41e7c31387
* When building with MSVC, there is no snprintf function, but there are _snprintf, vsnprintf, and _vsnprintf functions (as well as many variations on these). The MSVC _snprintf is not the same as C99's snprintf, and in particular, it does not guarantee that the buffer is NUL-terminated, whereas C99 does guarantee this. I want the C99 behavior, so add a c99_[v]snprintf functions in shared/c99_snprintf.h that provide C99 behavior. * Details: http://stackoverflow.com/questions/2915672/snprintf-and-visual-studio-2010
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
// Copyright (c) 2012 Ryan Prichard
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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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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//
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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 THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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#ifndef C99_SNPRINTF_H
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#define C99_SNPRINTF_H
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#include <stdarg.h>
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#include <stdio.h>
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#ifdef _MSC_VER
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/* MSVC does not define C99's va_copy, so define one for it. It appears that
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* with MSVC, a va_list is a char*, not an array type, so va_copy is a simple
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* assignment. On MSVC 2012, there is a VC/include/vadefs.h file defining
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* va_list and the va_XXX routines, which has code for x86, x86-64, and ARM. */
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#define c99_va_copy(dest, src) ((dest) = (src))
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static inline int c99_vsnprintf(
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char* str,
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size_t size,
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const char* format,
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va_list ap)
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{
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va_list apcopy;
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int count = -1;
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if (size != 0) {
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c99_va_copy(apcopy, ap);
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count = _vsnprintf_s(str, size, _TRUNCATE, format, apcopy);
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va_end(apcopy);
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}
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if (count == -1) {
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c99_va_copy(apcopy, ap);
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count = _vscprintf(format, apcopy);
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va_end(apcopy);
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}
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return count;
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}
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#else
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#define c99_va_copy(dest, src) (va_copy(dest, src))
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static inline int c99_vsnprintf(
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char* str,
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size_t size,
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const char* format,
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va_list ap)
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{
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return vsnprintf(str, size, format, ap);
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}
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#endif /* _MSC_VER */
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static inline int c99_snprintf(
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char* str,
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size_t size,
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const char* format,
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...)
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{
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int count;
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va_list ap;
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va_start(ap, format);
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count = c99_vsnprintf(str, size, format, ap);
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va_end(ap);
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return count;
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}
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#endif /* C99_SNPRINTF_H */
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