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-rw-r--r--src/string.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/src/string.c b/src/string.c
new file mode 100644
index 000000000..dba2c7131
--- /dev/null
+++ b/src/string.c
@@ -0,0 +1,247 @@
+/* $Id$ */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "functions.h"
+#include "string.h"
+#include "macros.h"
+#include "table/control_codes.h"
+
+#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;
+ char* p;
+
+ va_start(va, str);
+ len = vsnprintf(buf, lengthof(buf), str, va);
+ va_end(va);
+ p = malloc(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 */
+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
+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) str[size - 1] = '\0';
+ return ret;
+}
+#endif /* _MSC_VER */
+
+#endif /* WIN32 */
+
+
+/* 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;
+}
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