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// Written by retoor@molodetz.nl
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// This header file contains utility functions for manipulating file system
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// paths, focusing primarily on expanding paths starting with '~' to the home
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// directory.
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// This code uses standard libraries: stdio.h, stdlib.h, and string.h, and
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// conditionally includes the posix libraries pwd.h and unistd.h when expanding
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// the home directory manually.
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// MIT License
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//
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// Permission is granted to use, copy, modify, merge, distribute, sublicense,
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// and/or sell copies of the Software. The license includes conditions about
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// providing a copy of the license and the limitation of liability and warranty.
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#ifndef UTILS_H
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#define UTILS_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <limits.h>
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#include <pwd.h>
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#include <unistd.h>
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#endif
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void get_current_directory() {
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char buffer[PATH_MAX];
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#ifdef _WIN32
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DWORD length = GetCurrentDirectory(PATH_MAX, buffer);
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if (length > 0 && length < PATH_MAX) {
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printf("Current Directory: %s\n", buffer);
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} else {
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printf("Error getting current directory.\n");
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}
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#else
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if (getcwd(buffer, sizeof(buffer)) != NULL) {
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printf("Current Directory: %s\n", buffer);
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} else {
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perror("Error getting current directory");
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}
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#endif
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}
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char *expand_home_directory(const char *path) {
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if (path[0] != '~') {
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return strdup(path); // Return the original path if it doesn't start with ~
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}
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char *home_dir;
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#ifdef _WIN32
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home_dir = getenv("USERPROFILE"); // Get home directory on Windows
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#else
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struct passwd *pw = getpwuid(getuid());
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home_dir = pw->pw_dir; // Get home directory on Linux
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#endif
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if (home_dir == NULL) {
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return NULL; // Error getting home directory
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}
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size_t home_len = strlen(home_dir);
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size_t path_len = strlen(path + 1);
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size_t expanded_size = home_len + path_len + 1;
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char *expanded_path = (char *)malloc(expanded_size);
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if (expanded_path == NULL) {
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return NULL;
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}
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memcpy(expanded_path, home_dir, home_len);
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memcpy(expanded_path + home_len, path + 1, path_len);
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expanded_path[home_len + path_len] = '\0';
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return expanded_path;
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}
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unsigned long hash(const char *str) {
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unsigned long hash = 5381; // Starting value
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int c;
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while ((c = *str++)) {
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hash = ((hash << 5) + hash) + c; // hash * 33 + c
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}
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return hash;
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}
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char *joinpath(const char *base_url, const char *path) {
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static char result[4096];
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size_t base_len = strlen(base_url);
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size_t pos = 0;
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if (base_len >= sizeof(result) - 2) {
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base_len = sizeof(result) - 2;
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}
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memcpy(result, base_url, base_len);
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pos = base_len;
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if (pos > 0 && result[pos - 1] != '/') {
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result[pos++] = '/';
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}
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if (path[0] == '/') {
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path++;
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}
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size_t path_len = strlen(path);
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if (pos + path_len >= sizeof(result)) {
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path_len = sizeof(result) - pos - 1;
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}
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memcpy(result + pos, path, path_len);
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result[pos + path_len] = '\0';
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return result;
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}
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char *read_file(const char *path) {
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char *expanded_path = expand_home_directory(path);
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if (expanded_path == NULL) {
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return NULL;
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}
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FILE *file = fopen(expanded_path, "r");
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free(expanded_path);
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if (file == NULL) {
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return NULL;
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}
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fseek(file, 0, SEEK_END);
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long size = ftell(file);
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fseek(file, 0, SEEK_SET);
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char *buffer = (char *)malloc(size + 1);
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size_t read = fread(buffer, 1, size, file);
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if (read == 0) {
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free(buffer);
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return NULL;
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}
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fclose(file);
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buffer[read] = '\0';
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return buffer;
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}
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#endif
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