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sys2utf8.c (2901B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 
     22 #include "geniconv.h"
     23 #include <stdlib.h>
     24 
     25 int StrUTF8(int fToUTF8, char *pcDst, int cbDst, char *pcSrc, int cbSrc)
     26 {
     27     size_t  rc;
     28     char   *pcDstStart = pcDst;
     29     iconv_t cd;
     30     char   *pszToCP, *pszFromCP;
     31     int     fError = 0;
     32 
     33     if (cbDst < 4)
     34         return -1;
     35 
     36     if (fToUTF8) {
     37         pszToCP   = "UTF-8";
     38         pszFromCP = "";
     39     } else {
     40         pszToCP   = "";
     41         pszFromCP = "UTF-8";
     42     }
     43 
     44     cd = iconv_open(pszToCP, pszFromCP);
     45     if (cd == (iconv_t)-1)
     46         return -1;
     47 
     48     while (cbSrc > 0) {
     49         rc = iconv(cd, &pcSrc, (size_t *)&cbSrc, &pcDst, (size_t *)&cbDst);
     50         if (rc == (size_t)-1) {
     51             if (errno == EILSEQ) {
     52                 /* Try to skip invalid character */
     53                 pcSrc++;
     54                 cbSrc--;
     55                 continue;
     56             }
     57 
     58             fError = 1;
     59             break;
     60         }
     61     }
     62 
     63     iconv_close(cd);
     64 
     65     /* Write trailing ZERO (1 byte for UTF-8, 2 bytes for the system cp) */
     66     if (fToUTF8) {
     67         if (cbDst < 1) {
     68             pcDst--;
     69             fError = 1; /* The destination buffer overflow */
     70         }
     71         *pcDst = '\0';
     72     } else {
     73         if (cbDst < 2) {
     74             pcDst -= (cbDst == 0)? 2 : 1;
     75             fError = 1; /* The destination buffer overflow */
     76         }
     77         *((short *)pcDst) = '\0';
     78     }
     79 
     80     return (fError) ? -1 : (pcDst - pcDstStart);
     81 }
     82 
     83 char *StrUTF8New(int fToUTF8, char *pcStr, int cbStr)
     84 {
     85     int   cbNewStr = (((cbStr > 4)? cbStr : 4) + 1) * 2;
     86     char *pszNewStr = (char *) malloc(cbNewStr);
     87 
     88     if (pszNewStr == NULL)
     89         return NULL;
     90 
     91     cbNewStr = StrUTF8(fToUTF8, pszNewStr, cbNewStr, pcStr, cbStr);
     92     if (cbNewStr != -1) {
     93         pcStr = (char *) realloc(pszNewStr, cbNewStr + ((fToUTF8)? 1 : sizeof(short)));
     94         if (pcStr)
     95             return pcStr;
     96     }
     97 
     98     free(pszNewStr);
     99     return NULL;
    100 }
    101 
    102 void StrUTF8Free(char *pszStr)
    103 {
    104     free(pszStr);
    105 }
    106 
    107 /* vi: set ts=4 sw=4 expandtab: */