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ICU-852 Redefine new u_mem functions

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X-SVN-Rev: 3709
This commit is contained in:
George Rhoten 2001-02-21 22:27:39 +00:00
parent 549e5f528c
commit 20d2995c74
2 changed files with 81 additions and 9 deletions
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39
icu4c/source/common/unicode/ustring.h
View File

@ -327,13 +327,13 @@ U_CAPI char* U_EXPORT2 u_austrncpy(char *dst,
/**
* synonym for uprv_memcpy
* Synonym for uprv_memcpy(), but with UChars only.
* @draft
*/
UChar *u_memcpy(UChar *dest, const UChar *src, int32_t count);
/**
* synonym for uprv_memmove
* Synonym for uprv_memmove(), but with UChars only.
* @draft
*/
UChar *u_memmove(UChar *dest, const UChar *src, int32_t count);
@ -350,22 +350,45 @@ UChar *u_memmove(UChar *dest, const UChar *src, int32_t count);
UChar *u_memset(UChar *dest, UChar c, int32_t count);
/**
* synonym for u_strncmp
* Compare the first <TT>count</TT> UChars of each buffer.
*
* @param buf1 The first string to compare.
* @param buf2 The second string to compare.
* @param count The maximum number of UChars to compare.
* @return When buf1 < buf2, a negative number is returned.
* When buf1 == buf2, 0 is returned.
* When buf1 > buf2, a positive number is returned.
* @draft
*/
#define u_memcmp(buf1, buf2, count) u_strncmp(buf1, buf2, count)
int32_t u_memcmp(UChar *buf1, UChar *buf2, int32_t count);
/**
* synonym for u_strchr
* Search for a UChar within a Unicode string until <TT>count</TT>
* is reached.
*
* @param src string to search in
* @param ch character to find
* @param count maximum number of UChars in <TT>src</TT>to search for
* <TT>ch</TT>.
* @return A pointer within src, pointing to <TT>ch</TT>, or NULL if it
* was not found.
* @draft
*/
#define u_memchr(buf, c, count) u_strchr(buf, c, count)
UChar *u_memchr(UChar *src, UChar ch, int32_t count);
/**
* synonym for u_strchr32
* Search for a UChar32 within a Unicode string until <TT>count</TT>
* is reached. This also includes surrogates in UTF-16.
*
* @param src string to search in
* @param ch character to find
* @param count maximum number of UChars in <TT>src</TT>to search for
* <TT>ch</TT>.
* @return A pointer within src, pointing to <TT>ch</TT>, or NULL if it
* was not found.
* @draft
*/
#define u_memchr32(buf, c, count) u_strchr32(buf, c, count)
UChar *u_memchr32(UChar *src, UChar32 ch, int32_t count);
/**
* Unicode String literals in C.

51
icu4c/source/common/ustring.c
View File

@ -444,12 +444,61 @@ u_memset(UChar *dest, UChar c, int32_t count) {
UChar *ptr = dest;
UChar *limit = dest + count;
while(ptr < limit) {
while (ptr < limit) {
*(ptr++) = c;
}
return dest;
}
int32_t
u_memcmp(UChar *buf1, UChar *buf2, int32_t count) {
UChar *limit = buf1 + count;
int32_t result;
while (buf1 < limit) {
result = (int32_t)(uint16_t)*buf1 - (int32_t)(uint16_t)*buf2;
if (result != 0) {
return result;
}
buf1++;
buf2++;
}
return 0;
}
UChar *
u_memchr(UChar *src, UChar ch, int32_t count) {
UChar *ptr = src;
UChar *limit = src + count;
while (ptr < limit) {
if (*ptr == ch) {
return ptr;
}
ptr++;
}
return NULL;
}
UChar *
u_memchr32(UChar *src, UChar32 ch, int32_t count) {
int32_t strItr = 0;
int32_t lastIndex;
UChar32 stringCh;
while (strItr < count) {
lastIndex = strItr;
UTF_NEXT_CHAR_SAFE(src, strItr, count, stringCh, TRUE);
if (stringCh == ch) {
return src + (strItr - (strItr - lastIndex));
}
}
return NULL;
}
/* string casing ------------------------------------------------------------ */
/*