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/* $Id: path.c 4961 2006-09-21 05:14:18Z mwedel $ */
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <global.h>
#include "define.h"
#include "path.h"
#if 0
/**
* Define DEBUG_PATH to enable debug output.
*/
#define DEBUG_PATH
#endif
#if 0
/**
* Define TEST_PATH to compile this file as a stand-alone self-test application
* for the functions.
*/
#define TEST_PATH
#define LOG fprintf
#define llevDebug stderr
#define llevError stderr
#endif
char *path_combine(const char *src, const char *dst) {
char *p;
static char path[HUGE_BUF];
if (*dst == '/') {
/* absolute destination path => ignore source path */
strcpy(path, dst);
} else {
/* relative destination path => add after last '/' of source */
strcpy(path, src);
p = strrchr(path, '/');
if (p != NULL) {
p++;
} else {
p = path;
if (*src == '/')
*p++ = '/';
}
strcpy(p, dst);
}
#if defined(DEBUG_PATH)
LOG(llevDebug, "path_combine(%s, %s) = %s\n", src, dst, path);
#endif
return(path);
}
void path_normalize(char *path) {
char *p; /* points to the beginning of the path not yet processed; this is
either a path component or a path separator character */
char *q; /* points to the end of the path component p points to */
char *w; /* points to the end of the already normalized path; w <= p is
maintained */
size_t len; /* length of current component (which p points to) */
#if defined(DEBUG_PATH)
LOG(llevDebug, "path_normalize: input '%s'\n", path);
#endif
p = path;
w = p;
while (*p != '\0') {
if (*p == '/') {
if ((w == path && *path == '/') || (w > path && w[-1] != '/'))
*w++ = '/';
p++;
continue;
}
q = strchr(p, '/');
if (q == NULL)
q = p+strlen(p);
len = q-p;
assert(len > 0);
#if defined(DEBUG_PATH)
LOG(llevDebug, "path_normalize: checking '%.*s'\n", (int)len, p);
#endif
if (len == 1 && *p == '.') {
/* remove current component */
} else if (len == 2 && memcmp(p, "..", 2) == 0) {
if (w == path || (w == path+3 && memcmp(path, "../", 3) == 0)) {
/* keep ".." at beginning of relative path ("../x" => "../x") */
memmove(w, p, len);
w += len;
} else if (w == path+1 && *path == '/') {
/* remove ".." at beginning of absolute path ("/../x" => "/x") */
} else {
/* remove both current component ".." and preceding one */
if (w > path && w[-1] == '/')
w--;
while (w > path && w[-1] != '/')
w--;
}
} else {
/* normal component ==> add it */
memmove(w, p, len);
w += len;
}
p = q;
#if defined(DEBUG_PATH)
LOG(llevDebug, "path_normalize: so far '%.*s'\n", (int)(w-path), path);
#endif
}
/* remove trailing slashes, but keep the one at the start of the path */
while (w > path+1 && w[-1] == '/') {
w--;
}
*w = '\0';
#if defined(DEBUG_PATH)
LOG(llevDebug, "path_normalize: result '%s'\n", path);
#endif
}
char *path_combine_and_normalize(const char *src, const char *dst) {
char *path;
path = path_combine(src, dst);
path_normalize(path);
return(path);
}
#if defined(TEST_PATH)
static void check_combine(const char *src, const char *dst, const char *exp) {
const char *res;
fprintf(stderr, "path_combine(%s, %s) = ", src, dst);
res = path_combine(src, dst);
fprintf(stderr, "%s", res);
if (strcmp(res, exp) != 0) {
fprintf(stderr, ", should be %s\n", exp);
} else {
fprintf(stderr, " (OK)\n");
}
}
static void check_normalize(const char *path, const char *exp0) {
char tmp[HUGE_BUF];
char exp[HUGE_BUF];
strcpy(exp, exp0 == NULL ? path : exp0);
strcpy(tmp, path);
fprintf(stderr, "path_normalize(%s) = ", tmp);
path_normalize(tmp);
fprintf(stderr, "%s", tmp);
if (strcmp(tmp, exp) != 0) {
fprintf(stderr, ", should be %s\n", exp);
} else {
fprintf(stderr, " (OK)\n");
}
}
static void check_combine_and_normalize(const char *src, const char *dst, const char *exp) {
const char *res;
fprintf(stderr, "path_combine_and_normalize(%s, %s) = ", src, dst);
res = path_combine_and_normalize(src, dst);
fprintf(stderr, "%s", res);
if (strcmp(res, exp) != 0) {
fprintf(stderr, ", should be %s\n", exp);
} else {
fprintf(stderr, " (OK)\n");
}
}
int main() {
check_combine("/path1/file1", "/path2/file2", "/path2/file2");
check_combine("path1/file1", "/path2/file2", "/path2/file2");
check_combine("/path1/file1", "path2/file2", "/path1/path2/file2");
check_combine("path1/file1", "path2/file2", "path1/path2/file2");
check_combine("/path1", "/path2", "/path2");
check_combine("path1", "/path2", "/path2");
check_combine("/path1", "path2", "/path2");
check_combine("path1", "path2", "path2");
check_normalize("", NULL);
check_normalize("/", NULL);
check_normalize("path1/file1", NULL);
check_normalize("/path1/file1", NULL);
check_normalize("/path1//file1", "/path1/file1");
check_normalize("//path1/file1", "/path1/file1");
check_normalize("///////x////////y///////z////////", "/x/y/z");
check_normalize("/a/b/../c/d/../e/../../f/g/../h", "/a/f/h");
check_normalize("//a//b//..//c//d//..//e//..//..//f//g//..//h", "/a/f/h");
check_normalize("../a", NULL);
check_normalize("a/../../b", "../b");
check_normalize("/../a", "/a");
check_normalize("/a/../../b", "/b");
check_normalize("./b/./c/.d/..e/./f", "b/c/.d/..e/f");
check_normalize("/b/././././e", "/b/e");
check_normalize(".", ""); /* maybe the result should be "."? */
check_normalize("/.", "/");
check_normalize("./", ""); /* maybe the result should be "."? */
check_normalize("/a/b/..", "/a");
check_normalize("/a/b/../..", "/");
check_normalize("/a/b/../../..", "/");
check_normalize("a/b/..", "a");
check_normalize("a/b/../..", "");
check_normalize("a/b/../../..", "..");
check_combine_and_normalize("/path1/file1", "/path2/file2", "/path2/file2");
check_combine_and_normalize("path1/file1", "/path2/file2", "/path2/file2");
check_combine_and_normalize("/path1/file1", "path2/file2", "/path1/path2/file2");
check_combine_and_normalize("/path1", "/path2", "/path2");
check_combine_and_normalize("path1", "/path2", "/path2");
check_combine_and_normalize("/path1", "path2", "/path2");
check_combine_and_normalize("/path1/file1/../u", "path2/x/../y/z/../a/b/..", "/path1/path2/y/a");
check_combine_and_normalize("/path1/file1", "/path2//file2", "/path2/file2");
check_combine_and_normalize("/path1/file1", "/..", "/");
check_combine_and_normalize("/path1/file1", "../x", "/x");
check_combine_and_normalize("/path1/file1", "../../../x", "/x");
check_combine_and_normalize("/path1/file1", "/.x/..x/...x/x", "/.x/..x/...x/x");
return(0);
}
#endif
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