Skip to content
Snippets Groups Projects
Select Git revision
  • main
  • branch1
2 results

tempCodeRunnerFile

Blame
  • abspath.c 4.40 KiB
    #include "cache.h"
    
    /*
     * Do not use this for inspecting *tracked* content.  When path is a
     * symlink to a directory, we do not want to say it is a directory when
     * dealing with tracked content in the working tree.
     */
    int is_directory(const char *path)
    {
    	struct stat st;
    	return (!stat(path, &st) && S_ISDIR(st.st_mode));
    }
    
    /* We allow "recursive" symbolic links. Only within reason, though. */
    #define MAXDEPTH 5
    
    /*
     * Return the real path (i.e., absolute path, with symlinks resolved
     * and extra slashes removed) equivalent to the specified path.  (If
     * you want an absolute path but don't mind links, use
     * absolute_path().)  The return value is a pointer to a static
     * buffer.
     *
     * The input and all intermediate paths must be shorter than MAX_PATH.
     * The directory part of path (i.e., everything up to the last
     * dir_sep) must denote a valid, existing directory, but the last
     * component need not exist.  If die_on_error is set, then die with an
     * informative error message if there is a problem.  Otherwise, return
     * NULL on errors (without generating any output).
     *
     * If path is our buffer, then return path, as it's already what the
     * user wants.
     */
    static const char *real_path_internal(const char *path, int die_on_error)
    {
    	static struct strbuf sb = STRBUF_INIT;
    	char *retval = NULL;
    
    	/*
    	 * If we have to temporarily chdir(), store the original CWD
    	 * here so that we can chdir() back to it at the end of the
    	 * function:
    	 */
    	struct strbuf cwd = STRBUF_INIT;
    
    	int depth = MAXDEPTH;
    	char *last_elem = NULL;
    	struct stat st;
    
    	/* We've already done it */
    	if (path == sb.buf)
    		return path;
    
    	if (!*path) {
    		if (die_on_error)
    			die("The empty string is not a valid path");
    		else
    			goto error_out;
    	}
    
    	strbuf_reset(&sb);
    	strbuf_addstr(&sb, path);
    
    	while (depth--) {
    		if (!is_directory(sb.buf)) {
    			char *last_slash = find_last_dir_sep(sb.buf);
    			if (last_slash) {
    				last_elem = xstrdup(last_slash + 1);
    				strbuf_setlen(&sb, last_slash - sb.buf + 1);
    			} else {
    				last_elem = xmemdupz(sb.buf, sb.len);
    				strbuf_reset(&sb);
    			}
    		}
    
    		if (sb.len) {
    			if (!cwd.len && strbuf_getcwd(&cwd)) {
    				if (die_on_error)
    					die_errno("Could not get current working directory");
    				else
    					goto error_out;
    			}
    
    			if (chdir(sb.buf)) {
    				if (die_on_error)
    					die_errno("Could not switch to '%s'",
    						  sb.buf);
    				else
    					goto error_out;
    			}
    		}
    		if (strbuf_getcwd(&sb)) {
    			if (die_on_error)
    				die_errno("Could not get current working directory");
    			else
    				goto error_out;
    		}
    
    		if (last_elem) {
    			if (sb.len && !is_dir_sep(sb.buf[sb.len - 1]))
    				strbuf_addch(&sb, '/');
    			strbuf_addstr(&sb, last_elem);
    			free(last_elem);
    			last_elem = NULL;
    		}
    
    		if (!lstat(sb.buf, &st) && S_ISLNK(st.st_mode)) {
    			struct strbuf next_sb = STRBUF_INIT;
    			ssize_t len = strbuf_readlink(&next_sb, sb.buf, 0);
    			if (len < 0) {
    				if (die_on_error)
    					die_errno("Invalid symlink '%s'",
    						  sb.buf);
    				else
    					goto error_out;
    			}
    			strbuf_swap(&sb, &next_sb);
    			strbuf_release(&next_sb);
    		} else
    			break;
    	}
    
    	retval = sb.buf;
    error_out:
    	free(last_elem);
    	if (cwd.len && chdir(cwd.buf))
    		die_errno("Could not change back to '%s'", cwd.buf);
    	strbuf_release(&cwd);
    
    	return retval;
    }
    
    const char *real_path(const char *path)
    {
    	return real_path_internal(path, 1);
    }
    
    const char *real_path_if_valid(const char *path)
    {
    	return real_path_internal(path, 0);
    }
    
    /*
     * Use this to get an absolute path from a relative one. If you want
     * to resolve links, you should use real_path.
     */
    const char *absolute_path(const char *path)
    {
    	static struct strbuf sb = STRBUF_INIT;
    	strbuf_reset(&sb);
    	strbuf_add_absolute_path(&sb, path);
    	return sb.buf;
    }
    
    /*
     * Unlike prefix_path, this should be used if the named file does
     * not have to interact with index entry; i.e. name of a random file
     * on the filesystem.
     */
    const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
    {
    	static struct strbuf path = STRBUF_INIT;
    #ifndef GIT_WINDOWS_NATIVE
    	if (!pfx_len || is_absolute_path(arg))
    		return arg;
    	strbuf_reset(&path);
    	strbuf_add(&path, pfx, pfx_len);
    	strbuf_addstr(&path, arg);
    #else
    	char *p;
    	/* don't add prefix to absolute paths, but still replace '\' by '/' */
    	strbuf_reset(&path);
    	if (is_absolute_path(arg))
    		pfx_len = 0;
    	else if (pfx_len)
    		strbuf_add(&path, pfx, pfx_len);
    	strbuf_addstr(&path, arg);
    	for (p = path.buf + pfx_len; *p; p++)
    		if (*p == '\\')
    			*p = '/';
    #endif
    	return path.buf;
    }