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025832c385
[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`.
e3488256b4
Co-Authored-By: Nobuyoshi Nakada <nobu@ruby-lang.org>
36 lines
1,018 B
C
36 lines
1,018 B
C
#include "prism/util/pm_strncasecmp.h"
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/**
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* A locale-insensitive version of `tolower(3)`
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*/
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static inline int
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pm_tolower(int c)
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{
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if ('A' <= c && c <= 'Z') {
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return c | 0x20;
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}
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return c;
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}
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/**
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* Compare two strings, ignoring case, up to the given length. Returns 0 if the
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* strings are equal, a negative number if string1 is less than string2, or a
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* positive number if string1 is greater than string2.
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*
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* Note that this is effectively our own implementation of strncasecmp, but it's
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* not available on all of the platforms we want to support so we're rolling it
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* here.
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*/
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int
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pm_strncasecmp(const uint8_t *string1, const uint8_t *string2, size_t length) {
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size_t offset = 0;
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int difference = 0;
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while (offset < length && string1[offset] != '\0') {
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if (string2[offset] == '\0') return string1[offset];
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if ((difference = pm_tolower(string1[offset]) - pm_tolower(string2[offset])) != 0) return difference;
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offset++;
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}
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return difference;
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}
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