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/* $Id: path.c,v 1.2 2005/12/09 22:17:13 ryo_saeba Exp $ */ |
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#include <assert.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <global.h> |
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|
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#include "define.h" |
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#include "path.h" |
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|
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|
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#if 0 |
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/** |
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* Define DEBUG_PATH to enable debug output. |
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*/ |
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#define DEBUG_PATH |
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#endif |
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|
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#if 0 |
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/** |
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* Define TEST_PATH to compile this file as a stand-alone self-test application |
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* for the functions. |
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*/ |
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#define TEST_PATH |
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|
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#define LOG fprintf |
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#define llevDebug stderr |
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#define llevError stderr |
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#endif |
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|
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|
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char *path_combine(const char *src, const char *dst) { |
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char *p; |
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static char path[HUGE_BUF]; |
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|
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if (*dst == '/') { |
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/* absolute destination path => ignore source path */ |
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strcpy(path, dst); |
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} else { |
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/* relative destination path => add after last '/' of source */ |
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strcpy(path, src); |
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p = strrchr(path, '/'); |
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if (p != NULL) { |
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p++; |
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} else { |
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p = path; |
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if (*src == '/') |
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*p++ = '/'; |
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} |
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strcpy(p, dst); |
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} |
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|
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#if defined(DEBUG_PATH) |
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LOG(llevDebug, "path_combine(%s, %s) = %s\n", src, dst, path); |
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#endif |
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return(path); |
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} |
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|
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void path_normalize(char *path) { |
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char *p; /* points to the beginning of the path not yet processed; this is |
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either a path component or a path separator character */ |
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char *q; /* points to the end of the path component p points to */ |
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char *w; /* points to the end of the already normalized path; w <= p is |
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maintained */ |
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size_t len; /* length of current component (which p points to) */ |
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|
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#if defined(DEBUG_PATH) |
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LOG(llevDebug, "path_normalize: input '%s'\n", path); |
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#endif |
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|
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p = path; |
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w = p; |
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while (*p != '\0') { |
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|
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if (*p == '/') { |
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if ((w == path && *path == '/') || (w > path && w[-1] != '/')) |
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*w++ = '/'; |
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p++; |
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continue; |
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} |
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|
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q = strchr(p, '/'); |
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if (q == NULL) |
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q = p+strlen(p); |
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len = q-p; |
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assert(len > 0); |
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|
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#if defined(DEBUG_PATH) |
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LOG(llevDebug, "path_normalize: checking '%.*s'\n", (int)len, p); |
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#endif |
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|
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if (len == 1 && *p == '.') { |
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/* remove current component */ |
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} else if (len == 2 && memcmp(p, "..", 2) == 0) { |
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if (w == path || (w == path+3 && memcmp(path, "../", 3) == 0)) { |
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/* keep ".." at beginning of relative path ("../x" => "../x") */ |
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memmove(w, p, len); |
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w += len; |
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} else if (w == path+1 && *path == '/') { |
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/* remove ".." at beginning of absolute path ("/../x" => "/x") */ |
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} else { |
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/* remove both current component ".." and preceding one */ |
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if (w > path && w[-1] == '/') |
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w--; |
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while (w > path && w[-1] != '/') |
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w--; |
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} |
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} else { |
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/* normal component ==> add it */ |
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memmove(w, p, len); |
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w += len; |
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} |
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p = q; |
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#if defined(DEBUG_PATH) |
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LOG(llevDebug, "path_normalize: so far '%.*s'\n", (int)(w-path), path); |
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#endif |
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} |
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|
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/* remove trailing slashes, but keep the one at the start of the path */ |
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while (w > path+1 && w[-1] == '/') { |
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w--; |
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} |
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|
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*w = '\0'; |
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|
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#if defined(DEBUG_PATH) |
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LOG(llevDebug, "path_normalize: result '%s'\n", path); |
