ObjFW  Diff

 * Q Public License 1.0, which can be found in the file LICENSE included in
 * the packaging of this file.
 */

#import "config.h"

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>

#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#else
#define madvise(addr, len, advise)
#endif

#import "OFMutableString.h"
#import "OFExceptions.h"
#import "OFMacros.h"

#ifndef HAVE_ASPRINTF
#import "asprintf.h"
#endif

static OF_INLINE int
check_utf8(const char *str, size_t len)
{
	size_t i;
	BOOL utf8;

	utf8 = NO;

	madvise((void*)str, len, MADV_SEQUENTIAL);

	for (i = 0; i < len; i++) {
		/* No sign of UTF-8 here */
		if (OF_LIKELY(!(str[i] & 0x80)))
			continue;

		utf8 = YES;

		/* We're missing a start byte here */
		if (OF_UNLIKELY(!(str[i] & 0x40))) {
			madvise((void*)str, len, MADV_NORMAL);
			return -1;
		}

		/* We have at minimum a 2 byte character -> check next byte */
		if (OF_UNLIKELY(len < i + 1 || (str[i + 1] & 0xC0) != 0x80)) {
			madvise((void*)str, len, MADV_NORMAL);
			return -1;
		}

		/* Check if we have at minimum a 3 byte character */
		if (OF_LIKELY(!(str[i] & 0x20))) {
			i++;
			continue;
		}

		/* We have at minimum a 3 byte char -> check second next byte */
		if (OF_UNLIKELY(len < i + 2 || (str[i + 2] & 0xC0) != 0x80)) {
			madvise((void*)str, len, MADV_NORMAL);
			return -1;
		}

		/* Check if we have a 4 byte character */
		if (OF_LIKELY(!(str[i] & 0x10))) {
			i += 2;
			continue;
		}

		/* We have a 4 byte character -> check third next byte */
		if (OF_UNLIKELY(len < i + 3 || (str[i + 3] & 0xC0) != 0x80)) {
			madvise((void*)str, len, MADV_NORMAL);
			return -1;
		}

		/*
		 * Just in case, check if there's a 5th character, which is
		 * forbidden by UTF-8
		 */
		if (OF_UNLIKELY(str[i] & 0x08)) {
			madvise((void*)str, len, MADV_NORMAL);
			return -1;
		}

		i += 3;
	}

	madvise((void*)str, len, MADV_NORMAL);

	return (utf8 ? 1 : 0);
}

@implementation OFMutableString
- initWithCString: (const char*)str
{
	Class c;

	self = [super init];

	if (str != NULL) {
		length = strlen(str);

		switch (check_utf8(str, length)) {
			case 1:
				is_utf8 = YES;
				break;
			case -1:
				c = isa;
				[super dealloc];
				@throw [OFInvalidEncodingException
					newWithClass: c];
		}

		@try {
			string = [self allocWithSize: length + 1];
		} @catch (OFException *e) {
			/*
			 * We can't use [super dealloc] on OS X here.
			 * Compiler bug? Anyway, [self dealloc] will do here as
			 * we don't reimplement dealloc.
			 */
			[self dealloc];
			@throw e;
		}
		memcpy(string, str, length + 1);
	}

	return self;
}

- initWithFormat: (OFString*)fmt, ...
{
	id ret;
	va_list args;

	va_start(args, fmt);
	ret = [self initWithFormat: fmt
		      andArguments: args];
	va_end(args);

	return ret;
}

- initWithFormat: (OFString*)fmt
    andArguments: (va_list)args
{
	int t;
	Class c;

	self = [super init];

	if (fmt == NULL) {
		c = isa;
		[super dealloc];
		@throw [OFInvalidFormatException newWithClass: c];
	}

	if ((t = vasprintf(&string, [fmt cString], args)) == -1) {
		c = isa;
		[super dealloc];
		@throw [OFInitializationFailedException newWithClass: c];
	}
	length = t;

	switch (check_utf8(string, length)) {
		case 1:
			is_utf8 = YES;
			break;
		case -1:
			free(string);
			c = isa;
			[super dealloc];
			@throw [OFInvalidEncodingException newWithClass: c];
	}

	@try {
		[self addToMemoryPool: string];
	} @catch (OFException *e) {
		free(string);
		@throw e;
	}

	return self;
}

- setTo: (const char*)str
{
	size_t len;

	if (string != NULL)
		[self freeMem: string];

	len = strlen(str);

	switch (check_utf8(str, len)) {
	case 1:
		is_utf8 = YES;
		break;
	case -1:
		string = NULL;
		length = 0;
		is_utf8 = NO;

- appendCString: (const char*)str
{
	size_t strlength;

	strlength = strlen(str);

	switch (check_utf8(str, strlength)) {
	case 1:
		is_utf8 = YES;
		break;
	case -1:
		@throw [OFInvalidEncodingException newWithClass: isa];
	}