# string.cpp

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    00001 /* $Id: string.cpp 15718 2009-03-15 00:32:18Z rubidium $ */
    00002
    00005 #include "stdafx.h"
    00006 #include "debug.h"
    00007 #include "core/alloc_func.hpp"
    00008 #include "core/math_func.hpp"
    00009 #include "string_func.h"
    00010
    00011 #include "table/control_codes.h"
    00012
    00013 #include <stdarg.h>
    00014 #include <ctype.h> /* required for tolower() */
    00015
    00026 static int CDECL vseprintf(char *str, const char *last, const char *format, va_list ap)
    00027 {
    00028   if (str >= last) return 0;
    00029   size_t size = last - str;
    00030   return min((int)size, vsnprintf(str, size, format, ap));
    00031 }
    00032
    00033 void ttd_strlcat(char *dst, const char *src, size_t size)
    00034 {
    00035   assert(size > 0);
    00036   while (size > 0 && *dst != '\0') {
    00037     size--;
    00038     dst++;
    00039   }
    00040
    00041   ttd_strlcpy(dst, src, size);
    00042 }
    00043
    00044
    00045 void ttd_strlcpy(char *dst, const char *src, size_t size)
    00046 {
    00047   assert(size > 0);
    00048   while (--size > 0 && *src != '\0') {
    00049     *dst++ = *src++;
    00050   }
    00051   *dst = '\0';
    00052 }
    00053
    00054
    00055 char *strecat(char *dst, const char *src, const char *last)
    00056 {
    00057   assert(dst <= last);
    00058   while (*dst != '\0') {
    00059     if (dst == last) return dst;
    00060     dst++;
    00061   }
    00062
    00063   return strecpy(dst, src, last);
    00064 }
    00065
    00066
    00067 char *strecpy(char *dst, const char *src, const char *last)
    00068 {
    00069   assert(dst <= last);
    00070   while (dst != last && *src != '\0') {
    00071     *dst++ = *src++;
    00072   }
    00073   *dst = '\0';
    00074
    00075   if (dst == last && *src != '\0') {
    00076 #ifdef STRGEN
    00077     error("String too long for destination buffer");
    00078 #else /* STRGEN */
    00079     DEBUG(misc, 0, "String too long for destination buffer");
    00080 #endif /* STRGEN */
    00081   }
    00082   return dst;
    00083 }
    00084
    00085
    00086 char *CDECL str_fmt(const char *str, ...)
    00087 {
    00088   char buf[4096];
    00089   va_list va;
    00090
    00091   va_start(va, str);
    00092   int len = vseprintf(buf, lastof(buf), str, va);
    00093   va_end(va);
    00094   char *p = MallocT<char>(len + 1);
    00095   memcpy(p, buf, len + 1);
    00096   return p;
    00097 }
    00098
    00099
    00100 void str_validate(char *str, const char *last, bool allow_newlines, bool ignore)
    00101 {
    00102   /* Assume the ABSOLUTE WORST to be in str as it comes from the outside. */
    00103
    00104   char *dst = str;
    00105   while (*str != '\0') {
    00106     size_t len = Utf8EncodedCharLen(*str);
    00107     /* If the character is unknown, i.e. encoded length is 0
    00108      * we assume worst case for the length check.
