453 lines
13 KiB
C++
453 lines
13 KiB
C++
// Read an INI file into easy-to-access name/value pairs.
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// inih and INIReader are released under the New BSD license (see LICENSE.txt).
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// Go to the project home page for more info:
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//
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// https://github.com/benhoyt/inih
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/* inih -- simple .INI file parser
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inih is released under the New BSD license (see LICENSE.txt). Go to the project
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home page for more info:
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https://github.com/benhoyt/inih
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*/
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#ifndef __INI_H__
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#define __INI_H__
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/* Make this header file easier to include in C++ code */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdio.h>
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/* Typedef for prototype of handler function. */
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typedef int (*ini_handler)(void* user, const char* section,
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const char* name, const char* value);
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/* Typedef for prototype of fgets-style reader function. */
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typedef char* (*ini_reader)(char* str, int num, void* stream);
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/* Parse given INI-style file. May have [section]s, name=value pairs
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(whitespace stripped), and comments starting with ';' (semicolon). Section
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is "" if name=value pair parsed before any section heading. name:value
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pairs are also supported as a concession to Python's configparser.
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For each name=value pair parsed, call handler function with given user
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pointer as well as section, name, and value (data only valid for duration
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of handler call). Handler should return nonzero on success, zero on error.
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Returns 0 on success, line number of first error on parse error (doesn't
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stop on first error), -1 on file open error, or -2 on memory allocation
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error (only when INI_USE_STACK is zero).
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*/
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int ini_parse(const char* filename, ini_handler handler, void* user);
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/* Same as ini_parse(), but takes a FILE* instead of filename. This doesn't
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close the file when it's finished -- the caller must do that. */
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int ini_parse_file(FILE* file, ini_handler handler, void* user);
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/* Same as ini_parse(), but takes an ini_reader function pointer instead of
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filename. Used for implementing custom or string-based I/O. */
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int ini_parse_stream(ini_reader reader, void* stream, ini_handler handler,
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void* user);
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/* Nonzero to allow multi-line value parsing, in the style of Python's
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configparser. If allowed, ini_parse() will call the handler with the same
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name for each subsequent line parsed. */
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#ifndef INI_ALLOW_MULTILINE
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#define INI_ALLOW_MULTILINE 1
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#endif
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/* Nonzero to allow a UTF-8 BOM sequence (0xEF 0xBB 0xBF) at the start of
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the file. See http://code.google.com/p/inih/issues/detail?id=21 */
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#ifndef INI_ALLOW_BOM
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#define INI_ALLOW_BOM 1
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#endif
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/* Nonzero to allow inline comments (with valid inline comment characters
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specified by INI_INLINE_COMMENT_PREFIXES). Set to 0 to turn off and match
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Python 3.2+ configparser behaviour. */
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#ifndef INI_ALLOW_INLINE_COMMENTS
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#define INI_ALLOW_INLINE_COMMENTS 1
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#endif
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#ifndef INI_INLINE_COMMENT_PREFIXES
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#define INI_INLINE_COMMENT_PREFIXES ";"
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#endif
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/* Nonzero to use stack, zero to use heap (malloc/free). */
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#ifndef INI_USE_STACK
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#define INI_USE_STACK 1
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#endif
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/* Stop parsing on first error (default is to keep parsing). */
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#ifndef INI_STOP_ON_FIRST_ERROR
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#define INI_STOP_ON_FIRST_ERROR 0
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#endif
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/* Maximum line length for any line in INI file. */
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#ifndef INI_MAX_LINE
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#define INI_MAX_LINE 200
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#endif
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#ifdef __cplusplus
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}
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#endif
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/* inih -- simple .INI file parser
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inih is released under the New BSD license (see LICENSE.txt). Go to the project
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home page for more info:
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https://github.com/benhoyt/inih
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*/
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#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
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#define _CRT_SECURE_NO_WARNINGS
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#endif
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#if !INI_USE_STACK
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#include <stdlib.h>
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#endif
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#define MAX_SECTION 50
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#define MAX_NAME 50
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/* Strip whitespace chars off end of given string, in place. Return s. */
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inline static char* rstrip(char* s)
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{
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char* p = s + strlen(s);
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while (p > s && isspace((unsigned char)(*--p)))
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*p = '\0';
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return s;
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}
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/* Return pointer to first non-whitespace char in given string. */
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inline static char* lskip(const char* s)
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{
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while (*s && isspace((unsigned char)(*s)))
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s++;
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return (char*)s;
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}
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/* Return pointer to first char (of chars) or inline comment in given string,
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or pointer to null at end of string if neither found. Inline comment must
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be prefixed by a whitespace character to register as a comment. */
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inline static char* find_chars_or_comment(const char* s, const char* chars)
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{
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#if INI_ALLOW_INLINE_COMMENTS
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int was_space = 0;
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while (*s && (!chars || !strchr(chars, *s)) &&
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!(was_space && strchr(INI_INLINE_COMMENT_PREFIXES, *s))) {
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was_space = isspace((unsigned char)(*s));
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s++;
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}
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#else
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while (*s && (!chars || !strchr(chars, *s))) {
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s++;
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}
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#endif
