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#include <string.h>
#include "target.h"
#include "lib.h"
#include "allocate.h"
#include "token.h"
#include "expression.h"
#include "char.h"
static const char *parse_escape(const char *p, unsigned *val, const char *end, int bits, struct position pos)
{
unsigned c = *p++;
unsigned d;
if (c != '\\') {
*val = c;
return p;
}
c = *p++;
switch (c) {
case 'a': c = '\a'; break;
case 'b': c = '\b'; break;
case 't': c = '\t'; break;
case 'n': c = '\n'; break;
case 'v': c = '\v'; break;
case 'f': c = '\f'; break;
case 'r': c = '\r'; break;
case 'e': c = '\e'; break;
case 'x': {
unsigned mask = -(1U << (bits - 4));
for (c = 0; p < end; c = (c << 4) + d) {
d = hexval(*p);
if (d > 16)
break;
p++;
if (c & mask) {
warning(pos,
"hex escape sequence out of range");
mask = 0;
}
}
break;
}
case '0'...'7': {
if (p + 2 < end)
end = p + 2;
c -= '0';
while (p < end && (d = *p - '0') < 8) {
c = (c << 3) + d;
p++;
}
if ((c & 0400) && bits < 9)
warning(pos,
"octal escape sequence out of range");
break;
}
default: /* everything else is left as is */
warning(pos, "unknown escape sequence: '\\%c'", c);
break;
case '\\':
case '\'':
case '"':
case '?':
break; /* those are legal, so no warnings */
}
*val = c & ~((~0U << (bits - 1)) << 1);
return p;
}
void get_char_constant(struct token *token, unsigned long long *val)
{
const char *p = token->embedded, *end;
unsigned v;
int type = token_type(token);
switch (type) {
case TOKEN_CHAR:
case TOKEN_WIDE_CHAR:
p = token->string->data;
end = p + token->string->length - 1;
if (end == p) {
sparse_error(token->pos, "empty character constant");
*val = 0;
return;
}
break;
case TOKEN_CHAR_EMBEDDED_0 ... TOKEN_CHAR_EMBEDDED_3:
end = p + type - TOKEN_CHAR;
break;
default:
end = p + type - TOKEN_WIDE_CHAR;
}
p = parse_escape(p, &v, end,
type < TOKEN_WIDE_CHAR ? bits_in_char : wchar_ctype->bit_size, token->pos);
if (p != end)
warning(token->pos,
"multi-character character constant");
*val = v;
}
struct token *get_string_constant(struct token *token, struct expression *expr)
{
struct string *string = token->string;
struct token *next = token->next, *done = NULL;
int stringtype = token_type(token);
int is_wide = stringtype == TOKEN_WIDE_STRING;
static char buffer[MAX_STRING];
int len = 0;
int bits;
int esc_count = 0;
while (!done) {
switch (token_type(next)) {
case TOKEN_WIDE_STRING:
is_wide = 1;
case TOKEN_STRING:
next = next->next;
break;
default:
done = next;
}
}
bits = is_wide ? wchar_ctype->bit_size: bits_in_char;
while (token != done) {
unsigned v;
const char *p = token->string->data;
const char *end = p + token->string->length - 1;
while (p < end) {
if (*p == '\\')
esc_count++;
p = parse_escape(p, &v, end, bits, token->pos);
if (len < MAX_STRING)
buffer[len] = v;
len++;
}
token = token->next;
}
if (len > MAX_STRING) {
warning(token->pos, "trying to concatenate %d-character string (%d bytes max)", len, MAX_STRING);
len = MAX_STRING;
}
if (esc_count || len >= string->length) {
if (string->immutable || len >= string->length) /* can't cannibalize */
string = __alloc_string(len+1);
string->length = len+1;
memcpy(string->data, buffer, len);
string->data[len] = '\0';
}
expr->string = string;
expr->wide = is_wide;
return token;
}
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