    00109      * The length check is needed to prevent Utf8Decode to read
    00110      * over the terminating '\0' if that happens to be placed
    00111      * within the encoding of an UTF8 character. */
    00112     if ((len == 0 && str + 4 > last) || str + len > last) break;
    00113
    00114     WChar c;
    00115     len = Utf8Decode(&c, str);
    00116     /* It's possible to encode the string termination character
    00117      * into a multiple bytes. This prevents those termination
    00118      * characters to be skipped */
    00119     if (c == '\0') break;
    00120
    00121     if (IsPrintable(c) && (c < SCC_SPRITE_START || c > SCC_SPRITE_END)) {
    00122       /* Copy the character back. Even if dst is current the same as str
    00123        * (i.e. no characters have been changed) this is quicker than
    00124        * moving the pointers ahead by len */
    00125       do {
    00126         *dst++ = *str++;
    00127       } while (--len != 0);
    00128     } else if (allow_newlines && c == '\n') {
    00129       *dst++ = *str++;
    00130     } else {
    00131       if (allow_newlines && c == '\r' && str[1] == '\n') {
    00132         str += len;
    00133         continue;
    00134       }
    00135       /* Replace the undesirable character with a question mark */
    00136       str += len;
    00137       if (!ignore) *dst++ = '?';
    00138     }
    00139   }
    00140
    00141   *dst = '\0';
    00142 }
    00143
    00144
    00145 void str_strip_colours(char *str)
    00146 {
    00147   char *dst = str;
    00148   WChar c;
    00149   size_t len;
    00150
    00151   for (len = Utf8Decode(&c, str); c != '\0'; len = Utf8Decode(&c, str)) {
    00152     if (c < SCC_BLUE || c > SCC_BLACK) {
    00153       /* Copy the character back. Even if dst is current the same as str
    00154        * (i.e. no characters have been changed) this is quicker than
    00155        * moving the pointers ahead by len */
    00156       do {
    00157         *dst++ = *str++;
    00158       } while (--len != 0);
    00159     } else {
    00160       /* Just skip (strip) the colour codes */
    00161       str += len;
    00162     }
    00163   }
    00164   *dst = '\0';
    00165 }
    00166
    00175 void strtolower(char *str)
    00176 {
    00177   for (; *str != '\0'; str++) *str = tolower(*str);
    00178 }
    00179
    00187 bool IsValidChar(WChar key, CharSetFilter afilter)
    00188 {
    00189   switch (afilter) {
    00190     case CS_ALPHANUMERAL: return IsPrintable(key);
    00191     case CS_NUMERAL:      return (key >= '0' && key <= '9');
    00192     case CS_ALPHA:        return IsPrintable(key) && !(key >= '0' && key <= '9');
    00193   }
    00194
    00195   return false;
    00196 }
    00197
    00198 #ifdef WIN32
    00199 /* Since version 3.14, MinGW Runtime has snprintf() and vsnprintf() conform to C99 but it's not the case for older versions */
    00200 #if (__MINGW32_MAJOR_VERSION < 3) || ((__MINGW32_MAJOR_VERSION == 3) && (__MINGW32_MINOR_VERSION < 14))
    00201 int CDECL snprintf(char *str, size_t size, const char *format, ...)
    00202 {
    00203   va_list ap;
    00204   int ret;
    00205
    00206   va_start(ap, format);
    00207   ret = vsnprintf(str, size, format, ap);
    00208   va_end(ap);
    00209   return ret;
    00210 }
    00211 #endif /* MinGW Runtime < 3.14 */
    00212
    00213 #ifdef _MSC_VER
    00214 /* *nprintf broken, not POSIX compliant, MSDN description
    00215  * - If len < count, then len characters are stored in buffer, a null-terminator is appended, and len is returned.
    00216  * - If len = count, then len characters are stored in buffer, no null-terminator is appended, and len is returned.
    00217  * - If len > count, then count characters are stored in buffer, no null-terminator is appended, and a negative value is returned
    00218  */
    00219 int CDECL vsnprintf(char *str, size_t size, const char *format, va_list ap)
    00220 {
    00221   int ret;
    00222   ret = _vsnprintf(str, size, format, ap);
    00223   if (ret < 0 || ret == size) str[size - 1] = '\0';
    00224   return ret;
    00225 }
    00226 #endif /* _MSC_VER */
    00227
    00228 #endif /* WIN32 */
    00229
    00239 int CDECL seprintf(char *str, const char *last, const char *format, ...)
    00240 {
    00241   va_list ap;
    00242
    00243   va_start(ap, format);
    00244   int ret = vseprintf(str, last, format, ap);
    00245   va_end(ap);
    00246   return ret;
    00247 }
    00248
    00249
    00255 char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16])
    00256 {
    00257   char *p = buf;
    00258
    00259   for (uint i = 0; i < 16; i++) {
    00260     p += seprintf(p, last, "%02X", md5sum[i]);
    00261   }
    00262
    00263   return p;
    00264 }
    00265
    00266
    00267 /* UTF-8 handling routines */
    00268
    00269
    00270 /* Decode and consume the next UTF-8 encoded character
    00271  * @param c Buffer to place decoded character.
    00272  * @param s Character stream to retrieve character from.
    00273  * @return Number of characters in the sequence.
