mirror of https://github.com/moparisthebest/wget
[svn] Rewrite path_simplify.
Published in <sxspu5nx2yi.fsf@florida.arsdigita.de>.
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hniksic
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0e72aa6e13
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@ -1,3 +1,8 @@
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2001-12-10 Hrvoje Niksic <hniksic@arsdigita.com>
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* utils.c (path_simplify): Rewrite, with better comments, and
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without the use of strcpy to move overlapping blocks.
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2001-12-09 Hrvoje Niksic <hniksic@arsdigita.com>
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* init.c (cmd_spec_progress): Resurrect. Check whether VAL is a
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317
src/utils.c
317
src/utils.c
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@ -473,163 +473,125 @@ fork_to_background (void)
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}
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#endif /* not WINDOWS */
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#if 0
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/* debug */
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char *
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ps (char *orig)
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{
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char *r = xstrdup (orig);
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path_simplify (r);
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return r;
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}
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#endif
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/* Resolve "." and ".." elements of PATH by destructively modifying
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PATH. "." is resolved by removing that path element, and ".." is
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resolved by removing the preceding path element. Leading and
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trailing slashes are preserved.
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/* Canonicalize PATH, and return a new path. The new path differs from PATH
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in that:
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Multple `/'s are collapsed to a single `/'.
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Leading `./'s and trailing `/.'s are removed.
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Trailing `/'s are removed.
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Non-leading `../'s and trailing `..'s are handled by removing
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portions of the path.
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Return non-zero if any changes have been made.
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E.g. "a/b/c/./../d/.." will yield "a/b/". This function originates
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from GNU Bash and has been mutilated to unrecognition for use in
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Wget.
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For example, "a/b/c/./../d/.." will yield "a/b/". More exhaustive
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test examples are provided below. If you change anything in this
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function, run test_path_simplify to make sure you haven't broken a
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test case.
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Changes for Wget:
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Always use '/' as stub_char.
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Don't check for local things using canon_stat.
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Change the original string instead of strdup-ing.
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React correctly when beginning with `./' and `../'.
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Don't zip out trailing slashes.
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Return a value indicating whether any modifications took place.
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If you dare change this function, take a careful look at the test
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cases below, and make sure that they pass. */
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A previous version of this function was based on path_simplify()
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from GNU Bash, but it has been rewritten for Wget 1.8.1. */
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int
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path_simplify (char *path)
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{
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register int i, start;
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int changes = 0;
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if (!*path)
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return 0;
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int change = 0;
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char *p, *end;
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if (path[0] == '/')
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/* Preserve initial '/'. */
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++path;
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++path; /* preserve the leading '/'. */
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/* Nix out leading `.' or `..' with. */
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if ((path[0] == '.' && path[1] == '\0')
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|| (path[0] == '.' && path[1] == '.' && path[2] == '\0'))
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{
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path[0] = '\0';
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changes = 1;
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return changes;
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}
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p = path;
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end = p + strlen (p) + 1; /* position past the terminating zero. */
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/* Walk along PATH looking for things to compact. */
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i = 0;
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while (1)
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{
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if (!path[i])
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break;
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again:
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/* P should point to the beginning of a path element. */
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while (path[i] && path[i] != '/')
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i++;
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start = i++;
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/* If we didn't find any slashes, then there is nothing left to do. */
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if (!path[start])
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break;
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/* Handle multiple `/'s in a row. */
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while (path[i] == '/')
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i++;
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if ((start + 1) != i)
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if (*p == '.' && (*(p + 1) == '/' || *(p + 1) == '\0'))
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{
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strcpy (path + start + 1, path + i);
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i = start + 1;
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changes = 1;
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}
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/* Check for `../', `./' or trailing `.' by itself. */
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if (path[i] == '.')
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{
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/* Handle trailing `.' by itself. */
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if (!path[i + 1])
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/* Handle "./foo" by moving "foo" two characters to the
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left. */
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if (*(p + 1) == '/')
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{
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path[--i] = '\0';
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changes = 1;
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change = 1;
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memmove (p, p + 2, end - p);
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end -= 2;
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goto again;
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}
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else
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{
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change = 1;
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*p = '\0';
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break;
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}
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}
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else if (*p == '.' && *(p + 1) == '.'
