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#include "builtins.h"
#include "shell.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define DEFAULT_ARGV(...) \
char *_argv_default[] = {argv[0], __VA_ARGS__}; \
if (argc <= 1) { \
argc = sizeof(_argv_default) / sizeof(*_argv_default); \
argv = _argv_default; \
}
static void cmd_cat(int argc, char **argv) {
const size_t buflen = 4096;
char *buf = malloc(buflen);
DEFAULT_ARGV("!stdin");
for (int i = 1; i < argc; i++) {
FILE *file = fopen(argv[i], "r");
if (!file) {
eprintf("couldn't open %s", argv[i]);
return;
}
for (;;) {
int len = fread(buf, 1, sizeof buf, file);
if (len <= 0) break;
fwrite(buf, 1, len, stdout);
}
fclose(file);
}
}
static void cmd_echo(int argc, char **argv) {
bool newline = true;
int i = 1;
if (!strcmp("-n", argv[i])) {
i++;
newline = false;
}
printf("%s", argv[i++]);
for (; i < argc; i++)
printf(" %s", argv[i]);
if (newline)
printf("\n");
}
void cmd_hexdump(int argc, char **argv) {
const size_t buflen = 512;
uint8_t *buf = malloc(buflen);
FILE *file;
int len;
DEFAULT_ARGV("!stdin");
for (int i = 1; i < argc; i++) {
file = fopen(argv[i], "r");
if (!file) {
eprintf("couldn't open %s", argv[i]);
return;
}
len = fread(buf, 1, buflen, file);
fclose(file);
for (int i = 0; i < len; i += 16) {
printf("%08x ", i);
for (int j = i; j < i + 8 && j < len; j++)
printf("%02x ", buf[j]);
printf(" ");
for (int j = i + 8; j < i + 16 && j < len; j++)
printf("%02x ", buf[j]);
printf(" |");
for (int j = i; j < i + 16 && j < len; j++) {
char c = '.';
if (0x20 <= buf[j] && buf[j] < 0x7f) c = buf[j];
printf("%c", c);
}
printf("|\n");
}
}
}
static void cmd_ls(int argc, char **argv) {
FILE *file;
const size_t buflen = 4096;
char *buf = malloc(buflen);
DEFAULT_ARGV("/");
for (int i = 1; i < argc; i++) {
char *path = (void*)argv[i];
int pathlen = strlen(path);
if (!pathlen || path[pathlen - 1] != '/') {
memcpy(buf, path, pathlen);
buf[pathlen] = '/';
buf[pathlen+1] = '\0';
path = buf;
}
file = fopen(path, "r");
if (!file) {
eprintf("couldn't open %s", argv[i]);
return;
}
for (;;) {
int len = fread(buf, 1, sizeof buf, file);
if (len <= 0) break;
for (int i = 0; i < len; i++)
if (buf[i] == '\0') buf[i] = '\n';
fwrite(buf, 1, len, stdout);
}
fclose(file);
}
}
static void cmd_sleep(int argc, char **argv) {
if (argc < 2) {
eprintf("no arguments");
return;
}
_syscall_sleep(strtol(argv[1], NULL, 0) * 1000);
}
static void cmd_touch(int argc, char **argv) {
if (argc <= 1) {
eprintf("no arguments");
return;
}
for (int i = 1; i < argc; i++) {
FILE *f = fopen(argv[i], "a");
if (!f) eprintf("couldn't touch %s\n", argv[i]);
fclose(f);
}
}
struct builtin builtins[] = {
{"cat", cmd_cat},
{"echo", cmd_echo},
{"hexdump", cmd_hexdump},
{"ls", cmd_ls},
{"sleep", cmd_sleep},
{"touch", cmd_touch},
{NULL, NULL},
};
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