440 lines
10 KiB
C
440 lines
10 KiB
C
// dvxPrefs.c — INI-based preferences system (read/write)
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//
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// Custom INI parser and writer. Stores entries as a dynamic array of
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// section/key/value triples using stb_ds. Preserves insertion order
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// on save so the file remains human-readable.
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#include "dvxPrefs.h"
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#include <ctype.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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// stb_ds dynamic arrays (implementation lives in libtasks.a)
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#include "thirdparty/stb_ds.h"
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// ============================================================
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// Internal types
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// ============================================================
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typedef struct {
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char *section;
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char *key;
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char *value;
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} PrefsEntryT;
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// Comment lines are stored to preserve them on save. A comment has
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// key=NULL and value=the full line text (including the ; prefix).
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// Section headers have key=NULL and value=NULL.
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static PrefsEntryT *sEntries = NULL; // stb_ds dynamic array
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static char *sFilePath = NULL; // path used by prefsLoad (for prefsSave)
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// ============================================================
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// Helpers
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// ============================================================
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static char *dupStr(const char *s) {
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if (!s) {
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return NULL;
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}
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size_t len = strlen(s);
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char *d = (char *)malloc(len + 1);
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if (d) {
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memcpy(d, s, len + 1);
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}
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return d;
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}
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static void freeEntry(PrefsEntryT *e) {
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free(e->section);
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free(e->key);
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free(e->value);
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e->section = NULL;
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e->key = NULL;
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e->value = NULL;
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}
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// Case-insensitive string compare
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static int strcmpci(const char *a, const char *b) {
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for (;;) {
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int d = tolower((unsigned char)*a) - tolower((unsigned char)*b);
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if (d != 0 || !*a) {
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return d;
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}
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a++;
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b++;
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}
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}
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// Find an entry by section+key (case-insensitive). Returns index or -1.
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static int32_t findEntry(const char *section, const char *key) {
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for (int32_t i = 0; i < arrlen(sEntries); i++) {
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PrefsEntryT *e = &sEntries[i];
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if (e->key && e->section &&
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strcmpci(e->section, section) == 0 &&
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strcmpci(e->key, key) == 0) {
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return i;
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}
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}
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return -1;
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}
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// Find the index of a section header entry. Returns -1 if not found.
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static int32_t findSection(const char *section) {
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for (int32_t i = 0; i < arrlen(sEntries); i++) {
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PrefsEntryT *e = &sEntries[i];
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if (!e->key && !e->value && e->section &&
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strcmpci(e->section, section) == 0) {
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return i;
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}
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}
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return -1;
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}
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// Trim leading/trailing whitespace in place. Returns pointer into buf.
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static char *trimInPlace(char *buf) {
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while (*buf == ' ' || *buf == '\t') {
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buf++;
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}
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char *end = buf + strlen(buf) - 1;
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while (end >= buf && (*end == ' ' || *end == '\t' || *end == '\r' || *end == '\n')) {
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*end-- = '\0';
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}
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return buf;
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}
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// ============================================================
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// prefsFree
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// ============================================================
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void prefsFree(void) {
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for (int32_t i = 0; i < arrlen(sEntries); i++) {
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freeEntry(&sEntries[i]);
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}
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arrfree(sEntries);
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sEntries = NULL;
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free(sFilePath);
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sFilePath = NULL;
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}
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// ============================================================
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// prefsGetBool
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// ============================================================
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bool prefsGetBool(const char *section, const char *key, bool defaultVal) {
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const char *val = prefsGetString(section, key, NULL);
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if (!val) {
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return defaultVal;
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}
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char c = (char)tolower((unsigned char)val[0]);
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if (c == 't' || c == 'y' || c == '1') {
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return true;
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}
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if (c == 'f' || c == 'n' || c == '0') {
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return false;
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}
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return defaultVal;
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}
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// ============================================================
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// prefsGetInt
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// ============================================================
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int32_t prefsGetInt(const char *section, const char *key, int32_t defaultVal) {
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const char *val = prefsGetString(section, key, NULL);
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if (!val) {
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return defaultVal;
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}
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char *end = NULL;
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long n = strtol(val, &end, 10);
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if (end == val) {
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return defaultVal;
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}
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return (int32_t)n;
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}
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// ============================================================
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// prefsGetString
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// ============================================================
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const char *prefsGetString(const char *section, const char *key, const char *defaultVal) {
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int32_t idx = findEntry(section, key);
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if (idx < 0) {
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return defaultVal;
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}
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return sEntries[idx].value;
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}
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// ============================================================
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// prefsLoad
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// ============================================================
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bool prefsLoad(const char *filename) {
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prefsFree();
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FILE *fp = fopen(filename, "rb");
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if (!fp) {
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return false;
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}
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sFilePath = dupStr(filename);
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char line[512];
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char *currentSection = dupStr("");
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while (fgets(line, sizeof(line), fp)) {
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// Strip trailing whitespace/newline
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char *end = line + strlen(line) - 1;
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while (end >= line && (*end == '\r' || *end == '\n' || *end == ' ' || *end == '\t')) {
