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37 lines
926 B
C
37 lines
926 B
C
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#include "xsnprintf.h"
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#include <assert.h>
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#include <limits.h>
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#include <stdio.h>
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size_t
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xvsnprintf(char *buf, size_t n, const char *format, va_list ap)
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{
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assert(n <= INT_MAX);
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int len = vsnprintf(buf, n, format, ap);
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/*
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* ISO C11 §7.21.6.5 states:
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* "The snprintf function returns the number of characters that
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* would have been written had n been sufficiently large, not
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* counting the terminating null character, or a negative value
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* if an encoding error occurred. Thus, the null-terminated output
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* has been completely written if and only if the returned value
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* is nonnegative and less than n."
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*/
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assert(len >= 0);
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assert(len < (int)n);
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return (size_t)len;
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}
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size_t
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xsnprintf(char *buf, size_t n, 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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size_t len = xvsnprintf(buf, n, format, ap);
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va_end(ap);
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return len;
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}
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