gb/gb_ini.h

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// gb_ini.h - v0.91 - public domain ini file loader library - no warranty implied; use at your own risk
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// A Simple Ini File Loader Library for C and C++
//
// Version History:
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// 0.91 - Add extern "C" if compiling as C++
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// 0.90 - Initial Version
//
// LICENSE
//
// This software is in the public domain. Where that dedication is not
// recognized, you are granted a perpetual, irrevocable license to copy,
// distribute, and modify this file as you see fit.
//
// How to use:
//
// Do this:
// #define GB_INI_IMPLEMENTATION
// before you include this file in *one* C++ file to create the implementation
//
// i.e. it should look like this:
// #include ...
// #include ...
// #include ...
// #define GB_INI_IMPLEMENTATION
// #include "gb_ini.h"
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//
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// If you prefer to use C++, you can use all the same functions in a
// namespace instead, do this:
// #define GB_INI_CPP
// before you include the header file
//
// i.e it should look like this:
// #define GB_INI_CPP
// #include "gb_ini.h"
//
// Examples:
//
// test.ini contents
#if 0
; This is a Comment
# This is also
name=gb_ini.h
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version = 01337 # Look mum, a comment!
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[license]
name = Public Domain
[author]
name = Ginger Bill
#endif
// C example
#if 0
#define GB_INI_IMPLEMENTATION
#include "gb_ini.h"
#include <stdio.h>
#include <stdlib.h>
struct Library
{
const char* name;
int version;
const char* license;
const char* author;
};
// The below macro expands to this:
// static test_ini_handler(void* data, const char* section, const char* name, const char* value)
static GB_INI_HANDLER(test_ini_handler)
{
struct Library* lib = (struct Library*)data;
#define TEST(s, n) (strcmp(section, s) == 0 && strcmp(name, n) == 0)
if (TEST("", "name"))
lib->name = strdup(value);
else if (TEST("", "version"))
lib->version = atoi(value);
else if (TEST("license", "name"))
lib->license = strdup(value);
else if (TEST("author", "name"))
lib->author = strdup(value);
else
return 0;
#undef TEST
return 1;
}
int main(int argc, char** argv)
{
struct Library lib = {0};
struct gb_Ini_Error err = gb_ini_parse("test.ini", &test_ini_handler, &lib);
if (err.type != GB_INI_ERROR_NONE)
{
if (err.line_num > 0)
printf("Line (%d): ", err.line_num);
printf("%s\n", gb_ini_error_string(err));
return 1;
}
printf("Name : %s\n", lib.name); // Name : gb_init.h
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printf("Version : %d\n", lib.version); // Version : 1337
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printf("License : %s\n", lib.license); // License : Public Domain
printf("Author : %s\n", lib.author); // Author : Ginger Bill
return 0;
}
#endif
//
// C++ example
#if 0
#define GB_INI_CPP
#define GB_INI_IMPLEMENTATION
#include "gb_ini.h"
#include <stdio.h>
#include <stdlib.h>
struct Library
{
const char* name;
int version;
const char* license;
const char* author;
};
// The below macro expands to this:
// static test_ini_handler(void* data, const char* section, const char* name, const char* value)
static GB_INI_HANDLER(test_ini_handler)
{
Library* lib = (Library*)data;
#define TEST(s, n) (strcmp(section, s) == 0 && strcmp(name, n) == 0)
if (TEST("", "name"))