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*end-- = '\0';
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}
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char *p = line;
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// Skip leading whitespace
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while (*p == ' ' || *p == '\t') {
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p++;
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}
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// Blank line — store as comment to preserve formatting
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if (*p == '\0') {
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PrefsEntryT e = {0};
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e.section = dupStr(currentSection);
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e.value = dupStr("");
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arrput(sEntries, e);
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continue;
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}
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// Comment line
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if (*p == ';' || *p == '#') {
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PrefsEntryT e = {0};
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e.section = dupStr(currentSection);
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e.value = dupStr(line);
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arrput(sEntries, e);
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continue;
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}
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// Section header
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if (*p == '[') {
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char *close = strchr(p, ']');
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if (close) {
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*close = '\0';
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free(currentSection);
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currentSection = dupStr(trimInPlace(p + 1));
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PrefsEntryT e = {0};
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e.section = dupStr(currentSection);
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arrput(sEntries, e);
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}
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continue;
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}
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// Key=value
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char *eq = strchr(p, '=');
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if (eq) {
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*eq = '\0';
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PrefsEntryT e = {0};
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e.section = dupStr(currentSection);
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e.key = dupStr(trimInPlace(p));
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e.value = dupStr(trimInPlace(eq + 1));
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arrput(sEntries, e);
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}
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}
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free(currentSection);
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fclose(fp);
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return true;
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}
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// ============================================================
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// prefsRemove
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// ============================================================
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void prefsRemove(const char *section, const char *key) {
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int32_t idx = findEntry(section, key);
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if (idx >= 0) {
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freeEntry(&sEntries[idx]);
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arrdel(sEntries, idx);
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}
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}
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// ============================================================
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// prefsSave
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// ============================================================
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bool prefsSave(void) {
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if (!sFilePath) {
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return false;
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}
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return prefsSaveAs(sFilePath);
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}
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// ============================================================
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// prefsSaveAs
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// ============================================================
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bool prefsSaveAs(const char *filename) {
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FILE *fp = fopen(filename, "wb");
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if (!fp) {
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return false;
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}
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const char *lastSection = "";
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for (int32_t i = 0; i < arrlen(sEntries); i++) {
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PrefsEntryT *e = &sEntries[i];
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// Comment or blank line (key=NULL, value=text or empty)
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if (!e->key && e->value) {
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fprintf(fp, "%s\r\n", e->value);
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continue;
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}
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// Section header (key=NULL, value=NULL)
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if (!e->key && !e->value) {
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fprintf(fp, "[%s]\r\n", e->section);
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lastSection = e->section;
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continue;
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}
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// Key=value
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if (e->key && e->value) {
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fprintf(fp, "%s = %s\r\n", e->key, e->value);
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}
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}
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fclose(fp);
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return true;
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}
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// ============================================================
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// prefsSetBool
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// ============================================================
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void prefsSetBool(const char *section, const char *key, bool value) {
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prefsSetString(section, key, value ? "true" : "false");
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}
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// ============================================================
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// prefsSetInt
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// ============================================================
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void prefsSetInt(const char *section, const char *key, int32_t value) {
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char buf[32];
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snprintf(buf, sizeof(buf), "%ld", (long)value);
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prefsSetString(section, key, buf);
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}
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// ============================================================
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// prefsSetString
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// ============================================================
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void prefsSetString(const char *section, const char *key, const char *value) {
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int32_t idx = findEntry(section, key);
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if (idx >= 0) {
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// Update existing entry
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free(sEntries[idx].value);
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sEntries[idx].value = dupStr(value);
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return;
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}
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// Find or create section header
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int32_t secIdx = findSection(section);
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if (secIdx < 0) {
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// Add blank line before new section (unless file is empty)
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if (arrlen(sEntries) > 0) {
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PrefsEntryT blank = {0};
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blank.section = dupStr(section);
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blank.value = dupStr("");
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arrput(sEntries, blank);
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}
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// Add section header
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PrefsEntryT secEntry = {0};
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secEntry.section = dupStr(section);
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arrput(sEntries, secEntry);
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secIdx = arrlen(sEntries) - 1;
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}
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// Find insertion point: after last entry in this section
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int32_t insertAt = secIdx + 1;
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while (insertAt < arrlen(sEntries)) {
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PrefsEntryT *e = &sEntries[insertAt];
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// Stop if we've hit a different section header
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if (!e->key && !e->value && e->section &&
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strcmpci(e->section, section) != 0) {
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break;
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}
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// Stop if we've hit an entry from a different section
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if (e->section && strcmpci(e->section, section) != 0) {
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break;
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}
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insertAt++;
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}
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// Insert new entry
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PrefsEntryT newEntry = {0};
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newEntry.section = dupStr(section);
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newEntry.key = dupStr(key);
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newEntry.value = dupStr(value);
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arrins(sEntries, insertAt, newEntry);
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}
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