Small utility collection for dealing with file archives that have dependencies
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/* SPDX-License-Identifier: ISC */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "command.h"
extern char *__progname;
static command_t *commands;
void command_register(command_t *cmd)
{
cmd->next = commands;
commands = cmd;
}
command_t *command_by_name(const char *name)
{
command_t *cmd;
for (cmd = commands; cmd != NULL; cmd = cmd->next) {
if (strcmp(cmd->cmd, name) == 0)
break;
}
return cmd;
}
void usage(int status)
{
FILE *stream = (status == EXIT_SUCCESS ? stdout : stderr);
int padd = 0, len;
command_t *cmd;
fprintf(stream, "usage: %s <command> [args...]\n\n"
"Available commands:\n\n", __progname);
for (cmd = commands; cmd != NULL; cmd = cmd->next) {
len = strlen(cmd->cmd);
padd = len > padd ? len : padd;
}
for (cmd = commands; cmd != NULL; cmd = cmd->next) {
fprintf(stream, "%*s - %s\n",
(int)padd + 1, cmd->cmd, cmd->s_desc);
}
fprintf(stream, "\nTry `%s help <command>' for more information "
"on a specific command\n", __progname);
exit(status);
}
void tell_read_help(const char *cmd)
{
fprintf(stderr, "Try `%s help %s' for more information.\n",
__progname, cmd);
}
int check_arguments(const char *cmd, int argc, int minc, int maxc)
{
if (argc >= minc && argc <= maxc)
return 0;
fprintf(stderr, "Too %s arguments for `%s'\n",
argc > maxc ? "many" : "few", cmd);
tell_read_help(cmd);
return -1;
}