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// kat.cfg (kat.h)
// with love by czjstmax <jstmaxlol@disroot.org>
// header version 1
#pragma once
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifndef KAT
#define KAT
struct kat_api {
int (*create)(const char*);
int (*add)(const char*, const char*, const char*);
int (*read)(const char*, const char*, char*, size_t);
int (*del)(const char*, const char*);
int (*edit)(const char*, const char*, const char*);
int (*addComment)(const char*, const char*);
};
// Creates a file
int katcreate(const char *path) {
FILE *f = fopen(path, "w");
if (!f) return 1;
fclose(f);
return 0; // success
}
// Appends a key=val to file
int katadd(const char *key, const char *val, const char *path) {
FILE *f = fopen(path, "a");
if (f) {
fprintf(f, "%s=%s\n", key, val);
fclose(f);
return 0;
}
return 1;
}
// Appends a comment to file
int kataddcomment(const char *str, const char *path) {
FILE *f = fopen(path, "a");
if (f) {
fprintf(f, "#%s\n", str);
fclose(f);
return 0;
}
return 1;
}
// Reads a key from file
int katreadkey(const char *key, const char *path, char *buffer, size_t bufsize) {
FILE *f = fopen(path, "r");
if (!f) return 1;
char line[1024];
size_t key_len = strlen(key);
while (fgets(line, sizeof(line), f)) {
// TODO: skip leading whitespace maybe?
// check if line starts with key and '=' right after
if (strncmp(line, key, key_len) == 0 && line[key_len] == '=') {
if (line[0] == '#' || line[0] == ';' || line[0] == '\n') continue;
// copy everything after '=' until newline or buffer full (aka bad)
char *val_start = line + key_len + 1;
size_t len = strcspn(val_start, "\r\n"); // length until newline
if (len >= bufsize) len = bufsize - 1;
strncpy(buffer, val_start, len);
buffer[len] = '\0';
fclose(f);
return 0; // success
}
}
fclose(f);
return 1;
}
// Deletes a key from file
int katdelkey(const char *key, const char *path) {
FILE *f = fopen(path, "r");
if (!f) return 1;
char temp_path[1024];
snprintf(temp_path, sizeof(temp_path), "%s.tmp", path);
FILE *temp = fopen(temp_path, "w");
if (!temp) {
fclose(f);
return 1;
}
char line[1024];
size_t key_len = strlen(key);
int deleted = 0;
while (fgets(line, sizeof(line), f)) {
// skip line if it matches 'key='
if (strncmp(line, key, key_len) == 0 && line[key_len] == '=') {
deleted = 1;
continue;
}
fputs(line, temp);
}
fclose(f);
fclose(temp);
if (deleted) {
// replace original file with temp
if (remove(path) != 0) return 1;
if (rename(temp_path, path) != 0) return 1;
} else {
remove(temp_path);
}
return deleted ? 0 : 1; // 0 if deleted, 1 if not found
}
// Edits a key's value from file
int kateditkey(const char *key, const char *new_val, const char *path) {
FILE *f = fopen(path, "r");
if (!f) return 1;
char temp_path[1024];
snprintf(temp_path, sizeof(temp_path), "%s.tmp", path);
FILE *temp = fopen(temp_path, "w");
if (!temp) {
fclose(f);
return 1;
}
char line[1024];
size_t key_len = strlen(key);
int found = 0;
while (fgets(line, sizeof(line), f)) {
// skip leading whitespace for accurate matching
char *start = line;
while (*start == ' ' || *start == '\t') start++;
if (strncmp(start, key, key_len) == 0 && start[key_len] == '=') {
// replace line with new key=val
fprintf(temp, "%s=%s\n", key, new_val);
found = 1;
} else {
fputs(line, temp);
}
}
if (!found) {
// key not found, add it at the end
fprintf(temp, "%s=%s\n", key, new_val);
}
fclose(f);
fclose(temp);
if (remove(path) != 0) return 1;
if (rename(temp_path, path) != 0) return 1;
return 0;
}
struct kat_api kat = {
.create = katcreate,
.add = katadd,
.read = katreadkey,
.del = katdelkey,
.edit = kateditkey,
.addComment = kataddcomment,
};
#endif
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