mirror of
https://github.com/python/cpython
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64be0b4aa5
than the argument string size, copy as many bytes as will fit (including a terminating '\0'), rather than not copying anything. This to make it satisfy the C99 spec.
97 lines
2 KiB
C
97 lines
2 KiB
C
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#include "Python.h"
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/* snprintf() emulation for platforms which don't have it (yet).
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Return value
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The number of characters printed (not including the trailing
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`\0' used to end output to strings) or a negative number in
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case of an error.
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PyOS_snprintf and PyOS_vsnprintf do not write more than size
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bytes (including the trailing '\0').
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If the output would have been truncated, they return the number
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of characters (excluding the trailing '\0') which would have
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been written to the final string if enough space had been
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available. This is inline with the C99 standard.
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*/
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#include <ctype.h>
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#ifndef HAVE_SNPRINTF
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static
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int myvsnprintf(char *str, size_t size, const char *format, va_list va)
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{
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char *buffer = PyMem_Malloc(size + 512);
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int len;
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if (buffer == NULL)
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return -1;
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len = vsprintf(buffer, format, va);
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if (len < 0) {
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PyMem_Free(buffer);
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return len;
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}
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len++;
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assert(len >= 0);
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if ((size_t)len > size + 512)
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Py_FatalError("Buffer overflow in PyOS_snprintf/PyOS_vsnprintf");
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if ((size_t)len > size)
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buffer[size-1] = '\0';
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else
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size = len;
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memcpy(str, buffer, size);
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PyMem_Free(buffer);
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return len - 1;
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}
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int PyOS_snprintf(char *str, size_t size, const char *format, ...)
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{
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int rc;
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va_list va;
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va_start(va, format);
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rc = myvsnprintf(str, size, format, va);
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va_end(va);
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return rc;
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}
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int PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
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{
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return myvsnprintf(str, size, format, va);
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}
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#else
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/* Make sure that a C API is included in the lib */
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#ifdef PyOS_snprintf
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# undef PyOS_snprintf
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#endif
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int PyOS_snprintf(char *str, size_t size, const char *format, ...)
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{
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int rc;
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va_list va;
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va_start(va, format);
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rc = vsnprintf(str, size, format, va);
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va_end(va);
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return rc;
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}
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#ifdef PyOS_vsnprintf
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# undef PyOS_vsnprintf
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#endif
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int PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
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{
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return vsnprintf(str, size, format, va);
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}
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#endif
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