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[v2,17/26] git-compat-util.h: implement checked size_t to uint32_t conversion

Message ID 6ede9e060332a0850269fe69a7a3a15ac229344b.1702592604.git.me@ttaylorr.com (mailing list archive)
State Accepted
Commit ed9f41480a32fff7f3ec66ba2d4bf618885e6ad2
Headers show
Series pack-objects: multi-pack verbatim reuse | expand

Commit Message

Taylor Blau Dec. 14, 2023, 10:24 p.m. UTC 
In a similar fashion as other checked cast functions in this header
(such as `cast_size_t_to_ulong()` and `cast_size_t_to_int()`), implement
a checked cast function for going from a size_t to a uint32_t value.

This function will be utilized in a future commit which needs to make
such a conversion.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 git-compat-util.h | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/git-compat-util.h b/git-compat-util.h
index 3e7a59b5ff..c3b6c2c226 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1013,6 +1013,15 @@  static inline unsigned long cast_size_t_to_ulong(size_t a)
 	return (unsigned long)a;
 }
 
+static inline uint32_t cast_size_t_to_uint32_t(size_t a)
+{
+	if (a != (uint32_t)a)
+		die("object too large to read on this platform: %"
+		    PRIuMAX" is cut off to %u",
+		    (uintmax_t)a, (uint32_t)a);
+	return (uint32_t)a;
+}
+
 static inline int cast_size_t_to_int(size_t a)
 {
 	if (a > INT_MAX)