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113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
#include <string.h>
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#include <stdio.h>
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typedef unsigned int uint;
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#if WINDOWS
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# define IS_SLASH(c) ((c) == '/' || (c) == '\\')
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# define DEFAULT_SLASH '\\'
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# define TOKENIZER_STRING "/\\"
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#else
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# define IS_SLASH(c) ((c) == '/')
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# define DEFAULT_SLASH '/'
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# define TOKENIZER_STRING "/"
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#endif
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typedef struct _cwd_state {
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char *cwd;
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uint cwd_length;
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} cwd_state;
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char *virtual_getcwd(cwd_state *state, uint *length)
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{
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if (state->cwd_length == 0) {
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char *retval;
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*length = 1;
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retval = (char *) malloc(2);
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retval[0] = DEFAULT_SLASH;
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retval[1] = '\0';
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return retval;
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}
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#if WINDOWS
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/* If we have something like C: */
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if (state->cwd_length == 2 && state->cwd[state->cwd_length-1] == ':') {
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char *retval;
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*length = state->cwd_length+1;
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retval = (char *) malloc(*length+1);
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memcpy(retval, state->cwd, *length);
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retval[*length-1] = DEFAULT_SLASH;
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retval[*length] = '\0';
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return retval;
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}
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#endif
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*length = state->cwd_length;
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return strdup(state->cwd);
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}
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void virtual_chdir(cwd_state *state, char *path)
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{
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uint path_length = strlen(path);
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char *ptr = path;
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uint ptr_length;
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if (path_length == 0) {
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return;
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}
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#if WINDOWS
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/* Full path includes anything starting with C: */
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if (IS_SLASH(*ptr) || (path_length >= 2 && path[1] == ':'))
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#else
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if (IS_SLASH(*ptr))
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#endif
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{
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state->cwd = (char *) realloc(state->cwd, 1);
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state->cwd[0] = '\0';
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state->cwd_length = 0;
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}
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ptr = strtok(path, TOKENIZER_STRING);
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while(ptr) {
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ptr_length = strlen(ptr);
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if (ptr_length == 2 && !memcmp(ptr, "..", 2)) {
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while (!IS_SLASH(state->cwd[state->cwd_length-1])) {
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state->cwd[--(state->cwd_length)] = '\0';
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}
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state->cwd[--(state->cwd_length)] = '\0';
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} else if (ptr_length == 1 && *ptr == '.') {
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/* Do nothing */
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} else {
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state->cwd = (char *) realloc(state->cwd, state->cwd_length+ptr_length+1+1);
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state->cwd[state->cwd_length] = DEFAULT_SLASH;
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memcpy(&state->cwd[state->cwd_length+1], ptr, ptr_length+1);
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state->cwd_length += (ptr_length+1);
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}
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ptr = strtok(NULL, TOKENIZER_STRING);
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}
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}
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main()
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{
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cwd_state state;
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uint length;
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state.cwd = strdup("");
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state.cwd_length = 0;
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printf("%s\n", virtual_getcwd(&state, &length));
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virtual_chdir(&state, strdup("/foo/barbara"));
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printf("%s\n", virtual_getcwd(&state, &length));
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virtual_chdir(&state, strdup("../andi"));
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printf("%s\n", virtual_getcwd(&state, &length));
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virtual_chdir(&state, strdup("/////andi"));
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printf("%s\n", virtual_getcwd(&state, &length));
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virtual_chdir(&state, strdup("andi/././././././////bar"));
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printf("%s\n", virtual_getcwd(&state, &length));
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virtual_chdir(&state, strdup("../andi/../bar"));
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printf("%s\n", virtual_getcwd(&state, &length));
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}
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