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#include "prism/util/pm_memchr.h"
#define PRISM_MEMCHR_TRAILING_BYTE_MINIMUM 0x40
/**
* We need to roll our own memchr to handle cases where the encoding changes and
* we need to search for a character in a buffer that could be the trailing byte
* of a multibyte character.
*/
void *
pm_memchr(const void *memory, int character, size_t number, bool encoding_changed, const pm_encoding_t *encoding) {
if (encoding_changed && encoding->multibyte && character >= PRISM_MEMCHR_TRAILING_BYTE_MINIMUM) {
const uint8_t *source = (const uint8_t *) memory;
size_t index = 0;
while (index < number) {
if (source[index] == character) {
return (void *) (source + index);
}
size_t width = encoding->char_width(source + index, (ptrdiff_t) (number - index));
if (width == 0) {
return NULL;
}
index += width;
}
return NULL;
} else {
return memchr(memory, character, number);
}
}
#undef PRISM_MEMCHR_TRAILING_BYTE_MINIMUM
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