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// Copyright 2020 Serge Martin
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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// Extract from Serge's printf clover code by airlied.
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/* Some versions of MinGW are missing _vscprintf's declaration, although they
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* still provide the symbol in the import library. */
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_CRTIMP int _vscprintf(const char *format, va_list argptr);
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#define va_copy(dest, src) __va_copy((dest), (src))
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#define va_copy(dest, src) (dest) = (src)
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size_t util_printf_next_spec_pos(const char *str, size_t pos)
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const char *str_found = str + pos;
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str_found = strchr(str_found, '%');
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if (str_found == NULL)
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if (*str_found == '%') {
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char *spec_pos = strpbrk(str_found, "cdieEfFgGaAosuxXp%");
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if (spec_pos == NULL) {
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} else if (*spec_pos == '%') {
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return spec_pos - str;
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size_t u_printf_length(const char *fmt, va_list untouched_args)
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/* Make a copy of the va_list so the original caller can still use it */
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va_copy(args, untouched_args);
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/* We need to use _vcsprintf to calculate the size as vsnprintf returns -1
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* if the number of characters to write is greater than count.
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size = _vscprintf(fmt, args);
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size = vsnprintf(&junk, 1, fmt, args);