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@ -20,6 +20,10 @@
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#include <stdarg.h>
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#include <ctype.h> /* required for tolower() */
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#ifdef _MSC_VER
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#include <errno.h> // required by vsnprintf implementation for MSVC
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#endif
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/**
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* Safer implementation of vsnprintf; same as vsnprintf except:
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* - last instead of size, i.e. replace sizeof with lastof.
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@ -219,17 +223,37 @@ int CDECL snprintf(char *str, size_t size, const char *format, ...)
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#endif /* MinGW Runtime < 3.14 */
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#ifdef _MSC_VER
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/* *nprintf broken, not POSIX compliant, MSDN description
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* - If len < count, then len characters are stored in buffer, a null-terminator is appended, and len is returned.
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* - If len = count, then len characters are stored in buffer, no null-terminator is appended, and len is returned.
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* - If len > count, then count characters are stored in buffer, no null-terminator is appended, and a negative value is returned
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/**
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* Almost POSIX compliant implementation of \c vsnprintf for VC compiler.
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* The difference is in the value returned on output truncation. This
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* implementation returns size whereas a POSIX implementation returns
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* size or more (the number of bytes that would be written to str
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* had size been sufficiently large excluding the terminating null byte).
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*/
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int CDECL vsnprintf(char *str, size_t size, const char *format, va_list ap)
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{
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int ret;
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ret = _vsnprintf(str, size, format, ap);
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if (ret < 0 || ret == size) str[size - 1] = '\0';
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return ret;
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if (size == 0) return 0;
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errno = 0;
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int ret = _vsnprintf(str, size, format, ap);
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if (ret < 0) {
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if (errno != ERANGE) {
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/* There's a formatting error, better get that looked
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* at properly instead of ignoring it. */
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NOT_REACHED();
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}
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} else if ((size_t)ret < size) {
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/* The buffer is big enough for the number of
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* characers stored (excluding null), i.e.
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* the string has been null-terminated. */
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return ret;
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}
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/* The buffer is too small for _vsnprintf to write the
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* null-terminator at its end and return size. */
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str[size - 1] = '\0';
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return size;
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}
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#endif /* _MSC_VER */
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