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return (char*)s;
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}
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/* Version of strncpy that ensures dest (size bytes) is null-terminated. */
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inline static char* strncpy0(char* dest, const char* src, size_t size)
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{
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#if __GNUC__ >= 8
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wstringop-truncation"
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strncpy(dest, src, size);
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#pragma GCC diagnostic pop
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#else
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strncpy(dest, src, size);
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#endif
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dest[size - 1] = '\0';
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return dest;
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}
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/* See documentation in header file. */
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inline int ini_parse_stream(ini_reader reader, void* stream, ini_handler handler,
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void* user)
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{
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/* Uses a fair bit of stack (use heap instead if you need to) */
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#if INI_USE_STACK
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char line[INI_MAX_LINE];
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#else
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char* line;
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#endif
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char section[MAX_SECTION] = "";
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char prev_name[MAX_NAME] = "";
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char* start;
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char* end;
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char* name;
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char* value;
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int lineno = 0;
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int error = 0;
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#if !INI_USE_STACK
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line = (char*)malloc(INI_MAX_LINE);
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if (!line) {
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return -2;
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}
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#endif
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/* Scan through stream line by line */
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while (reader(line, INI_MAX_LINE, stream) != NULL) {
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lineno++;
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start = line;
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#if INI_ALLOW_BOM
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if (lineno == 1 && (unsigned char)start[0] == 0xEF &&
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(unsigned char)start[1] == 0xBB &&
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(unsigned char)start[2] == 0xBF) {
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start += 3;
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}
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#endif
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start = lskip(rstrip(start));
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if (*start == ';' || *start == '#') {
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/* Per Python configparser, allow both ; and # comments at the
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start of a line */
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}
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#if INI_ALLOW_MULTILINE
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else if (*prev_name && *start && start > line) {
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#if INI_ALLOW_INLINE_COMMENTS
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end = find_chars_or_comment(start, NULL);
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if (*end)
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*end = '\0';
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rstrip(start);
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#endif
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/* Non-blank line with leading whitespace, treat as continuation
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of previous name's value (as per Python configparser). */
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if (!handler(user, section, prev_name, start) && !error)
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error = lineno;
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}
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#endif
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else if (*start == '[') {
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/* A "[section]" line */
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end = find_chars_or_comment(start + 1, "]");
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if (*end == ']') {
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*end = '\0';
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strncpy0(section, start + 1, sizeof(section));
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*prev_name = '\0';
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}
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else if (!error) {
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/* No ']' found on section line */
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error = lineno;
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}
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}
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else if (*start) {
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/* Not a comment, must be a name[=:]value pair */
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end = find_chars_or_comment(start, "=:");
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if (*end == '=' || *end == ':') {
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*end = '\0';
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name = rstrip(start);
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value = lskip(end + 1);
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#if INI_ALLOW_INLINE_COMMENTS
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end = find_chars_or_comment(value, NULL);
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if (*end)
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*end = '\0';
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#endif
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rstrip(value);
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/* Valid name[=:]value pair found, call handler */
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strncpy0(prev_name, name, sizeof(prev_name));
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if (!handler(user, section, name, value) && !error)
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error = lineno;
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}
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else if (!error) {
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/* No '=' or ':' found on name[=:]value line */
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error = lineno;
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}
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}
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#if INI_STOP_ON_FIRST_ERROR
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if (error)
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break;
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#endif
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}
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#if !INI_USE_STACK
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free(line);
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#endif
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return error;
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}
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/* See documentation in header file. */
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inline int ini_parse_file(FILE* file, ini_handler handler, void* user)
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{
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return ini_parse_stream((ini_reader)fgets, file, handler, user);
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}
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/* See documentation in header file. */
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inline int ini_parse(const char* filename, ini_handler handler, void* user)
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{
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FILE* file;
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int error;
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file = fopen(filename, "r");
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if (!file)
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return -1;
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error = ini_parse_file(file, handler, user);
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fclose(file);
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return error;
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}
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#endif /* __INI_H__ */
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#ifndef __INIREADER_H__
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#define __INIREADER_H__
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#include <map>
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#include <set>
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#include <string>
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// Read an INI file into easy-to-access name/value pairs. (Note that I've gone
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// for simplicity here rather than speed, but it should be pretty decent.)
