/* bijou HTTP server for plan 9 by sean caron (scaron@umich.edu) */ #include "main.h" // if this returns 0 then the path tries to go below the rootint check_directory_path(char *path) {    int i, d;	    d = 0;    // path depth counter    i = 1;    // position-within-path-string counter     while (1) {        /* hit end of string; stop */        if (i >= strlen(path)) {            break;        }         // doing this lookbehind should catch the case of multiple concurrent slashes in the path        if ((path[i] == '/') && (path[i-1] != '/' )) {            d = d + 1;            i = i + 1;        }         /* handle .. in middle of string */        else if ((path[i] == '.') && (path[i-1] == '/') && (path[i+1] == '.') && (path[i+2] == '/')) {            i = i + 3;            d = d - 1;        }         /* handle special case .. at end of string */        else if ((path[i] == '.') && (path[i-1] == '/') && (path[i+1] == '.') && ( (i+2) == strlen(path))) {            i = i + 3;            d = d - 1;        }         /* regular character */        else {            i = i + 1;        }         /* fallen below the root; stop */        if (d < 0) {            break;        }    }     return d;}