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(INT_STRLEN_BOUND): New macro.

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Jim Meyering
2001-03-17 08:50:51 +00:00
parent 1499642b50
commit 9f9610d983
1 changed files with 5 additions and 0 deletions
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src/sys2.h
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@@ -488,6 +488,11 @@ enum
? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
/* Upper bound on the string length of an integer converted to string.
302 / 1000 is ceil (log10 (2.0)). Subtract 1 for the sign bit;
add 1 for integer division truncation; add 1 more for a minus sign. */
#define INT_STRLEN_BOUND(t) ((sizeof (t) * CHAR_BIT - 1) * 302 / 1000 + 2)
#ifndef CHAR_MIN
# define CHAR_MIN TYPE_MINIMUM (char)
#endif