lib->name = strdup(value);
else if (TEST("", "version"))
lib->version = atoi(value);
else if (TEST("license", "name"))
lib->license = strdup(value);
else if (TEST("author", "name"))
lib->author = strdup(value);
else
return 0;
#undef TEST
return 1;
}
int main(int argc, char** argv)
{
Library lib = {};
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using namespace gb;
Ini_Error err = ini_parse("test.ini", &test_ini_handler, &lib);
if (err.type != INI_ERROR_NONE)
{
if (err.line_num > 0)
printf("Line (%d): ", err.line_num);
printf("%s\n", ini_error_string(err));
return 1;
}
printf("Name : %s\n", lib.name); // Name : gb_init.h
printf("Version : %d\n", lib.version); // Version : 90
printf("License : %s\n", lib.license); // License : Public Domain
printf("Author : %s\n", lib.author); // Author : Ginger Bill
return 0;
}
#endif
#ifndef GB_INI_INCLUDE_GB_INI_H
#define GB_INI_INCLUDE_GB_INI_H
#ifndef GB_INI_MAX_LINE_LENGTH
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#define GB_INI_MAX_LINE_LENGTH 1024
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#endif
#ifndef GB_INI_MAX_SECTION_LENGTH
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#define GB_INI_MAX_SECTION_LENGTH 256
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#endif
#ifndef GB_INI_MAX_NAME_LENGTH
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#define GB_INI_MAX_NAME_LENGTH 256
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#endif
#ifndef GB_INI_CHECK_FOR_UTF8_BOM
#define GB_INI_CHECK_FOR_UTF8_BOM 1
#endif
#ifndef _MSC_VER
#ifdef __cplusplus
#define gb_inline inline
#else
#define gb_inline
#endif
#else
#define gb_inline __forceinline
#endif
#include <stdio.h>
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#ifdef __cplusplus
extern "C" {
#endif
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enum
{
GB_INI_ERROR_NONE = 0,
GB_INI_ERROR_FILE_ERROR,
GB_INI_ERROR_MISSING_SECTION_BRACKET,
GB_INI_ERROR_ASSIGNMENT_MISSING,
GB_INI_ERROR_HANDLER_ERROR,
GB_INI_ERROR_COUNT,
};
struct gb_Ini_Error
{
int type;
size_t line_num;
};
#ifndef GB_INI_HANDLER_RETURN_TYPE
#define GB_INI_HANDLER_RETURN_TYPE
typedef int gb_Ini_HRT;
#endif
// This macro can be use to declare this type of function without
// needing to define all the of the parameters
#define GB_INI_HANDLER(func_name) gb_Ini_HRT func_name(void* data, const char* section, const char* name, const char* value)
typedef GB_INI_HANDLER(gb_Ini_Handler);
extern const char* GB_ERROR_STRINGS[GB_INI_ERROR_COUNT];
struct gb_Ini_Error gb_ini_parse(const char* filename, gb_Ini_Handler* handler_func, void* data);
struct gb_Ini_Error gb_ini_parse_file(FILE* file, gb_Ini_Handler* handler_func, void* data);
gb_inline const char*
gb_ini_error_string(const struct gb_Ini_Error err)
{
return GB_ERROR_STRINGS[err.type];
}
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#ifdef __cplusplus
}
#endif
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#ifdef GB_INI_CPP
#if !defined(__cplusplus)
#error You need to compile as C++ for the C++ version of gb_ini.h to work
#endif
namespace gb
{
typedef gb_Ini_Error Ini_Error;
typedef gb_Ini_Handler Ini_Handler;
// Just a copy but with the GB_ prefix stripped
enum
{
INI_ERROR_NONE = 0,
INI_ERROR_FILE_ERROR,
INI_ERROR_MISSING_SECTION_BRACKET,
INI_ERROR_ASSIGNMENT_MISSING,
INI_ERROR_HANDLER_ERROR,
// No need for enum count
};
Ini_Error
ini_parse(const char* filename, Ini_Handler* handler_func, void* data)
{
return gb_ini_parse(filename, handler_func, data);
}
Ini_Error
ini_parse(FILE* file, Ini_Handler* handler_func, void* data)