    00274  */
    00275 size_t Utf8Decode(WChar *c, const char *s)
    00276 {
    00277   assert(c != NULL);
    00278
    00279   if (!HasBit(s[0], 7)) {
    00280     /* Single byte character: 0xxxxxxx */
    00281     *c = s[0];
    00282     return 1;
    00283   } else if (GB(s[0], 5, 3) == 6) {
    00284     if (IsUtf8Part(s[1])) {
    00285       /* Double byte character: 110xxxxx 10xxxxxx */
    00286       *c = GB(s[0], 0, 5) << 6 | GB(s[1], 0, 6);
    00287       if (*c >= 0x80) return 2;
    00288     }
    00289   } else if (GB(s[0], 4, 4) == 14) {
    00290     if (IsUtf8Part(s[1]) && IsUtf8Part(s[2])) {
    00291       /* Triple byte character: 1110xxxx 10xxxxxx 10xxxxxx */
    00292       *c = GB(s[0], 0, 4) << 12 | GB(s[1], 0, 6) << 6 | GB(s[2], 0, 6);
    00293       if (*c >= 0x800) return 3;
    00294     }
    00295   } else if (GB(s[0], 3, 5) == 30) {
    00296     if (IsUtf8Part(s[1]) && IsUtf8Part(s[2]) && IsUtf8Part(s[3])) {
    00297       /* 4 byte character: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
    00298       *c = GB(s[0], 0, 3) << 18 | GB(s[1], 0, 6) << 12 | GB(s[2], 0, 6) << 6 | GB(s[3], 0, 6);
    00299       if (*c >= 0x10000 && *c <= 0x10FFFF) return 4;
    00300     }
    00301   }
    00302
    00303   /* DEBUG(misc, 1, "[utf8] invalid UTF-8 sequence"); */
    00304   *c = '?';
    00305   return 1;
    00306 }
    00307
    00308
    00309 /* Encode a unicode character and place it in the buffer
    00310  * @param buf Buffer to place character.
    00311  * @param c   Unicode character to encode.
    00312  * @return Number of characters in the encoded sequence.
    00313  */
    00314 size_t Utf8Encode(char *buf, WChar c)
    00315 {
    00316   if (c < 0x80) {
    00317     *buf = c;
    00318     return 1;
    00319   } else if (c < 0x800) {
    00320     *buf++ = 0xC0 + GB(c,  6, 5);
    00321     *buf   = 0x80 + GB(c,  0, 6);
    00322     return 2;
    00323   } else if (c < 0x10000) {
    00324     *buf++ = 0xE0 + GB(c, 12, 4);
    00325     *buf++ = 0x80 + GB(c,  6, 6);
    00326     *buf   = 0x80 + GB(c,  0, 6);
    00327     return 3;
    00328   } else if (c < 0x110000) {
    00329     *buf++ = 0xF0 + GB(c, 18, 3);
    00330     *buf++ = 0x80 + GB(c, 12, 6);
    00331     *buf++ = 0x80 + GB(c,  6, 6);
    00332     *buf   = 0x80 + GB(c,  0, 6);
    00333     return 4;
    00334   }
    00335
    00336   /* DEBUG(misc, 1, "[utf8] can't UTF-8 encode value 0x%X", c); */
    00337   *buf = '?';
    00338   return 1;
    00339 }
    00340
    00348 size_t Utf8TrimString(char *s, size_t maxlen)
    00349 {
    00350   size_t length = 0;
    00351
    00352   for (const char *ptr = strchr(s, '\0'); *s != '\0';) {
    00353     size_t len = Utf8EncodedCharLen(*s);
    00354     /* Silently ignore invalid UTF8 sequences, our only concern trimming */
    00355     if (len == 0) len = 1;
    00356
    00357     /* Take care when a hard cutoff was made for the string and
    00358      * the last UTF8 sequence is invalid */
    00359     if (length + len >= maxlen || (s + len > ptr)) break;
    00360     s += len;
    00361     length += len;
    00362   }
    00363
    00364   *s = '\0';
    00365   return length;
    00366 }
    00367
    00368 #ifndef _GNU_SOURCE
    00369 #include "core/math_func.hpp"
    00370 char *strndup(const char *s, size_t len)
    00371 {
    00372   len = min(strlen(s), len);
    00373   char *tmp = CallocT<char>(len + 1);
    00374   memcpy(tmp, s, len);
    00375   return tmp;
    00376 }
    00377 #endif /* !_GNU_SOURCE */
    00378
    00379 #ifdef DEFINE_STRCASESTR
    00380 const char *strcasestr(const char *haystack, const char *needle)
    00381 {
    00382   size_t hay_len = strlen(haystack);
    00383   size_t needle_len = strlen(needle);
    00384   while (hay_len >= needle_len) {
    00385     if (strncasecmp(haystack, needle, needle_len) == 0) return haystack;
    00386
    00387     haystack++;
    00388     hay_len--;
    00389   }
    00390
    00391   return NULL;
    00392 }
    00393 #endif /* DEFINE_STRCASESTR */