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POHow do I read Unicode-16 strings from a file using POSIX methods in Linux?
 

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  1. POHow do I read Unicode-16 strings from a file using POSIX methods in Linux?
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    <p>I have a file containing UNICODE-16 strings that I would like to read into a Linux program. The strings were written raw from Windows' internal WCHAR format. (Does Windows always use UTF-16? e.g. in Japanese versions)</p> <p>I believe that I can read them using raw reads and the converting with wcstombs_l. However, I cannot figure what locale to use. Runing "locale -a" on my up-to-date Ubuntu and Mac OS X machines yields zero locales with utf-16 in their names.</p> <p>Is there a better way?</p> <p>Update: the correct answer and others below helped point me to using libiconv. Here's a function I'm using to do the conversion. I currently have it inside a class that makes the conversions into a one-line piece of code.</p> <pre><code>// Function for converting wchar_t* to char*. (Really: UTF-16LE --&gt; UTF-8) // It will allocate the space needed for dest. The caller is // responsible for freeing the memory. static int iwcstombs_alloc(char **dest, const wchar_t *src) { iconv_t cd; const char from[] = "UTF-16LE"; const char to[] = "UTF-8"; cd = iconv_open(to, from); if (cd == (iconv_t)-1) { printf("iconv_open(\"%s\", \"%s\") failed: %s\n", to, from, strerror(errno)); return(-1); } // How much space do we need? // Guess that we need the same amount of space as used by src. // TODO: There should be a while loop around this whole process // that detects insufficient memory space and reallocates // more space. int len = sizeof(wchar_t) * (wcslen(src) + 1); //printf("len = %d\n", len); // Allocate space int destLen = len * sizeof(char); *dest = (char *)malloc(destLen); if (*dest == NULL) { iconv_close(cd); return -1; } // Convert size_t inBufBytesLeft = len; char *inBuf = (char *)src; size_t outBufBytesLeft = destLen; char *outBuf = (char *)*dest; int rc = iconv(cd, &amp;inBuf, &amp;inBufBytesLeft, &amp;outBuf, &amp;outBufBytesLeft); if (rc == -1) { printf("iconv() failed: %s\n", strerror(errno)); iconv_close(cd); free(*dest); *dest = NULL; return -1; } iconv_close(cd); return 0; } // iwcstombs_alloc() </code></pre>
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