// Minimal INI parser. This file accepts the small configuration dialect used by boot.ini and drivers.ini.

#include <string.h>
#include <common/ini_parser.h>

// Checks whether ws.
static inline int IsWs(char c) { return c == ' ' || c == '\t' || c == '\r'; }

// Implements the trim Left operation.
static char* TrimLeft(char* s) {
    while (*s && IsWs(*s)) s++;
    return s;
}

// Implements the trim Right operation.
static void TrimRight(char* s) {
    char* e = s + strlen(s);
    while (e > s && IsWs(*(e-1))) *--e = '\0';
}

// Parse 'buf' (null-terminated) for [section] / key=value.
// Calls cb(section, key, value, userdata) for each key found.
void IniParse(char* buf, IniCallback cb, void* userdata) {
    char section[64] = "";
    char* line = buf;

    while (*line) {
        char* end = line;
        while (*end && *end != '\n') end++;
        char saved = *end;
        *end = '\0';

        char* p = TrimLeft(line);
        if (*p == '[') {
            p++;
            char* close = strchr(p, ']');
            if (close) { *close = '\0'; strncpy(section, p, 63); section[63] = '\0'; }
        } else if (*p && *p != ';' && *p != '#') {
            char* eq = strchr(p, '=');
            if (eq) {
                *eq = '\0';
                char* key = p; TrimRight(key);
                char* val = TrimLeft(eq + 1); TrimRight(val);
                cb(section, key, val, userdata);
            } else {
                // Key with no value (e.g., a driver filename in drivers.ini).
                TrimRight(p);
                if (*p) cb(section, p, "", userdata);
            }
        }

        *end = saved;
        line = end + (*end ? 1 : 0);
    }
}