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@ r6740:5e869f977bb3
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Location: cpp/openttd-patchpack/source/src/string.cpp
r6740:5e869f977bb3
7.7 KiB
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(svn r9973) -Cleanup: removed some code that kept both ends of a dualheaded engine in the same train (when moving wagons in a depot)
NormaliseTrainConsist() is called later in the same command and it will take care of this issue
NormaliseTrainConsist() is called later in the same command and it will take care of this issue
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/** @file string.cpp */
#include "stdafx.h"
#include "openttd.h"
#include "functions.h"
#include "string.h"
#include "macros.h"
#include "table/control_codes.h"
#include "helpers.hpp"
#include <stdarg.h>
#include <ctype.h> // required for tolower()
void ttd_strlcat(char *dst, const char *src, size_t size)
{
assert(size > 0);
for (; size > 0 && *dst != '\0'; --size, ++dst) {}
assert(size > 0);
while (--size > 0 && *src != '\0') *dst++ = *src++;
*dst = '\0';
}
void ttd_strlcpy(char *dst, const char *src, size_t size)
{
assert(size > 0);
while (--size > 0 && *src != '\0') *dst++ = *src++;
*dst = '\0';
}
char* strecat(char* dst, const char* src, const char* last)
{
assert(dst <= last);
for (; *dst != '\0'; ++dst)
if (dst == last) return dst;
for (; *src != '\0' && dst != last; ++dst, ++src) *dst = *src;
*dst = '\0';
return strecpy(dst, src, last);
}
char* strecpy(char* dst, const char* src, const char* last)
{
assert(dst <= last);
for (; *src != '\0' && dst != last; ++dst, ++src) *dst = *src;
*dst = '\0';
#if 1
if (dst == last && *src != '\0') {
error("String too long for destination buffer");
}
#endif
return dst;
}
char* CDECL str_fmt(const char* str, ...)
{
char buf[4096];
va_list va;
int len;
va_start(va, str);
len = vsnprintf(buf, lengthof(buf), str, va);
va_end(va);
char* p = MallocT<char>(len + 1);
if (p != NULL) memcpy(p, buf, len + 1);
return p;
}
void str_validate(char *str)
{
char *dst = str;
WChar c;
size_t len;
for (len = Utf8Decode(&c, str); c != '\0'; len = Utf8Decode(&c, str)) {
if (IsPrintable(c) && (c < SCC_SPRITE_START || c > SCC_SPRITE_END ||
IsValidChar(c - SCC_SPRITE_START, CS_ALPHANUMERAL))) {
/* Copy the character back. Even if dst is current the same as str
* (i.e. no characters have been changed) this is quicker than
* moving the pointers ahead by len */
do {
*dst++ = *str++;
} while (--len != 0);
} else {
/* Replace the undesirable character with a question mark */
str += len;
*dst++ = '?';
}
}
*dst = '\0';
}
void str_strip_colours(char *str)
{
char *dst = str;
WChar c;
size_t len;
for (len = Utf8Decode(&c, str); c != '\0'; len = Utf8Decode(&c, str)) {
if (c < SCC_BLUE || c > SCC_BLACK) {
/* Copy the character back. Even if dst is current the same as str
* (i.e. no characters have been changed) this is quicker than
* moving the pointers ahead by len */
do {
*dst++ = *str++;
} while (--len != 0);
} else {
/* Just skip (strip) the colour codes */
str += len;
}
}
*dst = '\0';
}
/** Convert a given ASCII string to lowercase.
* NOTE: only support ASCII characters, no UTF8 fancy. As currently
* the function is only used to lowercase data-filenames if they are
* not found, this is sufficient. If more, or general functionality is
* needed, look to r7271 where it was removed because it was broken when
* using certain locales: eg in Turkish the uppercase 'I' was converted to
* '?', so just revert to the old functionality
* @param str string to convert */
void strtolower(char *str)
{
for (; *str != '\0'; str++) *str = tolower(*str);
}
/**
* Only allow certain keys. You can define the filter to be used. This makes
* sure no invalid keys can get into an editbox, like BELL.
* @param key character to be checked
* @param afilter the filter to use
* @return true or false depending if the character is printable/valid or not
*/
bool IsValidChar(WChar key, CharSetFilter afilter)
{
switch (afilter) {
case CS_ALPHANUMERAL: return IsPrintable(key);
case CS_NUMERAL: return (key >= '0' && key <= '9');
case CS_ALPHA: return IsPrintable(key) && !(key >= '0' && key <= '9');
}
return false;
}
#ifdef WIN32
int CDECL snprintf(char *str, size_t size, const char *format, ...)
