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#include "ccan_tokenizer.h"
static char *strdup_rng(const char *s, const char *e) {
char *ret = malloc(e-s+1);
memcpy(ret, s, e-s);
ret[e-s] = 0;
return ret;
}
#define MESSAGE_PATH "tokenize/read_cstring/"
//Reads a C string starting at s until quoteChar is found or e is reached
// Returns the pointer to the terminating quote character or e if none was found
char *read_cstring(darray_char *out, const char *s, const char *e, char quoteChar, tok_message_queue *mq) {
const char * const tokstart = s;
const char *p;
int has_endquote=0, has_newlines=0;
//tok_msg_debug(called, s, "Called read_cstring on `%s`", s);
#define append(startptr,endptr) darray_append_items(*out, startptr, (endptr)-(startptr))
#define append_char(theChar) darray_append(*out, theChar)
#define append_zero() do {darray_append(*out, 0); out->size--;} while(0)
p = s;
while (p<e) {
char c = *p++;
if (c == '\\') {
append(s, p-1);
s = p;
if (p >= e) {
append_char('\\');
tok_msg_error(ended_in_backslash, p-1,
"read_cstring input ended in backslash");
break;
}
c = *p++;
if (c>='0' && c<='9') {
unsigned int octal = c-'0';
size_t digit_count = 0;
while (p<e && *p>='0' && *p<='9') {
octal <<= 3;
octal += (*p++) - '0';
if (++digit_count >= 2)
break;
}
if (p<e && *p>='0' && *p<='9') {
tok_msg_info(ambiguous_octal, s-2,
"Octal followed by digit");
}
if (octal > 0xFF) {
tok_msg_warn(octal_overflow, s-2,
"Octal out of range");
}
c = octal;
} else {
switch (c) {
case 'x': {
size_t digit_count = 0;
size_t zero_count = 0;
unsigned int hex = 0;
while (p<e && *p=='0') p++, zero_count++;
for (;p<e;digit_count++) {
c = *p++;
if (c>='0' && c<='9')
c -= '0';
else if (c>='A' && c<='F')
c -= 'A'-10;
else if (c>='a' && c<='f')
c -= 'a'-10;
else {
p--;
break;
}
hex <<= 4;
hex += c;
}
if (zero_count+digit_count > 2) {
char *hex_string = strdup_rng(s-2, p);
tok_msg_warn(ambiguous_hex, s-2,
"Hex escape '%s' is ambiguous", hex_string);
if (digit_count > 2)
tok_msg_warn(hex_overflow, s-2,
"Hex escape '%s' out of range", hex_string);
free(hex_string);
}
c = hex & 0xFF;
} break;
case 'a':
c=0x7;
break;
case 'b':
c=0x8;
break;
case 'e':
c=0x1B;
break;
case 'f':
c=0xC;
break;
case 'n':
c=0xA;
break;
case 'r':
c=0xD;
break;
case 't':
c=0x9;
break;
case 'v':
c=0xB;
break;
case '\\':
break;
default:
if (c == quoteChar)
break;
if (c=='\'' && quoteChar=='"') {
/* tok_msg_info(escaped_single_quote, s-2,
"Single quote characters need not be escaped within double quotes"); */
break;
}
if (c=='"' && quoteChar=='\'') {
/* tok_msg_info(escaped_double_quote, s-2,
"Double quote characters need not be escaped within single quotes"); */
break;
}
if (c=='?') // \? is needed in some situations to avoid building a trigraph
break;
tok_msg_warn(unknown_escape, s-2,
"Unknown escape sequence '\\%c'", c);
break;
}
}
s = p;
append_char(c);
} else if (c == quoteChar) {
p--;
has_endquote = 1;
break;
} else if (creturn(c)) {
has_newlines = 1;
}
}
append(s, p);
append_zero();
if (!has_endquote) {
tok_msg_error(missing_endquote, tokstart,
"Missing endquote on %s literal",
quoteChar=='\'' ? "character" : "string");
} else if (has_newlines) {
tok_msg_warn(quote_newlines, tokstart,
"%s literal contains newline character(s)",
quoteChar=='\'' ? "Character" : "String");
}
return (char*)p;
#undef append
#undef append_char
#undef append_zero
}
#undef MESSAGE_PATH
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