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#include <stdlib.h>
#include <Rdefines.h>
#define MAXELTSIZE 8192
typedef wchar_t xxx_ucs_t;
//int mbcs_get_next(int c, wchar_t *wc);
#if defined(Win32) || defined(__STDC_ISO_10646__)
typedef wchar_t ucs_t;
# define mbcs_get_next2 mbcs_get_next
#else
typedef unsigned int ucs_t;
# define WC_NOT_UNICODE
static int mbcs_get_next2(int c, ucs_t *wc)
{
#if 0
int i, res, clen = 1; char s[9];
s[0] = c;
/* This assumes (probably OK) that all MBCS embed ASCII as single-byte
lead bytes, including control chars */
if((unsigned int) c < 0x80) {
*wc = (wchar_t) c;
return 1;
}
if(utf8locale) {
clen = utf8clen(c);
for(i = 1; i < clen; i++) {
s[i] = xxgetc();
if(s[i] == R_EOF) {
PROBLEM "EOF whilst reading MBCS char"
ERROR;
}
}
s[clen] ='\0'; /* x86 Solaris requires this */
res = mbtoucs(wc, s, clen);
if(res == -1) {
PROBLEM "invalid multibyte character in parser"
ERROR;
}
} else {
/* This is not necessarily correct for stateful MBCS */
while(clen <= MB_CUR_MAX) {
res = mbtoucs(wc, s, clen);
if(res >= 0) break;
if(res == -1) {
PROBLEM "invalid multibyte character in parser"
ERROR;
}
/* so res == -2 */
c = xxgetc();
if(c == R_EOF) {
PROBLEM "EOF whilst reading MBCS char"
ERROR;
}
s[clen++] = c;
} /* we've tried enough, so must be complete or invalid by now */
}
for(i = clen - 1; i > 0; i--) xxungetc(s[i]);
return clen;
#else
return(0);
#endif
}
#endif
#define CTEXT_PUSH(c) do { \
if (ct - currtext >= 1000) {memmove(currtext, currtext+100, 901); memmove(currtext, "... ", 4); ct -= 100;} \
*ct++ = (c); \
} while(0)
#define CTEXT_POP() ct--
#define xxgetc() (int) ((char*)input)[pos++]
#define xxungetc(val) pos--
#define R_EOF '\0'
#define STEXT_PUSH(c) do { \
unsigned int nc = bp - stext; \
if (nc >= nstext - 1) { \
char *old = stext; \
nstext *= 2; \
stext = malloc(nstext); \
if(!stext) \
errorcall(R_NilValue, "unable to allocate buffer for long string"); \
memmove(stext, old, nc); \
if(old != st0) free(old); \
bp = stext+nc; } \
*bp++ = (c); \
} while(0)
#define WTEXT_PUSH(c) do { if(wcnt < 10000) wcs[wcnt++] = c; } while(0)
SEXP StringValue(void *input, int len)
{
Rboolean mbcslocale = TRUE;
SEXP yylval = R_NilValue;
int pos = 0;
int c = xxgetc();
int quote = c;
char currtext[1010], *ct = currtext;
char st0[MAXELTSIZE];
unsigned int nstext = MAXELTSIZE;
char *stext = st0, *bp = st0;
int wcnt = 0;
ucs_t wcs[10001];
Rboolean oct_or_hex = FALSE, use_wcs = FALSE;
while (pos < len && (c = xxgetc()) != R_EOF && c != quote) {
CTEXT_PUSH(c);
if (c == '\n') {
xxungetc(c);
/* Fix suggested by Mark Bravington to allow multiline strings
* by pretending we've seen a backslash. Was:
* return ERROR;
*/
c = '\\';
}
if (c == '\\') {
c = xxgetc(); CTEXT_PUSH(c);
if ('0' <= c && c <= '8') {
int octal = c - '0';
if ('0' <= (c = xxgetc()) && c <= '8') {
CTEXT_PUSH(c);
octal = 8 * octal + c - '0';
