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[ruby/prism] Use a locale-insensitive version of tolower

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[Bug #21161]

The `tolower` function provided by the libc is locale dependent
and can behave in ways you wouldn't expect for some value
of `LC_CTYPE`.

https://github.com/ruby/prism/commit/e3488256b4

Co-Authored-By: Nobuyoshi Nakada <nobu@ruby-lang.org>
This commit is contained in:
Jean Boussier 2025-02-27 21:53:38 +01:00 committed by git
parent d4b8da66ca
commit 025832c385
1 changed files with 13 additions and 1 deletions
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14
prism/util/pm_strncasecmp.c
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@ -1,5 +1,17 @@
#include "prism/util/pm_strncasecmp.h"
/**
* A locale-insensitive version of `tolower(3)`
*/
static inline int
pm_tolower(int c)
{
if ('A' <= c && c <= 'Z') {
return c | 0x20;
}
return c;
}
/**
* Compare two strings, ignoring case, up to the given length. Returns 0 if the
* strings are equal, a negative number if string1 is less than string2, or a
@ -16,7 +28,7 @@ pm_strncasecmp(const uint8_t *string1, const uint8_t *string2, size_t length) {
while (offset < length && string1[offset] != '\0') {
if (string2[offset] == '\0') return string1[offset];
if ((difference = tolower(string1[offset]) - tolower(string2[offset])) != 0) return difference;
if ((difference = pm_tolower(string1[offset]) - pm_tolower(string2[offset])) != 0) return difference;
offset++;
}