,
.mode = S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH
};
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