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&& (*(p + 2) == '/' || *(p + 2) == '\0'))
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{
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/* Handle "../foo" by moving "foo" one path element to the
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left. */
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char *b = p;
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/* Backtrack by one path element, but not past the beginning
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of PATH. */
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/* foo/bar/../baz */
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/* ^ p */
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/* ^ b */
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if (b > path + 1)
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{
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/* Find the character preceded by slash or by the
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beginning of path. */
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for (--b; b > path && *(b - 1) != '/'; b--)
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;
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}
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change = 1;
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if (*(p + 2) == '/')
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{
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memmove (b, p + 3, end - (p + 3));
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end -= (p + 3) - b;
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p = b;
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}
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else
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{
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*b = '\0';
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break;
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}
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/* Handle `./'. */
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if (path[i + 1] == '/')
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goto again;
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}
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else if (*p == '/')
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{
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/* Remove empty path elements. Not mandated by rfc1808 et
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al, but empty path elements are not all that useful, and
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the rest of Wget might not deal with them well. */
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char *q = p;
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while (*q == '/')
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++q;
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change = 1;
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if (*q == '\0')
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{
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strcpy (path + i, path + i + 1);
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i = (start < 0) ? 0 : start;
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changes = 1;
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continue;
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*p = '\0';
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break;
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}
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memmove (p, q, end - q);
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end -= q - p;
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goto again;
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}
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/* Handle `../' or trailing `..' by itself. */
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if (path[i + 1] == '.' &&
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(path[i + 2] == '/' || !path[i + 2]))
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{
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while (--start > -1 && path[start] != '/');
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strcpy (path + start + 1, path + i + 2 + (start == -1 && path[i + 2]));
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i = (start < 0) ? 0 : start;
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changes = 1;
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continue;
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}
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} /* path == '.' */
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} /* while */
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/* Addition: Remove all `./'-s and `../'-s preceding the string. */
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i = 0;
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while (1)
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{
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if (path[i] == '.' && path[i + 1] == '/')
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i += 2;
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else if (path[i] == '.' && path[i + 1] == '.' && path[i + 2] == '/')
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i += 3;
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else
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/* Skip to the next path element. */
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while (*p && *p != '/')
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++p;
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if (*p == '\0')
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break;
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}
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if (i)
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{
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strcpy (path, path + i - 0);
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changes = 1;
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/* Make sure P points to the beginning of the next path element,
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which is location after the slash. */
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++p;
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}
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return changes;
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return change;
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}
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/* Test cases:
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ps("") -> ""
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ps("/") -> "/"
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ps(".") -> ""
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ps("..") -> ""
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ps("/.") -> "/"
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ps("/..") -> "/"
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ps("foo") -> "foo"
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ps("foo/bar") -> "foo/bar"
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ps("foo//bar") -> "foo/bar" (possibly a bug)
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ps("foo/../bar") -> "bar"
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ps("foo/bar/..") -> "foo/"
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ps("foo/bar/../x") -> "foo/x"
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ps("foo/bar/../x/") -> "foo/x/"
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ps("foo/..") -> ""
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ps("/foo/..") -> "/"
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ps("a/b/../../c") -> "c"
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ps("/a/b/../../c") -> "/c"
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ps("./a/../b") -> "b"
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ps("/./a/../b") -> "/b"
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*/
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/* "Touch" FILE, i.e. make its atime and mtime equal to the time
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specified with TM. */
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@ -1846,3 +1808,96 @@ debug_test_md5 (char *buf)
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return res;
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}
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#endif
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#if 0
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/* Debugging and testing support for path_simplify. */
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/* Debug: run path_simplify on PATH and return the result in a new
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string. Useful for calling from the debugger. */
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static char *
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ps (char *path)
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{
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char *copy = xstrdup (path);
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path_simplify (copy);
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return copy;
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}
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static void
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run_test (char *test, char *expected_result, int expected_change)
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{
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char *test_copy = xstrdup (test);
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int modified = path_simplify (test_copy);
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if (0 != strcmp (test_copy, expected_result))
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{
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printf ("Failed path_simplify(\"%s\"): expected \"%s\", got \"%s\".\n",
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test, expected_result, test_copy);
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}
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if (modified != expected_change)
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{
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if (expected_change == 1)
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printf ("Expected no modification with path_simplify(\"%s\").\n",
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test);
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else
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printf ("Expected modification with path_simplify(\"%s\").\n",
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test);
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}
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xfree (test_copy);
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}
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static void
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test_path_simplify (void)
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{
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static struct {
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char *test, *result;
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int should_modify;
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} tests[] = {
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{ "", "", 0 },
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{ ".", "", 1 },
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{ "..", "", 1 },
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{ "foo", "foo", 0 },
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{ "foo/bar", "foo/bar", 0 },
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{ "foo///bar", "foo/bar", 1 },
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{ "foo/.", "foo/", 1 },
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{ "foo/./", "foo/", 1 },
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{ "foo./", "foo./", 0 },
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{ "foo/../bar", "bar", 1 },
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{ "foo/../bar/", "bar/", 1 },
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{ "foo/bar/..", "foo/", 1 },
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{ "foo/bar/../x", "foo/x", 1 },
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{ "foo/bar/../x/", "foo/x/", 1 },
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{ "foo/..", "", 1 },
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{ "foo/../..", "", 1 },
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{ "a/b/../../c", "c", 1 },
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{ "./a/../b", "b", 1 }
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};
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int i;
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for (i = 0; i < ARRAY_SIZE (tests); i++)
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{
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char *test = tests[i].test;
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char *expected_result = tests[i].result;
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int expected_change = tests[i].should_modify;
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run_test (test, expected_result, expected_change);
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}
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/* Now run all the tests with a leading slash before the test case,
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to prove that the slash is being preserved. */
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for (i = 0; i < ARRAY_SIZE (tests); i++)
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{
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char *test, *expected_result;
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int expected_change = tests[i].should_modify;
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test = xmalloc (1 + strlen (tests[i].test) + 1);
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sprintf (test, "/%s", tests[i].test);
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expected_result = xmalloc (1 + strlen (tests[i].result) + 1);
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sprintf (expected_result, "/%s", tests[i].result);
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run_test (test, expected_result, expected_change);
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xfree (test);
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xfree (expected_result);
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}
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}
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#endif
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