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ICU-410 add u_fgetcx (unescaping u_fgetc)

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X-SVN-Rev: 1898
This commit is contained in:
Alan Liu 2000-07-16 13:43:15 +00:00
parent 5e9d055754
commit 81f0a973af
2 changed files with 67 additions and 0 deletions
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16
icu4c/source/extra/ustdio/unicode/ustdio.h
View File

@ -324,6 +324,22 @@ u_fgets(UFILE *f,
U_CAPI UChar U_EXPORT2
u_fgetc(UFILE *f);
/**
* Read a UChar from a UFILE and process escape sequences. If the
* next character is not a backslash, this is the same as calling
* u_fgetc(). If it is, then additional characters comprising the
* escape sequence will be read from the UFILE, parsed, and the
* resultant UChar returned. Ill-formed escape sequences return
* U+FFFFFFFF.
* @param f The UFILE from which to read.
* @return The UChar value read, or U+FFFF if no character was
* available, or U+FFFFFFFF if an ill-formed escape sequence was
* encountered.
* @see u_unescape()
*/
U_CAPI UChar32 U_EXPORT2
u_fgetcx(UFILE *f);
/**
* Unget a UChar from a UFILE.
* If this function is not the first to operate on <TT>f</TT> after a call

51
icu4c/source/extra/ustdio/ustdio.c
View File

@ -281,6 +281,57 @@ u_fgetc(UFILE *f)
}
}
/* u_unescapeAt() callback to return a UChar from a UFILE */
static UChar _charAt(int32_t offset, void *context) {
return ((UFILE*) context)->fUCPos[offset];
}
/* Read a UChar from a UFILE and process escape sequences */
UChar32
u_fgetcx(UFILE *f) {
int32_t length;
int32_t offset;
UChar32 c32;
UChar c16;
/* Fill the buffer if it is empty */
if (f->fUCPos >= f->fUCLimit) {
ufile_fill_uchar_buffer(f);
}
/* Get the next character in the buffer */
if (f->fUCPos < f->fUCLimit) {
c16 = *(f->fUCPos)++;
} else {
c16 = U_EOF;
}
/* If it isn't a backslash, return it */
if (c16 != 0x005C /*'\\'*/) {
return c16;
}
/* Determine the amount of data in the buffer */
length = f->fUCLimit - f->fUCPos;
/* The longest escape sequence is \Uhhhhhhhh; make sure
we have at least that many characters */
if (length < 10) {
/* fill the buffer */
ufile_fill_uchar_buffer(f);
length = f->fUCLimit - f->fUCPos;
}
/* Process the escape */
offset = 0;
c32 = u_unescapeAt(_charAt, &offset, length, (void*)f);
/* Update the current buffer position */
f->fUCPos += offset;
return c32;
}
UChar
u_fungetc(UChar c,
UFILE *f)