100 lines
2.1 KiB
C
Executable File
100 lines
2.1 KiB
C
Executable File
#include <stdlib.h>
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#include <string.h>
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#include <linux/limits.h>
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#include <stdio.h>
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char *
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relativize_path(const char *path1, const char *path2)
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{
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char *spath1 = calloc(strlen(path1) + 2, sizeof(char));
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strcpy(spath1, path1);
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spath1[strlen(path1)] = '\0';
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if (spath1[strlen(path1) - 1] != '/') {
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strcat(spath1, "/");
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}
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char *res;
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if ((res = calloc(PATH_MAX, sizeof(char))) == NULL) {
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exit(1);
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}
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int i = 0;
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int ptr = 0;
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while (spath1[i] == path2[i] && spath1[i]) {
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if (spath1[i] == '/') {
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ptr = i;
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}
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i++;
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}
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int deep1 = 0;
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while (spath1[i]) {
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if (spath1[i] == '/') {
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deep1++;
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}
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i++;
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}
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if (!deep1 && path2[strlen(path2) - 1] == '/') {
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snprintf(res, PATH_MAX, ".");
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return res;
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}
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int deep2 = 0;
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i = ptr + 1;
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while (path2[i]) {
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if (path2[i] == '/') {
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deep2++;
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}
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i++;
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}
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for (int j = 0; j < deep1; j++) {
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res[j * 3] = '.';
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res[j * 3 + 1] = '.';
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res[j * 3 + 2] = '/';
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}
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if (deep2 == 0 && deep1) {
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if (res[strlen(res) - 1] == '/') {
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res[strlen(res) - 1] = '\0';
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}
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return res;
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}
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snprintf(res + deep1 * 3, PATH_MAX - deep1 * 3, "%s", path2 + ptr + 1);
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if (res[strlen(res) - 1] == '/') {
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res[strlen(res) - 1] = '\0';
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}
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return res;
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}
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int
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main()
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{
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const char *path1 = "/home/krosh/cmc/contest5";
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const char *path2 = "/home/krosh/cmc/contest5/subdir/file.txt";
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char *relative_path = relativize_path(path1, path2);
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printf("Relative path: %s\n", relative_path);
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const char *path3 = "/a/b/c/d";
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const char *path4 = "/a/e/f";
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printf("Relative path: %s\n", relativize_path(path3, path4));
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const char *path5 = "/a/f/g/h/j";
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const char *path6 = "/a/f/g/h";
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printf("Relative path: %s\n", relativize_path(path5, path6));
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const char *path7 = "/a";
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const char *path8 = "/a";
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printf("Relative path: %s\n", relativize_path(path7, path8));
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return 0;
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}
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