clib/include/iini.h

#ifndef _IINI_H_
#define _IINI_H_

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "sysenv.h"
#if _OS_WIN
#ifndef strcasecmp
#define strcasecmp _stricmp
#endif
#ifndef strncasecmp
#define strncasecmp _strnicmp
#endif
#elif _OS_LINUX
#include <strings.h>
#else
#error "Not Supported Operator System"
#endif

#ifndef INICHAR
#define INICHAR char
#endif

#if !defined INI_BUFFER_SIZE
#define INI_BUFFER_SIZE  512
#endif

#ifdef __cplusplus
extern "C" {
#endif

static int ini_get_str(const INICHAR* filename, const INICHAR* section, const INICHAR* key,
	const INICHAR* def_vaule, INICHAR* buf, size_t szbuf);

static inline INICHAR* _ini_skip_leading(const INICHAR* str)
{
	assert(str != NULL);
	while ('\0' < *str && *str <= ' ')
		str++;
	return (INICHAR*)str;
}

static inline INICHAR* _ini_skip_trailing(const INICHAR* str, const INICHAR* base)
{
	assert(str != NULL);
	assert(base != NULL);
	while (str > base && '\0' < *(str - 1) && *(str - 1) <= ' ')
		str--;
	return (INICHAR*)str;
}

static INICHAR* _ini_str_skip_trailing(INICHAR* str)
{
	INICHAR* ptr = _ini_skip_trailing(strchr(str, '\0'), str);
	assert(ptr != NULL);
	*ptr = '\0';
	return str;
}

static void _ini_clean_string(INICHAR** start_pptr, INICHAR** end_pptr) {
	/* Remove a trailing comment */
	int is_string = 0;
	*start_pptr = _ini_skip_leading(*end_pptr + 1);
	for (*end_pptr = *start_pptr; **end_pptr != '#' && **end_pptr != ';' && **end_pptr != '\0'; *end_pptr += 1) {
		if (**end_pptr == '"') {
			if (*(*end_pptr + 1) == '"') {
				*end_pptr += 1; /* skip "" (both quotes) */
			}
			else {
				is_string = !is_string;/* single quote, toggle isstring */
			}
		}
		else if (*(*end_pptr) == '\\' && *(*end_pptr + 1) == '"') {
			*end_pptr += 1; /* skip \" (both quotes */
		}
	}
	**end_pptr = ' ';
	*end_pptr = _ini_skip_trailing(*end_pptr, *start_pptr);
	**end_pptr = '\0';

	/* Remove double quotes surrounding a value */
	if (**start_pptr == '"' && *(*end_pptr - 1) == '"') {
		*end_pptr -= 1;
		*start_pptr += 1;
		**end_pptr = '\0';
	}
}

static inline int _ini_str_get_section(INICHAR **start_pptr, INICHAR **end_pptr,
	INICHAR* buf, size_t szbuf) {
	*start_pptr = _ini_skip_leading(buf);
	*end_pptr = strchr(buf, ']');
	if (**start_pptr != '[' || *end_pptr == NULL) {
		return -1;
	}
	/* When arrived here, a section was found; now optionally skip leading and
	 * trailing whitespace.
	 */
	assert(*start_pptr != NULL && **start_pptr == '[');
	*start_pptr = _ini_skip_leading(*start_pptr + 1);
	assert(*end_pptr != NULL && **end_pptr == ']');
	*end_pptr = _ini_skip_trailing(*end_pptr, *start_pptr);
	return 0;
}

static inline int _ini_str_get_key(INICHAR** start_pptr, INICHAR** end_pptr,
	INICHAR* buf, size_t szbuf) {
	*start_pptr = _ini_skip_leading(buf);
	if (**start_pptr == '[' || **start_pptr == '#' || **start_pptr == ':') return -1;

	*end_pptr = strchr(*start_pptr, '=');  /* Parse out the equal sign */
	if (*end_pptr == NULL) *end_pptr = strchr(*start_pptr, ':');
	if (*end_pptr == NULL) return -1;
	return 0;
}

static int _int_get_all_string(FILE* fp, const INICHAR* section, const INICHAR* key,
	int idx_section, int idx_key, INICHAR* buf, size_t szbuf) {
	int len = 0, idx = 0;
	INICHAR* start_ptr, * end_ptr;
	INICHAR local_buf[INI_BUFFER_SIZE] = { 0 };

	assert(fp != NULL);
	len = (section != NULL) ? (int)strlen(section) : 0;
	/* Move through file 1 line at a time until a section is matched or EOF. If
	 * parameter Section is NULL, only look at keys above the first section. If
	 * idxSection is positive, copy the relevant section name.
	 */
	if (len > 0 || idx_section >= 0) {
		assert(idx_section >= 0 || section != NULL);
		idx = -1;
		do {
			if (fgets(local_buf, INI_BUFFER_SIZE, fp) == NULL) return -1;
			if (_ini_str_get_section(&start_ptr, &end_ptr, local_buf, INI_BUFFER_SIZE) != 0) continue;
		} while (!((int)(end_ptr - start_ptr) == len && section != NULL && strncasecmp(start_ptr, section, len) == 0));
	}
	/* Now that the section has been found, find the entry.
	 * Stop searching upon leaving the section's area.
	 */
	assert(key != NULL || idx_key >= 0);
	len = (key != NULL) ? (int)strlen(key) : 0;
	idx = -1;
	do {
		if (fgets(local_buf, INI_BUFFER_SIZE, fp) == NULL) return -1;
		if (_ini_str_get_key(&start_ptr, &end_ptr, local_buf, INI_BUFFER_SIZE) != 0) continue;
	} while (len != 0 && strncasecmp(start_ptr, key, len) != 0);

	_ini_clean_string(&start_ptr, &end_ptr);
	/* Copy up to BufferSize chars to buffer */
	strncpy(buf, start_ptr, szbuf);
	return 0;
}

static int ini_get_str(const INICHAR* filename, const INICHAR* section, const INICHAR* key,
	const INICHAR* def_vaule, INICHAR* buf, size_t szbuf) {
	FILE* fp = NULL;
	int res = -1;

	if (fp = fopen(filename, "rb")) {
		res = _int_get_all_string(fp, section, key, -1, -1, buf, szbuf);
		fclose(fp);
	}

	if (res != 0) {
		strncpy(buf, ((def_vaule == NULL) ? (const char*)"" : def_vaule), szbuf);
		buf[szbuf] = '\0';
	}
	res = strlen(buf);
	return res;
}

#ifdef __cplusplus
}
#endif

/*  minIni - Multi-Platform INI file parser, suitable for embedded systems
 *
 *  These routines are in part based on the article "Multiplatform .INI Files"
 *  by Joseph J. Graf in the March 1994 issue of Dr. Dobb's Journal.
 *
 *  Copyright (c) CompuPhase, 2008-2021
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
 *  use this file except in compliance with the License. You may obtain a copy
 *  of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 *  License for the specific language governing permissions and limitations
 *  under the License.
 *
 *  Version: $Id: minIni.c 53 2015-01-18 13:35:11Z thiadmer.riemersma@gmail.com $
 */

#endif /* _IINI_H_ */