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Use a locale-insensitive version of tolower #3482

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Merged
kddnewton merged 1 commit into from
Feb 28, 2025
Merged

Use a locale-insensitive version of tolower #3482

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14 changes: 13 additions & 1 deletion src/util/pm_strncasecmp.c
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Original file line number Diff line number Diff line change
@@ -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
Expand All @@ -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++;
}

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