{
va_list ap;
int ret;
va_start(ap, format);
ret = vsnprintf(str, size, format, ap);
va_end(ap);
return ret;
}
#ifdef _MSC_VER
/* *nprintf broken, not POSIX compliant, MSDN description
* - If len < count, then len characters are stored in buffer, a null-terminator is appended, and len is returned.
* - If len = count, then len characters are stored in buffer, no null-terminator is appended, and len is returned.
* - If len > count, then count characters are stored in buffer, no null-terminator is appended, and a negative value is returned
*/
int CDECL vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
int ret;
ret = _vsnprintf(str, size, format, ap);
if (ret < 0 || ret == size) str[size - 1] = '\0';
return ret;
}
#endif /* _MSC_VER */
#endif /* WIN32 */
/** Convert the md5sum to a hexadecimal string representation
* @param buf buffer to put the md5sum into
* @param last last character of buffer (usually lastof(buf))
* @param md5sum the md5sum itself
* @return a pointer to the next character after the md5sum */
char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16])
{
char *p = buf;
for (uint i = 0; i < 16; i++) {
p += snprintf(p, last + 1 - p, "%02X", md5sum[i]);
if (p >= last) break;
}
return p;
}
/* UTF-8 handling routines */
/* Decode and consume the next UTF-8 encoded character
* @param c Buffer to place decoded character.
* @param s Character stream to retrieve character from.
* @return Number of characters in the sequence.
*/
size_t Utf8Decode(WChar *c, const char *s)
{
assert(c != NULL);
if (!HASBIT(s[0], 7)) {
/* Single byte character: 0xxxxxxx */
*c = s[0];
return 1;
} else if (GB(s[0], 5, 3) == 6) {
if (IsUtf8Part(s[1])) {
/* Double byte character: 110xxxxx 10xxxxxx */
*c = GB(s[0], 0, 5) << 6 | GB(s[1], 0, 6);
if (*c >= 0x80) return 2;
}
} else if (GB(s[0], 4, 4) == 14) {
if (IsUtf8Part(s[1]) && IsUtf8Part(s[2])) {
/* Triple byte character: 1110xxxx 10xxxxxx 10xxxxxx */
*c = GB(s[0], 0, 4) << 12 | GB(s[1], 0, 6) << 6 | GB(s[2], 0, 6);
if (*c >= 0x800) return 3;
}
} else if (GB(s[0], 3, 5) == 30) {
if (IsUtf8Part(s[1]) && IsUtf8Part(s[2]) && IsUtf8Part(s[3])) {
/* 4 byte character: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
*c = GB(s[0], 0, 3) << 18 | GB(s[1], 0, 6) << 12 | GB(s[2], 0, 6) << 6 | GB(s[3], 0, 6);
if (*c >= 0x10000 && *c <= 0x10FFFF) return 4;
}
}
//DEBUG(misc, 1, "[utf8] invalid UTF-8 sequence");
*c = '?';
return 1;
}
/* Encode a unicode character and place it in the buffer
* @param buf Buffer to place character.
* @param c Unicode character to encode.
* @return Number of characters in the encoded sequence.
*/
size_t Utf8Encode(char *buf, WChar c)
{
if (c < 0x80) {
*buf = c;
return 1;
} else if (c < 0x800) {
*buf++ = 0xC0 + GB(c, 6, 5);
*buf = 0x80 + GB(c, 0, 6);
return 2;
} else if (c < 0x10000) {
*buf++ = 0xE0 + GB(c, 12, 4);
*buf++ = 0x80 + GB(c, 6, 6);
*buf = 0x80 + GB(c, 0, 6);
return 3;
} else if (c < 0x110000) {
*buf++ = 0xF0 + GB(c, 18, 3);
*buf++ = 0x80 + GB(c, 12, 6);
*buf++ = 0x80 + GB(c, 6, 6);
*buf = 0x80 + GB(c, 0, 6);
return 4;
}
//DEBUG(misc, 1, "[utf8] can't UTF-8 encode value 0x%X", c);
*buf = '?';
return 1;
}
/**
* Properly terminate an UTF8 string to some maximum length
* @param s string to check if it needs additional trimming
* @param maxlen the maximum length the buffer can have.
* @return the new length in bytes of the string (eg. strlen(new_string))
* @NOTE maxlen is the string length _INCLUDING_ the terminating '\0'
*/
size_t Utf8TrimString(char *s, size_t maxlen)
{
size_t length = 0;
for (const char *ptr = strchr(s, '\0'); *s != '\0';) {
size_t len = Utf8EncodedCharLen(*s);
/* Silently ignore invalid UTF8 sequences, our only concern trimming */
if (len == 0) len = 1;
/* Take care when a hard cutoff was made for the string and
* the last UTF8 sequence is invalid */
if (length + len >= maxlen || (s + len > ptr)) break;
s += len;
length += len;
}
*s = '\0';
return length;
}
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