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#include <camellia/path.h>
#include <camellia/syscalls.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <user/lib/elfload.h>
int errno = 0;
int fork(void) {
return _syscall_fork(0, NULL);
}
int close(handle_t h) {
return _syscall_close(h);
}
_Noreturn void exit(int c) {
_syscall_exit(c);
}
int execv(const char *path, char *const argv[]) {
FILE *file = fopen(path, "r");
char hdr[4] = {0};
if (!file)
return -1;
fread(hdr, 1, 4, file);
fseek(file, 0, SEEK_SET);
if (!memcmp("\x7f""ELF", hdr, 4)) {
elf_execf(file, (void*)argv, NULL);
fclose(file);
} else if (!memcmp("#!", hdr, 2)) {
char buf[256];
fseek(file, 2, SEEK_SET);
if (fgets(buf, sizeof buf, file)) {
const char *argv [] = {buf, path, NULL};
char *endl = strchr(buf, '\n');
if (endl) *endl = '\0';
execv(buf, (void*)argv);
}
}
errno = EINVAL;
return -1;
}
_Noreturn void abort(void) {
_syscall_exit(1);
}
static char *cwd = NULL, *cwd2 = NULL;
static size_t cwdcapacity = 0;
int chdir(const char *path) {
handle_t h;
char *tmp;
size_t len = absolutepath(NULL, path, 0) + 1; /* +1 for the trailing slash */
if (cwdcapacity < len) {
cwdcapacity = len;
if (cwd) {
cwd = realloc(cwd, len);
cwd2 = realloc(cwd2, len);
} else {
cwd = malloc(len);
cwd[0] = '/';
cwd[1] = '\0';
cwd2 = malloc(len);
cwd2[0] = '/';
cwd2[1] = '\0';
}
}
absolutepath(cwd2, path, cwdcapacity);
len = strlen(cwd2);
if (cwd2[len - 1] != '/') {
cwd2[len] = '/';
cwd2[len + 1] = '\0';
}
h = _syscall_open(cwd2, strlen(cwd2), 0);
if (h < 0) {
errno = ENOENT;
return -1;
}
_syscall_close(h);
tmp = cwd;
cwd = cwd2;
cwd2 = tmp;
return 0;
}
char *getcwd(char *buf, size_t size) {
const char *realcwd = cwd ? cwd : "/";
// TODO bounds checking
memcpy(buf, realcwd, strlen(realcwd) + 1);
return buf;
}
size_t absolutepath(char *out, const char *in, size_t size) {
const char *realcwd = cwd ? cwd : "/";
size_t len, pos = 0;
if (!in) return strlen(realcwd);
if (!(in[0] == '/')) {
len = strlen(realcwd);
if (pos + len <= size && out != realcwd)
memcpy(out + pos, realcwd, len);
pos += len;
if (realcwd[len - 1] != '/') {
if (pos + 1 <= size) out[pos] = '/';
pos++;
}
}
len = strlen(in);
if (pos + len <= size)
memcpy(out + pos, in, len);
pos += len;
if (pos <= size) {
pos = path_simplify(out, out, pos);
if (pos > 0) out[pos] = '\0';
}
if (pos + 1 <= size) out[pos] = '\0';
pos++;
return pos;
}
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