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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>
static int rtems_shell_help_pause(int line, int lines) {
if (lines && line >= lines - 1) {
printf("\rPress any key to continue...");
(void) getchar();
printf("\r%*c\r", 29, ' ');
line = 0;
}
return line;
}
/*
* show the help for one command.
*/
static int rtems_shell_help_cmd(
const rtems_shell_cmd_t *shell_cmd, int indent, int line,
int cols, int lines
)
{
const char * pc;
int col;
if (!rtems_shell_can_see_cmd(shell_cmd)) {
return 0;
}
printf("%-*s - ", indent, shell_cmd->name);
indent += 3;
col = indent;
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':
if (*(pc + 1) != '\0') {
putchar('\n');
col = 0;
}
break;
default:
putchar(*pc);
col++;
break;
}
pc++;
if (col > (cols - 3)) {
if (*pc) {
putchar('\n');
col = 0;
}
}
if (col == 0 && *pc) {
line = rtems_shell_help_pause(line + 1, lines);
printf("%*c", indent, ' ');
col = indent;
}
}
}
puts("");
line = rtems_shell_help_pause(line + 1, lines);
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,cols,lines,arg,indent;
char *lines_env, *cols_env;
rtems_shell_topic_t *topic;
rtems_shell_cmd_t *shell_cmd;
lines = 16;
cols = 80;
lines_env = getenv("SHELL_LINES");
if (lines_env) {
lines = strtol(lines_env, 0, 0);
} else {
lines_env = getenv("LINES");
if (lines_env) {
lines = strtol(lines_env, 0, 0);
}
}
cols_env = getenv("COLUMNS");
if (cols_env) {
cols = strtol(cols_env, 0, 0);
}
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)>(cols - 2)){
printf("\n");
col = printf(" %s",topic->topic);
} else {
col+= printf(", %s",topic->topic);
}
}
topic = topic->next;
}
printf("\n");
return 1;
}
indent = 0;
shell_cmd = rtems_shell_first_cmd;
while (shell_cmd) {
size_t len = strlen(shell_cmd->name);
if (len > indent) {
indent = len;
}
shell_cmd = shell_cmd->next;
}
line = 0;
for (arg = 1;arg<argc;arg++) {
const char *cur = argv[arg];
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 = rtems_shell_help_pause(line + 1, lines);
continue;
}
} else {
line = rtems_shell_help_cmd(shell_cmd, indent, line, cols, lines);
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, indent, line, cols, lines);
}
shell_cmd = shell_cmd->next;
}
}
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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