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Remove top-level const from function-scope variables

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As per the const correctness rules, top-level const-ness of data
in automatic scopes does not propagate outside of these scopes
(unlike const-ness at lower levels, such as pointers to const data).

Previously, const was used liberally, but inconsistently across the
libpng codebase. Using const wherever applicable is not incorrect.
However, _consistent_ use of const is difficult to maintain in such
conditions.

In conclusion, we shall continue to use const only where doing so is
strictly necessary:

1. If a function guarantees that it will not modify an argument
   passed by pointer, the corresponding function parameter should be
   a pointer-to-const (const T *).

2. Static data should not be modified, therefore it should be const.

Reference:
Google C++ Style Guide
https://google.github.io/styleguide/cppguide.html#Use_of_const
This commit is contained in:
Cosmin Truta
2018-08-18 22:47:16 -04:00
parent 1ef8882814
commit ceb327789b
22 changed files with 196 additions and 205 deletions
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4
contrib/tools/pngfix.c
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@@ -2514,7 +2514,7 @@ zlib_run(struct zlib *zlib)
*/
for (;;)
{
const unsigned int count = list->count;
unsigned int count = list->count;
unsigned int i;
for (i = 0; i<count; ++i)
@@ -2791,7 +2791,7 @@ process_chunk(struct file *file, png_uint_32 file_crc, png_uint_32 next_length,
* to read_chunk.
*/
{
const png_uint_32 type = file->type;
png_uint_32 type = file->type;
if (file->global->verbose > 1)
{