186 lines
3.7 KiB
C
186 lines
3.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <string.h>
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#include <limits.h>
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#include <errno.h>
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#include <dirent.h>
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#include <sys/types.h>
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#include "icmd.h"
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#define ICMDS_SIZE \
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(sizeof(g_icmds) / sizeof(g_icmds[0])) \
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#define ICMD(name) \
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{ \
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.cmd = #name, \
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.len = sizeof(#name) - 1, \
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.func = icmd_##name, \
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} \
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struct icmd
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{
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char *cmd;
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int len;
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int (*func)(int, char **);
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} g_icmds[] =
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{
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ICMD(help),
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ICMD(echo),
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ICMD(exit),
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ICMD(cls),
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ICMD(cd),
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ICMD(ls),
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};
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#define icmd_die(status, ...) \
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{ \
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_icmd_die(status, argv[0], __VA_ARGS__); \
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return status; \
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} \
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static void
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_icmd_die(int status, char *func, char *format, ...)
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{
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va_list args;
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va_start(args, format);
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if (status != 0)
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printf("%s: Error: ", func);
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vprintf(format, args);
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if (status != 0)
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putchar('!');
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putchar('\n');
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if (status < 0)
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perror("Reason");
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va_end(args);
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}
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int
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call_icmd(int argc, char **argv)
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{
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size_t i;
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for (i = 0; i < ICMDS_SIZE; i++)
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if (strncmp(g_icmds[i].cmd, argv[0], g_icmds[i].len) == 0)
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return g_icmds[i].func(argc, argv);
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return INT_MAX;
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}
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int
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icmd_help(int argc, char **argv)
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{
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size_t i;
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puts(
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"\n psh - poor man's shell"
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"\n "
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"\n internal commands: "
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);
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for (i = 0; i < ICMDS_SIZE; i++)
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printf(" - %s\n", g_icmds[i].cmd);
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putchar('\n');
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return 0;
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}
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int
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icmd_echo(int argc, char **argv)
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{
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int i;
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for (i = 1; i < argc; i++)
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printf("%s%c", argv[i], (argc - i != 1) ? ' ' : '\n');
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return 0;
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}
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int
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icmd_exit(int argc, char **argv)
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{
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puts("good bye!");
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exit(0);
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return 0;
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}
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int
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icmd_cls(int argc, char **argv)
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{
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int i = 24;
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while (i--)
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putchar('\n');
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return 0;
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}
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int
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icmd_cd(int argc, char **argv)
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{
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char def_path[] = ".";
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char *path = def_path;
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if (argc > 2)
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icmd_die(1, "too many arguments given");
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if (argc == 2)
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path = argv[1];
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if (chdir(path))
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icmd_die(-1, "could not change directory");
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return 0;
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}
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int
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icmd_ls(int argc, char **argv)
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{
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char def_path[] = ".";
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char *path = def_path;
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struct dirent *d;
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DIR *dir;
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int i = 1;
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if (argc > 1)
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path = argv[1];
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do
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{
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if ((dir = opendir(path)) == NULL)
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icmd_die(-1, "could not open directory '%s'", path);
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puts(path);
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while ((d = readdir(dir)) != NULL)
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/* don't print current directory '.' and parent directory '..' */
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if (!(d->d_name[0] == '.' && (d->d_name[1] == '\0' || d->d_name[1] == '.')))
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printf(" %s\n", d->d_name);
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closedir(dir);
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putchar('\n');
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path = argv[++i];
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} while (i < argc);
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return 0;
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}
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