if ('0' <= (c = xxgetc()) && c <= '8') {
CTEXT_PUSH(c);
octal = 8 * octal + c - '0';
} else {
xxungetc(c);
CTEXT_POP();
}
} else {
xxungetc(c);
CTEXT_POP();
}
c = octal;
oct_or_hex = TRUE;
}
else if(c == 'x') {
int val = 0; int i, ext;
for(i = 0; i < 2; i++) {
c = xxgetc(); CTEXT_PUSH(c);
if(c >= '0' && c <= '9') ext = c - '0';
else if (c >= 'A' && c <= 'F') ext = c - 'A' + 10;
else if (c >= 'a' && c <= 'f') ext = c - 'a' + 10;
else {
xxungetc(c);
CTEXT_POP();
if (i == 0) { /* was just \x */
*ct = '\0';
PROBLEM "'\\x' used without hex digits in character string starting \"%s\"", currtext
ERROR;
}
break;
}
val = 16*val + ext;
}
c = val;
oct_or_hex = TRUE;
}
else if(c == 'u') {
unsigned int val = 0; int i, ext;
Rboolean delim = FALSE;
if((c = xxgetc()) == '{') {
delim = TRUE;
CTEXT_PUSH(c);
} else xxungetc(c);
for(i = 0; i < 4; i++) {
c = xxgetc(); CTEXT_PUSH(c);
if(c >= '0' && c <= '9') ext = c - '0';
else if (c >= 'A' && c <= 'F') ext = c - 'A' + 10;
else if (c >= 'a' && c <= 'f') ext = c - 'a' + 10;
else {
xxungetc(c);
CTEXT_POP();
if (i == 0) { /* was just \u */
*ct = '\0';
PROBLEM "'\\u' used without hex digits in character string starting \"%s\"", currtext
ERROR;
}
break;
}
val = 16*val + ext;
}
if(delim) {
if((c = xxgetc()) != '}') {
PROBLEM "invalid \\u{xxxx} sequence"
ERROR;
} else CTEXT_PUSH(c);
}
WTEXT_PUSH(val); /* this assumes wchar_t is Unicode */
use_wcs = TRUE;
continue;
}
else if(c == 'U') {
unsigned int val = 0; int i, ext;
Rboolean delim = FALSE;
if((c = xxgetc()) == '{') {
delim = TRUE;
CTEXT_PUSH(c);
} else xxungetc(c);
for(i = 0; i < 8; i++) {
c = xxgetc(); CTEXT_PUSH(c);
if(c >= '0' && c <= '9') ext = c - '0';
else if (c >= 'A' && c <= 'F') ext = c - 'A' + 10;
else if (c >= 'a' && c <= 'f') ext = c - 'a' + 10;
else {
xxungetc(c);
CTEXT_POP();
if (i == 0) { /* was just \U */
*ct = '\0';
PROBLEM "'\\U' used without hex digits in character string starting \"%s\"", currtext
ERROR;
}
break;
}
val = 16*val + ext;
}
if(delim) {
if((c = xxgetc()) != '}') {
PROBLEM "invalid \\U{xxxxxxxx} sequence"
ERROR;
} else CTEXT_PUSH(c);
}
WTEXT_PUSH(val);
use_wcs = TRUE;
continue;
}
else {
switch (c) {
case 'a':
c = '\a';
break;
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'v':
c = '\v';
break;
case '\\':
c = '\\';
break;
case '"':
case '\'':
case ' ':
case '\n':
break;
default:
*ct = '\0';
PROBLEM "'\\%c' is an unrecognized escape in character string starting \"%s\"", c, currtext
ERROR;
}
}
}
}
STEXT_PUSH(c);
if ((unsigned int) c < 0x80) WTEXT_PUSH(c);
STEXT_PUSH('\0');
WTEXT_PUSH(0);
yylval = mkCharLenCE(wcs, wcnt, CE_UTF8); /* include terminator */
if(stext != st0) free(stext);
return(yylval);
}
SEXP
R_checkStringValue()
{
char str[6];
str[0] = '\\';
str[1] = 'u';
str[2] = '1';
str[3] = '4';
str[4] = '0';
str[5] = '5';
return(StringValue(str, 6));
}
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