{
return gb_ini_parse_file(file, handler_func, data);
}
const char*
ini_error_string(const Ini_Error err)
{
return GB_ERROR_STRINGS[err.type];
}
} // namespace gb
#endif // GB_INI_CPP
#endif // GB_INI_INCLUDE_GB_INI_H
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#ifdef GB_INI_IMPLEMENTATION
#include <ctype.h>
#include <string.h>
const char* GB_ERROR_STRINGS[GB_INI_ERROR_COUNT] = {
"",
"Error in opening file",
"Missing closing section bracket ']'",
"Missing assignment operator '='",
"Error in handler function",
};
static gb_inline char*
gb__left_whitespace_skip(const char* str)
{
while (*str && isspace((unsigned char)(*str)))
str++;
return (char*)str;
}
static gb_inline char*
gb__right_whitespace_strip(char* str)
{
char* end = str + strlen(str);
while (end > str && isspace((unsigned char)(*--end)))
*end = '\0';
return str;
}
static gb_inline char*
gb__find_char_or_comment_in_string(const char* str, char c)
{
int was_whitespace = 0;
while (*str && *str != c &&
!(was_whitespace && *str == ';'))
{
was_whitespace = isspace((unsigned char)(*str));
str++;
}
return (char*)str;
}
static gb_inline char*
gb__string_copy(char* dst, const char* src, size_t size)
{
strncpy(dst, src, size);
dst[size - 1] = '\0';
return dst;
}
struct gb_Ini_Error
gb_ini_parse(const char* filename, gb_Ini_Handler* handler_func, void* data)
{
struct gb_Ini_Error err = {GB_INI_ERROR_NONE, 0};
FILE* file = fopen(filename, "r");
if (!file)
return err;
err = gb_ini_parse_file(file, handler_func, data);
fclose(file);
return err;
}
struct gb_Ini_Error
gb_ini_parse_file(FILE* file, gb_Ini_Handler* handler_func, void* data)
{
char line[GB_INI_MAX_LINE_LENGTH] = "";
size_t line_num = 0;
char section[GB_INI_MAX_SECTION_LENGTH] = "";
char prev_name[GB_INI_MAX_NAME_LENGTH] = "";
char* start;
char* end;
struct gb_Ini_Error err = {GB_INI_ERROR_NONE, 0};
while (fgets(line, GB_INI_MAX_LINE_LENGTH, file) != 0)
{
line_num++;
start = line;
#if GB_INI_CHECK_FOR_UTF8_BOM
// Check for UTF-8 Byte Order Mark
if (line_num == 1 &&
(unsigned char)start[0] == 0xef &&
(unsigned char)start[1] == 0xbb &&
(unsigned char)start[2] == 0xbf)
{
start += 3;
}
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#endif
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start = gb__left_whitespace_skip(gb__right_whitespace_strip(start));
if (start[0] == ';' || start[0] == '#')
continue; // Allow '#' and ';' comments at start of line
if (start[0] == '[') // [section]
{
end = gb__find_char_or_comment_in_string(start+1, ']');
if (*end == ']')
{
*end = '\0';
char* sect = start + 1;
sect = gb__left_whitespace_skip(gb__right_whitespace_strip(sect));
gb__string_copy(section, sect, sizeof(section));
*prev_name = '\0';
}
else if (!err.type)
{
err.type = GB_INI_ERROR_MISSING_SECTION_BRACKET;
err.line_num = line_num;
}
}
else if (start[0] && start[0] != ';')
{
end = gb__find_char_or_comment_in_string(start, '=');
if (*end == '=')
{
*end = '\0';
char* name = gb__right_whitespace_strip(start);
char* value = gb__left_whitespace_skip(end + 1);
end = gb__find_char_or_comment_in_string(value, '\0');
if (*end == ';')
*end = '\0';
gb__right_whitespace_strip(value);
gb__string_copy(prev_name, name, sizeof(prev_name));
if (!handler_func(data, section, name, value) && err.type)
{
err.type = GB_INI_ERROR_HANDLER_ERROR;
err.line_num = line_num;
}
}
else if (!err.type)
{
// No '=' found on name=value line
err.type = GB_INI_ERROR_ASSIGNMENT_MISSING;
err.line_num = line_num;
continue;
}
}
if (err.type)
break;
}
return err;
}
#endif // GB_INI_IMPLEMENTATION