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#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>
#ifndef PHP_WIN32
#include <unistd.h>
#endif
typedef unsigned int uint;
#ifdef PHP_WIN32
#define IS_SLASH(c) ((c) == '/' || (c) == '\\')
#define DEFAULT_SLASH '\\'
#define TOKENIZER_STRING "/\\"
#define IS_ABSOLUTE_PATH(path, len) \
(len >= 2 && isalpha(path[0]) && path[1] == ':')
static int php_check_dots(const char *element, uint n)
{
while (n-- > 0) if (element[n] != '.') break;
return (n != -1);
}
#define IS_DIRECTORY_UP(element, len) \
(len >= 2 && !php_check_dots(element, len))
#define IS_DIRECTORY_CURRENT(element, len) \
(len == 1 && ptr[0] == '.')
#define strtok_r(a, b, c) strtok((a), (b)) /* Temporary fix for Windows */
#else
#define IS_SLASH(c) ((c) == '/')
#define DEFAULT_SLASH '/'
#define TOKENIZER_STRING "/"
#endif
/* default macros */
#ifndef IS_ABSOLUTE_PATH
#define IS_ABSOLUTE_PATH(path, len) \
(IS_SLASH(path[0]))
#endif
#ifndef IS_DIRECTORY_UP
#define IS_DIRECTORY_UP(element, len) \
(len == 2 && memcmp(element, "..", 2) == 0)
#endif
#ifndef IS_DIRECTORY_CURRENT
#define IS_DIRECTORY_CURRENT(element, len) \
(len == 1 && ptr[0] == '.')
#endif
/* for now */
#define IS_DIR_OK(s) (1)
#ifndef IS_DIR_OK
#define IS_DIR_OK(state) (php_is_dir_ok(state) == 0)
#endif
typedef struct _cwd_state {
char *cwd;
uint cwd_length;
} cwd_state;
#ifndef PHP_WIN32
static int php_is_dir_ok(const cwd_state *state)
{
struct stat buf;
if (stat(state->cwd, &buf) == 0 && S_ISDIR(buf.st_mode))
return (0);
return (1);
}
#endif
char *virtual_getcwd(cwd_state *state, uint *length)
{
if (state->cwd_length == 0) {
char *retval;
*length = 1;
retval = (char *) malloc(2);
retval[0] = DEFAULT_SLASH;
retval[1] = '\0';
return retval;
}
#ifdef PHP_WIN32
/* If we have something like C: */
if (state->cwd_length == 2 && state->cwd[state->cwd_length-1] == ':') {
char *retval;
*length = state->cwd_length+1;
retval = (char *) malloc(*length+1);
memcpy(retval, state->cwd, *length);
retval[*length-1] = DEFAULT_SLASH;
retval[*length] = '\0';
return retval;
}
#endif
*length = state->cwd_length;
return strdup(state->cwd);
}
/* returns 0 for ok, 1 for error */
int virtual_chdir(cwd_state *state, char *path)
{
uint path_length = strlen(path);
char *ptr = path;
char *tok = NULL;
uint ptr_length;
cwd_state *old_state;
if (path_length == 0)
return (0);
old_state = (cwd_state *) malloc(sizeof(*old_state));
old_state->cwd = strdup(state->cwd);
old_state->cwd_length = state->cwd_length;
if (IS_ABSOLUTE_PATH(path, path_length)) {
state->cwd = (char *) malloc(1);
state->cwd[0] = '\0';
state->cwd_length = 0;
#ifdef PHP_WIN32
} else if(IS_SLASH(path[0])) {
state->cwd = (char *) malloc(3);
memcpy(state->cwd, old_state->cwd, 2);
state->cwd[2] = '\0';
state->cwd_length = 2;
#endif
}
ptr = strtok_r(path, TOKENIZER_STRING, &tok);
while (ptr) {
ptr_length = strlen(ptr);
if (IS_DIRECTORY_UP(ptr, ptr_length)) {
char save;
save = '\0';
#define PREVIOUS state->cwd[state->cwd_length - 1]
while (IS_ABSOLUTE_PATH(state->cwd, state->cwd_length) &&
!IS_SLASH(PREVIOUS)) {
save = PREVIOUS;
PREVIOUS = '\0';
state->cwd_length--;
}
if (!IS_ABSOLUTE_PATH(state->cwd, state->cwd_length)) {
state->cwd[state->cwd_length++] = save;
state->cwd[state->cwd_length] = '\0';
} else {
PREVIOUS = '\0';
state->cwd_length--;
}
} else if (!IS_DIRECTORY_CURRENT(ptr, ptr_length)) {
state->cwd = (char *) realloc(state->cwd, state->cwd_length+ptr_length+1+1);
state->cwd[state->cwd_length] = DEFAULT_SLASH;
memcpy(&state->cwd[state->cwd_length+1], ptr, ptr_length+1);
state->cwd_length += (ptr_length+1);
}
ptr = strtok_r(NULL, TOKENIZER_STRING, &tok);
}
if (!IS_DIR_OK(state)) {
free(state->cwd);
state->cwd = old_state->cwd;
state->cwd_length = old_state->cwd_length;
free(old_state);
return (1);
}
free(old_state->cwd);
free(old_state);
return (0);
}
void main(void)
{
cwd_state state;
uint length;
#ifndef PHP_WIN32
state.cwd = malloc(PATH_MAX + 1);
state.cwd_length = PATH_MAX;
while (getcwd(state.cwd, state.cwd_length) == NULL && errno == ERANGE) {
state.cwd_length <<= 1;
state.cwd = realloc(state.cwd, state.cwd_length + 1);
}
#else
state.cwd = strdup("d:\\foo\\bar");
state.cwd_length = strlen(state.cwd);
#endif
printf("%s\n", virtual_getcwd(&state, &length));
virtual_chdir(&state, strdup("/foo/barbara"));
printf("%s\n", virtual_getcwd(&state, &length));
virtual_chdir(&state, strdup("../andi"));
printf("%s\n", virtual_getcwd(&state, &length));
virtual_chdir(&state, strdup("../../..../.././.../foo/...../"));
printf("%s\n", virtual_getcwd(&state, &length));
virtual_chdir(&state, strdup("/////andi"));
printf("%s\n", virtual_getcwd(&state, &length));
virtual_chdir(&state, strdup("andi/././././././////bar"));
printf("%s\n", virtual_getcwd(&state, &length));
virtual_chdir(&state, strdup("../andi/../bar"));
printf("%s\n", virtual_getcwd(&state, &length));
}
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