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class INIReader
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{
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public:
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// Empty Constructor
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INIReader() {};
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// Construct INIReader and parse given filename. See ini.h for more info
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// about the parsing.
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INIReader(std::string filename);
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// Return the result of ini_parse(), i.e., 0 on success, line number of
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// first error on parse error, or -1 on file open error.
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int ParseError() const;
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// Return the list of sections found in ini file
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std::set<std::string> Sections();
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// Get a string value from INI file, returning default_value if not found.
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std::string Get(std::string section, std::string name,
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std::string default_value);
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// Get an integer (long) value from INI file, returning default_value if
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// not found or not a valid integer (decimal "1234", "-1234", or hex "0x4d2").
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long GetInteger(std::string section, std::string name, long default_value);
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// Get a real (floating point double) value from INI file, returning
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// default_value if not found or not a valid floating point value
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// according to strtod().
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double GetReal(std::string section, std::string name, double default_value);
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// Get a boolean value from INI file, returning default_value if not found or if
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// not a valid true/false value. Valid true values are "true", "yes", "on", "1",
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// and valid false values are "false", "no", "off", "0" (not case sensitive).
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bool GetBoolean(std::string section, std::string name, bool default_value);
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private:
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int _error;
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std::map<std::string, std::string> _values;
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std::set<std::string> _sections;
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static std::string MakeKey(std::string section, std::string name);
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static int ValueHandler(void* user, const char* section, const char* name,
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const char* value);
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};
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#endif // __INIREADER_H__
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#ifndef __INIREADER__
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#define __INIREADER__
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#include <algorithm>
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#include <cctype>
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#include <cstdlib>
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using std::string;
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inline INIReader::INIReader(string filename)
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{
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_error = ini_parse(filename.c_str(), ValueHandler, this);
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}
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inline int INIReader::ParseError() const
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{
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return _error;
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}
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inline std::set<string> INIReader::Sections()
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{
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return _sections;
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}
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inline string INIReader::Get(string section, string name, string default_value)
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{
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string key = MakeKey(section, name);
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return _values.count(key) ? _values[key] : default_value;
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}
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inline long INIReader::GetInteger(string section, string name, long default_value)
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{
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string valstr = Get(section, name, "");
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const char* value = valstr.c_str();
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char* end;
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// This parses "1234" (decimal) and also "0x4D2" (hex)
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long n = strtol(value, &end, 0);
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return end > value ? n : default_value;
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}
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inline double INIReader::GetReal(string section, string name, double default_value)
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{
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string valstr = Get(section, name, "");
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const char* value = valstr.c_str();
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char* end;
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double n = strtod(value, &end);
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return end > value ? n : default_value;
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}
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inline char to_lower(char chr)
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{
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return char(tolower((unsigned char)chr));
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}
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inline bool INIReader::GetBoolean(string section, string name, bool default_value)
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{
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string valstr = Get(section, name, "");
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// Convert to lower case to make string comparisons case-insensitive
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std::transform(valstr.begin(), valstr.end(), valstr.begin(), to_lower);
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if (valstr == "true" || valstr == "yes" || valstr == "on" || valstr == "1")
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return true;
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else if (valstr == "false" || valstr == "no" || valstr == "off" || valstr == "0")
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return false;
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else
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return default_value;
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}
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inline string INIReader::MakeKey(string section, string name)
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{
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string key = section + "=" + name;
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// Convert to lower case to make section/name lookups case-insensitive
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std::transform(key.begin(), key.end(), key.begin(), to_lower);
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return key;
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}
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inline int INIReader::ValueHandler(void* user, const char* section, const char* name,
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const char* value)
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{
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INIReader* reader = (INIReader*)user;
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string key = MakeKey(section, name);
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if (reader->_values[key].size() > 0)
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reader->_values[key] += "\n";
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reader->_values[key] += value;
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reader->_sections.insert(section);
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return 1;
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}
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#endif // __INIREADER__
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