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/* $Id$ */

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#include "stdafx.h"

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#include "string.h"

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#include <stdarg.h>

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#include <ctype.h> // required for tolower()

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void ttd_strlcat(char *dst, const char *src, size_t size)

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{

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	assert(size > 0);

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	for (; size > 0 && *dst != '\0'; --size, ++dst) {}

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	assert(size > 0);

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	while (--size > 0 && *src != '\0') *dst++ = *src++;

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	*dst = '\0';

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}

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void ttd_strlcpy(char *dst, const char *src, size_t size)

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{

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	assert(size > 0);

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	while (--size > 0 && *src != '\0') *dst++ = *src++;

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	*dst = '\0';

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}

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char* strecat(char* dst, const char* src, const char* last)

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{

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	assert(last == NULL || dst <= last);

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	for (; *dst != '\0'; ++dst)

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		if (dst == last) return dst;

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	for (; *src != '\0' && dst != last; ++dst, ++src) *dst = *src;

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	*dst = '\0';

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	return strecpy(dst, src, last);

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}

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char* strecpy(char* dst, const char* src, const char* last)

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{

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	assert(last == NULL || dst <= last);

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	for (; *src != '\0' && dst != last; ++dst, ++src) *dst = *src;

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	*dst = '\0';

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	return dst;

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}

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char* CDECL str_fmt(const char* str, ...)

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{

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	char buf[4096];

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	va_list va;

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	int len;

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	char* p;

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	va_start(va, str);

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	len = vsprintf(buf, str, va);

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	va_end(va);

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	p = malloc(len + 1);

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	if (p != NULL) memcpy(p, buf, len + 1);

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	return p;

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}

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void str_validate(char *str)

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{

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	for (; *str != '\0'; str++)

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		if (!IsValidAsciiChar(*str, CS_ALPHANUMERAL)) *str = '?';

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}

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/**

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 * Only allow certain keys. You can define the filter to be used. This makes

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 *  sure no invalid keys can get into an editbox, like BELL.

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 * @param key character to be checked

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 * @param afilter the filter to use

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 * @return true or false depending if the character is printable/valid or not

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 */

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bool IsValidAsciiChar(byte key, CharSetFilter afilter)

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{

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	bool firsttest = false;

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	switch (afilter) {

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		case CS_ALPHANUMERAL:

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			firsttest = (key >= ' ' && key < 127);

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			break;

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		/* We are very strict here */

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		case CS_NUMERAL:

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			return (key >= '0' && key <= '9');

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		case CS_ALPHA:

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		default:

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			firsttest = ((key >= 'A' && key <= 'Z') || (key >= 'a' && key <= 'z'));

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			break;

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	}

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	/* Allow some special chars too that are non-ASCII but still valid (like '^' above 'a') */

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	return (firsttest || (key >= 160 &&

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		key != 0xAA && key != 0xAC && key != 0xAD && key != 0xAF &&

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		key != 0xB5 && key != 0xB6 && key != 0xB7 && key != 0xB9));

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}

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void strtolower(char *str)

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{

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	for (; *str != '\0'; str++) *str = tolower(*str);

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}