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POcreating va_list dynamically in GCC - can it be done?
 

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  1. POcreating va_list dynamically in GCC - can it be done?
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    <p>my problem with <code>vsprintf</code> is that I can not obtain input arguments directly, I have to first get inputs one by one and save them in <code>void**</code>, then pass this <code>void**</code> to <code>vsprintf()</code>, it is all fine for windows, but when I come to 64bit linux, gcc cannot compile because it is not allowed to convert from <code>void**</code> to <code>va_list</code>, Is there anyone that can give me some help how I should do this under linux? </p> <p><strong>Can I create va_list dynamically in GCC?</strong></p> <pre><code>void getInputArgs(char* str, char* format, ...) { va_list args; va_start(args, format); vsprintf(str, format, args); va_end(args); } void process(void) { char s[256]; double tempValue; char * tempString = NULL; void ** args_ptr = NULL; ArgFormatType format; //defined in the lib I used in the code int numOfArgs = GetNumInputArgs(); // library func used in my code if(numOfArgs&gt;1) { args_ptr = (void**) malloc(sizeof(char)*(numOfArgs-1)); for(i=2; i&lt;numOfArgs; i++) { format = GetArgType(); //library funcs switch(format) { case ArgType_double: CopyInDoubleArg(i, TRUE, &amp;tempValue); //lib func args_ptr[i-2] = (void*) (int)tempValue; break; case ArgType_char: args_ptr[i-2]=NULL; AllocInCharArg(i, TRUE, &amp;tempString); //lib func args_ptr[i-2]= tempString; break; } } } getInputArgs(s, formatString, (va_list) args_ptr); //Here // is the location where gcc cannot compile, // Can I and how if I can create a va_list myself? } </code></pre>
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    1. USuser1558064
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    1. COpossible duplicate of [vsprintf, using sprintf to get inputs?](http://stackoverflow.com/questions/11693448/vsprintf-using-sprintf-to-get-inputs)
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      1. USSean Bright
    2. COit's not duplicate, because here it is GCC-specific.
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      1. USWill Ness
    3. COThis question and [SO 11693448](http://stackoverflow.com/q/11693448) are very closely related, though they are not quite exact duplicates.
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      1. POcreating va_list dynamically in GCC - can it be done?
      1. USJonathan Leffler
 

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