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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170// SPDX-License-Identifier: GPL-2.0#include <linux/ucs2_string.h>#include <linux/module.h>
/* Return the number of unicode characters in data */unsigned longucs2_strnlen(const ucs2_char_t *s, size_t maxlength){ unsigned long length = 0;
while (*s++ != 0 && length < maxlength) length++; return length;}EXPORT_SYMBOL(ucs2_strnlen);
unsigned longucs2_strlen(const ucs2_char_t *s){ return ucs2_strnlen(s, ~0UL);}EXPORT_SYMBOL(ucs2_strlen);
/* * Return the number of bytes is the length of this string * Note: this is NOT the same as the number of unicode characters */unsigned longucs2_strsize(const ucs2_char_t *data, unsigned long maxlength){ return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);}EXPORT_SYMBOL(ucs2_strsize);
/** * ucs2_strscpy() - Copy a UCS2 string into a sized buffer. * * @dst: Pointer to the destination buffer where to copy the string to. * @src: Pointer to the source buffer where to copy the string from. * @count: Size of the destination buffer, in UCS2 (16-bit) characters. * * Like strscpy(), only for UCS2 strings. * * Copy the source string @src, or as much of it as fits, into the destination * buffer @dst. The behavior is undefined if the string buffers overlap. The * destination buffer @dst is always NUL-terminated, unless it's zero-sized. * * Return: The number of characters copied into @dst (excluding the trailing * %NUL terminator) or -E2BIG if @count is 0 or @src was truncated due to the * destination buffer being too small. */ssize_t ucs2_strscpy(ucs2_char_t *dst, const ucs2_char_t *src, size_t count){ long res;
/* * Ensure that we have a valid amount of space. We need to store at * least one NUL-character. */ if (count == 0 || WARN_ON_ONCE(count > INT_MAX / sizeof(*dst))) return -E2BIG;
/* * Copy at most 'count' characters, return early if we find a * NUL-terminator. */ for (res = 0; res < count; res++) { ucs2_char_t c;
c = src[res]; dst[res] = c;
if (!c) return res; }
/* * The loop above terminated without finding a NUL-terminator, * exceeding the 'count': Enforce proper NUL-termination and return * error. */ dst[count - 1] = 0; return -E2BIG;}EXPORT_SYMBOL(ucs2_strscpy);
intucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len){ while (1) { if (len == 0) return 0; if (*a < *b) return -1; if (*a > *b) return 1; if (*a == 0) /* implies *b == 0 */ return 0; a++; b++; len--; }}EXPORT_SYMBOL(ucs2_strncmp);
unsigned longucs2_utf8size(const ucs2_char_t *src){ unsigned long i; unsigned long j = 0;
for (i = 0; src[i]; i++) { u16 c = src[i];
if (c >= 0x800) j += 3; else if (c >= 0x80) j += 2; else j += 1; }
return j;}EXPORT_SYMBOL(ucs2_utf8size);
/* * copy at most maxlength bytes of whole utf8 characters to dest from the * ucs2 string src. * * The return value is the number of characters copied, not including the * final NUL character. */unsigned longucs2_as_utf8(u8 *dest, const ucs2_char_t *src, unsigned long maxlength){ unsigned int i; unsigned long j = 0; unsigned long limit = ucs2_strnlen(src, maxlength);
for (i = 0; maxlength && i < limit; i++) { u16 c = src[i];
if (c >= 0x800) { if (maxlength < 3) break; maxlength -= 3; dest[j++] = 0xe0 | (c & 0xf000) >> 12; dest[j++] = 0x80 | (c & 0x0fc0) >> 6; dest[j++] = 0x80 | (c & 0x003f); } else if (c >= 0x80) { if (maxlength < 2) break; maxlength -= 2; dest[j++] = 0xc0 | (c & 0x7c0) >> 6; dest[j++] = 0x80 | (c & 0x03f); } else { maxlength -= 1; dest[j++] = c & 0x7f; } } if (maxlength) dest[j] = '\0'; return j;}EXPORT_SYMBOL(ucs2_as_utf8);
MODULE_DESCRIPTION("UCS2 string handling");MODULE_LICENSE("GPL v2");