48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
#if defined(_WIN32)
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// from https://stackoverflow.com/questions/40159892/using-asprintf-on-windows
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#include <stdio.h> /* needed for vsnprintf */
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#include <stdlib.h> /* needed for malloc, free */
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#include <stdarg.h> /* needed for va_* */
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int vscprintf(const char *format, va_list ap)
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{
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va_list ap_copy;
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va_copy(ap_copy, ap);
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int retval = vsnprintf(NULL, 0, format, ap_copy);
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va_end(ap_copy);
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return retval;
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}
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/*
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* asprintf, vasprintf:
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* MSVC does not implement these, thus we implement them here
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* GNU-C-compatible compilers implement these with the same names, thus we
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* don't have to do anything
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*/
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int vasprintf(char **strp, const char *format, va_list ap)
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{
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int len = vscprintf(format, ap);
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if (len == -1)
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return -1;
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char *str = (char*)malloc((size_t) len + 1);
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if (!str)
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return -1;
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int retval = vsnprintf(str, len + 1, format, ap);
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if (retval == -1) {
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free(str);
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return -1;
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}
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*strp = str;
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return retval;
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}
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int asprintf(char **strp, const char *format, ...)
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{
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va_list ap;
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va_start(ap, format);
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int retval = vasprintf(strp, format, ap);
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va_end(ap);
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return retval;
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}
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#endif
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