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-rw-r--r--include/llvm/Support/Format.h61
1 files changed, 27 insertions, 34 deletions
diff --git a/include/llvm/Support/Format.h b/include/llvm/Support/Format.h
index 2ab097f..df03f66 100644
--- a/include/llvm/Support/Format.h
+++ b/include/llvm/Support/Format.h
@@ -36,6 +36,10 @@ class format_object_base {
protected:
const char *Fmt;
virtual void home(); // Out of line virtual method.
+
+ /// snprint - Call snprintf() for this object, on the given buffer and size.
+ virtual int snprint(char *Buffer, unsigned BufferSize) const = 0;
+
public:
format_object_base(const char *fmt) : Fmt(fmt) {}
virtual ~format_object_base() {}
@@ -43,7 +47,23 @@ public:
/// print - Format the object into the specified buffer. On success, this
/// returns the length of the formatted string. If the buffer is too small,
/// this returns a length to retry with, which will be larger than BufferSize.
- virtual unsigned print(char *Buffer, unsigned BufferSize) const = 0;
+ unsigned print(char *Buffer, unsigned BufferSize) const {
+ assert(BufferSize && "Invalid buffer size!");
+
+ // Print the string, leaving room for the terminating null.
+ int N = snprint(Buffer, BufferSize);
+
+ // VC++ and old GlibC return negative on overflow, just double the size.
+ if (N < 0)
+ return BufferSize*2;
+
+ // Other impls yield number of bytes needed, not including the final '\0'.
+ if (unsigned(N) >= BufferSize)
+ return N+1;
+
+ // Otherwise N is the length of output (not including the final '\0').
+ return N;
+ }
};
/// format_object1 - This is a templated helper class used by the format
@@ -58,17 +78,8 @@ public:
: format_object_base(fmt), Val(val) {
}
- /// print - Format the object into the specified buffer. On success, this
- /// returns the length of the formatted string. If the buffer is too small,
- /// this returns a length to retry with, which will be larger than BufferSize.
- virtual unsigned print(char *Buffer, unsigned BufferSize) const {
- int N = snprintf(Buffer, BufferSize-1, Fmt, Val);
- if (N < 0) // VC++ and old GlibC return negative on overflow.
- return BufferSize*2;
- if (unsigned(N) >= BufferSize-1)// Other impls yield number of bytes needed.
- return N+1;
- // If N is positive and <= BufferSize-1, then the string fit, yay.
- return N;
+ virtual int snprint(char *Buffer, unsigned BufferSize) const {
+ return snprintf(Buffer, BufferSize, Fmt, Val);
}
};
@@ -85,17 +96,8 @@ public:
: format_object_base(fmt), Val1(val1), Val2(val2) {
}
- /// print - Format the object into the specified buffer. On success, this
- /// returns the length of the formatted string. If the buffer is too small,
- /// this returns a length to retry with, which will be larger than BufferSize.
- virtual unsigned print(char *Buffer, unsigned BufferSize) const {
- int N = snprintf(Buffer, BufferSize-1, Fmt, Val1, Val2);
- if (N < 0) // VC++ and old GlibC return negative on overflow.
- return BufferSize*2;
- if (unsigned(N) >= BufferSize-1)// Other impls yield number of bytes needed.
- return N+1;
- // If N is positive and <= BufferSize-1, then the string fit, yay.
- return N;
+ virtual int snprint(char *Buffer, unsigned BufferSize) const {
+ return snprintf(Buffer, BufferSize, Fmt, Val1, Val2);
}
};
@@ -113,17 +115,8 @@ public:
: format_object_base(fmt), Val1(val1), Val2(val2), Val3(val3) {
}
- /// print - Format the object into the specified buffer. On success, this
- /// returns the length of the formatted string. If the buffer is too small,
- /// this returns a length to retry with, which will be larger than BufferSize.
- virtual unsigned print(char *Buffer, unsigned BufferSize) const {
- int N = snprintf(Buffer, BufferSize-1, Fmt, Val1, Val2, Val3);
- if (N < 0) // VC++ and old GlibC return negative on overflow.
- return BufferSize*2;
- if (unsigned(N) >= BufferSize-1)// Other impls yield number of bytes needed.
- return N+1;
- // If N is positive and <= BufferSize-1, then the string fit, yay.
- return N;
+ virtual int snprint(char *Buffer, unsigned BufferSize) const {
+ return snprintf(Buffer, BufferSize, Fmt, Val1, Val2, Val3);
}
};