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#endif |
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} |
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|
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char *path_combine_and_normalize(const char *src, const char *dst) { |
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char *path; |
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|
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path = path_combine(src, dst); |
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path_normalize(path); |
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return(path); |
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} |
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|
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#if defined(TEST_PATH) |
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static void check_combine(const char *src, const char *dst, const char *exp) { |
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const char *res; |
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|
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fprintf(stderr, "path_combine(%s, %s) = ", src, dst); |
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res = path_combine(src, dst); |
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fprintf(stderr, "%s", res); |
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if (strcmp(res, exp) != 0) { |
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fprintf(stderr, ", should be %s\n", exp); |
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} else { |
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fprintf(stderr, " (OK)\n"); |
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} |
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} |
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|
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static void check_normalize(const char *path, const char *exp0) { |
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char tmp[HUGE_BUF]; |
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char exp[HUGE_BUF]; |
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strcpy(exp, exp0 == NULL ? path : exp0); |
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|
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strcpy(tmp, path); |
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fprintf(stderr, "path_normalize(%s) = ", tmp); |
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path_normalize(tmp); |
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fprintf(stderr, "%s", tmp); |
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if (strcmp(tmp, exp) != 0) { |
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fprintf(stderr, ", should be %s\n", exp); |
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} else { |
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fprintf(stderr, " (OK)\n"); |
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} |
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} |
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|
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static void check_combine_and_normalize(const char *src, const char *dst, const char *exp) { |
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const char *res; |
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|
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fprintf(stderr, "path_combine_and_normalize(%s, %s) = ", src, dst); |
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res = path_combine_and_normalize(src, dst); |
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fprintf(stderr, "%s", res); |
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if (strcmp(res, exp) != 0) { |
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fprintf(stderr, ", should be %s\n", exp); |
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} else { |
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fprintf(stderr, " (OK)\n"); |
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} |
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} |
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|
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int main() { |
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check_combine("/path1/file1", "/path2/file2", "/path2/file2"); |
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check_combine("path1/file1", "/path2/file2", "/path2/file2"); |
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check_combine("/path1/file1", "path2/file2", "/path1/path2/file2"); |
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check_combine("path1/file1", "path2/file2", "path1/path2/file2"); |
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check_combine("/path1", "/path2", "/path2"); |
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check_combine("path1", "/path2", "/path2"); |
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check_combine("/path1", "path2", "/path2"); |
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check_combine("path1", "path2", "path2"); |
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|
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check_normalize("", NULL); |
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check_normalize("/", NULL); |
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check_normalize("path1/file1", NULL); |
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check_normalize("/path1/file1", NULL); |
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check_normalize("/path1//file1", "/path1/file1"); |
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check_normalize("//path1/file1", "/path1/file1"); |
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check_normalize("///////x////////y///////z////////", "/x/y/z"); |
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check_normalize("/a/b/../c/d/../e/../../f/g/../h", "/a/f/h"); |
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check_normalize("//a//b//..//c//d//..//e//..//..//f//g//..//h", "/a/f/h"); |
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check_normalize("../a", NULL); |
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check_normalize("a/../../b", "../b"); |
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check_normalize("/../a", "/a"); |
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check_normalize("/a/../../b", "/b"); |
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check_normalize("./b/./c/.d/..e/./f", "b/c/.d/..e/f"); |
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check_normalize("/b/././././e", "/b/e"); |
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check_normalize(".", ""); /* maybe the result should be "."? */ |
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check_normalize("/.", "/"); |
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check_normalize("./", ""); /* maybe the result should be "."? */ |
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check_normalize("/a/b/..", "/a"); |
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check_normalize("/a/b/../..", "/"); |
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check_normalize("/a/b/../../..", "/"); |
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check_normalize("a/b/..", "a"); |
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check_normalize("a/b/../..", ""); |
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check_normalize("a/b/../../..", ".."); |
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|
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check_combine_and_normalize("/path1/file1", "/path2/file2", "/path2/file2"); |
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check_combine_and_normalize("path1/file1", "/path2/file2", "/path2/file2"); |
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check_combine_and_normalize("/path1/file1", "path2/file2", "/path1/path2/file2"); |
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check_combine_and_normalize("/path1", "/path2", "/path2"); |
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check_combine_and_normalize("path1", "/path2", "/path2"); |
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check_combine_and_normalize("/path1", "path2", "/path2"); |
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check_combine_and_normalize("/path1/file1/../u", "path2/x/../y/z/../a/b/..", "/path1/path2/y/a"); |
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check_combine_and_normalize("/path1/file1", "/path2//file2", "/path2/file2"); |
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check_combine_and_normalize("/path1/file1", "/..", "/"); |
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check_combine_and_normalize("/path1/file1", "../x", "/x"); |
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check_combine_and_normalize("/path1/file1", "../../../x", "/x"); |
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check_combine_and_normalize("/path1/file1", "/.x/..x/...x/x", "/.x/..x/...x/x"); |
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|
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return(0); |
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} |
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#endif |